Co-catalytic method for obtaining improved chlorination of phenols
US4160114A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 20, 1977 |
| Grant date | Jul 3, 1979 |
| Priority date | — |
| Expiry date | Jul 20, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C37/62
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
In a process for producing relatively pure commercially acceptable pentachlorophenol, comprising reacting, at a temperature ranging from about 10.degree. to about 190.degree. C., (A) a phenol consisting essentially of raw or commercial phenol which may contain, as impurities from other processes, some lower chlorophenols such as mono and dichlorophenols and mixtures thereof, and (B) chlorine, in the presence of (C) an acid catalyst from about 0.005 moles to about 0.016 moles per mole of (A) used, consisting essentially of aluminum chloride, ferric chloride, metal iron, aluminum tributoxide, antimony chloride, metallic antimony, stannous chloride, metallic tin, cuprous chloride and metallic copper; the improvement consisting of using (D) a sulfur containing co-catalyst selected from the group consisting of sulfur, thiophenol, para-chlorothiophenol, para, para'-dichlorophenyl sulfide, sodium hydrosulfide, 2,2'-thiobis (4,6-dichlorophenol) benzyl disulfide, dibenzothiophenol, benzyl-disulfide, diphenyl sulfide, diphenyl disulfide, di-isopentyl sulfide, naphthalene thiol, heptyl sulfide, hexochlorophenyl sulfide, dicresyl disulfide, dihexadecyl sulfide and dibenzothiophenol thiophenol,…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.