Production of stable dichloroacetaldehyde
    16.
    发明授权
    Production of stable dichloroacetaldehyde 失效
    生产稳定的二氯乙醛

    公开(公告)号:US3562334A

    公开(公告)日:1971-02-09

    申请号:US3562334D

    申请日:1964-09-21

    Applicant: FMC CORP

    CPC classification number: C07C47/14 C07C45/63 C07C45/86

    Abstract: A HIGH-PURITY DICHLOROACETALDEHYDE (DCA) IS OBTAINED WHICH IS STABLE AGAINST LINEAR POLYMERIZATION BY MAINTAINING THE HYDROGEN CHLORIDE CONCENTRATION AT NO GREATER THAN 0.5% BY WEIGHT, MAINTAINING THE MONOCHLOROACETALDEHYDE CONCENTRATION AT NO GREATER THAN 1% AND BY MAINTAINING THE DCA PRODUCT FREE OF METAL IMPURITES; IF METAL IMPURITIES ARE PRESENT, THEY CAN BE NEUTRALIZED BY ADDITION OF EFFECTIVE AMOUNTS OF EITHER 2-BENZOTHIAZYL DISULFIDE, THIOUREA OR ETHANOLAMINE.

    Process for producing tetraacetyl derivatives of diamines
    19.
    发明授权
    Process for producing tetraacetyl derivatives of diamines 失效
    生产二胺的四氢噻吩衍生物的方法

    公开(公告)号:US3539629A

    公开(公告)日:1970-11-10

    申请号:US3539629D

    申请日:1968-03-13

    Applicant: FMC CORP

    CPC classification number: C07C233/90

    Abstract: 1,216,294. Acetylated diamines. FMC CORP. 11 March, 1969 [13 March, 1968], No. 12809/69. Heading C2C. A process for the production of tetraacetylated diamines of the formula wherein R is an aliphatic hydrocarbon radical having 1 to 3 carbon atoms between the flanking nitrogen atoms and which may be substituted by aliphatic or cycloaliphatic groups having up to 16 carbon atoms or by phenyl or substituted phenyl groups or R is a phenylene or substituted phenylene group, comprises reacting ketene with either or with where R 1 represents the same groups as R but must have at least two carbon atoms between the two nitrogen atoms, in the presence of a catalytic amount of phosphoric acid, preferably orthophosphoric acid at a temperature of 40‹ C. to 100‹ C.; preferably sulphur or a sulphur compound e.g. phenothiazine or methyl-thio-mcresol is present as an auxiliary catalyst. Examples describe the preparation of compounds wherein R = -CH 2 -; -CH 2 -CH 2 -; -CH-; -CH-; p-phenylene. CH 3 Ph Reference has been directed by the Comptroller to Specification 907,357.

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