Multiple Help The Catalytic Carbonylation Of Methanol To Methyl Formate

Synthesization methyl formate(MF) from carbonylation of methanol under the multi-promoter system is studied in this paper.The aim is at to solve the problem brought by the single catalyzer sodium methoxide(MeOJVa).The influence of A, B, C to carbonylation is also examined. At last, the best promoter-system is given, reaction mechanism is discussed, improved and optimized suggestions to moderate-scale are brought forward also.Mix A, B, C promoters to form AB, BC, AC binary-promoter-system and ABC three fold-promoter-system. At temperature of 80 , CO pressure of 3.8MPa, the MeONa concentration of 0.4mol/L, the total promoters concentration of 2mol/L,the influence of different promoter-system on synthesize MF is discussed in detail.At the circumstance of A:B=1:1,possess the best catalysis among the binary-promoter-system. In this system,the conversion of methanol can reach 73%. At the three fold-promoter-system, the conversion of methanol can reach 74. 6%, is great higher than both the single promoter-system and the binary-promoter-system.After analysing the results of experiments, the mechanism of catalyzers is discussed. And the catalysis of promoter-system is illustrated also.After comparing the relationship between the space-time yield(STY) and reaction time, suggestions are given to the moderate-scale. The optimum reaction condition is at temperature of 80 , CO pressure 3.8MPa, the MeONa concentration of 0.4mol/L,at the use of three fold-promoter-system(A:B:C=l:l:l,total concentration of 2mol/L), reaction time of 170min, intermission time of 90min.In this condition, the ratio of facility utilization can reach 65.4%, yield can reach 423t/a, more 123t/a than what it is now.