METHOD FOR PRODUCTION OF 1,1-DIFLUOROETHANE Russian patent published in 2017 - IPC C07C17/87 C07C17/20 C07C19/08 

FIELD: chemistry.

SUBSTANCE: invention refers to a method for production of 1,1-difluoroethane including liquid-phase fluorination of vinyl chloride by hydrogen fluoride in presence of tetrachlorated tin, distillation of fluorination products in presence of anhydrous hydrogen fluoride with taking in light fraction hydrogen chloride, raw 1,1-difluoroethane and partially hydrogen fluoride with hydrogen fluoride content from 0.3 to 3 mol.% and organic products boiling away at temperature which is higher than that for 1,2-difluoroethane (not more than 1 mol.%); high-boiling organic products and the greater hydrogen fluoride quantity is returned to fluorination stage. Rectification of the obtained fraction is used to isolate hydrogen chloride in the light fraction and raw 1,1-difluoroethane in still fraction. Additional removal of vinyl chloride from the still fraction is carried out in gas phase at a temperature in the range from 150 to 250°C by means of contact with aluminum oxide based catalyst with components of the group including chromium, nickel or antimony with subsequent isolation of the target product.

EFFECT: increased method efficiency.

3 cl, 2 tbl, 8 ex