Method for regeneration of spent ion exchange resins

Patent metadata

Field	Value
Publication number	US-9809739-B2
Application number	US-201414915887-A
Country	US
Kind code	B2
Filing date	Aug 19, 2014
Priority date	Sep 2, 2013
Publication date	Nov 7, 2017
Grant date	Nov 7, 2017

Abstract

The present disclosure relates to a method for regeneration of spent ion exchange resins to obtain regenerated ion-exchange resins. The regenerated ion exchange resins can efficiently reduce the total acid number (TAN) of highly acidic crude oils. The present disclosure particularly relates to a method of treatment of spent ion exchange resins using at least one non-acidic crude oil condensate and at least one polar organic solvent.

First claim

The invention claimed is:

1. A method for regeneration of spent ion-exchange resin to obtain regenerated ion-exchange resin, said method comprising the following steps:
a. contacting said spent ion-exchange resin with at least one non-acidic crude oil condensate to obtain cleansed ion-exchange resin;
b. contacting said cleansed ion-exchange resin with at least one polar organic solvent to obtain heavy hydrocarbon free ion-exchange resin;
c. treating said heavy hydrocarbon free ion-exchange resin with a solution of at least one alkali or alkaline earth metal hydroxide to obtain activated ion-exchange resin;
d. iteratively washing said activated ion-exchange resin, for removing organic acids trapped in said activated ion-exchange resin, to obtain regenerated ion-exchange resin.

2. The method as claimed in claim 1 , wherein the method steps (a)-(d) are carried out in a column.

3. The method as claimed in claim 1 , wherein said method is characterized in that the proportion of said spent ion-exchange resin and said non-acidic crude oil condensate ranges from 1:1 to 1:10 by volume, and the proportion of said spent ion exchange resin and said polar organic solvent ranges from 1:0.5 to 1:5 by volume.

4. The method as claimed in claim 1 , wherein the non-acidic crude oil condensate is at least one crude oil having boiling point in the range of 35° C. to 370° C.

5. The method as claimed in claim 1 , wherein the non-acidic crude oil condensate comprises at least one of naphtha, light kerosene, toluene, heavy kerosene and diesel.

6. The method as claimed in claim 1 , wherein said spent ion-exchange resin is an anion exchange resin.

7. The method as claimed in claim 1 , wherein said spent ion-exchange resin is a macro porous anion exchange resin comprising:
i. at least one functional group selected from the group consisting of benzyl trimethyl amine chloride, benzyl dimethyl ethanolamine chloride, tertiary ammonium chloride and quaternary ammonium chloride; and
ii. a resin matrix containing a polymer, which comprises at least one of styrene/divinylbenzene copolymer and polystyrene co-polymer.

8. The method as claimed in claim 1 , wherein said organic acid is at least one compound represented by R(CH 2 ) n COOH,
wherein,
R is selected from the group consisting of a substituted alkyl group, an un-substituted alkyl group, a substituted cycloalkyl ring, and an un-substituted cycloalkyl ring; and
n ranges from 6 to 28.

9. The method as claimed in claim 1 , wherein said polar organic solvent comprises at least one of methanol, ethanol, propanol, isopropanol, butanol, isobutanol, t-butanol, pentanol, and dichloromethane.

10. The method as claimed in claim 1 , wherein said alkali or alkaline earth metal hydroxide comprises at least one of lithium hydroxide (LiOH), sodium hydroxide (NaOH), potassium hydroxide (KOH), rubidium hydroxide (RbOH), cesium hydroxide (CsOH), strontium hydroxide (Sr(OH) 2 ) and barium hydroxide (Ba(OH) 2 ).

11. The method as claimed in claim 1 , wherein the washing is carried out by using demineralized water.

Assignees

• Reliance Ind Ltd

Inventors

• Shown Biswajit
• Ghosh Swapan
• Das Asit Kumar
• Salgarkar Suyog Subhash
• Baishya Mukunda Madhav
• Ladani Mitul Amrutbhai
• Panseriya Chirag Dalpatbhai

Classifications

• B01J49/57

  for anionic exchangers · CPC title

• C09K8/524 Primary

  organic depositions, e.g. paraffins or asphaltenes · CPC title

• B01J49/60

  Cleaning or rinsing ion-exchange beds · CPC title

• B01J41/20

  Anion exchangers for chromatographic processes · CPC title