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In N,N-dimethyl-formamide; at 190℃; under 1125.11 Torr; for 70h;
Preparation of catalysts: Cu(NO3)2.3H2O, Zn(NO3)2.6H2O, Al(NO3)3.9H2O: 190.3g, 330.5g, 198.6g were respectively weighed out and 0.7 mol/L aqueous solutions were respectively prepared and mixed to obtain mother liquors. ; Weigh 285.4g Na2CO3 dubbingA 0.7 mol/L aqueous solution was added dropwise to the mother liquor, the precipitate was filtered, dried at 120 C., pulverized to 200 mesh, calcined at 450 C., and then graphite-bearing was added to form a Phi3*3Cu-Zn-Al catalyst. The weight ratio of the catalyst was determined. It is: CuO:ZnO:Al2O3=35%:50%:15%.The molar ratio of <strong>[126-33-0]<strong>[126-33-0]sulfolan</strong>e</strong>, dimethylformamide, urea, and n-butanol is 1:3:1:5, and the reaction material solution is prepared. The catalyst loading is 40 ml.The reaction is carried out in a continuous flow fixed bed with a liquid space velocity of 1.5 h-1.CO2 airspeed is 1400h-1, reaction temperature is 190C, reaction pressure is 0.15MPa,Reaction time 70h. The urea conversion was 98.6% and the dibutyl carbonate yield was 89.4%.
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