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Method for preparing diphenyl carbonate through transesterification

A technology of diphenyl carbonate and dimethyl carbonate is applied in the field of preparing diphenyl carbonate by transesterification, and can solve the problems of heterogeneous catalyst activity, low selectivity, easy deactivation and the like

Inactive Publication Date: 2016-01-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the prior art has the problems of heterogeneous catalyst activity, low selectivity, and easy deactivation, and a new method for preparing diphenyl carbonate by transesterification is provided

Method used

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  • Method for preparing diphenyl carbonate through transesterification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh 9.0gSnCl 2 2H 2 O and 38.1gGa(NO 3 ) 3 Dissolve in 500mL water, add 300mL aqueous solution containing 29.3g anhydrous sodium carbonate to it, collect the obtained precipitate, wash with deionized water 3 times, each time 1000mL, and dry the obtained precipitate in an oven at 120°C for 24 hours , fired at 600°C for 5 hours to obtain SnO 2 / Ga 2 o 3 Mixed oxide catalyst MO-1, in which SnO and Ga 2 o 3 The parts by weight are respectively 30 parts and 70 parts.

Embodiment 2～15

[0022] The mixed metal oxide catalyst obtained is shown in Table 1 by changing the type and amount of mixed metal salts and precipitants used, and keeping the rest of the conditions unchanged.

[0023] Table 1

[0024]

Embodiment 16

[0026] Take by weighing 10g of the MO-1 catalyst prepared by the above [Example 1] and place it in a 300mL stainless steel reactor, add N 2 Replace the air in the reaction kettle, then fill with 50.0g phenyl acetate and 14.1g dimethyl carbonate, heat up to 175°C, cool after 5 hours of reaction, carry out chromatographic analysis to the reaction product, obtain the conversion of dimethyl carbonate (DMC) The yield was 87.9%, the selectivity of diphenyl carbonate (DPC) was 46.5%, and the selectivity of methylphenyl carbonate (MPC) was 52.9%.

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Abstract

The invention relates to a method for preparing diphenyl carbonate through transesterification. With prior arts, heterogeneous catalyst activity and selectivity are low, and the catalyst is prone to inactivation. The invention mainly aims at solving the above problems. According to the invention, dimethyl carbonate and phenyl acetate are adopted as raw material, and contact a catalyst for 1-20h under a reaction temperature of 120-190 DEG C, wherein a molar ratio of dimethyl carbonate to phenyl acetate is 0.1-5, and a weight ratio of the catalyst to phenyl acetate is 0.01-0.5. With the above reaction, diphenyl carbonate is produced. The catalyst is a binary mixed metal oxide AaOb / BcOd, wherein A is Sn, Mn or Bi; and B is Al, Ga, Fe, In, Zr or Cr. With the technical scheme, the problems are well solved. The method can be used in industrial productions for preparing diphenyl carbonate through the transesterification reaction of dimethyl carbonate and phenyl acetate.

Description

technical field [0001] The invention relates to a method for preparing diphenyl carbonate by transesterification. Background technique [0002] Diphenyl carbonate is a raw material for the preparation of polycarbonate by non-phosgene method. The traditional preparation method is phosgene method, which is subject to policy restrictions due to the potential harm of highly toxic phosgene to the environment and safe production. Synthesis of diphenyl carbonate (DPC) by transesterification of phenol (PhOH) and dimethyl carbonate (DMC) under the action of a catalyst is currently the only industrialized non-phosgene synthesis route of diphenyl carbonate. However, this route has the problems of low equilibrium conversion and high energy consumption for the separation of DMC and methanol azeotrope. The route of transesterification between dimethyl carbonate and phenyl acetate (PA) to generate diphenyl carbonate has the advantages of high equilibrium conversion rate, no azeotropic com...

Claims

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Application Information

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IPC IPC(8): C07C69/96C07C68/06B01J23/14B01J23/843B01J23/34B01J23/889B01J23/18
Inventor 陈梁锋何文军
Owner CHINA PETROLEUM & CHEM CORP
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