Production of diphenyl carbonate by triphosgene or solid phosgene

A technology of diphenyl carbonate and solid phosgene, applied in the preparation of organic carbonate, organic chemistry and other directions, can solve the problems of low yield of diphenyl carbonate, damage to catalyst activity, long process flow, etc., and achieves process environmental protection, The effect of reducing equipment and installation manufacturing costs and increasing space-time efficiency

Inactive Publication Date: 2007-11-21
赵云
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The phosgene method technology is mature, but highly toxic phosgene is used. In order to prepare high-quality diphenyl carbonate, phosgene must be liquefied to purify it, and liquefied phosgene is more dangerous
And, the free chlorine in phosgene and the organic chlorine that generates with phenol can cause huge damage to the activity of the catalyst that polycarbonate uses, because diphenyl carbonate is crystallized in sodium phenoxide solution in the production of diphenyl carbonate by phosgene method, Sodium phenol is inevitably entrained, so the yield of diphenyl carbonate is not high, only 91%-92%. The lost phenol is washed and discharged by washing water. It can only be discharged after biochemical treatment, and the treatment is not good. cause environmental pollution
The quality of diphenyl carbonate is good by transesterification with dimethyl carbonate and phenol, but at present there are reasons such as low yield in one step, long process flow and immature technology.

Method used

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  • Production of diphenyl carbonate by triphosgene or solid phosgene

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0016] Organic phase: 20 kg of solid phosgene in 100 liters

[0017] Water phase: 100 liters contains 38 kg of phenol, 16.5 kg of sodium hydroxide (100%), and an appropriate amount of catalyst.

[0018] Reactor: The structure is as above, see attached drawing. The mixer added at the front end has a throttling mixer with back-mixing and dispersing functions. The main body of the tubular reactor is a serpentine tube with an inner diameter of 8mm, and the length of the tube is 200 meters. .5, 5 intervals are connected in series with tapered sharp-hole pipe fittings with an inner diameter of 1.5mm to achieve the purpose of fully mixing two-phase materials. The total volume of the pipe system is only 10 liters, and the annual production capacity can reach 150 tons of diphenyl carbonate. The space-time efficiency is 15 tons / M 3 .Hour.

[0019] Synthesis: The above-mentioned materials are dosed according to the volume flow ratio of 1:1, continuously input into the reactor under th...

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Abstract

Production of diphenyl carbonate from trichloromethyl-carbonate ester adopts tubular reactor to increase contact effect and has more yield.

Description

technical field [0001] The invention relates to a method for preparing diphenyl carbonate by using bis(dichloromethyl)carbonate (commonly known as triphosgene or solid phosgene). Background technique [0002] Diphenyl carbonate is an organic compound that can be used as a raw material for polycarbonate, as well as for p-hydroxybenzoic acid polyester, monoisocyanate, diisocyanate and as a plastic plasticizer. In addition, it is used as a solvent and heat carrier in chemical production . [0003] The production method of known diphenyl carbonate mainly contains the transesterification method of phosgene method phenol sodium salt method and dimethyl carbonate and phenol. The phosgene method technology is mature, but highly toxic phosgene is used. In order to prepare high-quality diphenyl carbonate, phosgene must be liquefied to make it purified, and liquefied phosgene is more dangerous. And, the free chlorine in phosgene and the organochlorine that and phenol generate can cau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C68/06C07C69/96
Inventor 赵云赵中赵燕
Owner 赵云
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