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WO2016016849A1 - Procédés de passivation d'une cuve en acier inoxydable - Google Patents

Procédés de passivation d'une cuve en acier inoxydable Download PDF

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Publication number
WO2016016849A1
WO2016016849A1 PCT/IB2015/055789 IB2015055789W WO2016016849A1 WO 2016016849 A1 WO2016016849 A1 WO 2016016849A1 IB 2015055789 W IB2015055789 W IB 2015055789W WO 2016016849 A1 WO2016016849 A1 WO 2016016849A1
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WO
WIPO (PCT)
Prior art keywords
tank
liquid
acid
liquid acid
ppm
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IB2015/055789
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English (en)
Inventor
Avtandil Khalil Oglu BAIRAMOV
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SABIC Global Technologies BV
Original Assignee
SABIC Global Technologies BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SABIC Global Technologies BV filed Critical SABIC Global Technologies BV
Publication of WO2016016849A1 publication Critical patent/WO2016016849A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G75/00—Inhibiting corrosion or fouling in apparatus for treatment or conversion of hydrocarbon oils, in general
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
    • C23F11/04—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in markedly acid liquids
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F15/00—Other methods of preventing corrosion or incrustation

Definitions

  • the present invention relates to methods for passivation of stainless steel tanks to provide improved corrosion resistance and resistance to discoloration of the tank contents.
  • Stainless steels are widely used as materials of construction (MOC) for storage and export tanks, for example, storage and export of acetic acid. These tanks range in size up to tens of thousands of metric tons (T) and are often used for long term storage. Although stainless steel alloys have protective layers to increase the corrosion resistance of the steel, environmental and operational factors can alter the effective corrosion resistance leading to corrosion.
  • Iron content in the final stored product can be very critical and strongly limited for both reagent grade and commodity grade products. While the final iron content can depend on the corrosion rate of the materials used for constructing the storage and export tanks, increase in iron content above lower specification limits can lead to unacceptable decrease in the quality of the final product, which includes, among other things, an undesirable yellowing of the final product color. In this aspect, out of specification final products result in huge economical losses and even unplanned plant shutdown to identify and correct the cause of the problem.
  • the invention relates to a method of passivation of a stainless steel tank comprising the steps of: a) providing an acid or acid anhydride stainless steel tank containing liquid acid or liquid acid anhydride comprising a nitrogen line that exits at the bottom of the tank, wherein the bottom of the tank is opposite the headspace of the tank, and b) flowing nitrogen through the nitrogen line to the bottom of the tank and into the liquid acid or liquid acid anhydride, wherein the nitrogen contains at least 3 ppm oxygen, thereby passivating the stainless steel tank.
  • the invention in another aspect, relates to a method of preparing a system for passivation of a stainless steel tank, comprising the steps of: a) providing an acid or acid anhydride stainless steel tank comprising a nitrogen line that exits in the tank headspace for blanketing the headspace with nitrogen, wherein the nitrogen in the nitrogen line contains at least 3 ppm oxygen, and b) retrofitting the nitrogen line so that the exit of the nitrogen line is at the bottom of the tank, wherein the bottom of the tank is opposite the headspace of the tank.
  • the invention relates to a liquid acid or liquid acid anhydride solution contained in a stainless steel tank; wherein the liquid acid or liquid acid anhydride solution comprises less than about 1 ppm iron after about 6 months of storage in the tank.
  • Ranges can be expressed herein as from one particular value, and/or to another particular value. When such a range is expressed, another aspect includes from the one particular value and/or to the other particular value. Similarly, when values are expressed as approximations, by use of the antecedent 'about,' it will be understood that the particular value forms another aspect. It will be further understood that the endpoints of each of the ranges are significant both in relation to the other endpoint, and independently of the other endpoint. It is also understood that there are a number of values disclosed herein, and that each value is also herein disclosed as "about” that particular value in addition to the value itself. For example, if the value "10" is disclosed, then “about 10" is also disclosed. It is also understood that each unit between two particular units are also disclosed. For example, if 10 and 15 are disclosed, then 11, 12, 13, and 14 are also disclosed.
  • the terms "about” and “at or about” mean that the amount or value in question can be the value designated, or some other value approximately or about the same as the value designated.
