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WO1998058737A1 - Procede de regeneration de resine echangeuse d'ions - Google Patents

Procede de regeneration de resine echangeuse d'ions Download PDF

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Publication number
WO1998058737A1
WO1998058737A1 PCT/EP1998/003843 EP9803843W WO9858737A1 WO 1998058737 A1 WO1998058737 A1 WO 1998058737A1 EP 9803843 W EP9803843 W EP 9803843W WO 9858737 A1 WO9858737 A1 WO 9858737A1
Authority
WO
WIPO (PCT)
Prior art keywords
screen
seeding particles
ion exchange
exchange resin
particles
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/EP1998/003843
Other languages
English (en)
Inventor
Heinz Werner Gussmann
John Anthony Du Plessis
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.)
CHEMICAL EFFLUENT TREATMENT PROCESS Pty Ltd
Original Assignee
CHEMICAL EFFLUENT TREATMENT PROCESS Pty Ltd
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 CHEMICAL EFFLUENT TREATMENT PROCESS Pty Ltd filed Critical CHEMICAL EFFLUENT TREATMENT PROCESS Pty Ltd
Priority to AU87286/98A priority Critical patent/AU8728698A/en
Publication of WO1998058737A1 publication Critical patent/WO1998058737A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J49/00—Regeneration or reactivation of ion-exchangers; Apparatus therefor
    • B01J49/60—Cleaning or rinsing ion-exchange beds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J49/00—Regeneration or reactivation of ion-exchangers; Apparatus therefor
    • B01J49/10—Regeneration or reactivation of ion-exchangers; Apparatus therefor of moving beds

