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Of methanol and acetic acid , methyl acetate synthesis reaction is a reversible reaction , methyl acetate , methanol and water will form a binary or ternary azeotrope, and therefore very difficult to obtain high-purity methyl acetate . Methyl acetate synthesis process computer simulation and process optimization , and system test , the use of the combined process of extractive distillation and catalytic reaction method , 98% concentrated sulfuric acid as a catalyst , acetic acid and methanol as raw materials successfully prepared using a tower purity ≥ 99.5% of methyl acetate, methyl acetate conversion rate gt; 99.9%. Of equilibrium stage model simulated methyl acetate synthesis process . Application of rigorous the distillation model RadFrac, thermodynamic equations chosen for Mixtures of methyl acetate NRTL equation , the system examines the whole tower series , reflux ratio , feed location, the impact of acid to alcohol feed ratio on the reactive distillation process ; the process is optimized , preliminary to obtain optimum operating conditions : the theoretical stage of the reactive distillation column 45 , the feed location of the methanol , sulfuric acid, acetic acid , respectively 40 , 20 and 10 ( overhead condensate for a tower reactor for the first 45 ) , a reflux ratio of 1.2 , methanol / acetic acid ( mol ) = 1.2 , the sulfuric acid / acetic acid ( wt ) = 0.01 . Design a inner diameter of Φ125/Φ140 and about 16 meters high methyl acetate synthesis reaction distillation column ( 6 -meter-high corrugated wire packing 40 CTST trays composite tower) Experimental study of the coking plant in Shanghai , testing tower stable operation , convenient adjustment and stable production of a purity of ≥ 99.5 % of methyl acetate , methyl acetate highest purity of up to 99.64% , the conversion rate of acetic acid gt ; 99.9 % , and the temperature distribution , overhead , and the bottom of each group concentration test results are in good agreement with the simulation results . Preliminary design work for the completion of the annual output of 20,000 tons of methyl acetate technology package . Reactive distillation column height of 42.7 meters , the CTST tray , 78 diameter Φ1200/Φ1600 .
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