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WO2001040113A1 - Procede et appareil de traitement et de regeneration de solutions aqueuses usees de soude caustique provenant de la purification et du nettoyage de produits petroliferes - Google Patents

Procede et appareil de traitement et de regeneration de solutions aqueuses usees de soude caustique provenant de la purification et du nettoyage de produits petroliferes Download PDF

Info

Publication number
WO2001040113A1
WO2001040113A1 PCT/IT2000/000474 IT0000474W WO0140113A1 WO 2001040113 A1 WO2001040113 A1 WO 2001040113A1 IT 0000474 W IT0000474 W IT 0000474W WO 0140113 A1 WO0140113 A1 WO 0140113A1
Authority
WO
WIPO (PCT)
Prior art keywords
caustic soda
solution
spent
optionally
cleansing
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/IT2000/000474
Other languages
English (en)
Inventor
Aldo Imerito
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.)
Ecotec SRL
Original Assignee
Ecotec SRL
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 Ecotec SRL filed Critical Ecotec SRL
Priority to AU18861/01A priority Critical patent/AU1886101A/en
Publication of WO2001040113A1 publication Critical patent/WO2001040113A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
    • C01D1/00—Oxides or hydroxides of sodium, potassium or alkali metals in general
    • C01D1/04—Hydroxides
    • C01D1/28—Purification; Separation
    • 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
    • C10G19/00—Refining hydrocarbon oils in the absence of hydrogen, by alkaline treatment
    • C10G19/08—Recovery of used refining agents

Definitions

  • the present invention relates to the field of processes for treating and regenerating spent aqueous solutions of caustic soda from purification and cleansing of petroliferous products ( «spent caustics») .
  • the present invention aims instead at lessening the problems associated to the pollution and to the running expenses for attaining purified spent solutions that be environmentally compliant according to the current strict norms on environmental emissions.
  • the subject- of the present invention is a process for treating and regenerating spent aqueous solutions of caustic soda from purification and cleansing of petroliferous products, comprising the following steps in combination:
  • the quantity of ozone may be comprised in the range 0.5-50 kg per cubic meter of the untreated solution of caustic soda.
  • the invention further relates to the regenerated solution of caustic soda, obtained with the abovementioned process, exhibiting a pH >14.
  • a further subject of the present invention is an apparatus suitable for carrying out the abovedisclosed process, comprising in combination: optionally, means for deoiling; optionally, means for an initial filtering; a chamber for ozonizing the resulting solution with means for feeding the ozone, means for feeding the solution to be treated, and means for the post-ozonization discharge of the solution; means for a final filtering; and means for recovering the regenerated solution of caustic soda.
  • the deoiling means may be PPI-CPI apparatuses.
  • the initial filtering means may be metallic hydroxide-packed filter beds.
  • the final filtering means may be membrane filters.
  • the deoiling is aimed at eliminating the dissolved and/or suspended hydrocarbon component .
  • the initial filtering is aimed at partially removing the sulfurated organic compounds, of more problematical oxidative demolition, whose post-treatment permanence inside the final caustic soda would tend to decrease the free caustic soda level.
  • the ozonization has the function of breaking up the aromatic component (phenol-phenolates-benzene) and of oxidizing the inorganic reducing species (sulfides- sulfites) to sulfur and the organic sulfurilated species to lower hydrocarbons and sulfur.
  • the final filtration is aimed at eliminating: a) inorganic pulps (carbonates) and organic breaks (polymers, gums, higher hydrocarbons) induced at the operating stage; b) TSS (carbonates-sulfates) ; and c) residual turbidity from the ozonizing process, essentially consisting of elementary sulfur m a colloidal matrix, which might jeopardize the subsequent reuse, even for mere industrial ends like acidic streams neutralization, column head water treating, liquid sealing and so on.
  • the end species are: hydroxyl (OH " ), sulfur, Sodium (Na + ) and possible weak acids.
  • OH " hydroxyl
  • sulfur sulfur
  • Na + Sodium
  • possible weak acids a very sharp drop both in the organic and inorganic sulfides as well as in aromatics (phenols) and hydrocarbons is highlighted.
  • a spent caustic soda aqueous solution from a petroliferous plant, to be subjected to the process for treating and regenerating according to the invention, when chemically analyzed exhibits the following composition expressed in ppm:
  • the regenerated solution can be reused for the purification and cleansing of petroliferous products.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Materials Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

