摘要:
Dielectric liquids are prepared by (a) Friedel-Crafts condensing at least one aromatic halide with at least one aromatic compound in the presence of a catalytically effective amount of ferric chloride, and thereafter deliberately avoiding any downstream destruction/neutralization and/or washing of such ferric chloride catalyst, (b) optionally, removing unreacted reactants from the medium of reaction, and (c) recovering from such medium of reaction a purified dielectric liquid; the subject process is thus environmentally improved by avoiding the generation of aqueous solutions containing contaminating amounts of objectionable organic compounds.
摘要:
Benzyltoluene/benzylxylene admixtures, easily prepared via Friedel-Crafts condensation of benzyl chloride with a mixture of toluene and xylene, are useful dielectric oils exhibiting improved rigidity and are well suited for inclusion in voltage transformers, capacitors, electrical cables, and the like.
摘要:
Novel dielectric compositions, well adapted for low temperature applications, include admixture of benzyltoluene, benzylbenzene and the higher homologs thereof, and optionally contain triphenylmethane, ditolylphenylmethane, tolyldiphenylmethane and the higher homologs thereof; the subject novel compositions are prepared by chlorinating a mixture of toluene and benzene and then treating the product of reaction with an inorganic halide.
摘要:
Novel dielectric liquids for such electrical components as transformers, capacitors and cables, especially adopted for low temperature applications, comprise immixtures of benzyltoluene, (methylbenzyl)toluene, benzylxylene and (methylbenzyl)xylene, and optionally include the benzyl or methylbenzyl derivatives thereof; these immixtures are facilely prepared by chlorinating a mixture of xylene and toluene and then adding a catalytically effective amount of a Friedel-Crafts catalyst to the medium of chlorination.
摘要:
Novel dielectric liquids for such electrical components as transformers, capacitors and cables, especially adopted for low temperature applications, comprise a mixture of benzyltoluene and (methylbenzyl)xylene isomers, notably a mixture of benzyltoluene/dibenzyltoluene isomers with (methylbenzyl)xylene/di(methylbenzyl)xylene isomers.
摘要:
A liquid composition comprising a mixture of isomers of essentially diisocyanates having the diphenylmethane structure, the distribution by weight of isomers in the composition for each 100 parts by weight of the composition being:32 to 55% of the 4,4' isomer,30 to 45% of the 2,4' isomer,5 to 12% of the 3,4' isomer,4 to 10% of the 2,2' isomer, and2 to 5% of the 2,3' isomer;and the method of making the composition by first reacting a benzyl halide with benzene, followed by nitration, hydrogenation, and phosgenation.
摘要:
The invention relates to a dielectric composition including at least one polyarylalkane oligomer of formula: ##STR1## in which n.sub.1 and n.sub.2 =0, 1 or 2, with the proviso that n.sub.1 +n.sub.2 =1 or 2, x=0, 1, 2, 3, 4, 5 or 6 and that the said composition has, in particular, a breakdown voltage increasing with the temperature.
摘要:
In a process for the purification by distillation of chlorinated aromatic hydrocarbons originating from the chlorination of aromatic hydrocarbons in the presence of FeCl.sub.3, the crude reaction product is first partially degassed and then directly subjected to distillation in the presence of said FeCl.sub.3.
摘要:
The invention relates to a process for the synthesis of 1,1-bis(chlorophenyl)-2,2,2-trichloroethanol in (dicofol) from chlorol and chlorobenzene, in which process the acid by-products formed during the condensation reaction of the chloral and the chlorobenzene are used as reaction medium in the final step for synthesis of dicofol.
摘要:
Mixtures of isomers, e.g., mixtures of phenethyl bromide and 1-phenyl-1-bromoethane, are separated by (a) selectively condensing one such isomer with an aromatic compound bearing at least one aryl (nuclear) hydrogen atom, e.g., xylene, in the presence of a catalytically effective amount of a Friedel-Crafts catalyst, e.g., ferric chloride, and then (b) separating the product of condensation, e.g., phenylxylylethane, from the unreacted isomer.