Preparation method of oxalate by CO gas phase coupling synthesis using regular catalyst

Abstract

The invention relates to a preparation method of oxalate by CO gas phase coupling synthesis using a regular catalyst. In the method, a fixed bed reactor is adopted, a catalyst bed consists of a regular structural catalyst loaded with noble metal; CO and vaporized nitrite are introduced into a reactor for reacting on the regular catalyst so as to generate the oxalate at the conditions that the pressure is 0.1-2MPa, the reaction temperature is 80-200 DEG C, and N2 is taken as a carrier gas, wherein the volume ratio of the materials is as follows: N2:CO:nitrite is 20-80:5-60:10-40, and the retention time is 0.5-10 hours. The method of the invention improves mass transfer efficiency of the reaction materials between the gas phase and the solid phase or among the gas phase, the liquid phase and the solid phase, increases the contact area of the reaction materials and the catalyst and reduces the usage amount of the catalyst in the noble metal, wherein the usage amount of the catalyst noble metal Pd is saved by more than 86%. The method of the invention has the characteristics of high catalyst activity, low cost, convenient and fast replacement and the like, and is beneficial for realizing large-scale engineered application.

Description

technical field

[0001] The invention relates to the synthesis of oxalate, in particular to a production method for synthesizing oxalate by CO gas-phase coupling using a regular catalyst. Background technique

[0002] In view of the current situation of more coal and less oil in my country, using coal or natural gas instead of petroleum ethylene to synthesize ethylene glycol technology is a major C1 chemical technology with the most scientific raw material route and the most reasonable resource utilization, which is obviously superior to the petroleum route. Oxalate is one of the important intermediate products, and its synthesis is of great significance to the realization of my country's strategic goal of "replacing petroleum ethylene with coal or natural gas to synthesize ethylene glycol". In addition, oxalate is also an important organic chemical raw material, which is widely used in the fine chemical industry to prepare various dyes, medicines, important solvents, extract...