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Method for preparing methanesulfonic acid by recycling byproduct, namely hydrochloric acid

A technology of methanesulfonic acid and by-product hydrochloric acid, which is applied in the fields of sulfonic acid preparation, organic chemistry, manganese halide, etc., can solve the problems of restricting the normal production of methanesulfonyl chloride and methanesulfonic acid, poor sales of hydrochloric acid, and restriction of by-products The use of hydrochloric acid and other problems, to achieve the effect of reducing production costs, eliminating constraints, and realizing recycling

Active Publication Date: 2014-03-19
湖北星火(应城)化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because there is a small amount of sulfide in the by-product hydrochloric acid, the by-product hydrochloric acid has an odor, which limits the use of by-product hydrochloric acid
Moreover, the sales of by-product hydrochloric acid are affected by the seasons. In the slow-moving season, due to poor sales of hydrochloric acid, the normal production of methanesulfonyl chloride and methanesulfonic acid is seriously restricted.
The same problem also exists in other projects that produce hydrochloric acid by-products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A method for recycling by-product hydrochloric acid to prepare methanesulfonic acid, the steps are as follows:

[0039]①. Add 250kg of dimethyl disulfide and 500kg of by-product hydrochloric acid of methanesulfonic acid with a concentration of 37% into the two enamel reaction kettles respectively, pass brine into the jacket, cool down to 15°C, and set aside. A condenser and a falling film absorber are installed in the tail gas pipeline of the reactor to purify and absorb by-product hydrochloric acid.

[0040] Put 10,000kg of hydrochloric acid, a by-product of 37% methanesulfonic acid, into the 15m 3 In the reaction tank, start stirring, pass water vapor into the tank, and heat to 50°C. Slowly add manganese dioxide to the pool. After the tail gas is condensed by the graphite condenser, it is passed through the buffer tank from the bottom of one of the enamel reaction kettles into the dimethyl disulfide aqueous emulsion. The feed rate of manganese dioxide and the circu...

Embodiment 2

[0047] 1., add 300kg dimethyl disulfide and 600kg respectively in two enamel reaction kettles from the concentration of embodiment one and be the by-product hydrochloric acid of 37% methanesulfonic acid, pass into brine in the jacket, be cooled to 15 ℃, stand-by. A condenser and a falling film absorber are arranged in the tail gas pipeline of the reactor to purify and absorb by-product hydrochloric acid; the 4.2% dilute hydrochloric acid solution collected in Example 1 is added to the absorption tank.

[0048] The by-product hydrochloric acid 4700kg of the methanesulfonic acid of embodiment one 37% and the 37% by-product hydrochloric acid of 5300kg potassium sulfate industry are dropped into 15m 3 In the reaction tank, start stirring, pass water vapor into the tank, and heat to 40°C.

[0049] Slowly add manganese dioxide to the pool. After the tail gas is condensed by the graphite condenser, it is passed through the buffer tank from the bottom of one of the enamel reaction k...

Embodiment 3

[0055] ①, to 15m 3 Put 10,000kg of 37% methanesulfonic acid and potassium sulfate into the reaction tank to produce hydrochloric acid, and heat it to 40°C with steam.

[0056] ②. Put 550kg of dimethyl disulfide and 500kg of potassium sulfate into the enamel reaction kettle to produce 37% concentrated hydrochloric acid by-product, and cool to 20°C.

[0057] ③. Slowly add 2500kg manganese dioxide to 15m 3 In the reaction pool, turn on the steam, slowly raise the temperature to 90°C, cool the reaction tail gas through the graphite condenser, and then pass it into the enamel kettle filled with dimethyl disulfide through the buffer tank.

[0058] ④, 7 hours later, to 15m 3 The reaction tank is supplemented with 2 tons of 37% by-product hydrochloric acid, and the temperature in the tank is maintained at 60°C-90°C to continue the reaction; after 15 hours, the manganese dioxide feeding is completed.

[0059] ⑤, sampling analysis, dimethyl disulfide reaction is complete....

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PUM

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Abstract

The invention relates to a method for preparing methanesulfonic acid by recycling a byproduct, namely hydrochloric acid. The method is characterized in that a method of hydrogen chloride, chlorine gas, methanesulfonic acid and hydrogen chloride is adopted, and the byproduct, namely the hydrochloric acid is recycled in the preparation process of the methanesulfonic acid to prepare the methanesulfonic acid. The method has the advantages that the byproduct, namely the hydrochloric acid is adopted for preparing chlorine gas and directly reacted with dimethyl disulfide, so that the safety risk and the logistics cost in purchase, transportation and storage of the chlorine gas with severe toxicity can be avoided; the byproduct, namely the hydrochloric acid, which is difficult to sell can be locally digested and utilized, and turned into treasure, so that the byproduct, namely the hydrochloric acid becomes a main raw material for preparing the methanesulfonic acid and the recycling of chlorine element is realized. Simultaneously, leftover manganese dioxide waste after oxidation reaction of potassium permanganate is utilized to prepare manganese chloride, and the manganese chloride can be used for electrolytic manganese, so that the production cost and the safety risk of the methanesulfonic acid are greatly reduced, and two major restricting factors, namely the chlorine gas and the byproduct, namely the hydrochloric acid in the preparation method of the methanesulfonic acid are simultaneously eliminated.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for preparing methanesulfonic acid by recycling by-product hydrochloric acid. Background technique [0002] Methanesulfonic acid is an important intermediate of organic medicine and pesticide, which is very important in the synthesis of fomesafen and other pesticides and cephalosporins. At the same time, methanesulfonic acid is still the main raw material of the most widely used electronic electroplating. At present, the common method of producing methanesulfonic acid is the hydrolysis process of methanesulfonyl chloride. The process uses dimethyl disulfide and chlorine to carry out wet oxidation to obtain methanesulfonyl chloride, which is hydrolyzed to obtain methanesulfonic acid. [0003] Among them, the wet oxidation process of methanesulfonyl chloride adopts chlorine gas and dimethyl disulfide in water emulsion to carry out chlorine oxidation reaction. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C309/04C07C303/02C01G45/06
Inventor 曾丹田汪志君
Owner 湖北星火(应城)化工有限公司
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