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A kind of purification method of alcohol amine solution

An alcohol amine solution and alcohol amine technology are applied in chemical instruments and methods, separation methods, chemical/physical processes, etc., and can solve problems such as unfavorable hydrogen sulfide sequestration, increased energy consumption of gas purification devices, and pH value of alcohol amine solutions. Increase and other problems to achieve the effect of ensuring the selective adsorption of hydrogen sulfide

Active Publication Date: 2020-12-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, the heat-stable salt anion is replaced with the hydroxide anion on the strong basic anion exchange resin to form a strong basic hydroxide, which increases the pH value of the alcohol amine solution, which is also not conducive to the selective absorption of hydrogen sulfide. sex
To sum up, if the method provided by the prior art is used to purify the alcohol amine solution, the problem of poor hydrogen sulfide selective absorption will occur, which will not only increase the energy consumption of the gas purification device, but also cause the product gas to be unqualified

Method used

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  • A kind of purification method of alcohol amine solution
  • A kind of purification method of alcohol amine solution
  • A kind of purification method of alcohol amine solution

Examples

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Embodiment 1

[0078] In this embodiment, the alcohol amine solution of a certain natural gas purification plant is purified, wherein the mass fraction of thiosulfate in the alcohol amine solution is 257×10 -6 , the total mass fraction of other corrosive impurities except thiosulfate radicals is 3492×10 -6 , ie less than 0.9%. Specifically, the corrosive impurities include oxalate, chloride, N,N-dihydroxyethylglycine, sulfate, formate, acetate and glycolate, and thiocyanate.

[0079] In this embodiment, three kinds of ion exchange resin columns filled with different resins are used to purify the alcohol amine solution. The 1# resin column is filled with macroporous weakly basic anion exchange resin D301 and polar adsorption resin XDA-7 (mass ratio: 6:1);

[0080] 2# resin column is filled with macroporous strong basic anion exchange resin D201 and polar adsorption resin XDA-7 (mass ratio is 6:1);

[0081] The 3# resin column is packed with gel-type strong basic anion exchange resin 201 an...

Embodiment 2

[0091] In this embodiment, the same alcoholamine solution as in Example 1 is purified,

[0092] In this embodiment, two kinds of ion exchange resin columns filled with different resins are used to purify the alcohol amine solution, and the 4# resin column is filled with gel-type strongly basic anion exchange resin 201;

[0093] The 5# resin column is filled with gel-type strong basic anion exchange resin 201 and polar adsorption resin ADS-7 (mass ratio is 5:1) (that is, the desired in the present invention).

[0094] The inner diameters of the two resin columns are both 25 mm, and the resin volumes are both 60 mL.

[0095] The specific purification steps are as follows:

[0096] 4# resin column was rinsed with 120mL of 4% sodium hydroxide aqueous solution and then with 60mL of desalted water before processing the alcoholamine solution.

[0097] 5# resin column was rinsed with 120 mL of 4% sodium thiosulfate aqueous solution and then with 60 mL of desalted water before proces...

Embodiment 3

[0103] In this embodiment, the same alcoholamine solution as in Example 1 is purified,

[0104] In this embodiment, three kinds of ion exchange resin columns filled with different resins are used to purify the alcohol amine solution. The 6# resin column is filled with gel type strong basic anion exchange resin 201 and polar adsorption resin ADS-7 (mass ratio: 5:1) (i.e. desired by the present invention);

[0105] 7# resin column is filled with strongly acidic cation exchange resin 001 (that is desired in the present invention);

[0106] The 8# resin column is packed with gel-type strongly basic anion exchange resin 201.

[0107] The inner diameters of the three resin columns are all 60 mm, and the volumes of the resins are all 500 mL.

[0108] The specific purification steps are as follows:

[0109] The alcohol amine solution is treated by the desired method of the present invention and the existing method respectively. After each treatment, corrosive impurities are added to...

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Abstract

The invention discloses a purification method of an alkanolamine solution and belongs to the field of chemical purification. The method comprises the following steps: when the total mass fraction of corrosive impurities in the alcohol amine solution is less than 0.9%, the N, N-dihydroxyethyl glycine is adsorbed and removed by treating the alcohol amine solution with first mixed resin rinsed with aweakly corrosive salt solution, and at the same time, the heat-stable salt anion is replaced with an anion of weakly corrosive salt; when the total mass fraction of corrosive impurities in the alcohol amine solution is greater than or equal to 0.9%, part of the alcohol amine solution is treated successively with cation exchange resin rinsed with an aqueous solution of alcohol amine and second mixed resin rinsed with alkali liquor, inorganic heat-stable salt is converted to heat-stable amine salt, and the heat-stable salt anion and N, N-dihydroxyethyl glycine are adsorbed and removed. The first and second mixed resins both include polar adsorption resin and strongly basic anion exchange resin. By the above method, corrosiveness of the alcohol amine solution can be reduced and excellent hydrogen sulfide selective absorption of the alcohol amine solution also can be maintained.

Description

technical field [0001] The invention relates to the field of chemical purification, in particular to a method for purifying an alcohol amine solution. Background technique [0002] The alcohol amine method is usually used to desulfurize and decarbonize natural gas, refinery gas and other industrial gases to achieve the purpose of gas purification. In the above gas purification process, the alcohol amine solution used is polluted by its own disproportionation, oxidation and raw material gas Instead, corrosive impurities are produced, including N,N-bishydroxyethylglycine and heat stable salts. Among them, thermally stable salts are classified according to cations, including thermally stable amine salts and inorganic thermally stable salts; classified according to anions, including oxalate, chlorate, sulfate, formate, acetate, glycolate, thio Sulfates, Thiocyanates. The heat stable salt will be ionized in the alcohol amine solution to generate the corresponding heat stable sa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D15/08B01D15/20B01D15/24B01D15/36B01D15/42
CPCB01D15/08B01D15/206B01D15/245B01D15/362B01D15/363B01D15/364B01D15/42
Inventor 颜晓琴何金龙吴明鸥常宏岗涂陈媛熊钢高立新陈庆梅
Owner PETROCHINA CO LTD