The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 06, 1976
Filed:
Mar. 26, 1974
Heinz Rassaerts, Hallenin-Rif, Sbg, OE;
Gerhard Sticken, Lippramsdorf, DT;
Wilhelm Knepper, Marl, DT;
Abstract
A process for preparing trichloroethylene by chlorinating 1,2-dichloroethane in the liquid phase in the presence of ethylene followed by pyrolytic chlorination or dehydrochlorination of the reaction product. The 1,2-dichloroethane is chlorinated in the liquid phase in a bubble column reactor in the presence of 1 - 10 mole percent of ethylene with a chlorine/1.2-dichloroethane feed ratio of about 0.7 - 1.4/1, a temperature of about 40.degree. to 150.degree.C with superficial velocities exceeding 8 cm/sec. and gas dwell times of about 0.3 to 10 seconds. The chlorinated product is reacted in the gas phase with recirculated tetrachloroethanes and about 20 - 70 moles of chlorine per 100 moles of chlorinated hydrocarbons at temperatures of about 380.degree. to 500.degree.C and dwell times of about 20 to 30 seconds. This gas phase reaction product is separated by distillation into a low-boiling fraction containing predominantly dichloroethylenes and a high boiling fraction containing predominantly trichloroethylene. The low boiling fraction is reacted in the liquid phase with equimolar amounts of chlorine at temperatures of about 60.degree. - 150.degree.C to obtain the tetrachloroethanes that are recirculated. The high boiling fraction is then separated by distillation into the trichloroethylene product and higher boiling point side products.