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Purification method of byproduct methanol in industrial production of diphenyl carbonate

A technology of diphenyl carbonate and a purification method, which is applied in the field of purification of by-product methanol in the industrial production of diphenyl carbonate, can solve problems such as inability to realize industrial separation, and achieve the effects of simple operation, reduced investment scale, and reduced cost

Pending Publication Date: 2020-04-28
四川中蓝国塑新材料科技有限公司 +1
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: to provide a method for purifying the by-product methanol of diphenyl carbonate industrial production, to solve the problem that the by-product methanol in the production process contains dimethyl carbonate, and the azeotropic system composed of these two substances cannot be realized The problem of industrial separation

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  • Purification method of byproduct methanol in industrial production of diphenyl carbonate

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Embodiment 1

[0024] Pass the mixture of methanol and dimethyl carbonate obtained in the industrial production of diphenyl carbonate into the methanol refining tower for atmospheric distillation, control the pressure in the methanol refining tower to ≤0.02MPa, control the temperature of the kettle liquid to 68°C, and the reflux ratio Be 7; The mass ratio of methyl alcohol and dimethyl carbonate is the azeotrope component of 93%:7%;

Embodiment 2

[0026] Pass the mixture of methanol and dimethyl carbonate obtained in the industrial production of diphenyl carbonate into the methanol refining tower for atmospheric distillation, control the pressure inside the methanol refining tower to ≤0.02MPa, control the temperature of the kettle liquid to 68.5°C, and the reflux ratio Be 8; The mass ratio of methyl alcohol and dimethyl carbonate is the azeotrope component of 93%:7%;

Embodiment 3

[0028] Pass the mixture of methanol and dimethyl carbonate obtained in the industrial production of diphenyl carbonate into the methanol refining tower for atmospheric distillation, control the pressure in the methanol refining tower to ≤0.02MPa, control the temperature of the kettle liquid to 68°C, and the reflux ratio Be 7; The mass ratio of methyl alcohol and dimethyl carbonate is the azeotropic component of 87%:13%;

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Abstract

The invention belongs to the field of chemical engineering, and particularly relates to a purification method of byproduct methanol in industrial production of diphenyl carbonate. The method comprisesthe following steps: forming an azeotropic mixture from methanol and dimethyl carbonate in a mass ratio of (87-93%): (7-13%), introducing the azeotropic mixture into an atmospheric tower for atmospheric distillation, and controlling the pressure in the atmospheric distillation tower to be less than or equal to 0.02 MPa, the kettle liquid temperature to be 68-68.5 DEG C and the reflux ratio to be7-8; and collecting tower bottom distillate to obtain purified methanol. The purification method of the byproduct methanol in industrial production of diphenyl carbonate is simple and convenient to operate, an extracting agent is not required to be added, the cost is reduced, and the purity of the separated methanol is high and reaches up to 99.8%.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a method for purifying by-product methanol in the industrial production of diphenyl carbonate. Background technique [0002] Synthesis of diphenyl carbonate (DPC) by transesterification is obtained by transesterification between dimethyl carbonate (DMC) and phenol. The transesterification reaction between dimethyl carbonate and phenol is divided into two steps: the first step is to generate methyl Phenyl carbonate, the second step is to obtain diphenyl carbonate after methyl phenyl carbonate is further reacted with phenol. The existing diphenyl carbonate production devices in my country all use the phosgene method, and the production capacity is low. Domestic production of diphenyl carbonate by transesterification has only established small-scale and pilot-scale equipment, and has not formed industrialized mass production. [0003] The existing main problems in the ...

Claims

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Application Information

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IPC IPC(8): C07C29/80C07C31/04C07C68/08C07C69/96
CPCC07C29/80C07C68/08C07C31/04C07C69/96
Inventor 张利龙升全傅利才王公应曾毅李强周国平羊德文唐川王焱锋
Owner 四川中蓝国塑新材料科技有限公司
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