Preparation method of diaryl carbonate

Abstract

The invention relates to a preparation method of diaryl carbonate, comprising the step of carrying out oxidative carbonylation on phenols and carbon monoxide and oxygen to synthesize diaryl carbonate, in particular to synthesize diphenyl carbonate by phenol. The method is characterized in that a catalytic system consisting of a metal halide catalyst together with one or more N-containing heterocyclic compounds used as a support catalyst is adopted, thereby increasing the conversion rate, selectivity and yield of the catalytic reaction.

Description

technical field

[0001] The present invention relates to a method for preparing diaryl carbonate, which is to synthesize diaryl carbonate by oxidative carbonylation reaction of phenols, carbon monoxide and oxygen, especially to synthesize diphenyl carbonate from phenol. Background technique

[0002] Diphenyl carbonate (DPC) is an organic compound with low toxicity and no pollution, and is an intermediate of important engineering plastics. It can be used in many important organic compounds and polymer materials such as monoisocyanate, diisocyanate, polycarbonate, polyparaffin Synthesis of methyl hydroxybenzoate, polyaryl carbonate, etc. It can also be used as a plasticizer and solvent for polyamide and polyester.

[0003] In recent years, with the development of a non-phosgene synthesis method to synthesize high-quality polycarbonate (PC) using diphenyl carbonate and bisphenol A as raw materials, diphenyl carbonate has become a particularly attractive compound. The production...

Examples

Embodiment 1-5

[0031] Repeat the steps of comparative example, but add different organic cocatalysts, and make the mol ratio of organic cocatalyst and catalyst be 1: 1, the result is as shown in table 1, and table 1 shows that when palladium chloride catalyst is matched with different cocatalysts , the yields were all increased to varying degrees.

[0032] Table 1 palladium chloride is collocated with different co-catalysts to the raising effect of diphenyl carbonate productive rate

[0033]

[0034] Example 2

Embodiment 6-7

[0036] Repeat the step of comparative example, but use different palladium chloride concentrations, the promotor added is 3,6-dibromocarbazole, and its molar ratio with catalyst is 1: 1, and the result is as shown in table 2, table 2 It was shown that under different palladium chloride catalyst concentrations, co-catalysts were all helpful to the formation of diphenyl carbonate.

[0037] Table 2 co-catalyst is collocated with the influence of palladium halide of different concentrations on the synthesis of diphenyl carbonate

[0038]

Embodiment 8

[0040] Repeat the step of comparative example, but react under different reaction pressures, the promotor added is 3, the 6-dibromocarbazole, the result is as shown in table 3, and table 3 shows that after adding promotor of the present invention, Under different pressures, it can still maintain a higher productivity than the original system.

[0041] Table 3 The influence of pressure on the generation of diphenyl carbonate

[0042]

technical field

[0001] The present invention relates to a method for preparing diaryl carbonate, which is to synthesize diaryl carbonate by oxidative carbonylation reaction of phenols, carbon monoxide and oxygen, especially to synthesize diphenyl carbonate from phenol. Background technique

[0002] Diphenyl carbonate (DPC) is an organic compound with low toxicity and no pollution, and is an intermediate of important engineering plastics. It can be used in many important organic compounds and polymer materials such as monoisocyanate, diisocyanate, polycarbonate, polyparaffin Synthesis of methyl hydroxybenzoate, polyaryl carbonate, etc. It can also be used as a plasticizer and solvent for polyamide and polyester.

[0003] In recent years, with the development of a non-phosgene synthesis method to synthesize high-quality polycarbonate (PC) using diphenyl carbonate and bisphenol A as raw materials, diphenyl carbonate has become a particularly attractive compound. The production...

Examples

Embodiment 1-5

[0031] Repeat the steps of comparative example, but add different organic cocatalysts, and make the mol ratio of organic cocatalyst and catalyst be 1: 1, the result is as shown in table 1, and table 1 shows that when palladium chloride catalyst is matched with different cocatalysts , the yields were all increased to varying degrees.

[0032] Table 1 palladium chloride is collocated with different co-catalysts to the raising effect of diphenyl carbonate productive rate

[0033]

[0034] Example 2

Embodiment 6-7

[0036] Repeat the step of comparative example, but use different palladium chloride concentrations, the promotor added is 3,6-dibromocarbazole, and its molar ratio with catalyst is 1: 1, and the result is as shown in table 2, table 2 It was shown that under different palladium chloride catalyst concentrations, co-catalysts were all helpful to the formation of diphenyl carbonate.

[0037] Table 2 co-catalyst is collocated with the influence of palladium halide of different concentrations on the synthesis of diphenyl carbonate

[0038]

Embodiment 8

[0040] Repeat the step of comparative example, but react under different reaction pressures, the promotor added is 3, the 6-dibromocarbazole, the result is as shown in table 3, and table 3 shows that after adding promotor of the present invention, Under different pressures, it can still maintain a higher productivity than the original system.

[0041] Table 3 The influence of pressure on the generation of diphenyl carbonate

[0042]

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