Definitions

  • THIS invention relates to a process for regenerating ion exchange resin and to a method of separating ion exchange resin beads from seeding particles carrying an insoluble regeneration product.
  • Ion exchange resin beads are commonly used for selective removal of dissolved mineral constituents from water. Certain of these dissolved mineral constituents, whether in the form of cations or anions, are particularly undesirable. For example, calcium and magnesium ions increase the "hardness" of the water and sulphate ions contribute to corrosion and scaling problems in industrial applications. These ions are commonly found in water extracted from mining operations, making disposal of this water problematical.
  • Ion exchange resin beads are used selectively to absorb cations or anions onto the resin beads and in so doing become progressively loaded with contaminant ions. Regeneration of these resin beads therefore becomes necessary in order to remove the contaminant ions from the resin.
  • regeneration is effected by bringing the resin into contact with a regenerating liquor.
  • This regenerating liquor may be an aqueous solution of Hydrochloric acid or sodium Hydroxide, depending on the type of resin being treated.
  • a typical regeneration reaction involving the use of sulphuric acid is set out below:
  • R-Ca represents a cation resin loaded with calcium ions
  • H 2 S0 4 (aq) represents an aqueous solution of sulphuric acid which is used as the regenerating agent
  • R-H 2 represents the regenerated resin
  • CaS0 4 represents calcium sulphate or CaS0 4 . 2 H 2 0
  • the calcium sulphate has a low solubility in water and as a result precipitates from the solution in the form of small hydrated calcium sulphate particles. These particles tend to precipitate onto the surface of the resin thereby rendering the resin at least partially ineffective for further cation removal.
  • R-S0 4 represents an anionic resin loaded with sulphate ions
  • Ca (OH) 2 (aq) represents an aqueous solution of calcium hydroxide or lime which is used as the regenerating liquor;
  • R-(OH) 2 represents the regenerated resin
  • CaS0 4 represents calcium sulphate or gypsum.
  • the problem of the precipitation of the calcium sulphate onto the resin beads has been counteracted by the inclusion of small seeding particles of insoluble regeneration product into the solution before the regeneration procedure is commenced. It has been found that by the introduction of the seeding particles, the calcium sulphate preferentially precipitates onto the seeding particles rather than onto the resin. The difficulty then follows in separating the seeding particles from the resin beads.
  • a process for regenerating ion exchange resin including contaminant ions comprising the steps of:
  • the separating zone includes an impeller which is rotated to draw the liquid and entrained solid particles through the screen.
  • the liquid is passed upwardly through the separating zone to form a fluidised bed comprising the resin beads and the seeding particles.
  • the screen is typically arranged in the form of an open topped cylindrical screen extending vertically into the fluidised bed.
  • the insoluble regeneration product is calcium sulphate.
  • a third aspect of the invention there is provided a method of separating regenerated ion exchange resin beads from seeding particles carrying an insoluble regeneration product, the method comprising the steps of:
  • Figure 1 shows a schematic flow diagram of a regeneration process according to the invention.
  • Figure 2 shows a diagrammatic representation of a cross section through the separation vessel depicted in Figure 1.
  • the regeneration apparatus depicted in Figure 1 includes a reaction vessel 10 and a separation vessel 12.
  • the reaction vessel 10 has cylindrical upper section and an inverted conical base.
  • a resin inlet pipe 14 is provided at the top of the reaction vessel 10 through which an ion exchange resin for regeneration is introduced into the vessel 10.
  • a regenerating agent inlet 16 is provided at the bottom of the inverted conical base of the vessel 10 in order to introduce the regenerating agent, typically a liquid, into the reaction vessel 10.
  • the regeneration agent either for a cationic or anionic resin, as is described in the background to this specification, is introduced into the vessel 10 through the inlet 16 at a flow rate so as to form a fluidised bed within the vessel 10.
  • the insoluble regeneration product typically calcium sulphate, is formed and preferentially precipitates out onto the seeding particles.
  • the seeding particles bearing the insoluble regeneration product and the regenerated ion exchange resin beads are withdrawn from the reaction vessel 10 and introduced into the separation vessel 12 by means of pipe 18.
  • the separation vessel 12 is best illustrated by reference to Figure 2.
  • the separation vessel 12 like the reaction vessel 10, has an upper cylindrical section 20 and a low inverted conical section 22.
  • the separation vessel 12 includes a screen separator 24 mounted within the separation vessel 12.
  • the screen separator 24 has a cylindrical screen frame 26 within which is mounted a screen 28 which is depicted in dashed outline. At the upper end of the cylindrical screen frame 26 the screen separator has an impeller 30 mounted on the drive shaft 32 of an electric motor 34. Mounted within the screen 28 is a frusto-conical flow director 36. This type of screen separator is known an is more fully described in South African patent no. 91/1342.
  • the screen 28 is formed of a fine wire mesh having apertures of a size selected so as to allow the seeding particles bearing the insoluble regeneration product to pass through the screen while preventing the resin beads from passing through the screen.
  • screen separator scrapers or sweep arms may be provided around the outer surface of the screen so that on rotation of the arms about the screen the arms agitate and dislodge any solids which form or accumulate on the outer surface of the screen.
  • the beads and the seeding particles, bearing the insoluble regeneration product are introduced into the separation vessel 12 through inlet 37.
  • the slurry of regeneration beads and seeding particles within the regenerating liquor is allowed to accumulate within the separating vessel to a level generally corresponding to the level indicated in Figure 2.
  • the impeller 30 is rotated within the upper end of the separating screen 28 drawing the regenerating agent and the seeding particles through the screen and discharging these particles and liquor into the launder 38.
  • the discharge of the liquor into the launder at the top of the separating vessel is advantageous as it allows for flow of the liquor into a further vessel by gravity an does not require the liquor to be elevated to a further vessel, which can be costly.
  • An outlet pipe 40 is provided to draw the liquor and particles away from the launder 38. It will be appreciated that in this way the seeding particles and the regenerating liquor are extracted from the slurry within the separation vessel leaving the regenerated ion exchange resin beads within the vessel. During the separation phase additional liquid may be introduced into the separating vessel 22 to aid with the separation process.
  • the provision of the separate separation vessel 12 allows the liquor to de- super saturate in the reaction vessel 10 before the liquor reaches the separation vessel 12. This reduces scaling of calcium sulphate on the separating screen 28 in the separating vessel 12. Accordingly, the screen in the process of the present invention requires cleaning less frequently than the screen in the process disclosed in US 5,269,936.
  • the apparatus described above allows a variety of adaptions in its configuration and construction, all falling within the scope of the present invention. The described embodiment of the invention should accordingly not be construed as being limiting on the scope of this invention.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treatment Of Water By Ion Exchange (AREA)

