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Process for preparing dimethylsulfone

A technology of dimethyl sulfone and dimethyl sulfoxide, which is applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of limited production process means and failure to produce, and reduce production costs , stable control of process parameters, and simple process flow

Inactive Publication Date: 2003-12-10
田军
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it has been produced abroad, high-purity dimethyl sulfone has not been produced so far due to the limitation of its production technology and level. For the representative United States, it can be known from known documents that only the purity The indicator is set at 99.5% standard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] First, 236.8kg of dimethyl sulfone with a purity of ≥99.8% and a freezing point of 17.8°C is imported from the high-level tank into a reaction tank equipped with a stirrer and a jacket, and then 1.266 times its weight, that is, 299.4kg at normal temperature and Neutral purified tap water is poured into the tank and stirred to dilute evenly. During this period, cooling water is introduced into the jacket of the reaction tank to keep the temperature in the tank lower than 20°C. At the same time, the pH value of the diluent is measured. When it exceeds 6.0, add 65% dropwise. The concentration of nitric acid of reagent grade is such that the pH value of the dimethyl sulfone aqueous solution is within the range of 5-6. Under these conditions, the hydrogen peroxide, which is equivalent to about 1.566 times the weight of dimethyl sulfoxide, which is about 370.8kg, with a concentration of 27.5% and an acidity of ≤0.01%, is slowly injected into the storage tank at a flow rate of ...

Embodiment 2

[0042] First, 236.8kg of dimethyl sulfone with a purity of ≥99.8% and a freezing point of 17.8°C is imported from the high-level tank into a reaction tank equipped with a stirrer and a jacket, and then 1.266 times its weight, that is, 300kg at normal temperature and in the form of Neutral purified tap water is poured into the tank and accompanied by stirring to uniformly dilute, during which the jacket of the reaction tank is fed with cooling water to keep the temperature in the tank below 20°C, and the pH value of the diluent is measured at the same time. When it exceeds 6.0, add 65% dropwise The concentration of nitric acid of reagent grade is such that the pH value of the dimethyl sulfone aqueous solution is within the range of 5-6. Under these conditions, slowly inject hydrogen peroxide, which is equivalent to 1.567 times the weight of dimethyl sulfoxide (about 371.1kg), with a concentration of 27.5%, and an acidity of ≤0.01%, at a flow rate of 2.8-3.0 liters per minute for...

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Abstract

A process for preparing dimethyl sulfone includes the oxidizing reaction between dimethyl sulfoxide and H2O2 in neutral water at 22+ / -2 deg.C for 60 min to generating the mixed liquid containing dimethyl sulfone crystal, centrifugal dewatering, refining, drying and sieving. Its advantages include high total output rate (85%) and high purity (more than) 99.9%.

Description

technical field [0001] The invention relates to a method for producing dimethyl sulfone, which belongs to the process of preparing chemical substances [0002] technology field. Background technique [0003] Methyl sulfonyl methane is used as a base material for beauty and health care medicines to promote wound healing, repair scars, make human skin shiny and elastic, and treat arthritis. It has been widely used in the fields of medicine, health care and beauty . Although it has been produced abroad, high-purity dimethyl sulfone has not been produced so far due to the limitation of its production technology and level. For the representative United States, it can be known from known documents that only the purity The indicator is set at 99.5% standard. Contents of the invention [0004] Aiming at the defects of the existing production technology that is difficult to produce higher-purity dimethyl sulfone, the present invention innovatively designs a method for producing ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C315/00C07C317/04
Inventor 田军
Owner 田军