L'invention concerne un procédé de traitement et de régénération de solutions aqueuses usées de soude caustique provenant de la purification et du nettoyage de produits pétrolifères. Le procédé consiste : à éventuellement dégraisser cette solution usée de soude caustique, à éventuellement filtrer de façon initiale la solution, éventuellement dégraissée, à oxyder cette solution, éventuellement dégraissée et filtrée, avec de l'ozone en quantité au moins stoechiométrique par rapport aux polluants à éliminer, à finalement filtrer la solution résultant de l'ozonisation, et à récupérer et réutiliser la solution de soude caustique ainsi régénérée et clarifiée, avec un pH > 14 et un titre de soude caustique libre équivalant à deux fois celui de la solution de soude caustique usée initiale. L'invention concerne également la solution régénérée de soude caustique obtenue au moyen du procédé susmentionné, et un appareil permettant d'exécuter ledit procédé.
PCT/IT2000/000474 1999-11-30 2000-11-23 Procede et appareil de traitement et de regeneration de solutions aqueuses usees de soude caustique provenant de la purification et du nettoyage de produits petroliferes Ceased WO2001040113A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU18861/01A AU1886101A (en) 1999-11-30 2000-11-23 Process and apparatus for treating and regenerating spent aqueous solutions of caustic soda from purification and cleansing of petroliferous products

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1999RM000738A IT1307285B1 (it) 1999-11-30 1999-11-30 Trattamento disinquinante e rigenerazione di soluzioni acquose di sodacaustica esauste da depurazione e lavaggio di prodotti petroliferi, ed
ITRM99A000738 1999-11-30

Publications (1)

Publication Number Publication Date
WO2001040113A1 true WO2001040113A1 (fr) 2001-06-07

Family

ID=11407080

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT2000/000474 Ceased WO2001040113A1 (fr) 1999-11-30 2000-11-23 Procede et appareil de traitement et de regeneration de solutions aqueuses usees de soude caustique provenant de la purification et du nettoyage de produits petroliferes

Country Status (3)

Country Link
AU (1) AU1886101A (fr)
IT (1) IT1307285B1 (fr)
WO (1) WO2001040113A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7713399B2 (en) 2005-05-12 2010-05-11 Saudi Arabian Oil Company Process for treating a sulfur-containing spent caustic refinery stream using a membrane electrolyzer powered by a fuel cell

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU660694A1 (ru) * 1973-10-22 1979-05-05 Plotnikov Nikolaj Способ очистки сточных вод от эмульгированных нефтепродутов
US4417986A (en) * 1981-03-13 1983-11-29 Mobil Oil Corporation Process for reducing the chemical oxygen demand of spent alkaline reagents
EP0509964A1 (fr) * 1991-02-20 1992-10-21 ECOTEC S.r.l. Procédé pour le traitement de solutions aqueuses usées d'alcali caustique usée pour la purification et le lavage de produits pétrolières
US5268104A (en) * 1992-07-09 1993-12-07 Stone & Webster Engineering, Corp. Process for treating and regenerating spent caustic

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU660694A1 (ru) * 1973-10-22 1979-05-05 Plotnikov Nikolaj Способ очистки сточных вод от эмульгированных нефтепродутов
US4417986A (en) * 1981-03-13 1983-11-29 Mobil Oil Corporation Process for reducing the chemical oxygen demand of spent alkaline reagents
EP0509964A1 (fr) * 1991-02-20 1992-10-21 ECOTEC S.r.l. Procédé pour le traitement de solutions aqueuses usées d'alcali caustique usée pour la purification et le lavage de produits pétrolières
US5268104A (en) * 1992-07-09 1993-12-07 Stone & Webster Engineering, Corp. Process for treating and regenerating spent caustic

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 198003, Derwent World Patents Index; Class J01, AN 1980-04743C, XP002162844 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7713399B2 (en) 2005-05-12 2010-05-11 Saudi Arabian Oil Company Process for treating a sulfur-containing spent caustic refinery stream using a membrane electrolyzer powered by a fuel cell

Also Published As

Publication number Publication date
ITRM990738A0 (it) 1999-12-02
AU1886101A (en) 2001-06-12
IT1307285B1 (it) 2001-10-30
ITRM990738A1 (it) 2001-05-30

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