Study On Ethyl Acrylate Synthesized By Carbonylation Of Acetylene At Highe Pressure

At present the mainstream of acrylic ester production process is propylene oxidation and subsequent esterification process, in recent years with the petroleum based propylene prices soaring up, the manufacturing cost became overwhelming unacceptable. Our country is relatively a coal and gas rich nation, and we have a rapid development of coal chemical technology, and the process of using gas to manufacture acetylene have improved a lot. Therefore, using acetylene carbonylation as a substitute to produce ethyl acrylate can fully exert the special advantage of China’s resource.This paper illustrates the study of acetylene carbonylation to manufacture ethyl acrylate at high pressure, selects high-efficiency main and promoter catalysts,explores the optimical main technological conditions that has influence on the reaction results,calculates and analyses the reaction thermodynamics.The experiment shows that,using nickel bromide as main catalyst, III and IV as cocatalyst, acetone as co-solvent and internal standard substance, amount of main catalyst0.87wt%(total mass of liquid), Ⅲ and Ⅳ0.71wt%and3.62%,n(acetylene):n(ethanol)=1:2.2, reaction time1.25h,reaction pressure5.5MPa,reaction temperature230℃, add conduit, semi-continuous operational way,stirring speed1200r/min, the selectivity of acetylene reaches97.24%,the yield of ethyl acrylate reaches87.89%, the selectivity of ethanol reaches93.26%.Product is golden yellow transparent, no coke exists, and insoluble III is conducive to separation, cocatalyst IV is partially esterified to ethyl acrylate in the catalytic process, thus reduces the impurities of the reaction liquid, which is conducive to the subsequent separation.