Method for separating dimethyl oxalate and dimethyl carbonate with low energy consumption
A technology of dimethyl oxalate and dimethyl carbonate, which is applied in chemical instruments and methods, preparation of carboxylate, purification/separation of carbonate/haloformate, etc., can solve problems such as clogging and reduce methanol Concentration, avoiding clogging and fouling, and reducing energy consumption
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[0084] use figure 1 In the system for separating dimethyl oxalate and dimethyl carbonate with low energy consumption, the coupling reaction product flow contains DMO concentration of 18.7% (mass percentage, the same below), DMC concentration of 3.3%, methanol concentration of 7%, and the rest is nitrogen, MN , NO, CO and other components, after heat exchange, the temperature is lowered to 94°C and enters the alcohol washing tower. The operating pressure at the top of the alcohol washing tower is 3.3 atm; The side line outlet, the condensation area in the lower part of the alcohol washing tower adopts a large-aperture sieve plate, the number of theoretical plates is 5, and the upper absorption area of the alcohol washing tower adopts wire mesh corrugated packing, the number of theoretical plates is 10; the top condensate and supplementary methanol are sprayed from the top of the tower, The spray density is 2.5t / m 2 h, spray methanol in the upper absorption zone of the alcoho...
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