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 noblemetal 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 present 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, the use of coal or natural gas to replace petroleum ethylene to synthesize ethylene glycol is a major C1 chemical technology with the most scientific raw material route, the most reasonable resource utilization, and significantly better than the petroleum route. As an important intermediate product, the synthesis of oxalate is of great significance to my country's strategic goal of "replacement of 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 fine chemicals to prepare various dyes, medicines, important solvents, extractants and various intermediates. [0003] The...

AI Technical Summary

Problems solved by technology

In recent years, many scholars at home and abroad have made some progress in the selection of catalysts, activity and carrier effects, and process operating conditions. However, the use of noble metal Pd as the active component of the catalyst increases the production cost of oxalate.