Load type solid body base catalyst of synthesizing dimethyl carbonate and method of preparing the same

Abstract

The invention relates to a carrier type solid base catalyst for synthesizing dimethyl carbonate, which belongs to the technical field of catalytic material. The catalyst's formula is KF / M<2+>-N<3+>-(O), wherein M<2+>-N<3+>-(O) represents the composite metal oxide, M<2+> can be divalent metal ion (Mg<2+> or Ca<2+> ) and N<3+> can be trivalent metal ion (Fe<3+> and / or Al<3+>). The catalyst is prepared from potassium fluoride and composite metal oxide at a certain weight ratio by immersing the potassium fluoride into the composite metal oxide, wherein the composite metal oxide is prepared from hydrotalcite precursor and in nucleation / crystallization isolation method by calcining at a certain temperature. The catalyst has the advantages of nanoscaled particle size, high specific surface area and high activity, selectivity in catalytic reaction and simple preparation, and can be reused as it can be centrifugally separated after reacting.

Description

technical field [0001] The invention belongs to the technical field of catalytic materials, and in particular provides a supported solid base catalyst for synthesizing dimethyl carbonate (DMC) and a preparation method thereof. A supported solid base catalyst for synthesizing dimethyl carbonate and a preparation method thereof. Background technique [0002] Dimethyl carbonate (DMC) has lively chemical properties, excellent physical properties, and is non-toxic and easy to biodegrade. Electrolyte, bisphenol A polycarbonate monomers and carbonylation, methylation and carbonyl methoxylation reagents are widely used in the chemical and chemical fields. At present, countries are actively researching DMC-based environmentally friendly chemical raw materials. Green chemistry process. The industrial methods for synthesizing DMC mainly include methanol oxidative carbonylation and transesterification. Among them, the transesterification method has become a method with great industri...

AI Technical Summary

Problems solved by technology

[0005] Generally speaking, the transesterification reaction mostly uses alkali metal hydroxide, alkali metal carbonate and alkali metal alkoxide etc. Homogeneous catalyst, not suitable for separation from the product, difficult to reuse

Zhong Bing etc. (Chinese patent 01130469.3) the composite catalyst reaction activity that the phenolic resin of invention and alkaline earth metal carbonate forms is higher, and catalytic reaction speed is fast and reaction temperature is lower, and in 75ml autoclave, propylene carbonate (PC) And formaldehyde molar ratio is 1: 6, and catalyst consumption is 3%wt, and reaction temperature is 80 ℃, reacts 1 hour under stirring condition, and PC transformation rate is 52.9%, and DMC yield is 49.6%, but because this solid base has strong The basic site, the catalyst is easily destroyed by CO in the atmosphere 2 polluted

Wei Tong et al. (Chinese patent 02135213.5) used a composite catalyst formed of calcium fluoride and zirconia, which has excellent stability and can avoid CO 2 、H 2 Contaminated by impurities such as O, the reaction is in an autoclave, the molar ratio of methanol and propylene carbonate (PC) is 10:1, the catalyst consumption is 2%wt, and the reaction temperature is 150°C. After reacting for 1 hour under stirring conditions, PC is converted Yield 72.5%, DMC yield 68.9%, reactivity needs to be improved

Images