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A tail gas treatment method for preparing dl-homocysteine

A technology for tail gas treatment and homocystine, which is applied in gas treatment, separation methods, chemical instruments and methods, etc., can solve the problems of gas emission, no fundamental solution, incomplete tail gas treatment, etc., and achieve uniform exhaust gas contact and removal. rate enhancement effect

Active Publication Date: 2022-05-03
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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  • A tail gas treatment method for preparing dl-homocysteine
  • A tail gas treatment method for preparing dl-homocysteine
  • A tail gas treatment method for preparing dl-homocysteine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 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 a tail gas absorption device is installed in the middle, and the device is equipped with 5.0% mass concentration of hydrogen peroxide, and the whole process is reacted for 8 hours. After the reaction, detect the components in the absorption solution.

Embodiment 2

[0034] 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 a tail gas absorption device is installed in the middle, and a sodium hypochlorite solution with a mass concentration of 15.0% is installed in the device, and the whole process is reacted for 8 hours. After the reaction, detect the components in the absorption solution.

Embodiment 3

[0036] 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 adding, 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 15.0% mass concentration of sodium hypochlorite solution and 5.0% mass concentration of hydrogen peroxide, and the whole process is reacted for 8 hours. After the reaction, detect the components in the absorption solution.

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Abstract

The invention discloses a tail gas treatment method for preparing DL-homocystine, which belongs to the field of medicine. The tail gas includes sulfur dioxide gas and dimethyl disulfide gas, and the tail gas is treated with an oxidation absorption liquid. First, the tail gas is treated with modified magnesium lithium silicate, and then passed into the oxidation absorption liquid for treatment, the solution obtained after the treatment is left to stand for stratification, and the oil phase is taken after the water and oil are separated; finally, the oil phase is extracted with an extractant Carry out extraction and condensation removal. A tail gas treatment method for preparing DL-homocystine of the present invention adopts an oxidation absorption liquid to respectively make dimethyl disulfide generate colorless and odorless dimethyl sulfoxide, and sulfur dioxide generate sulfuric acid, thereby fundamentally The emission of toxic and unpleasant gases is eliminated, and at the same time, even if the used oxidation absorption liquid enters the Fenton oxidation unit operation of the sewage treatment system, the toxic gases will not overflow 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] [0004] The document J.Biol.chem,99; 135-142 firstly proposed a method for the synthesis of homocystine: heating methionine and excess sulfuric acid to prepare homocysteine. This method has been used until now. There is a by-product sulfur dioxide 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: [0005] [0006] At present, the treatment of tail gas in the industrial route is all focused ...

Claims

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Application Information

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Patent Type & Authority Patents(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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