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    3.
    发明专利
    未知

    公开(公告)号：DE2401412A1

    公开(公告)日：1975-07-24

    申请号：DE2401412

    申请日：1974-01-12

    Applicant: DEGUSSA

    Inventor： GEIGER FRIEDHELM DR ,  HEIMBERGER WERNER DR ,  SCHREYER GERD DR ,  WEIGERT WOLFGANG DR

    IPC: B01D53/68 ,  B01D53/14 ,  B01D53/77 ,  C01B7/00 ,  C01B7/01 ,  C01C3/00 ,  C01C3/14 ,  C01B7/08

    Abstract: 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 includes A. 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 DEG C. and the boiling point of the solvent and/or C. 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/or D. 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.

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