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    Process for the production of alkyl isothiocyanic acid esters
    1.
    发明授权
    Process for the production of alkyl isothiocyanic acid esters 失效
    生产烷基异硫氰酸酯的方法

    公开(公告)号：US3787472A

    公开(公告)日：1974-01-22

    申请号：US3787472D

    申请日：1972-01-28

    Applicant: DEGUSSA

    Inventor： GIESSELMANN G ,  SCHWARZE W ,  WEIGERT W

    IPC: C07C331/20 ,  C07C161/04

    CPC classification number: C07C331/20

    Abstract: PROCESS FOR THE PRODUCTION OF BRANCHED ALKYL ISOTHIOCYANIC ACID ESTER OF THE GENERAL FORMULA

    R-N=C=S

    IN WHICH R IS A STRAIGHT OR BRAHCNED ALKYL RADICAL HAVING ABOUT 1-6 CARBON ATOMS, SAID PROCESS COMPRISING REACTING AN AQUEOUS SOLUTION OF ABOUT ONE MOLE OF A DITHIOCARBAMATE OF THE GENERAL FORMULA

    R-NH-C(=S)-S-ME

    IN WHICH ME IS AN NH4 GROUP, AN ALKYL AMMONIUM GROUP, AN ALKALINE EARTH METAL ATOM, OR AN ALKALI METAL ATOM, WITH AT LEAST ONE MOLE OF AN AQUEOUS HYDROGEN PEROXIDE SOLUTION, SAID REACTION CONDUCTED AT ABOUT 50*-120*C., AND AT A PH OF ABOUT 5-9, AND ISOLATING THE RESULTING ISOTHIOCYANIC ACID ESTER. THE ESTERS ARE USEFUL AS INTERMEDIATE IN THE PREPARATION OF OTHER COMPOUNDS AND ARE BIOLOGICALLY ACTIVE.

    Recovery of hydrogen peroxide from an aqueous solution by distillation with organic extractants
    3.
    发明授权
    Recovery of hydrogen peroxide from an aqueous solution by distillation with organic extractants 失效
    通过有机萃取剂蒸馏从水溶液中回收过氧化氢

    公开(公告)号：US3819818A

    公开(公告)日：1974-06-25

    申请号：US25442572

    申请日：1972-05-18

    Applicant: DEGUSSA

    Inventor： SCHREYER G ,  WEIBERG O ,  GIESSELMANN G ,  MONCH H

    IPC: C01B15/017 ,  C01B19/02 ,  B01J9/22

    CPC classification number: C01B19/02 ,  C01B15/017

    Abstract: HYDROGEN PEROXIDE IS CONVERTED FROM AN AQUEOUS SOLUTION INTO VAPOR OR LIQUID MIXTURES WITH NON AQUEOUS COMPOUNDS BY EXTRACTING AQUEOUS SOLUTIONS OF HYDROGEN PEROXIDE WITH HIGH BOILING SOLVENTS WHICH HAVE A HIGH SELECTIVITY FOR HYDROGEN PEROXIDE AND ARE RESISTANT TO HYDROGEN PEROXIDE AND WATER. A PORTION OF THE WATER ALSO EXTRACTED IS DIRECTLY DISTILLED FROM THE RESULTING EXTRACTION MIXTURE WITHOUT ADDITION OF AN ENTRAINING AGENT. SUBSEQUENTLY THE HYDROGEN PEROXIDE IS VAPORIZED IN A VACUUM FROM THE WATER POOR EXTRACT WITH ADDITION IN THE VAPOR PHSE OF THE DESIRED MIXING PARTENER WHICH BOILS LOWER THAN THE EXTRACTING AGENT WHEREUPON THE HYDROGEN PEROXIDE CONTAINING VAPORS ARE DRAWN OFF OR CONDENSED. THE HYDROGEN PEROXIDE CONTAINING VAPORS CAN BE PURIFIED BY PARTIAL CONDENSATION AND THE HIGH BOILING SOLVENT CAN BE RETURNED TO THE EXTRACTION STEP.

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