Process for the continuous preparation of mono- or di-(trichloromethyl)-benzenes
US4056455A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 1, 1976 |
| Grant date | Nov 1, 1977 |
| Priority date | — |
| Expiry date | Jul 1, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C17/14
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Continuous preparation of mono- or di-(trichloromethyl)-benzenes or of mono- or di-(trichloromethyl)-benzenes substituted in the benzene ring by halogen atoms from the corresponding mono- or dimethylbenzenes and chlorine in several steps with radiation by means of rays of high energy, is effected by reacting mono- or dimethylbenzene with chlorine in 4 to 14 steps, at a temperature in the range of from 20.degree. to 130.degree. C, whereby chlorine is introduced into the second step and the following steps, the resulting waste gas is introduced into step 1 and chlorine contained in the waste gas is reacted in reactor 1 with fresh mono- and dimethylbenzene. A preferred embodiment for carrying out the process is reaction in a reactor arrangement in cascade form, wherein the number of steps corresponds to the number of reactors and wherein as reactors circulation reactors are used.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.