摘要:
The invention is a selective process for preparing 1,1,1-trichloroethane comprising irradiating a vaporous mixture comprising 1,1-dichloroethane, chlorine and a photocatalytic amount of iodine or a compound which liberates iodine in the presence of chlorine with radiation from a light source capable of providing radiation at a wavelength at which a binary intermediate formed from iodine and chlorine absorbs and at which chlorine does not absorb appreciably or has very low absorption, wherein the radiation is capable of inducing the selective formation of 1,1,1-trichloroethane. This process results in a reaction with surprisingly higher selectivity for 1,1,1-trichloroethane.
摘要:
Compositions de 1,1,1-trichloréthane stabilisées contenant un composé époxydé tel que l'époxybutane, un composé nitré tel que le nitrométhane et un composé furannique tel que le 2-méthylfuranne. Ces compositions conveniennent bien pour dégraisser les métaux et en nettoyage à sec des textiles.
摘要:
A solvent composition comprising 1,1,1-trichloroethane and a stabilizing amount of an epoxide of formula wherein R 1 and R 2 are hydrogen, alkyl of 1 to 4 carbon atoms, phenyl or benzyl,
R 3 is hydrogen or alkyl of 1 to 4 carbon atoms, R 4 is alkyl of 1 to 4 carbon atoms and n is 0 or 1.
Preferably the or each alkyl group contains 1 or 2 carbon atoms; examples of useful epoxides are ethyl trans-2,3-epoxybutyrate, ethyl 3,4-epoxy-3-methylvalerate and ethyl beta-methyl-beta-phenylglycidate. The composition can be used for degreasing.
摘要:
An object of the present invention is to provide a novel azeoropic or azeotrope-like composition that is effective for the separation of HF from 1,1,2-trichloroethane (HCC-140), trans-1,2-dichloroethylene (HCO-1130(E)), or cis-1,2-dichloroethylene (HCO-1130(Z)). The object can be achieved by an azeotropic or azeotrope-like composition comprising HCC-140, HCO-1130(E), or HCO-1130(Z), and hydrogen fluoride.
摘要:
The present invention provides processes for the production of chlorinated methanes via the direct chlorination of methane. The processes include a dehydrochlorination and/or chlorination step that converts up to 100% of the higher chlorinated alkanes in a process stream from the methane chlorination reaction into more highly chlorinated alkanes. These more highly chlorinated alkanes can be easily removed from the process stream. The use of a cost effective feedstream of crude methane is thus rendered possible, without additional capital expenditure for the sophisticated separation equipment required to separate ethane and other hydrocarbon components from the methane feed.
摘要:
A solvent composition for cleaning metal and other arti- ctes which comprises 1,1,1-trichloroethane having dissolved therein a stabilising amount of a mixture of stabilising components comprising (i) tertiary butanol (ii) nitromethane and (iii) 1-or 2-nitropropane or nitroethane, in which mixture the specified stabilising components are present in the mole fraction per cent ranges encompassed by Contour K in Figure 1 of the drawings in the case where component (iii) is 1-or 2-nitropropane or by Contour A in Figure 2 of the drawing in the case where component (iii) is nitroethane.
摘要:
The invention is a selective process for preparing 1,1,1-trichloroethane comprising irradiating a vaporous mixture comprising 1,1-dichloroethane, chlorine and an effective amount of a photocatalyst wherein the photocatalyst is bromine, a compound which liberates bromine in the presence of chlorine, carbon monoxide, nitric oxide or oxygen, with radiation capable of inducing the selective formation of 1,1,1-trichloroethane. Radiation in the wavelength of between about 250 and 550 nanometers is capable of inducing the selective formation of 1,1,1-trichloroethane.