  • the term is intended to convey that similar values promote equivalent results or effects recited in the claims. That is, it is understood that amounts, sizes, formulations, parameters, and other quantities and characteristics are not and need not be exact, but can be approximate and/or larger or smaller, as desired, reflecting tolerances, conversion factors, rounding off, measurement error and the like, and other factors known to those of skill in the art.
  • an amount, size, formulation, parameter or other quantity or characteristic is “about” or “approximate” whether or not expressly stated to be such. It is understood that where "about” is used before a quantitative value, the parameter also includes the specific quantitative value itself, unless specifically stated otherwise.
  • the terms “optional” or “optionally” means that the subsequently described event or circumstance can or cannot occur, and that the description includes instances where said event or circumstance occurs and instances where it does not.
  • the phrase “optionally recirculated acid” means that the acid can or cannot be recirculated and that the description includes both recirculated and unrecirculated acid.
  • the term or phrase "effective,” “effective amount,” or “conditions effective to” refers to such amount or condition that is capable of performing the function or property for which an effective amount is expressed. As will be pointed out below, the exact amount or particular condition required will vary from one aspect to another, depending on recognized variables such as the materials employed and the processing conditions observed. Thus, it is not always possible to specify an exact “effective amount” or “condition effective to.” However, it should be understood that an appropriate effective amount will be readily determined by one of ordinary skill in the art using only routine experimentation.
  • X and Y are present at a weight ratio of 2:5, and are present in such ratio regardless of whether additional components are contained in the compound.
  • a weight percent ("wt%") of a component is based on the total weight of the formulation or composition in which the component is included. For example if a particular element or component in a composition or article is said to have 8% by weight, it is understood that this percentage is relative to a total compositional percentage of 100% by weight.
  • the present invention relates to a method of preparing a system for passivation of a stainless steel tank comprising: a) providing an acid or acid anhydride stainless steel tank comprising a nitrogen line that exits in the tank headspace for blanketing the headspace with nitrogen, whereby the nitrogen in the nitrogen line contains at least 3 parts per million (ppm) oxygen, and b) retrofitting the nitrogen line so that the exit of the nitrogen line is at the bottom of the tank, wherein the bottom of the tank is opposite the headspace of the tank.
  • ppm parts per million
  • the present invention comprises at least one tank or vessel.
  • the tank comprises stainless steel.
  • the stainless steel can comprise any desired stainless steel.
  • the stainless steel can comprise a 300 series stainless steel.
  • the stainless steel is a stainless steel selected from 304, 316, 347, 321, or 310.
  • the stainless steel is 304L or 316L.
  • the tank is for storage or export.
  • the tank is for storage, for example, a liquid product.
  • the tank is for export.
  • the tank is for storage or export of concentrated acid.
  • the acid can comprise any desired organic acid requiring limitation on iron content.
  • the acid is acetic, formic, propionic, or acrylic acid.
  • the acid is acetic acid.
  • the tank is for storage or export of an acid anhydride.
  • the acid anhydride can comprise any desired acid anhydride requiring limitation on iron content.
  • the acid anhydride is acetic anhydride.
  • the tank comprises at least one feed or line.
  • the line comprises stainless steel.
  • the stainless steel can comprise any desired stainless steel.
  • the stainless steel is SS316L or SS317L, or higher.
  • the line is a gas line, for example, to deliver a gas into the tank.
  • the line is a nitrogen line.
  • the line exits or terminates in the tank headspace for blanketing the headspace with a gas.
  • the line is a nitrogen line that exits or terminates in the tank headspace for blanketing the headspace with nitrogen. Such an exit in the headspace will need to be retrofitted to exit at the bottom of the tank.
  • the line exits or terminates at the bottom of the tank, for example, wherein the bottom of the tank is opposite the headspace of the tank.
  • the line is retrofitted such that the exit or termination of the line is at the bottom of the tank, wherein the bottom of the tank is opposite the headspace of the tank.
  • the tank comprises a nitrogen line that exits or terminates at the bottom of the tank, wherein the bottom of the tank is opposite the headspace of the tank.
  • the tank comprises a retrofitted nitrogen line such that the exit or termination of the nitrogen line is at the bottom of the tank, wherein the bottom of the tank is opposite the headspace of the tank.
  • the line flows or delivers a gas through the line and into the tank.
  • the line flows or delivers a gas through the line and directly into the contents of the tank.
  • the line is a nitrogen line that delivers nitrogen through the line into the tank.
  • the nitrogen line flows or delivers nitrogen through the nitrogen line to the bottom of the tank and into liquid acid or liquid acid anhydride.
  • the methods comprise delivering or flowing a gas through the line and into the tank.
  • the methods comprise delivering or flowing a gas through the line and directly into the contents of the tank.
