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Method for continuously diphenyl carbonate

A technology of diphenyl carbonate and dimethyl carbonate, which is applied in the field of continuous production of phenylethyl carbonate, can solve the problems of low yield of diphenyl carbonate and low conversion rate of dimethyl carbonate, etc.

Active Publication Date: 2013-06-19
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the problems of low dimethyl carbonate conversion rate and low diphenyl carbonate yield in the prior art, and propose a method for preparing diphenyl carbonate that can carry out high yield and continuous production in a stable manner. Methods

Method used

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  • Method for continuously diphenyl carbonate

Examples

Experimental program
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Effect test

Embodiment 1

[0031]In a process device mainly composed of a reactive distillation tower, a phenyl acetate separation tower and a diphenyl carbonate separation tower, the raw materials dimethyl carbonate and phenyl acetate are prepared under the action of catalyst butyl titanate to produce dicarbonate phenyl esters.

[0032] The reactive distillation tower is a plate tower with a diameter of 300mm and a height of 16000mm, with 30 trays inside; the phenyl acetate separation tower is a packed tower with a diameter of 300mm and a height of 12000mm, with structured packing inside, and the number of theoretical plates is 40; The diphenyl ester separation tower is a packed tower with a diameter of 200mm and a height of 8000mm, with structured packing inside, and the number of theoretical plates is 20.

[0033] Reactive distillation column operating conditions:

[0034] Raw material dimethyl carbonate enters the lower part of the reactive distillation column at a rate of 9kg / h, phenyl acetate is ...

Embodiment 2

[0038] In a process device mainly composed of a reactive distillation tower, a phenyl acetate separation tower, and a diphenyl carbonate separation tower, the raw materials dimethyl carbonate and phenyl acetate are produced under the action of a catalyst dibutyltin oxide Diphenyl carbonate.

[0039] The reactive distillation tower is a packed tower with a diameter of 300 mm and a height of 30,000 mm, with a built-in structured packing of 25 m and a theoretical plate number of 80;

[0040] Reactive distillation column operating conditions

[0041] The catalyst is dibutyltin oxide (dissolved in phenyl acetate in advance), and the feed amount of raw materials and catalyst is the same as in Example 1. The reflux ratio at the top of the tower is 2, the temperature at the bottom of the tower is 216-219°C, and the temperature at the top of the tower is 62-64°C. The discharge amount at the top of the tower is 13.6kg / h, and it is composed of methyl acetate, which is discharged outsid...

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Abstract

The invention relates to a method for continuously diphenyl carbonate. The main step is as follows: preparing diphenyl carbonate by reacting and rectifying raw materials of dimethyl carbonate and phenylacetate with existence of catalyst. According to the inventive method, almost all dimethyl carbonate is converted into diphenyl carbonate, the invention has the advantages of high conversion rate (over 99%), high diphenyl carbonate yield (over 95%), low energy consumption, simple technique and the like, can continuously and efficiently prepare diphenyl carbonate, which no doubt brings good development prospect and enormous economic benefit for industries of diphenyl carbonate and even polycarbonate.

Description

technical field [0001] The invention belongs to the field of chemical reaction engineering, relates to a production method of diphenyl carbonate, more specifically, relates to a method for continuously producing phenylethyl carbonate. Background technique [0002] Diphenyl carbonate (DPC) is a very versatile organic carbonate, which can be used to synthesize many organic intermediates. DPC itself is non-toxic and non-polluting. It is an important green and environmentally friendly chemical product. It can synthesize many organic compounds and polymer materials through reactions such as halogenation, nitration, hydrolysis, and ammonolysis, such as monoisocyanate, diisocyanate, and polycarbonate. , polyparaben, polyaryl carbonate, etc. It can also be used as a plasticizer for polyamide and polyester, a high-boiling point organic solvent, and a heat carrier. In recent years, with the development of environmentally friendly synthesis of high-quality polycarbonate using DPC and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C69/96C07C68/06C07C68/08
CPCY02P20/10
Inventor 方云进范海平
Owner EAST CHINA UNIV OF SCI & TECH