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Purification process of methane methanedisulfonate

A technology of methylene disulfonate and dimethyl carbonate, which is applied in the direction of organic chemistry, can solve the problems of complex process, low purification efficiency, and low purity of methylene disulfonate, and achieve simple process and purified product The effect of high purity

Inactive Publication Date: 2019-07-19
泰兴华盛精细化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are few studies on the purification process of methylene disulfonate, and the purification efficiency is low. The obtained methylene disulfonate has low purity and complicated process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A purification process of methylene disulfonate, comprising the following steps:

[0018] Step 1: Dissolving, the methylene disulfonate crude product and dimethyl carbonate are dissolved at 1:2;

[0019] Step 2: filtering, filtering through a precision filter to remove insoluble matter;

[0020] Step 3: Stir, add 3-4 times the quality of water to the filtrate in Step 2, and stir for 1 hour;

[0021] Step 4: the product is obtained, the filtrate after stirring in step 3 is allowed to stand for stratification, and the organic phase of the lower layer is removed and evaporated to dryness to obtain a high-purity methylene disulfonate product.

Embodiment 2

[0023] A purification process of methylene disulfonate, comprising the following steps:

[0024] Step 1: Dissolving, the methylene disulfonate crude product is dissolved in 1:1 with dimethyl carbonate;

[0025] Step 2: filtering, filtering through a precision filter to remove insoluble matter;

[0026] Step 3: Stir, add 2 times the quality of water to the filtrate in Step 2, and stir for 0.5 hours;

[0027] Step 4: the product is obtained, the filtrate after stirring in step 3 is allowed to stand for stratification, and the organic phase of the lower layer is removed and evaporated to dryness to obtain a high-purity methylene disulfonate product.

Embodiment 3

[0029] A purification process of methylene disulfonate, comprising the following steps:

[0030] Step 1: Dissolving, dissolving the crude methylene disulfonate and dimethyl carbonate at 1:3;

[0031] Step 2: filtering, filtering through a precision filter to remove insoluble matter;

[0032] Step 3: Stir, add 5 times the quality of water to the filtrate in Step 2, and stir for 1.5 hours;

[0033] Step 4: the product is obtained, the filtrate after stirring in step 3 is allowed to stand for stratification, and the organic phase of the lower layer is removed and evaporated to dryness to obtain a high-purity methylene disulfonate product.

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PUM

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Abstract

The invention discloses a purification process of methane methanedisulfonate. The purification process comprises the following steps: step 1, dissolving, namely dissolving crude methane methanedisulfonate and dimethyl carbonate; step 2, filtering, namely filtering with a precision filter to remove insolubles; step 3, stirring, namely adding water into the filtrate in the step 2, and starting stirring; step 4, preparing the product, namely allowing the filtrate after being stirred in the step 3 to stand for layering, taking a lower organic phase, and evaporating to dryness to obtain the high-purity methane methanedisulfonate product. The high-purity methane methanedisulfonate can be obtained by dissolving, filtering, stirring and standing for layering, and the purification process has the advantages of simple process and high purity of a purified product.

Description

technical field [0001] The invention relates to the field of methylene disulfonate, in particular to a purification process of methylene disulfonate. Background technique [0002] Methylene disulfonate (MMDS) is suitable for power batteries, especially power batteries with lithium manganate as the positive electrode material. It can prevent the Mn melted out at high temperature from being adsorbed on the surface of the negative electrode, inhibit the increase in impedance, and effectively improve the cycle time. characteristics, can greatly increase its cycle life. In addition, methylene disulfonate can be used as a pharmaceutical intermediate. [0003] At present, there are few studies on the purification process of methylene disulfonate, and the purification efficiency is low. The obtained methylene disulfonate has low purity and complicated process. Contents of the invention [0004] The object of the present invention is just to provide a kind of purification process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D327/00
CPCC07D327/00
Inventor 林刚吴毅杰万保坡许金来许磊于辉
Owner 泰兴华盛精细化工有限公司