Method for regeneration of ion exchange resin causing reduction of desorption solution

Patent metadata

Field	Value
Publication number	US-9724687-B2
Application number	US-201414911994-A
Country	US
Kind code	B2
Filing date	Aug 8, 2014
Priority date	Aug 14, 2013
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

Abstract

Implementations herein relate to methods for reducing a desorption solution for regeneration of ion exchange resins in the field of regeneration of resins. The implementations solve problems related to low utilization rates of regeneration agents and high volumes of desorption solutions during the desorption process. The implementations include regenerating the ion exchange resins, and the regeneration solution becomes the desorption solution. After coagulating sedimentation of the desorption solution and slurry separation, a large amount of organic contents are removed from coagulation serum and a large amount of regenerate agents are left. The implementations further include adding the regeneration agent to the coagulation serum to form new or refreshed regeneration solution to regenerate the ion exchange resins. Accordingly, the coagulation serum may be generated from the desorption solution. These operations may be repeated multiple batches for resin regeneration.

First claim

What is claimed is:

1. A method for reducing a desorption solution for regeneration of ion exchange resins, the method comprising:
(a) mixing a regeneration solution and the ion exchange resins for about 10-120 minutes to regenerate the ion exchange resins, the regeneration solution becoming the desorption solution;
(b) adding a coagulant to the desorption solution to perform coagulating sedimentation;
(c) performing a slurry separation on the desorption solution after the coagulating sedimentation to form a coagulation serum and to generate an amount of sludge that is disposed;
(d) adding an amount of a regeneration agent to the coagulation serum to form modified regeneration solution;
(e) performing operations of the step (a) using the modified regeneration solution formed in the step (d) to regenerate the ion exchange resins;
(f) repeating a plurality of batches of the steps (a) to (e); and
in response to a determination that the regeneration solution fails to satisfy a predetermined condition, disposing the desorption solution.

2. The method of claim 1 , wherein the coagulant comprises at least one of PAC, aluminum sulfate, ferric chloride polymerization, PFS, or polyacrylamide.

3. The method of claim 1 , wherein a dosage of the coagulant dosage is about 100-5000 mg/L.

4. The method of claim 1 , wherein a ratio between a volume of the coagulation serum and a volume of the desorption solution is about from 80 to 99.5%.

5. The method of claim 1 , wherein the added regeneration agent comprises at least one of sodium bicarbonate, sodium chloride, sodium hydroxide, potassium hydroxide, or potassium chloride.

6. The method of claim 1 , wherein the amount of the added regeneration agent is 5-40% of an amount of the modified regeneration solution.

7. The method of claim 1 , wherein a number of the plurality of batches is 2-30.

Assignees

• Nanjing University Of Technology
• Nanjing Univ & Yancheng Acad Of Env Prot Tech And Eng

Inventors

• Li Aimin
• Xu Zixiao
• Jiang Bicun
• Shuang Chendong
• Zhou Qing
• Li Wentao
• Ding Xinchun
• Jiang Yeli
• Wang Mengqiao
• Shen Ke
• Zhou Weiwei

Classifications

• B01J49/50 Primary

  characterised by the regeneration reagents · CPC title

• B01J49/0065 Primary

  Operations & Transport · mapped topic

• C02F1/52

  by flocculation or precipitation of suspended impurities {(C02F1/463 takes precedence)} · CPC title

• C02F2303/16

  Regeneration of sorbents, filters · CPC title

• C02F1/42

  by ion-exchange (ion-exchange in general B01J) · CPC title