Hydrochloric Acid → 1,1-Dichloroethane

1,1-Dichloroethane and hydrogen fluoride were introduced into an inconel-made reactor filled with a catalyst (mainly comprising trivalent chromium oxide) and reacted at a reaction temperature of 250° C., the resulting reaction gas, mainly comprising 1,1-difluoroethane, hydrogen chloride and unreacted hydrogen fluoride, was introduced into a first distillation tower, hydrogen chloride which is a low boiling fraction was mainly separated from the top, and hydrogen fluoride, 1,1-difluoroethane, 1,1-dichloroethane and 1-chloro-1-fluoroethane were mainly separated from the bottom and introduced into a second distillation tower. In the second distillation tower, crude 1,1-difluoroethane mainly comprising 1,1-difluoroethane was obtained from the top and hydrogen fluoride, 1,1-dichloroethane and 1-chloro-fluoroethane were mainly separated from the bottom and recirculated to the above-described reaction step. The obtained crude 1,1-difluoroethane had the following composition.

1. customreacted at a reaction temperature of 250° C.
2. customwas mainly separated from the top, and hydrogen fluoride, 1,1-difluoroethane, 1,1-dichloroethane and 1-chloro-1-fluoroethane
3. customwere mainly separated from the bottom and
4. additionintroduced into a second distillation tower

ORD-Eintrag

ord-74034e474fee411a9c9ba94262a0b2c1

Quelldatensatz

uspto-grants-2010_04

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07696392B2