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Method for controlling byproduct anisole in diphenyl carbonate production

A technology of diphenyl carbonate and anisole, which is applied in the field of controlling the by-product anisole of diphenyl carbonate production, can solve the problems of direct pollution discharge and the inability to effectively control the generation of by-product anisole, etc., and achieve increased revenue, The effect of reducing production costs

Pending Publication Date: 2020-04-03
四川中蓝国塑新材料科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at how to provide a method for controlling and recovering the by-product anisole in the industrial production of diphenyl carbonate in the prior art, it solves the problem that the generation of the by-product anisole cannot be effectively controlled and the direct discharge causes pollution in the existing production process question

Method used

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  • Method for controlling byproduct anisole in diphenyl carbonate production
  • Method for controlling byproduct anisole in diphenyl carbonate production

Examples

Experimental program
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Effect test

Embodiment 1

[0029] (1). During the actual operation of the device, in the reaction of 3t / h dimethyl carbonate and 6.4t / h phenol in the esterification tower, the reaction temperature is controlled at 200°C, and the catalyst concentration is 80ppm-100ppm for esterification reaction to obtain MPC. MPC is disproportionated In the reaction tower, the reaction temperature is controlled at 180°C, the catalyst concentration is 750ppm-800ppm, and the residence time is controlled for 5h, and the disproportionation reaction is carried out to obtain diphenyl carbonate. At the same time, the degreasing reaction of MPC produces anisole as a by-product, and the formation rate is 50kg / h .

[0030] (2). The anisole waste liquid produced after the anisole mixed liquid at the top of the disproportionation reaction tower passes through the anisole removal tower of the device is sent to such as figure 1 In the shown rectification tower 1, under the pressure of 25kPa, the reflux ratio of the control tower is 1...

Embodiment 2

[0032] (1). During the actual operation of the device, in the reaction of 3t / h dimethyl carbonate and 6.4t / h phenol in the esterification tower, the reaction temperature is controlled at 200°C, and the catalyst concentration is 80ppm-100ppm for esterification reaction to obtain MPC. MPC is disproportionated In the reaction tower, the reaction temperature is controlled at 180°C, the catalyst concentration is 700ppm-750ppm, and the residence time is controlled for 5h, and the disproportionation reaction is carried out to obtain diphenyl carbonate. At the same time, the degreasing reaction of MPC produces anisole as a by-product, and the formation rate is 49kg / h .

[0033] (2). The anisole waste liquid produced after the anisole mixed liquid at the top of the disproportionation reaction tower passes through the anisole removal tower of the device is sent to such as figure 1 In the shown rectification tower 1, under the pressure of 20kPa, the reflux ratio of the control tower is 1...

Embodiment 3

[0035] (1). During the actual operation of the device, in the reaction of 3t / h dimethyl carbonate and 6.4t / h phenol in the esterification tower, the reaction temperature is controlled at 200°C, and the catalyst concentration is 80ppm-100ppm for esterification reaction to obtain MPC. MPC is disproportionated In the reaction tower, the reaction temperature is controlled at 180°C, the catalyst concentration is 730ppm-760ppm, and the residence time is controlled for 5h, and the disproportionation reaction is carried out to obtain diphenyl carbonate. At the same time, the degreasing reaction of MPC produces anisole as a by-product, and the formation rate is 51kg / h .

[0036] (2). The anisole waste liquid produced after the anisole mixed liquid at the top of the disproportionation reaction tower passes through the anisole removal tower of the device is sent to such as figure 1 In the rectification tower 1 shown, under the pressure of 28kPa, the reflux ratio of the control tower is 1...

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Abstract

The invention belongs to the technical field of diphenyl carbonate production, and particularly relates to a method for controlling a byproduct anisole in diphenyl carbonate production. The method forcontrolling the byproduct anisole in diphenyl carbonate production comprises the steps: A, controlling generation of anisole: controlling the concentration of a catalyst for diphenyl carbonate production to be 700 ppm-800 ppm, wherein the average residence time of a disproportionation reaction material for diphenyl carbonate production is 5 h; and B, recovering anisole: controlling anisole in a diphenyl carbonate production system to be less than 2%, and discharging part of anisole in the system when the concentration of anisole in the system reaches 2%. According to the method, the generation rate of anisole is obviously reduced, and the generation of anisole can be effectively controlled.

Description

technical field [0001] The invention belongs to the technical field of diphenyl carbonate production, and in particular relates to a method for controlling anisole, a by-product of diphenyl carbonate production. Background technique [0002] The synthesis of diphenyl carbonate by transesterification method adopts dimethyl carbonate and phenol to carry out transesterification to obtain, and the reaction principle is as follows: [0003] [0004] DMC and phenol are transesterified to produce intermediate methyl phenyl carbonate MPC, MPC and phenol are further reacted to generate DPC, or two molecules of MPC undergo disproportionation reaction to generate DPC and DMC, and the generated DMC can be used as a raw material to continue the reaction. MPC produces anisole as a side reaction. [0005] In the existing process, the generation of by-product anisole cannot be effectively controlled, resulting in a decrease in the selectivity of the target product and an increase in pro...

Claims

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Application Information

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IPC IPC(8): C07C68/06C07C69/96C07C43/205C07C41/42
CPCC07C68/06C07C41/42C07C69/96C07C43/205
Inventor 龙升全曾毅唐川辜凯德王公应张利李强汪伟羊德文雷守国
Owner 四川中蓝国塑新材料科技有限公司
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