Regeneration method of spent caustic from ethylene

A technology of ethylene waste lye and lye, applied in chemical instruments and methods, multi-stage water/sewage treatment, natural water treatment, etc., can solve the problems of high consumption of sulfuric acid, high energy consumption of evaporation and crystallization, and reduce alkali consumption , to achieve recycling, to avoid the effect of secondary pollution problems

Inactive Publication Date: 2017-01-11
PETROCHINA CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

This method needs to consume a large amount of sulfuric acid, and th

Method used

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Effect test

Embodiment 1

[0032] (1) Desulfurization: Take 1L of ethylene waste lye after oil removal, its main composition is: NaOH 10121mg / L, NaOH 2 S 10525mg / L, Na 2 CO 3 43494mg / L. At 40°C, according to Cu(OH) 2 with S 2- The ratio of the amount of substances is 1.1:1. Add copper hydroxide to the ethylene waste lye, and react for 5 minutes under stirring. After the reaction is completed, filter for solid-liquid separation to obtain desulfurization precipitate and desulfurization lye. At this time, in the desulfurization alkali solution, S 2- The concentration is 5mg / L, and the desulfurization rate is 99.9%.

[0033] (2) Causticization: heat the desulfurized alkaline solution obtained from (1) to 80°C, and 2 CO 3 Add 28.08g of quicklime with a ratio of 1.1:1, the CaO content of the quicklime is 90%, and stir for 2 hours. After the reaction is completed, the solid-liquid separation is filtered to obtain caustic precipitation and regenerated lye. At this time, the Na in the regenerated lye wa...

Embodiment 2

[0037] (1) Desulfurization: Take 1L of ethylene waste lye after oil removal, its main composition is: NaOH 10121mg / L, NaOH 2 S 10525mg / L, Na 2 CO 3 43494mg / L. At 10°C, according to Cu(OH) 2 S in spent lye with ethylene 2- Add copper hydroxide in an amount of 1.0:1, react under stirring for 30 minutes, filter after the reaction and perform solid-liquid separation to obtain desulfurization precipitate and desulfurization lye. At this time, the determination of desulfurization alkali solution S 2- The concentration is 29mg / L, and the desulfurization rate is 99.3%.

[0038] (2) Causticization: heat the desulfurized alkaline solution obtained from (1) to 80°C, and 2 CO 3 Add 28.08g of quicklime at a ratio of 1.1:1. The CaO available calcium of the quicklime is 90%. Stir and react for 2 hours. After the reaction is completed, filter the solid-liquid separation to obtain caustic precipitation and regenerated lye. At this time, the Na in the regenerated lye was determined 2 C...

Embodiment 3

[0042] (1) Desulfurization: Take 1L of ethylene waste lye after oil removal, its main composition is: NaOH 10121mg / L, NaOH 2 S 10525mg / L, Na 2 CO 3 43494mg / L. At 35°C, according to Cu(OH) 2 S in spent lye with ethylene 2- Add copper hydroxide in an amount of 2.0:1, and react under stirring for 20 minutes. After the reaction is completed, the solid-liquid separation is filtered to obtain desulfurization precipitate and desulfurization alkali liquor. At this time, the determination of desulfurization alkali solution S 2- The concentration is 4mg / L, and the desulfurization rate is 99.9%.

[0043] (2) Causticization: heat the desulfurized alkaline solution obtained from (1) to 90°C, and 2 CO 3 Add 28.08g of quicklime in an amount of 1.1:1, whose CaO effective calcium is 90%, and stir for 2h. After the reaction is completed, the solid-liquid separation is filtered to obtain caustic precipitation and regenerated lye. At this point, the determination of Na in the caustic ly...

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Abstract

The invention relates to a regeneration method of spent caustic from ethylene. The method comprises the steps of desulphurization, causticization, desulfurizer regeneration and causticization agent regeneration. The method realizes desulphurization regeneration of spent caustic from ethylene under normal temperature and normal pressure, the regenerated spent caustic can be recycled, and a purpose for resource processing of the spent caustic can be realized, secondary pollution problem of the volatile organic compounds in the tail gas by a wet-type oxidation technology can be avoided; the desulfurizer is regenerated by the wet-type oxidation technology, the cycle utilization of the desulfurizer is realized, the secondary pollution generation is not generated during a desulfurizer regeneration process, compared with the prior art, the desulphurization effect is increased, the desulphurization regeneration reaction time is shortened, and the desulfurizer regeneration reaction time is shortened.

Description

technical field [0001] The invention belongs to the field of oil refining and chemical industry, relates to regeneration treatment of ethylene waste alkali liquor, and is also suitable for the treatment of sulfur-containing waste alkali liquor such as liquid hydrocarbon alkali washing waste alkali liquor. Background technique [0002] In the process of refining and chemical production, the method of washing with strong alkali solution such as sodium hydroxide is generally used to remove CO in natural gas, liquid hydrocarbons or pyrolysis gas of ethylene units. 2 、H 2 S and other acidic gases, thus producing a large amount of alkaline washing waste liquid (acid gas alkaline washing waste liquid). In addition to the remaining NaOH, the acid gas alkali washing waste liquid also contains the Na produced in the alkali washing process. 2 S, Na 2 CO 3 and other inorganic salts. At the same time, due to the process of condensation of heavy components and condensation of unsatur...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F103/36
Inventor 裴皓天马克存褚洪岭王斯晗杜龙弟丛景贺德福王桂芝徐显明杨玉和梅木春周传勇郭英姿王磊尤丽梅洪梅王薇赵吉娜陈谦高成功邵伟董建明刘通孙恩浩闫义兵雪晶姜伟朱丽娜尹燕磊郭立明
Owner PETROCHINA CO LTD
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