METHOD OF PRODUCING 1,2-ALKYLENE CARBONATE Russian patent published in 2012 - IPC C07D317/36 C07C31/18 C07C29/128 C07C27/02 C07C68/06 C07C69/96 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing 1,2-alkylene carbonate and versions of the method of producing 1,2-alkylene diol and dialkylcarbonate using the obtained 1,2-alkylene carbonate. The method producing 1,2-alkylene carbonate involves (i) contacting carbon dioxide, 1,2-alkylene oxide and a carbonisation catalyst in a reactor to form a crude stream which flows from the reactor and contains carbon dioxide, light components, 1,2-alkylene carbonate and the catalyst; (ii) separating carbon dioxide and light components from the crude stream flowing from the reactor to form a lower stream containing 1,2-alkylene carbonate and catalyst; (iii) distilling the lower stream formed at step (ii) to obtain a first distillation upper stream containing 1,2-alkylene carbonate and light components and a first distillation lower stream containing a catalyst, and recycling at least a portion of the first distillation lower stream into the reactor and (iv) distilling the first distillation upper stream to form a second distillation upper stream containing light components and a second distillation lower stream containing 1,2-alkylene carbonate, and recycling at least a portion of the second distillation upper stream into the reactor.

EFFECT: method enables to obtain 1,2-alkylene carbonate which does not contain or almost does not contain impurities.

16 cl, 2 ex 1 tbl, 2 dwg