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Method for purifying methylbenzene for microelectronic industry

A purification method and technology for industrial toluene, applied in distillation purification/separation, adsorption purification/separation, inorganic chemistry, etc., can solve the problems of low degree of impurity removal, long processing time, unstable product quality, etc., and achieve the cost of auxiliary materials. The effect of reducing, reducing the amount

Inactive Publication Date: 2010-04-21
北京益利精细化学品有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The quality of the product is unstable, the degree of removal of impurities is high and low, and the process is not easy to master
[0005] 2. The processing process takes a long time. The batch production of the equipment is calculated on the scale of 1 ton. It takes 6 hours to pickle three times, more than 1.5 hours to wash with alkali, more than 1.5 hours to wash with water, more than 12 hours to dry, and more than 24 hours to distill. more than 45 hours

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] 800-1000 kilograms of toluene raw materials are sucked in a slanted hole tower with a tower body of 25 layers and a tower diameter of 219 millimeters with a capacity of 1500 liters, and 40 kilograms of high-efficiency adsorbent—activated clay (its composition is added) from the hand hole. : SiO 2 80%, Ca, Mg, Fe each about 4%, other 8%), heat, reflux, fractionate the moisture contained in the raw material toluene and the adsorbent, if it contains a small amount of benzene, it will also be steamed out earlier thereupon. Mainly control the outflow speed of each time period for operation, and control the outflow speed of 5 liters / hour in the head (head fraction discharge stage). After the water is discharged (the effluent changes from mixed to clear and transparent, indicating that the water has been discharged), increase the outflow speed to 15-25 liters / hour, and start to produce finished products until the amount of residual toluene in the kettle accounts for about 5% o...

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PUM

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Abstract

The invention discloses a method for purifying methylbenzene for microelectronic industry, which comprises the following steps: pumping industrial methylbenzene into rectification equipment; and adding an absorbent in a ratio of 20-40:1 of the methylbenzene to the absorbent, namely, adding 25 to 50 kilograms of absorbent into every 1,000 kilograms of methylbenzene for rectification, wherein the absorbent is carclazyte comprising the following components in percent by weight: 80 to 82 percent of silicon dioxide, 3 to 5 percent of calcium, 3 to 5 percent of magnesium, 3 to 5 percent of iron and 6 to 9 percent of other components.

Description

technical field [0001] The invention relates to a method for purifying organic chemical raw materials, in particular to a method for purifying toluene used in the microelectronics industry. Background technique [0002] Industrial toluene is obtained from the fractionation of coal tar or the aromaticization of petroleum. The impurities mainly include benzene, xylene, methylthiophene and other sulfides or nitrides, and olefins. Toluene used in the electronics industry must remove the above impurities. [0003] In order to achieve the purpose of purification, most manufacturers adopt the method of concentrated sulfuric acid washing, that is, mixing and stirring sulfuric acid and raw material toluene, so as to achieve the purpose of washing raw material toluene with sulfuric acid, wherein the ratio of sulfuric acid to raw material toluene is 6-7:1, each time The mixing and stirring time is 1 to 2 hours. According to the amount of impurities in the toluene, generally repeat the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/06C07C7/04C07C7/12B01J20/10
Inventor 刘殿莹郭存林赵玉峰杨秀玉
Owner 北京益利精细化学品有限公司