Method for removing thermostable salt in amine liquid for desulphurization

A technology for desulfurizing amine solution and thermally stable salt, which is applied in separation methods, chemical instruments and methods, ion exchange column/bed methods, etc., and can solve the problems of difficult treatment of desulfurizers, fast accumulation of sulfate radicals, and large total amount. , to achieve the effect of balancing regeneration difficulties, balancing the exchange rate is slow, and reducing the dosage

Active Publication Date: 2009-08-12
LUOYANG PETROCHEMICAL ENG CORP SINOPEC
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0013] The present invention aims at the problem that it is difficult to deal with the desulfurization agent with high sulfate content in the prior art, and provides a new method for removing heat-stable salts in the desulfurization amine liquid, which can solve the problem in the renewable wet flue gas desulfurization system Sulfate accumulation speed is fast and the total amount is large, and there is a high available exchange capacity, which can run continuously for a long period without special treatment of the resin

Method used

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  • Method for removing thermostable salt in amine liquid for desulphurization
  • Method for removing thermostable salt in amine liquid for desulphurization
  • Method for removing thermostable salt in amine liquid for desulphurization

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Embodiment 1～5

[0027] Add 25ml of fresh 717 (201×7) strong basic anion exchange resin that has been pretreated and transformed into OH type into five 200ml beakers respectively, and add 75ml of amine solution with a sulfate content of 12000mg / L for ion exchange test . The first beaker stops stirring after 1 minute, separates the resin and the amine solution, washes the resin 3 times with deionized water, collects the mixed amine solution and constant volume, analyzes the sulfate ion content, and calculates the total amount of sulfate radical remaining in the solution; then After 3 minutes, after 5 minutes, after 15 minutes, and after 30 minutes, the exchange test was performed sequentially. According to the content change of sulfate ion in the amine liquid, evaluate the exchange rate of sulfate ion on the resin.

[0028]According to the above method, measure the exchange rate of 202II type strongly basic anion exchange resin, D301 weakly basic anion exchange resin, D318 weakly basic anion e...

Embodiment 6～10

[0032] In the 200ml beaker, pack 25ml pre-treated 717 type strongly basic anion exchange resin, then add 75ml of amine solution with sulfate radical content of 12000mg / L, start stirring, carry out ion exchange test, control exchange time is 15 minutes, then Separate the resin and the amine solution, wash the separated resin three times with deionized water, collect the mixed amine solution and constant volume, analyze the sulfate content, and calculate the remaining total amount of sulfate in the amine solution. After the resin is rinsed, soak it with 75ml of 4% sodium hydroxide solution for 15 minutes, and then rinse it with deionized water until neutral. Repeat the above exchange test 6 times after regeneration to investigate the regeneration performance of the resin.

[0033] According to the above method, the regeneration performance of 202II strong base anion exchange resin, D301 weak base anion exchange resin, D318 weak base anion exchange resin and PA511 weak base anion...

Embodiment 11～13

[0038] Put 500ml D301 type weakly basic anion exchange resin in a plexiglass exchange column with a diameter of 70mm and a height of 210mm, and pump 1.5L of desulfurizer with a sulfate radical content of 70000mg / L within 5 minutes for ion exchange test, and collect and purify the mixed solution , analyze the sulfate content, and calculate the sulfate removal rate. The rinsed resin column is regenerated by pumping 1.5L of 4% sodium hydroxide solution countercurrently, and the alkali injection time is 10 minutes, and then rinsed with deionized water to neutrality, and enters the next purification cycle after the regeneration of the resin is completed.

[0039] According to the above method, the heat stable salt removal rate and stability of PA511 and 202II resins in the purification of desulfurizers were investigated in turn. The result is as figure 2 shown.

[0040] Depend on figure 2 It can be seen that the use of weak base resin D301 and strong base II resin can obtain s...

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Abstract

The invention discloses a method for removing heat-stable salts in amine desulphurization, aiming at solving the problem that the prior art has difficulty in treating desulphurizer with high content of sulfate radical. The method is as follows: strong base type II anion exchange resin with particle size of 0.5-1.5mm is filled in an ion exchange resin tower with height-diameter ratio of 1:1-3:1, the desulphurized amine solution with PH value less than 5.4 passes through the ion exchange resin tower at the airspeed of 30h-50h to experience purifying treatment, when the PH value of the desulphurized amine solution at the exit of the resin tower is equal to that at the entrance of the resin tower, sodium hydroxide solution is used to carry out upflow regeneration on the ion exchange resin, and the regenerated ion exchange resin is recycled. The method can solve the problems of rapid cumulative rate and large total content of the sulfate radical in reproducible wet method flue gas desulphurization system.

Description

technical field [0001] The invention belongs to a method for regenerating amine absorbents, and relates to a method for removing heat-stable salts in desulfurization amine liquid. Background technique [0002] Aqueous solutions of basic compounds such as organic amines are widely used in acidic gases (H 2 S, CO 2 , SO 2 etc.) removal and recovery. The principle is that the low-concentration acid gas contacts with the lye to generate organic ammonium salts that can be decomposed to form a rich solution, which is then heated and decomposed in the desorption tower to release high-concentration acid gas for recycling, and at the same time the amine solution is converted into lean liquid, the regenerated amine liquid can be reused. [0003] During the periodic absorption and desorption process, on the one hand, the amine liquid itself will be oxidized and degraded to form organic acid radicals such as formate, oxalate, acetate, and thiocyanate; on the other hand, acidic gases...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14B01D53/78B01D53/96B01J41/04B01J47/02B01J49/00C07C213/10
Inventor 李朝恒陈卫红刘金龙王秀珍裴旭东郝代军刘翠强郭荣群张凡涂先红
Owner LUOYANG PETROCHEMICAL ENG CORP SINOPEC
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