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Method for purifying and regenerating decarburization solution

A solution and decarburization technology, applied in chemical instruments and methods, separation methods, inorganic chemistry, etc., can solve problems such as poor solution cleanliness, increased system resistance, and reduced potassium carbonate concentration, and achieve the effect of improving purity

Pending Publication Date: 2021-02-26
陕西双翼煤化科技实业集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual operation process, since the syngas contains organic substances such as alcohols, aldehydes, acids, ketones, and esters, after being washed by the circulating gas washing tower, there are still some residues, and the organic substances such as aldehyde acids enter the hot potash with the tail gas In the solution system, an acid-base neutralization reaction occurs with potassium carbonate, and the generated organic acid potassium is blocked in the pipeline and equipment packing, resulting in an increase in the resistance of the entire system, prone to accidents such as flooding, and resulting in a decrease in the concentration of potassium carbonate and decarburization poor effect
And potassium carbonate content declines, and solution absorption capacity declines, because the organic matter such as alcohol, aldehyde, acid, ketone, ester is constantly accumulated in hot potassium alkali solution, causes solution cleanliness poor, absorption capacity declines, can not be effectively removed by adding potassium carbonate Potassium carbonate is maintained at the target concentration, and the hot potash solution needs to be replaced regularly. The consumption of hot potash solution is large, the cost is high, and there is no normal disposal channel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 10L decarburization solution (mainly potassium carbonate solution, containing KHCO 3 and CH 3 COOK, C 2 h 5 COOK and other organic acid potassium solutions) were concentrated under reduced pressure at 70°C until potassium carbonate solids were precipitated to obtain a hot saturated solution of potassium carbonate; then, maintaining the temperature, 80 g of porous glass with a pore diameter of 50 nm was soaked in 1 L of the resulting hot saturated solution, Cool down to room temperature at a cooling rate of 2° C. / min, filter, and roast the resulting filter cake at 400° C. for 50 minutes to obtain potassium carbonate with a purity greater than 98%.

Embodiment 2

[0016] 10L decarburization solution (mainly potassium carbonate solution, containing KHCO 3 and CH 3 COOK, C 2 h 5 COOK and other organic acid potassium solutions) were concentrated under reduced pressure at 60°C until potassium carbonate solids were precipitated to obtain a hot saturated solution of potassium carbonate; then, maintaining the temperature, 60 g of porous glass with a pore diameter of 60 nm was soaked in 1 L of the resulting hot saturated solution, Cool down to room temperature at a cooling rate of 3° C. / min, filter, and roast the resulting filter cake at 400° C. for 50 minutes to obtain potassium carbonate with a purity greater than 95%.

Embodiment 3

[0018] 10L decarburization solution (mainly potassium carbonate solution, containing KHCO 3 and CH 3 COOK, C 2 h 5 COOK and other organic acid potassium solutions) were concentrated under reduced pressure at 80°C until potassium carbonate solids were precipitated to obtain a hot saturated solution of potassium carbonate; then, maintaining the temperature, 70 g of porous glass with a pore diameter of 50 nm was soaked in 1 L of the resulting hot saturated solution, Cool down to room temperature at a cooling rate of 3° C. / min, filter, and roast the resulting filter cake at 500° C. for 30 minutes to obtain potassium carbonate with a purity greater than 96%.

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Abstract

The invention discloses a method for purifying and regenerating a decarburization solution, which comprises the following steps of carrying out reduced pressure distillation on the decarburization solution to obtain a thermal saturated solution of the decarburization solution, soaking porous glass with nano pore size into the obtained thermal saturated solution, gradually cooling, crystallizing and filtering, and roasting the obtained filter cake at 300-500 DEG C to obtain purified potassium carbonate. According to the method, the saturated solution of potassium carbonate is obtained from thedecarburization liquid in a reduced pressure distillation manner, and then cooling crystallization is limited in a nano space through porous glass, so that the growth environment of crystallization nucleation is changed, and the crystallization rate and the purity of the obtained potassium carbonate are improved; and the method has certain practical significance for industrialization of purification of potassium carbonate in the decarburization solution.

Description

technical field [0001] The invention belongs to CO 2 The technical field of absorption treatment, in particular to a method for purifying and regenerating a decarbonization solution. Background technique [0002] Hot potash decarburization technology refers to the use of heated potassium carbonate liquid as a chemical agent to decarbonize CO in syngas 2 to absorb. This process is widely used in the industrial production of syngas decarbonization due to the lowest loss of hydrocarbons. However, in the actual operation process, since the syngas contains alcohols, aldehydes, acids, ketones, esters and other organic substances, after being washed by the circulating gas washing tower, there are still some residues, and the organic substances such as aldehyde acids enter the hot potash with the tail gas In the solution system, an acid-base neutralization reaction occurs with potassium carbonate, and the generated organic acid potassium is blocked in the pipeline and equipment p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14C01D7/22C01D7/24
CPCB01D53/1425B01D53/1475B01D2252/10C01D7/22C01D7/24
Inventor 张智芳冯利军冯亚军
Owner 陕西双翼煤化科技实业集团有限公司