Abstract

La présente invention concerne un procédé de régénération de résine échangeuse d'ions et de séparation de grains de résine échangeuse d'ions de particules d'ensemencement contenant un produit de régénération insoluble. Le procédé consiste à introduire un agent de régénération, des particules d'ensemencement et une résine échangeuse d'ions dans une zone de réaction (10), à mettre en réaction l'agent de régénération avec des ions contaminants provenant de la résine échangeuse d'ions pour obtenir un produit de régénération insoluble, à permettre au produit de régénération insoluble de se déposer sur les particules d'ensemencement, à transférer la résine et les particules d'ensemencement de la zone de réaction à une zone de séparation (12), et à séparer la résine échangeuse d'ions des particules d'ensemencement par entraînement des particules d'ensemencement sur un filtre (28).
PCT/EP1998/003843 1997-06-24 1998-06-23 Procede de regeneration de resine echangeuse d'ions Ceased WO1998058737A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU87286/98A AU8728698A (en) 1997-06-24 1998-06-23 Process for regenerating ion exchange resin

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA973553 1997-06-24
ZA97/3553 1997-06-24

Publications (1)

Publication Number Publication Date
WO1998058737A1 true WO1998058737A1 (fr) 1998-12-30

Family

ID=25586378

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1998/003843 Ceased WO1998058737A1 (fr) 1997-06-24 1998-06-23 Procede de regeneration de resine echangeuse d'ions

Country Status (2)

Country Link
AU (1) AU8728698A (fr)
WO (1) WO1998058737A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8551340B2 (en) 2007-09-26 2013-10-08 Bioteq Environmental Technologies Inc. Method for selective sulphate removal by exclusive anion exchange from hard water waste streams
US9085779B2 (en) 2008-02-12 2015-07-21 Bioteq Environmental Technologies Inc. Processes for producing h2s using sulphur-reducing bacteria

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3238126A (en) * 1963-03-08 1966-03-01 Union Tank Car Co Method of regenerating particulate ion exchange resin particles
US5238117A (en) * 1991-12-20 1993-08-24 Kemix(Proprietary) Limited Mineral processing screen separator
US5269936A (en) * 1989-10-16 1993-12-14 Johannesburg Consolidated Investment Co. Process for treating ion exchange resin

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3238126A (en) * 1963-03-08 1966-03-01 Union Tank Car Co Method of regenerating particulate ion exchange resin particles
US5269936A (en) * 1989-10-16 1993-12-14 Johannesburg Consolidated Investment Co. Process for treating ion exchange resin
US5238117A (en) * 1991-12-20 1993-08-24 Kemix(Proprietary) Limited Mineral processing screen separator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8551340B2 (en) 2007-09-26 2013-10-08 Bioteq Environmental Technologies Inc. Method for selective sulphate removal by exclusive anion exchange from hard water waste streams
US8840793B2 (en) 2007-09-26 2014-09-23 Bioteq Environmental Technologies Inc. Selective sulphate removal by exclusive anion exchange from hard water waste streams
US9085779B2 (en) 2008-02-12 2015-07-21 Bioteq Environmental Technologies Inc. Processes for producing h2s using sulphur-reducing bacteria

Also Published As

Publication number Publication date
AU8728698A (en) 1999-01-04

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