  • nitrogen is flowed or delivered through the line into the tank.
  • nitrogen is flowed or delivered through the nitrogen line to the bottom of the tank and into liquid acid or liquid acid anhydride.
  • nitrogen is flowed or delivered through the nitrogen line into liquid acid or liquid acid anhydride, thereby passivating the stainless steel tank.
  • the gas comprises nitrogen.
  • the nitrogen comprises at least 3 ppm oxygen, including further exemplary amounts of at least 4, at least 5, at least 6, at least 7, at least 8, at least 9, and at least 10 ppm oxygen.
  • the nitrogen comprises from about 3 ppm to about 10 ppm oxygen, for example, from about 5 ppm to about 10 ppm oxygen.
  • the liquid acid or liquid acid anhydride can further comprise an oxidizing agent.
  • the oxidizing agent can comprise a chromate, nitrite, molybdate, permanganate, or the like.
  • the methods comprise providing an acid or acid anhydride stainless steel tank containing liquid acid or liquid acid anhydride.
  • the liquid acid or liquid acid anhydride in the tank is static.
  • the liquid acid or liquid acid anhydride is periodically circulated or stirred, for example, to increase oxygen distribution.
  • circulating can comprise stirring or agitating the tank to cause mixing of the tank contents, and distribution of the oxygen.
  • the storage tank capacity can be any desired size or volume. In a further aspect, the storage tank capacity is about 5,000T. In a still further aspect, the storage tank capacity is less than about 5,000T. In a yet further aspect, the storage tank capacity is greater than about 5,000T.
  • the methods involve storage conditions effective to prevent corrosion or contamination of the tank contents.
  • the storage conditions effective can comprise any desired storage conditions and will depend on a number of variable, including, but not limited to plant productivity and shipping schedules.
  • the external tank temperature can comprise ambient temperature.
  • the internal tank temperature is a temperature effective to prevent crystal formation.
  • the internal tank temperature is greater than about 16 °C.
  • the internal tank temperature can be greater than about 16.6 °C, for example, greater than about 17 °C, greater than about 20 °C, or greater than about 25 °C.
  • the time “t” comprises the total storage time.
  • the time “t” can be any desired time period.
  • the time “t” can be 1 minute, 1 hour, 1 day, 1 month, 6 months, 1 year, or 2 years, or more.
  • the time “t” can be from about 1 month to about 6 months and all subranges there between.
  • the present methods for passivating of a stainless steel tank can maintain the iron content in the tank at or below a predefined standard concentration.
  • the predefined standard concentration can be an acceptable value or range, and is sometimes referred to as the lower specification limit (LSL).
  • LSL lower specification limit
  • Final products below or within the predefined standard concentration meet specification and are acceptable.
  • Final products falling above or outside of the predefined standard concentration are out of specification and are unacceptable, and generally result in out of specification material.
  • the specific predefined standard concentration depends on the desired product properties, for example, chemical and physical properties, and can be determined by one skilled in the art.
  • the predefined standard concentration can comprise a concentration of a component, for example, a maximum concentration of a by-product or impurity.
  • the predefined standard concentration can comprise the content of an impurity, for example, the iron content of acetic acid.
  • the predefined standard concentration is the iron content in the liquid acid or liquid acid anhydride after a time "t". In a further aspect, the predefined standard concentration is the iron content in the liquid acid or liquid acid anhydride after from about 5 months to about 6 months can be from about 1 to about 5 ppm iron. In a still further aspect, the iron content in the liquid acid or liquid acid anhydride after from about 5 months to about 6 months can be from about 1 to about 2 ppm iron.
  • the iron content in the liquid acid or liquid acid anhydride can be determined by any desired analytical method.
  • the iron content in the liquid acid or liquid acid anhydride is determined by laboratory analysis using atomic absorption spectroscopy.
  • the method can be offline or online.
  • the method can be online to provide real-time data that can be used make adjustments to the storage tank and contents.
  • the methods can provide decreased iron accumulation in the liquid acid or liquid acid anhydride compared to a substantially identical reference method that does not flow nitrogen into the liquid acid, wherein the nitrogen contains at least 3 ppm oxygen.
  • the present methods exhibit a corrosion rate of less than about 0.025 mm/y.
  • the present methods can maintain the iron content below a predefined standard concentration.
  • the present methods exhibit an iron content in the liquid acid or liquid acid anhydride of less than about 2 ppm after about 5 months of storage.
  • the present methods exhibit an iron content in the liquid acid or liquid acid anhydride of less than about 1 ppm after about 5 months.
  • the present methods exhibit an iron content in the liquid acid or liquid acid anhydride of less than about 2 ppm after about 6 months.
