Preparation method of 1,1-diphenyl ethane

A technology of diphenylethane and dichloroethane, which is applied in the field of preparation of 1,1-diphenylethane, can solve the problems of process pollution, catalyst can not be reused, low yield, etc., and achieve low process pollution , Environmentally friendly catalytic process, high yield effect

Inactive Publication Date: 2016-03-23
LIAONING PETROCCHEM VOCATIONAL & TECH COLLEGE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The introduction of ionic liquid into the reaction of 1,1-diphenylethane as a catalyst can overcome the disadvantages of low yield, non-reusable catalyst and serious process pollution in the existing synthesis method

Method used

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  • Preparation method of 1,1-diphenyl ethane
  • Preparation method of 1,1-diphenyl ethane
  • Preparation method of 1,1-diphenyl ethane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] With benzene 281.2g (3.6mol), ionic liquid catalyst triethylamine hydrochloride-aluminum trichloride [Et 3 NHCl-AlCl 3 ] 10g was added to the reaction bottle, and 59.4g (0.6mol) of 1,1-dichloroethane was added dropwise to the reaction system at a uniform speed at 40°C, and the drop was completed in 3 hours, and then the temperature was raised to 50°C for 1.5 hours.

[0028] After the reaction is finished, the temperature of the reaction system is first lowered to room temperature, then the reaction solution is allowed to stand for stratification, and the upper organic phase is separated, and the organic phase is washed with water and alkali to neutrality, and then the excess benzene is recovered by distillation to obtain 1, The crude product of 1-diphenylethane is collected by rectification at 126-129℃ / 8mmHg to obtain 1,1-diphenylethane.

Embodiment 2

[0030] With benzene 37.5g, ionic liquid catalyst triethylamine hydrochloride-zinc chloride [EtN 3 HCl-ZnCl 2 ] 10g was added to the reaction bottle, and 2.5g of 1,1-dichloroethane was added dropwise to the reaction system at a uniform speed at 80°C, and the drop was completed in 2 hours, and continued for 1 hour.

[0031] After the reaction is finished, the temperature of the reaction system is first lowered to room temperature, then the reaction solution is allowed to stand for stratification, and the upper organic phase is separated, and the organic phase is washed with water and alkali to neutrality, and then the excess benzene is recovered by distillation to obtain 1, The crude product of 1-diphenylethane is collected by rectification at 126-129℃ / 8mmHg to obtain 1,1-diphenylethane.

Embodiment 3

[0033] With benzene 98g, ionic liquid catalyst chloride 1-butyl-3-methylimidazole-aluminum trichloride [BMIMCl-AlCl 3 ] 2g was added to the reaction bottle, and 1,1-dichloroethane 100g was added dropwise to the reaction system at a uniform speed at 0°C, and the drop was completed in 4 hours, and continued for 2 hours.

[0034] After the reaction is finished, the temperature of the reaction system is first lowered to room temperature, then the reaction solution is allowed to stand for stratification, and the upper organic phase is separated, and the organic phase is washed with water and alkali to neutrality, and then the excess benzene is recovered by distillation to obtain 1, The crude product of 1-diphenylethane is collected by rectification at 126-129℃ / 8mmHg to obtain 1,1-diphenylethane.

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Abstract

The present invention discloses a preparation method of 1,1-diphenyl ethane. The preparation method comprises the following steps: using ionic liquid as a catalyst, and reacting benzene with 1,1-dichloroethane for 3-6 hours at 0-80 DEG C; and synthesizing 1,1-diphenyl ethane, wherein the precursor compound of the ionic catalyst is selected from pyridinium halide, imidazolium halide, trialkylamine halide and quaternary ammonium salt. The preparation method has the beneficial effects that the synthesis process is simple, the yield is high, and the process pollution is low. The catalytic activity of the ionic liquid used in the preparation method disclosed by the present invention is high without adding any other auxiliary agent or organic agent; and the used ionic liquid is free of pollution to the environment, and after the reaction, the ionic liquid can be separated and recovered conveniently and can be reused, so that the environmentally-friendly catalytic process is realized.

Description

technical field [0001] The present invention relates to the field of organic synthesis, in particular to a method for preparing 1,1-diphenylethane. Background technique [0002] In recent years, the rapid development of all-film power capacitors has put forward higher requirements for power capacitor impregnants. The physical and chemical properties such as viscosity, aromaticity, and freezing point of the insulating medium directly affect its electrical performance, which in turn affects the efficient and safe use of power capacitors. 1,1-Diphenylethane is one of the important components of high-end power capacitor insulating liquids SAS-40 and SAS-70. Compared with (M / DBT), its outstanding advantages are high aromaticity, low viscosity, and low freezing point, so it is an ideal impregnant for full-film capacitors. [0003] At present, the synthesis methods of 1,1-diphenylethane are mainly divided into three types: acetaldehyde method, styrene method and phenylethyl alcoh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C2/86C07C15/16
CPCY02P20/52C07C2/861
Inventor 杨连成席宁陈明陈海波
Owner LIAONING PETROCCHEM VOCATIONAL & TECH COLLEGE
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