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Process for producing aromatic carbonate on commercial scale

A kind of aromatic carbonate, aromatic technology, applied in the field of industrial preparation of aromatic carbonate, can solve the problems of undisclosed mass production, undocumented suggestions and the like

Active Publication Date: 2007-05-30
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, in all the existing documents proposing the preparation of aromatic carbonates by these reactive distillation methods, there is no specific method or device that can be mass-produced on an industrial scale (for example, more than 1 ton per hour), and there is no description advice on them

Method used

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  • Process for producing aromatic carbonate on commercial scale

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0172]

[0173] The raw material 1 containing phenol / dimethyl carbonate=1.9 (mass ratio) was continuously introduced in a liquid state at a flow rate of 50 ton / hr from the upper inlet of the distillation column. Raw material 1 contained 0.3% by mass of methanol, 0.9% by mass of methylphenyl carbonate, 0.4% by mass of diphenyl carbonate, and 7.3% by mass of anisole. On the other hand, a raw material 2 containing dimethyl carbonate / phenol=3.6 (mass ratio) was continuously introduced in a gaseous state at a flow rate of 50 ton / hr from the lower inlet of the distillation column. The raw material 2 contained 0.2 mass % of methanol, 1.1 mass % of methyl phenyl carbonate, and 5.1 mass % of anisole. The molar ratio of the raw material introduced into the distillation column was dimethyl carbonate / phenol=1.35. All the raw materials introduced into the distillation column contained 0.25% by mass of methanol, 1.0% by mass of methylphenyl carbonate, 0.2% by mass of diphenyl carbonate a...

reference example 1

[0178] The implementation of this reference example was carried out before Example 1. Use the fresh raw material that does not contain methyl alcohol, methyl phenyl carbonate, diphenyl carbonate, anisole, and the continuous multi-stage distillation column identical with embodiment 1, and carry out continuously under the same conditions as embodiment 1 Reactive distillation. After 24 hours, a stable steady-state operation can be achieved. The liquid continuously drawn from the bottom of the column contained 18.2% by mass of methylphenyl carbonate and 0.8% by mass of diphenyl carbonate. It can also be seen that the production capacity of methyl phenyl carbonate per hour is 9.1 tons, and the production capacity of diphenyl carbonate per hour is 0.4 tons. The overall selectivity of methylphenyl carbonate and diphenyl carbonate to reacted phenol was 99%. And after 50 hours, 100 hours, and 200 hours, stable operation was performed in exactly the same state.

Embodiment 2

[0180] Using the same continuous multistage distillation column as in Example 1, reactive distillation was carried out under the following conditions.

[0181] The raw material 1 with phenol / dimethyl carbonate=1.1 (mass ratio) was continuously contained in a liquid state at a flow rate of 40 ton / hr from the upper inlet of the distillation column. The raw material 1 contained 0.3 mass % of methanol, 1.0 mass % of methyl phenyl carbonate, and 5.6 mass % of anisole. On the other hand, a raw material 2 containing dimethyl carbonate / phenol=3.9 (mass ratio) was continuously introduced in a gaseous state at a flow rate of 43 ton / hr from the lower inlet of the distillation column. The raw material 2 contained 0.1 mass % of methanol, 0.2 mass % of methyl phenyl carbonate, and 4.4 mass % of anisole. The molar ratio of the raw material introduced into the distillation column was dimethyl carbonate / phenol=1.87. All the raw materials introduced into the distillation column contained 0.2%...

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Abstract

It is an object of the present invention to provide a specific process that enables an aromatic carbonate to be produced with high selectivity and high productivity stably for a prolonged period of time on an industrial scale of no less than 1 ton per hour using a continuous multi-stage distillation column from a dialkyl carbonate and an aromatic monohydroxy compound containing specified amounts of an alcohol and an aromatic carbonate. Although there have been many proposals regarding the process of producing the aromatic carbonate using a reactive distillation method, these have all been on a small scale and a short operating time laboratory level. There have also been no disclosures whatsoever of a starting material containing necessary amounts of the alcohol and the aromatic carbonate for use in an industrial production, which have been considered to be disadvantageous in terms of the equilibrium, let alone the process and apparatus for the industrial production. According to the present invention, there is provided a specified continuous multi-stage distillation column, and there is also provided a specific process that enables the aromatic carbonate to be produced with high selectivity and high productivity stably for a prolonged period of time on an industrial scale of not less than 1 ton per hour from the dialkyl carbonate and the aromatic monohydroxy compound containing the alcohol and the aromatic carbonate.

Description

technical field [0001] The invention relates to an industrial preparation method of aromatic carbonate. More specifically, the present invention relates to a process for transesterification of dialkyl carbonate and aromatic monohydroxy compound in the presence of a catalyst in a continuous multistage distillation column, and thereby industrially mass-produces A method for producing aromatic carbonates from polycarbonate raw materials. Background technique [0002] Aromatic carbonates are important raw materials for the preparation of aromatic polycarbonates, which are many engineering plastics most in demand, without the use of toxic phosgene. As a method for producing aromatic carbonates, a method of reacting an aromatic monohydroxy compound with phosgene has been known, and various studies have been conducted recently. However, this method has the problem of using phosgene, and there are chlorine-based impurities that are difficult to separate in the aromatic carbonate p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C68/06B01D3/14C07C69/96C07B61/00
CPCC07C68/06B01D3/14Y02P20/10C07C69/96
Inventor 福冈伸典八谷广志松崎一彦
Owner ASAHI KASEI KK