Tail gas treatment method for preparing DL-homocystine

A technology for tail gas treatment and homocysteine, which is applied in the direction of gas treatment, separation methods, chemical instruments and methods, etc., can solve the problems of gas emission, not fundamentally solved, and untargeted tail gas treatment, so as to achieve enhanced removal rate, The effect of uniform exhaust gas contact

Active Publication Date: 2021-11-02
九江中星医药化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because dimethyl disulfide has the same odor of sulfide as sulfur dioxide, if you do not analyze and identify it carefully, it is easy to think that dimethyl disulfide gas is sulfur dioxide, resulting in untargeted tail gas treatment, incomplete tail gas treatment, and toxic gas emission
In addition, although the current use of liquid caustic soda to treat the exhaust gas reduces the working environment of the production workshop to a certain extent, but the caustic soda absorption liquid is pumped into the Fenton oxidation unit of the sewage treatment system, and the sulfur dioxide and some of the originally absorbed sulfur dioxide are poisonous through acid adjustment. , smelly gas then overflows again, so this method does not fundamentally solve the distribution of poisonous, smelly gas

Method used

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  • Tail gas treatment method for preparing DL-homocystine
  • Tail gas treatment method for preparing DL-homocystine
  • Tail gas treatment method for preparing DL-homocystine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Add 50.0 g of DL-methionine and 60.0 g of water into a 500 mL four-neck flask, stir at room temperature, and slowly add 80.0 g of concentrated sulfuric acid dropwise to the system. After the addition, the temperature of the system was raised to 125°C. The system adopted a slight negative pressure, and an exhaust gas absorption device was installed in the middle. The device was equipped with 5.0% mass concentration of hydrogen peroxide, and the whole process was reacted for 8 hours. After the reaction, detect the components in the absorption solution.

Embodiment 2

[0035] Add 50.0 g of DL-methionine and 60.0 g of water into a 500 mL four-neck flask, stir at room temperature, and slowly add 80.0 g of concentrated sulfuric acid dropwise to the system. After the addition, the temperature of the system was raised to 125°C. The system adopted a slight negative pressure, and an exhaust gas absorption device was installed in the middle. The device was equipped with a 15.0% mass concentration of sodium hypochlorite solution, and the whole process was reacted for 8 hours. After the reaction, detect the components in the absorption liquid.

Embodiment 3

[0037] Add 50.0 g of DL-methionine and 60.0 g of water into a 500 mL four-neck flask, stir at room temperature, and slowly add 80.0 g of concentrated sulfuric acid dropwise to the system. After the addition, the temperature of the system is raised to 125°C. The system adopts a slight negative pressure, and an exhaust gas absorption device is installed in the middle. The device is equipped with a 15.0% mass concentration of sodium hypochlorite solution and a 5.0% mass concentration of hydrogen peroxide. The whole process is reacted for 8 hours. After the reaction, detect the components in the absorption liquid.

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Abstract

The invention discloses a tail gas treatment method for preparing DL-homocystine, and belongs to the field of medicines. The tail gas comprises sulfur dioxide gas and dimethyl disulfide gas, and oxidation absorption liquid is adopted to treat the tail gas. The method comprises the steps: treating tail gas through modified magnesium lithium silicate and then introducing the tail gas into oxidation absorption liquid to be treated, layering a solution obtained after treatment stands still, and taking an oil phase after water-oil separation; and finally, extracting, condensing and removing the oil phase by adopting an extracting agent. According to the tail gas treatment method for preparing the DL-homocystine, dimethyl disulfide can generate colorless and odorless dimethyl sulfoxide and sulfur dioxide can generate sulfuric acid respectively by adopting the oxidation absorption liquid, so emission of toxic and odorous gases is eliminated fundamentally; meanwhile, even if the oxidation absorption liquid enters a Fenton oxidation unit of a sewage treatment system for operation, toxic gas cannot overflow again due to re-acidification.

Description

technical field [0001] The invention relates to a clean production method of a compound, in particular to a tail gas treatment method for preparing DL-homocystine. Background technique [0002] Homocysteine ​​and its reductive cyclization product (homocysteine ​​thiolactone hydrochloride) are important intermediates in traditional Chinese medicine and pesticides. Its structural formula is as follows: [0003] The literature J.Biol.chem,99;135-142 first proposed the synthesis method of homocystine: heating methionine and excess sulfuric acid to prepare homocysteine. This method has been used until now, and there is sulfur dioxide as a by-product in the main reaction tail gas of this method. , At the same time, due to the low reaction yield, some raw materials have side reactions to generate DL-homoserine and dimethyl disulfide. Its reaction equation is as follows: [0004] [0005] At present, the treatment of tail gas in the industrial route is all focused on how to co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75B01D11/04B01D53/48B01D53/50B01D53/73B01D53/79B01D53/81C07C315/06C07C317/04
CPCB01D53/507B01D53/48B01D53/79B01D53/75B01D53/81B01D53/73B01D11/0492C07C315/06B01D2251/106B01D2251/108B01D2257/302B01D2257/306B01D2258/02C07C317/04
Inventor 周以鸿骆建轻胡惠新程龙进李仲新
Owner 九江中星医药化工有限公司
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