Method for purifying thermally stable salt in desulfurization amine solution

A technology of desulfurization amine solution and heat-stable salt, which is applied in the field of water treatment, can solve the problems of difficult removal of heat-stable salt, small adsorption capacity, and improvement of removal rate of heat-stable salt, and achieve easy handling, high-efficiency removal, The effect of reducing loss

Active Publication Date: 2020-05-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the invention introduces the magnetoelectric dialysis method, which reduces the formation of membrane scale, it still cannot fundamentally solve the problem of membrane fouling
[0009] Due to the wide variety of anions of heat-stable salts formed in amine liquid, including HCOO - , CH 3 COO - , C 2 o 4 2- , C 2 h 3 o 3 - , C 3 h 3 o 3 - , C 4 h 5 o 4 - , SO 4 2- , SO 3 2- , S 2 o 3 2- , PO 4 3- , SCN - , NO 3 - , NO 2 - , Cl - etc., which bring some difficulties to the removal of heat-stable salts
At the same time, there are problems such as small adsorption capacity when traditional adsorption materials are used in the process of heat-stable salt removal, which leads to the need to improve the removal rate of heat-stable salts.

Method used

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  • Method for purifying thermally stable salt in desulfurization amine solution

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Purification treatment of desulfurized amine liquid in a refinery, with a treatment capacity of 5m 3 / h. The alcohol amine solution used is an aqueous solution of methyldiethanolamine (MDEA), wherein the mass content of methyldiethanolamine is 23%. In the desulfurization amine liquid, the mass content of heat stable salt is 5.5%, wherein the anion of heat stable salt includes CH 3 COO - , SO 4 2- , SO 3 2- , SCN - , Cl - ; The mass content of bound amine is 1.3%, and the mass content of main metal ion is 0.9%Na + , 0.2%K + , 0.3%Fe 3+ ; Among them, the content of solid suspended particles with a diameter greater than 1 μm is 2000 ppm, and the content of hydrocarbon substances is 2000 ppm.

[0045] Filter the desulfurized amine solution to remove solid suspended particles. Filtration adopts two-stage series filter element filter, the filter element precision of the filter is 10μm and 2μm, and the filtration speed is 5m 3 / h. Two-stage series element filters...

Embodiment 2

[0050] Treat the same desulfurized amine solution as in Example 1.

[0051] Filtration adopts two-stage series filter element filter, the filter element precision of the filter is 40μm and 5μm, and the filtration speed is 10m 3 / h. Two-stage series element filters are set up in two groups or more in parallel, and operate alternately. When the pressure difference between the two ends of the filter increases by 50% after filtering, switch to another group for operation. Use desalinated water to backwash the used filter, the backwash cycle is 10 days, and the backwash water speed is 20L / m 2 ·s. After filtration, the removal rate of solid suspended particles with a particle size greater than 1 μm is 91%.

[0052] The activated carbon adsorption tower is filled with coconut shell activated carbon spherical particles with a height of 2m, the particle diameter is 4mm, and the flow rate of the regenerated amine liquid is 10m 3 / h, the residence time is 90min. Two or more sets of ...

Embodiment 3

[0055] Treat the same desulfurized amine solution as in Example 1.

[0056] Filtration adopts two-stage series filter element filter, the filter element precision of the filter is 5μm and 1μm, and the filtration speed is 1m 3 / h. Two-stage series element filters are set up in two groups or more in parallel, and operate alternately. When the pressure difference between the two ends of the filter increases by 10% after filtering, switch to another group for operation. Use desalinated water to backwash the used filter, the backwash cycle is 1 day, and the backwash water speed is 5L / m 2 ·s. After filtration, the removal rate of solid suspended particles with a particle size greater than 1 μm is 97%.

[0057] The activated carbon adsorption tower is filled with coconut shell activated carbon spherical particles with a height of 1m, the particle diameter is 1mm, and the flow rate of the regenerated amine liquid is 1m 3 / h, the residence time is 30min. Two or more sets of activa...

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Abstract

The invention relates to a method for purifying a thermally stable salt in a desulfurization amine solution. The method comprises the following steps: filtering the desulfurization amine solution to remove solid suspended particles, regenerating the desulfurization amine solution, carrying out activated carbon adsorption, and finally carrying out electric adsorption treatment on an obtained aminesolution, wherein an electrode material for electric adsorption is a metal Zn-loaded activated carbon electrode material. According to the method disclosed by the invention, the removal rate of the thermally stable salt in the desulfurization amine solution is improved by strengthening anion adsorption effect, and efficient purification of the thermally stable salt is realized.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method for purifying heat-stable salts in desulfurization amine liquid produced in natural gas plants and oil refineries. Background technique [0002] Alcohol amine solutions are widely used in refineries and natural gas plants to purify dry gas, liquefied petroleum gas, sulfur recovery tail gas and natural gas and other sulfur-containing gases. The principle is that in the absorption tower at normal temperature, the alcohol amine solution is in contact with the gas containing hydrogen sulfide, and the hydrogen sulfide and the alcohol amine molecule combine to form ammonium salt and are "absorbed" in the solution. On the one hand, the sulfur-containing gas is purified by removing hydrogen sulfide On the other hand, the alcohol amine solution "carries" hydrogen sulfide molecules into the regeneration tower, and at a regeneration temperature greater than 100°...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D36/00C02F9/06C02F103/18
CPCB01D36/00C02F9/00C02F1/001C02F1/283C02F1/4691C02F2103/18
Inventor 刘新宇李凌波李龙程梦婷李宝忠
Owner CHINA PETROLEUM & CHEM CORP
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