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Method for preparing trimethyl borate at high conversion rate

A technology of trimethyl borate and high conversion rate, which is applied in the field of synthesizing trimethyl borate with high conversion rate, can solve the problems of high energy consumption and low conversion rate, and achieve the effect of simple process, high-efficiency conversion, and easy industrial production

Inactive Publication Date: 2015-04-01
DALIAN UNIV OF TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] The present invention aims at the problems of low conversion rate and high energy consumption existing in the existing industrial production technology of trimethyl borate, and provides an economical, environmental protection, simple operation and high conversion rate method for preparing trimethyl borate

Method used

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Effect test

Embodiment 1

[0016] Get 100g of boric acid, 240g of methanol and a conversion agent containing 1.5mol of boron atoms, and put them into a 1L reactor. Heat the reactor and start stirring at the same time. After the temperature of the reaction system reaches 80°C, keep the temperature constant. After 2 hours of reaction, carry out distillation, and collect the fractions at 50-60°C and 60-100°C; Extractive distillation obtains trimethyl borate. During the reaction between boric acid and methanol, the conversion rate of boric acid was 80%, and the conversion rate of methanol was 51%.

Embodiment 2

[0018] Take 100g of boric acid, 300g of methanol and a conversion agent containing 1.6mol of boron atoms, and put them into a 1L reactor. Heat the reactor and start stirring at the same time, make the temperature of the reaction system reach 75°C and keep the temperature constant. After reacting for 0.5h, distill the product and collect the fractions at 50-60°C and 60-100°C; The distillate at ℃ was subjected to extractive distillation to obtain trimethyl borate. During the reaction between boric acid and methanol, the conversion rate of boric acid was 85%, and the conversion rate of methanol was 42%.

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Abstract

The invention belongs to the technical field of chemical industry, and relates to a method for synthesizing trimethyl borate at high conversion rate. The method comprises the following steps: putting boric acid, methanol and a conversion agent into a reactor, stirring and heating to 60-120 DEG C, continuing stirring for 0.5-2 hours while keeping the temperature, distilling, collecting 50-60 DEG C and 60-100 DEG C fractions, and recycling the residual conversion agent in the reactor; and carrying out extraction rectification on the 50-60 DEG C fraction to obtain the trimethyl borate. The method solves the problems of low conversion rate, high energy consumption and the like in reaction between boric acid and methanol in the traditional trimethyl borate preparation technique. The whole preparation process is simple in reaction procedure and easy to control, and has obvious competitive edges and profit margins.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and relates to a method for synthesizing trimethyl borate with high conversion rate. technical background [0002] Trimethyl borate is an important boron-containing organic compound, mainly used as organic solvent, dehydrating agent, plasticizer, catalyst and flame retardant, and also used in other boron-containing organic compounds (advanced borate ester and sodium borohydride, etc.) , Preparation of high-purity boron for optoelectronics and high-purity boric acid for nuclear power. [0003] Preparation method of trimethyl borate: mainly react boron-containing inorganic substances (any one of boron trichloride, boron trifluoride, boric anhydride, metaboric acid, pyroboric acid, boric acid and borax) with methanol to obtain trimethyl borate -Methanol azeotrope, then add extractant to the azeotrope to carry out extraction and rectification to obtain trimethyl borate. Among the above-men...

Claims

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Application Information

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IPC IPC(8): C07F5/04
CPCC07F5/04
Inventor 田朋宁桂玲庞洪昌叶俊伟贡卫涛林源
Owner DALIAN UNIV OF TECH
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