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A kind of method for preparing 2-mercaptoethanol from sodium hydrosulfite production waste liquid

A technology of mercaptoethanol and hydrosulfite is applied in the field of preparing 2-mercaptoethanol from hydrosulfite production waste liquid, which can solve the problems of incomplete classification and recovery of waste liquid and the like

Active Publication Date: 2021-02-23
烟台市金河保险粉厂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem of incomplete classification and recycling of waste liquid produced by sodium formate method for preparing sodium hydrosulfite, the present invention provides a method for preparing 2-mercaptoethanol from waste liquid from hydrosulfite production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A method for preparing 2-mercaptoethanol from sodium hydrosulfite production waste liquid, comprising the steps of:

[0017] 1) Put the waste liquid from sodium hydrosulfite production into a stirring tank, and start stirring to form a stable liquid after heating up to 50°C;

[0018] 2) Boost the pressure to 0.25MPa, slowly add a sodium hydroxide solution with a concentration of 38wt% under stirring, control the pH of the reaction solution between 8.5-10.0, and stop stirring for 30 minutes after reacting for 90 minutes;

[0019] 3) Rectify the reaction solution in a rectification tower with a vacuum degree of 30KPa, control the temperature of the tower tank to 159°C, and the temperature of the tower top to 75°C, cool the outlet gas from the tower top with circulating water, and then pass through -10°C brine Condensed by the condenser, the condensate is 2-mercaptoethanol with a purity of 98.7%. The residual liquid at the bottom of the tower is evaporated and concentrated...

Embodiment 2

[0021] A method for preparing 2-mercaptoethanol from sodium hydrosulfite production waste liquid, comprising the steps of:

[0022] 1) Put the waste liquid from sodium hydrosulfite production into a stirring tank, and start stirring to form a stable liquid after heating up to 52°C;

[0023] 2) Boost the pressure to 0.2MPa, slowly add a sodium hydroxide solution with a concentration of 32wt% under stirring, control the pH of the reaction solution between 8.5-10.0, and stop stirring for 30 minutes after reacting for 90 minutes;

[0024] 3) Rectify the reaction solution in a rectification tower with a vacuum degree of 40KPa, control the temperature of the tower tank to 158°C, and the temperature of the tower top to 73°C, cool the gas from the top of the tower with circulating water, and then pass through -12°C brine Condensed by the condenser, the condensate is 2-mercaptoethanol with a purity of 98.3%. The residual liquid at the bottom of the tower is evaporated and concentrated,...

Embodiment 3

[0026] A method for preparing 2-mercaptoethanol from sodium hydrosulfite production waste liquid, comprising the steps of:

[0027] 1) Put the sodium hydrosulfite production waste liquid into a stirring tank, and start stirring to a stable liquid after heating up to 55°C;

[0028] 2) Boost the pressure to 0.15MPa, slowly add a sodium hydroxide solution with a concentration of 25wt% under stirring, control the pH of the reaction solution between 8.5-10.0, and stop stirring for 30 minutes after reacting for 90 minutes;

[0029] 3) Rectify the reaction liquid in a rectification tower with a vacuum degree of 50KPa, control the temperature of the tower tank to 157°C, and the temperature of the tower top to 70°C, cool the gas from the top of the tower with circulating water, and then pass through -15°C brine The condenser condenses, and the condensate is 2-mercaptoethanol with a purity of 99.1%. The residue at the bottom of the tower is evaporated and concentrated, washed with metha...

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Abstract

The invention discloses a method for preparing 2-mercaptoethanol from sodium hydrosulfite production waste liquid, which comprises the following steps: 1) Put the hydrosulfite production waste liquid into a stirring tank, heat up to 50-55°C and start stirring to form a stable liquid ; 2) pressurize to 0.15-0.25MPa, slowly add sodium hydroxide solution under stirring, control the pH of the reaction solution between 8.5-10.0, after reacting for 90min, stop stirring and keep warm for 30min; 3) put the reaction solution at 30 to 50KPa Carry out rectification in a rectification tower with a vacuum degree, control the temperature of the tower bottom at 157-159°C, and the temperature at the top of the tower at 70-75°C, cool the outlet gas at the top of the tower with circulating water, and then condense it with brine from -10°C to -15°C The condensate is 2‑mercaptoethanol. The beneficial effects of the present invention are: the present invention utilizes the waste liquid produced in the production process of hydrosulfite to produce 2-mercaptoethanol, which can make the waste liquid produced in the production process of hydrosulfate reach harmless classification treatment, and produce 2-mercaptoethanol with a purity of more than 98%. 2-mercaptoethanol product, and by-product sodium sulfate product.

Description

technical field [0001] The invention relates to the field of waste recycling, in particular to a method for preparing 2-mercaptoethanol from sodium hydrosulfite production waste liquid. Background technique [0002] 2-Hydroxyethanol, also known as β-mercaptoethanol, 2-hydroxyethanethiol, β-mercaptoethanol) is an important organic compound whose chemical formula is C 2 h 6 OS, molecular weight: 78.14, CAS number: 60-24-2. 2-Mercaptoethanol is a colorless transparent liquid with a little mercaptan smell, flash point: 73°C, melting point: -100°C, boiling point: 157-158 ℃, relative density (water=1): 1.1143, relative vapor density (air=1): 2.69, easily soluble in organic solvents such as water, ethanol and ether, and miscible with benzene in any proportion. 2-Mercaptoethanol can be used as an intermediate in organic synthesis for the production of pesticides, medicines, dyes, and photographic chemicals. It can also be used as an auxiliary agent in rubber, textile, plastic and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C323/12C07C319/02C07C319/28C01D5/00
CPCC01D5/00C07C319/02C07C319/28C07C323/12
Inventor 王国清
Owner 烟台市金河保险粉厂有限公司