DIMETHYL ETHER RECOVERY Russian patent published in 2006 - IPC C07C43/04 C07C41/06 

FIELD: organic chemistry, chemical industry in particular distillation of organic substance mixtures.

SUBSTANCE: dimethyl ether of high purity is obtained from reaction mixtures in process of synthesis of dimethyl ether from carbon oxide, carbon dioxide and hydrogen, or simultaneous synthesis of dimethyl ether with methanol, or methanol dehydration. Dimethyl ether in recovered from reaction mixture in distillation column under pressure with dimethyl ether discharge. Dissolved gases are removed in stripping column before feeding into distillation column. Pressure in stripping column is maintained in limits of 7-31 ata. As stripping column plate-type column or packed column is used. In packed column conditions sufficient for phase inversion are maintained. Dimethyl ether is discharged in form of distillate and/or in form of upper side cut with or without admixture discharge.

EFFECT: decreased carbon dioxide content in finished product, increased dimethyl ether yield.

5 cl, 7 tbl, 4 dwg, 6 ex