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Showing papers on "Triphenyl phosphate published in 1966"


Patent
31 May 1966
TL;DR: In this article, a monochlorophenol containing a preponderating proportion of p-chlorophenol is prepared by converting phenol into triphenyl phosphate, chlorinating thetriphenyl phosphite with elementary chlorine and hydrolysing the product to remove the phosphate group.
Abstract: A monochlorophenol containing a preponderating proportion of p-chlorophenol is prepared by converting phenol into triphenyl phosphate, chlorinating the triphenyl phosphate with elementary chlorine and hydrolysing the product to remove the phosphate group. The hydrolysis may be effected with acid or alkaline reagents, some of which are specified, at atmospheric or raised pressure. Examples are given. Triphenyl phosphate for use in the process may be obtained by (1) reacting phenol with phosphorus trichloride, suitably at 70-150 DEG C. in a solvent, e.g. toluene, xylene or halogenated benzene, to yield triphenyl phosphite, which is then oxidized, e.g. with hydrogen peroxide, nitric oxide, sulphuric acid, persulphuric acid, vanadium oxide or barium peroxide, to yield triphenyl phosphate; or (2) reacting phenol with phosphorus oxychloride at 60-200 DEG C. without a solvent but in the presence of a catalyst, e.g. aluminium chloride, magnesium chloride, zinc chloride, phosphorus pentachloride or magnesium oxide. Chlorination products of triphenyl phosphate, for use in the process, are prepared by treating triphenyl phosphate with elementary chlorine either in the absence of a solvent at a temperature above 110 DEG C. or in the presence of a solvent, e.g. acetic acid, carbon tetrachloride or carbon disulphide, at - 10-100 DEG C. In either event, a chlorination catalyst may be present, e.g. ferric chloride, aluminium trichloride, antimony chloride, phosphorus chloride, sulphur chloride, bromine, iodine, sulphur, active carbon or activated clay.

3 citations


Patent
21 Dec 1966
TL;DR: In the manufacture of fiber-forming polyesters by esterifying terephthalic acid with polymethylene glycol containing 2-10 carbon atoms and polycondensing the resulting glycol ester or low molecular weight polymer thereof, there is used as esterification catalyst a compound containing manganese or cobalt in the form of an anion, e.g. potassium permanganate, sodium cobaltinitrite or a mixture thereof as mentioned in this paper.
Abstract: 1,147,239. Poly glycol terephthalates). COURTAULDS Ltd. 20 Dec., 1967 [21 Dec., 1966], No. 57165/66. Heading C3R. In the manufacture of fibre-forming polyesters by (a) esterifying terephthalic acid with a polymethylene glycol containing 2-10 carbon atoms and (b) polycondensing the resulting glycol ester or low molecular weight polymer thereof, there is used as esterification catalyst a compound containing manganese or cobalt in the form of an anion, e.g. potassium permanganate, sodium cobaltinitrite or a mixture thereof. Polycondensation may be effected in the presence of antimony trioxides as a catalyst and triphenyl phosphite or triphenyl phosphate as a stabilizer.

2 citations