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Dehydrating method for organic solvent

A technology of organic solvents and water-organic solvents, applied in the field of dehydration of organic solvents, can solve problems affecting product quality and exceeding standards, and achieve low cost, simple operation and wide range of effects

Active Publication Date: 2014-11-19
ZHEJIANG ZHONGNING SILICON IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the production process, the water content in the organic solvent is very high and must be controlled below 500ppm. In practice, due to pollution, water leakage and other reasons, the water content in the organic solvent will exceed the standard, thus affecting product quality.

Method used

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  • Dehydrating method for organic solvent

Examples

Experimental program
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Effect test

example 1

[0041] Add 2000kg of ethylene glycol dimethyl ether containing 5% water into the reactor with agitator and condenser, slowly add 1100kg of 15% sodium aluminum tetrahydride solution, stir well and control the reaction temperature at about 40°C, Continue to react for 2 hours; feed 150kg of 95% silicon tetrafluoride gas, and continue to react for 1 hour; the slurry is delivered to a thin film evaporator, and the organic solvent is recovered to obtain 2650kg of ethylene glycol dimethyl ether, which contains The amount of water was 287ppm.

example 2

[0043] Add 3000kg of toluene and ethylene glycol dimethyl ether mixed solvent containing 1.5% water into the reactor with stirrer and condenser, slowly add 550kg of 13% sodium aluminum hydride solution, fully stir and control the reaction temperature at At about 40°C, continue to react for 5 hours; feed 30kg of 95% silicon tetrafluoride gas, and continue to react for 1 hour; transport the slurry to a thin film evaporator, recover the organic solvent in it, and obtain 3400kg of mixed solvent. After analysis, it contains The amount of water is 232ppm.

example 3

[0045] Add 1000kg of toluene with 3.5% water content into the reactor with agitator and condenser, slowly add 400kg of sodium aluminum tetrahydride solution containing 14%, stir well and control the reaction temperature at about 40°C, and continue the reaction for 5 hours; Introduce 25kg of 95% silicon tetrafluoride gas, and continue to react for 8 hours; transport the slurry to a vacuum evaporator, recover the organic solvent therein, and obtain 950kg of toluene and 330kg of ethylene glycol dimethyl ether. After analysis, the water contents were 189ppm and 248ppm respectively.

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Abstract

The invention discloses a dehydrating method for an organic solvent. In the method, a chemical reaction method is adopted. The method comprises the following steps: reacting a small amount of water in the organic solvent with a sodium aluminum hydride solution; transforming all the water in the organic solvent into harmless solid slurry; reacting the excessive sodium aluminum hydride with silicon tetrafluoride; and distilling and drying a reaction product to obtain an organic solvent of which the water content is less than 300ppm. By adopting the method, the problem that organic solvents produced in chemical production are polluted by water is solved completely. The dehydrating method has the advantages of low cost, easiness in operation, suitability for dehydrating production of organic solvents in chemical enterprises, and the like.

Description

technical field [0001] The invention relates to a dehydration method of an organic solvent, in particular to an anhydrous solvent obtained by reacting a sodium aluminum hydride solution with water, and belongs to the field of chemical solvent dehydration. Background technique [0002] Aromatic or / and aliphatic ether organic solvents, such as toluene, ethylene glycol dimethyl ether, etc., are indispensable materials in the production of silane special gas by the reduction method of silicon tetrafluoride. [0003] In the production process, the water content in the organic solvent is very high and must be controlled below 500ppm. In practice, due to pollution, water leakage and other reasons, the water content in the organic solvent will exceed the standard, thus affecting product quality. Therefore, it is very important to strictly control the water content of organic solvents. [0004] The present inventor researches this, and develops a kind of dehydration method of organi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/04C07C41/34C07C15/06C07C7/00
CPCC07C7/14833C07C41/44C07C43/10C07C15/06
Inventor 陈德伟孔祥云郑安雄廖敏
Owner ZHEJIANG ZHONGNING SILICON IND
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