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    • 1. 发明授权
    • Process for the production of cyanogen chloride and hydrogen chloride
    • US3961023A
    • 1976-06-01
    • US540706
    • 1975-01-13
    • Friedhelm GeigerWerner HeimbergerGerd SchreyerWolfgang Weigert
    • Friedhelm GeigerWerner HeimbergerGerd SchreyerWolfgang Weigert
    • B01D53/68B01D53/14B01D53/77C01B7/00C01B7/01C01C3/00C01C3/14C01B21/18
    • C01C3/004B01D53/1493C01B7/01
    • Cyanogen chloride and hydrogen chloride are produced by reacting hydrogen cyanide and chlorine, separating from the gaseous mixture on the one hand hydrogen chloride and on the other hand cyanogen chloride which in a given case can also contain chlorine, by absorption in a halohydrocarbon which has a boiling point between that of cyanogen chloride and cyanuric chloride and after distillative separation of the dissolved cyanogen chloride-chlorine mixture returning the solvent to the absorption column, the process includesA. adding as the solvent for the absorption a trifluoromethyl substituted aromatic hydrocarbon or halohydrocarbon or a mixture of such trifluoromethyl substituted aromatic hydrocarbons or halohydrocarbons,B. subjecting the gas mixture consisting of cyanogen chloride, hydrogen chloride and in a given case chlorine after leaving the reactor for the chlorination of hydrogen cyanide and before entrance into the absorption column to a pretreatment with the solvents set forth under (a) at a temperature between 80.degree.C. and the boiling point of the solvent and/orC. either converting the N-chloro-chloroformimide chloride formed in small amounts from the chlorine and cyanogen chloride in the course of the absorption and distillation into the insoluble chloroformimide chloride hydrochloride by gassing the solvent with hydrogen chloride and separating the insoluble hydrochloride in conventional manner and/or withdrawing the N-chloro-chloroformimide together with some cyanogen chloride and solvent of the previously named distillation column for separation of the cyanogen chloride by means of a side outlet, and in a second subsequently provided distillation column separating into solvent and pure N-chloro-chloroformimide chloride, whereby then the latter can be conducted both into the cyanogen chloride reactor and also, if connected to a plant for the production of cyanuric chloride, into the trimerization reactor for cyanogen chloride and/orD. subjecting the solvent contaminated with byproducts by the suspension resulting from the pretreatment and/or accumulating in the sump of the distillation column for the separation of the cyanogen chloride completely or in a partial stream to an aqueous alkaline treatment or in combination with a cyanuric chloride condensation plant leading the suspension formed in the pretreatment to the cyanuric chloride condensation column.
    • 8. 发明授权
    • Process for the production of finely divided solid cyanuric chloride
    • 生产精细分散固体氰基氯化物的方法
    • US4038276A
    • 1977-07-26
    • US716353
    • 1976-08-20
    • Friedhelm GeigerWerner HeimbergerTheodor Lussling
    • Friedhelm GeigerWerner HeimbergerTheodor Lussling
    • C07D251/28
    • C07D251/28
    • Finely divided solid cyanuric chloride is produced by feeding a jet of liquid cyanuric chloride into a separatory container, cooling the liquid cyanuric chloride with recycling inert gases to such an extent that the cyanuric chloride is separated in crystalline form, washing the thereby warmed cyanuric chloride vapor or dust containing gases free of cyanuric chloride in countercurrent flow with an inert liquid that is a good solvent for cyanuric chloride in a washing column connected to the outlet side of the separatory column, thus simultaneously cooling the gases, and subsequently again returning the gases to the separatory container, while the temperature of the cyanuric chloride containing washing liquid which has increased in the washing process is again brought to the original temperature by leading it in the cycle over a heat exchanger and spraying the inside of the pipe connected to the separatory container and leading to the washing column constantly with the washing liquid while dividing a partial stream of the cyanuric chloride containing washing liquid in a distillation column into pure liquid cyanuric chloride which is recycled into the separatory column and into pure washing liquid which is recycled into the washing column.