2.
    发明专利
    未知

    公开(公告)号:DE3043159A1

    公开(公告)日:1982-06-09

    申请号:DE3043159

    申请日:1980-11-15

    Applicant: DEGUSSA

    Abstract: The invention is directed to cyclic acetals of glutamic acid- gamma -semialdehyde of the formula (I) in which A is an unsubstituted alkylene group having 2 to 3 carbon atoms or such an alkylene group substituted by 1 to 2 methyl groups and to a method of producing a compound of formula (I) by reaction of a compound of the general formula (II) in which A is as defined above with hydrogen cyanide or a cyanide ion supplying compound, ammonia or an ammonium ion supplying compound and carbon dioxide or a carbonate ion supplying compound and basic hydrolysis of the reaction mixture obtained and to using the compound of formula (I) to produce D,L-proline.

    3.
    发明专利
    未知

    公开(公告)号:DE59005898D1

    公开(公告)日:1994-07-07

    申请号:DE59005898

    申请日:1990-07-24

    Applicant: DEGUSSA

    Abstract: The invention relates to the disodium salt of trimercapto-s-triazine hexahydrate (TMT-Na2 &cirf& 6 H2O), to a process for its preparation, and to its use. The solubility in water of TMT-Na2 &cirf& 6 H2O is considerably greater than that of previously known sodium salts of TMT. It is used for separating off heavy metals from an aqueous phase, in particular from waste water. It is prepared by reacting TMT-Na3 &cirf& 9 H2O, which is accessible via cyanuric chloride, and trimercapto-s-triazine (TMT-H3) in a molar ratio of 2 to 2.1 to 1 in aqueous phase, followed by crystallisation of TMT-Na2 &cirf& 6 H2O.

    10.
    发明专利
    未知

    公开(公告)号:DE3927469A1

    公开(公告)日:1991-02-21

    申请号:DE3927469

    申请日:1989-08-19

    Applicant: DEGUSSA

    Abstract: The invention relates to the disodium salt of trimercapto-s-triazine hexahydrate (TMT-Na2 &cirf& 6 H2O), to a process for its preparation, and to its use. The solubility in water of TMT-Na2 &cirf& 6 H2O is considerably greater than that of previously known sodium salts of TMT. It is used for separating off heavy metals from an aqueous phase, in particular from waste water. It is prepared by reacting TMT-Na3 &cirf& 9 H2O, which is accessible via cyanuric chloride, and trimercapto-s-triazine (TMT-H3) in a molar ratio of 2 to 2.1 to 1 in aqueous phase, followed by crystallisation of TMT-Na2 &cirf& 6 H2O.

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