FIELD: chemical engineering. SUBSTANCE: extractive rectification involves dimethylformamide as extractive agent in complex column provided with side section, productivity of principal column being 34 t.t the and that of side section 19 t.t. and phlegm numbers 0.41-0.42 and 2.8-5.8, respectively. Principal column and side section distillates are commercial acetone and chloroform, respectively. Bottom product is dimethylformamide. EFFECT: reduced power consumption and increased purity of products. 1 tbl
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