  • the present methods exhibit an iron content in the liquid acid or liquid acid anhydride of less than about 1 ppm after about 6 months.
  • the present disclosure also relates to a liquid acid or liquid acid anhydride solution contained in a stainless steel tank.
  • the liquid acid or liquid acid anhydride solution comprises less than about 5 ppm iron after about 6 months of storage in the tank.
  • the liquid acid or liquid acid anhydride solution comprises less than about 2 ppm iron after about 6 months of storage in the tank.
  • the liquid acid or liquid acid anhydride solution comprises less than about 1 ppm iron after about 6 months of storage in the tank.
  • nitrogen gas comprising at least about 3 ppm oxygen is bubbled through the liquid solution.
  • the liquid is acetic, formic, propionic, or acrylic acid.
  • the liquid is acetic anhydride.
  • the present invention pertains to and includes at least the following aspects.
  • a method of passivation of a stainless steel tank comprising the steps of: a) providing an acid or acid anhydride stainless steel tank containing liquid acid or liquid acid anhydride comprising a nitrogen line that exits at the bottom of the tank, wherein the bottom of the tank is opposite the headspace of the tank, and b) flowing nitrogen through the nitrogen line to the bottom of the tank and into the liquid acid or liquid acid anhydride, wherein the nitrogen contains at least 3 ppm oxygen, thereby passivating the stainless steel tank.
  • Aspect 2 The method of any preceding aspect, wherein the liquid is a concentrated acid.
  • Aspect 3 The method of any preceding aspect, wherein the liquid is an organic acid.
  • Aspect 4 The method of any preceding aspect, wherein the liquid is acetic, formic, propionic, or acrylic acid.
  • Aspect 5 The method of any preceding aspect, wherein the liquid is acetic acid.
  • Aspect 6 The method of any preceding aspect, wherein the liquid is acetic anhydride.
  • Aspect 7 The method of any preceding aspect, wherein the tank is a storage or export tank.
  • Aspect 8 The method of any preceding aspect, wherein the tank is for storage of acetic acid or acetic anhydride.
  • Aspect 9 The method of any preceding aspect, wherein the oxygen content is at least 5 ppm.
  • Aspect 10 The method of any preceding aspect, wherein the oxygen content is at least 7 ppm.
  • Aspect 11 The method of any preceding aspect, wherein the oxygen content is at least 9 ppm.
  • Aspect 12 The method of any preceding aspect, wherein the oxygen content is at least 10 ppm.
  • Aspect 13 The method of any preceding aspect, wherein the liquid acid or acid anhydride in the tank is static.
  • Aspect 14 The method of any preceding aspect, wherein the liquid acid or liquid acid anhydride in the tank is periodically circulated to increase the oxygen distribution.
  • a method of preparing a system for passivation of a stainless steel tank comprising the steps of: a) providing an acid or acid anhydride stainless steel tank comprising a nitrogen line that exits in the tank headspace for blanketing the headspace with nitrogen, wherein the nitrogen in the nitrogen line contains at least 3 ppm oxygen, and b) retrofitting the nitrogen line so that the exit of the nitrogen line is at the bottom of the tank, wherein the bottom of the tank is opposite the headspace of the tank.
  • Aspect 16 The method of aspect 15, further comprising the step of introducing a liquid acid or liquid acid anhydride into the tank.
  • Aspect 17 The method of aspect 16, wherein the liquid acid or liquid acid anhydride is introduced into the tank after retrofitting the nitrogen line.
  • Aspect 18 The method of aspect 16 or 17, wherein the liquid is a concentrated acid.
  • Aspect 19 The method of aspects 16-18, wherein the liquid is an organic acid.
  • Aspect 20 The method of aspects 16-19, wherein the liquid is acetic, formic, propionic, or acrylic acid.
  • Aspect 21 The method of aspects 16-20, wherein the liquid is acetic acid.
  • Aspect 22 The method of aspects 16-21, wherein the liquid is acetic anhydride.
  • Aspect 23 The method of aspects 15-22, wherein the tank is a storage or export tank.
  • Aspect 24 The method of aspects 15-23, wherein the tank is for storage of acetic acid or acetic anhydride.
  • Aspect 25 The method of aspects 15-24, wherein the oxygen content is at least 5 ppm.
  • Aspect 26 The method of aspects 15-25, wherein the oxygen content is at least 7 ppm.
  • Aspect 27 The method of aspects 15-26, wherein the oxygen content is at least 9 ppm.
  • Aspect 28 The method of aspects 15-27, wherein the oxygen content is at least 10 ppm.
  • Aspect 29 The method of aspects 16-28, wherein the liquid acid or liquid acid anhydride in the tank is static.
  • Aspect 30 The method of aspects 16-29, wherein the liquid acid or liquid acid anhydride in the tank is periodically circulated to increase the oxygen distribution.
  • Aspect 31 The method of any preceding aspect, further comprising an iron content in the liquid acid or liquid acid anhydride after from about 5 months to about 6 months of about 1 to about 5 ppm iron, preferably about 1 to about 2 ppm iron.
  • Aspect 33 The liquid acid or liquid acid anhydride solution of aspect 32, wherein nitrogen gas comprising at least about 3 ppm oxygen is bubbled through the solution.
  • Aspect 34 The liquid acid or liquid acid anhydride solution of aspect 32, wherein the liquid is acetic, formic, propionic, or acrylic acid.
  • Aspect 35 The liquid acid or liquid acid anhydride solution of aspect 32, wherein the liquid is acetic anhydride.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Treatment Of Metals (AREA)

