Method of separating chlorinated aliphatic hydrocarbons with 1 to 3 carbon atoms from mixtures thereof by extractive distillation
US4036703A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 17, 1976 |
| Grant date | Jul 19, 1977 |
| Priority date | — |
| Expiry date | Jun 17, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C17/386
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method of partially or totally separating chlorinated aliphatic C.sub.1 to C.sub.3 hydrocarbons from mixtures of at least two of the chlorinated hydrocarbons by extractive distillation. The mixture of the chlorinated hydrocarbons is distilled in the presence of one or more third organic compounds having a boiling point higher than that of the substances to be separated, selected from the group comprising methyl, ethyl, normal propyl and isopropyl mono and di-chloroacetates; benzyl alcohol; salicylaldehyde, benzaldehyde, n-heptanal, methylisobutylketone, tetramethylurea, .gamma.-butyrolactone; normal propyl, isopropyl, normal, secondary and tertiary butyl acetylacetates; diethyl oxalate, dimethyl succinate and preferably methyl and ethyl acetylacetates; acetic anhydride, N-formyl-morpholine, 2-chloro ethanol, hexamethylphosphotriamide, dimethyl sulphate and normal tributyl and triisobutyl phosphates. This method is particularly applicable to separation of mixtures of 1,1,1-trichloro ethane and 1,2-dichloro ethane; trichloroethylene and 1,2-dichloro ethane; perchloroethylene and 1,1,2-trichloro ethane; and carbon tetrachloride and 1,2-dichloro ethane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.