Abstract

L'invention concerne des procédés de passivation d'une cuve en acier inoxydable. Le présent abrégé est proposé à titre d'outil d'exploration à des fins de recherche dans cette technique particulière et n'est pas destiné à limiter la présente invention.
PCT/IB2015/055789 2014-07-30 2015-07-30 Procédés de passivation d'une cuve en acier inoxydable Ceased WO2016016849A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201462030775P 2014-07-30 2014-07-30
US62/030,775 2014-07-30

Publications (1)

Publication Number Publication Date
WO2016016849A1 true WO2016016849A1 (fr) 2016-02-04

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Application Number Title Priority Date Filing Date
PCT/IB2015/055789 Ceased WO2016016849A1 (fr) 2014-07-30 2015-07-30 Procédés de passivation d'une cuve en acier inoxydable

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2907699A (en) * 1953-10-31 1959-10-06 Distillers Co Yeast Ltd Process for resisting corrosion by aliphatic acids
US3960671A (en) * 1974-06-17 1976-06-01 Rohm And Haas Company Quinones as corrosion inhibitor in distilling alkanoic acids

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2907699A (en) * 1953-10-31 1959-10-06 Distillers Co Yeast Ltd Process for resisting corrosion by aliphatic acids
US3960671A (en) * 1974-06-17 1976-06-01 Rohm And Haas Company Quinones as corrosion inhibitor in distilling alkanoic acids

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