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    21.
    发明专利
    未知

    公开(公告)号：FI64558B

    公开(公告)日：1983-08-31

    申请号：FI773140

    申请日：1977-10-21

    Applicant: DEGUSSA

    Inventor： JUNKERMANN HELMUT ,  HAFNER VOLKER

    IPC: C02F1/28 ,  C02F1/76 ,  C02F9/00 ,  C02F1/72

    Abstract: Phenol or phenol-formaldehyde containing waste water is purified with chlorine dioxide by treating the waste water with alkali or alkaline earth metal chlorite in the presence of formaldehyde and the weight ratio of formaldehyde to phenol is between 0.5 to 2:1 and the mole ratio of the sum of phenol + formaldehyde to chlorite is between 1:1.2 to 1:2, whereupon the treated water is decolorized, in a given case in known manner.

    23.
    发明专利
    未知

    公开(公告)号：DE2657192B1

    公开(公告)日：1978-06-08

    申请号：DE2657192

    申请日：1976-12-17

    Applicant: DEGUSSA

    Inventor： JUNKERMANN HELMUT DIPL-CHEM DR ,  HAFNER VOLKER

    IPC: C02F1/28 ,  C02F1/76 ,  C02F9/00 ,  C02C5/04 ,  C02C5/02

    Abstract: Phenol or phenol-formaldehyde containing waste water is purified with chlorine dioxide by treating the waste water with alkali or alkaline earth metal chlorite in the presence of formaldehyde and the weight ratio of formaldehyde to phenol is between 0.5 to 2:1 and the mole ratio of the sum of phenol + formaldehyde to chlorite is between 1:1.2 to 1:2, whereupon the treated water is decolorized, in a given case in known manner.

    PROCESS FOR PRODUCING 2-HYDROXY-4-METHYLTHIOBUTYRIC ACID (MHA) AND ITS USE AS FEEDSTUFF SUPPLEMENT
    24.
    发明专利
    PROCESS FOR PRODUCING 2-HYDROXY-4-METHYLTHIOBUTYRIC ACID (MHA) AND ITS USE AS FEEDSTUFF SUPPLEMENT 未知

    公开(公告)号：MY132083A

    公开(公告)日：2007-09-28

    申请号：MYPI9502340

    申请日：1995-08-10

    Applicant: DEGUSSA

    Inventor： SUCHSLAND HELMUT DR ,  HAFNER VOLKER

    IPC: A23K1/16 ,  C07C319/28 ,  C07C319/20 ,  C07C323/52 ,  C07C323/60

    Abstract: 1.METHOD FOR MANUFACTURING 2-HYDROXY-4-METHYLTHIOBUTYRIC ACID (MHA) AND USE THEREOF. 2.1KNOWN TECHNICAL METHODS USE FOR ISOLATING MHA FROM THE REACTION MIXTURE OBTAINED DURING THE HYDROLYSIS OF MMP-CYANOHYDRIN A LIQUID-LIQUID EXTRACTION OR A COMBINED LIQUID-LIQUID AND SOLID-LIQUID PHASE SEPARATION. THE METHODS ARE EITHER EXPENSIVE OR WASTE MATERIALS DIFFICULT TO DISPOSE OF ARE OBTAINED. 2.2THESE DISADVANTAGES ARE OVERCOME BY THE ISOLATION OF MHA BY MEANS OF A SOLID/LIQUID SEPARATION, IN WHICH THE REACTION MIXTURE IS EVAPORATED WITH THE OBTAINING OF AN MHA-CONTAINING SALT RESIDUE RANGING FROM FREE OF RESIDUAL WATER TO POSSESSING A LOW RESIDUAL WATER CONTENT, THE MHA-CONTAINING SALT RESIDUE IS THEN TREATED WITH AN ORGANIC SOLVENT WITH THE OBTAINING OF A SUSPENSION, THE SOLID COMPONENTS ARE THEN SEPARATED FROM THE SUSPENSION WITH THE OBTAINING OF AN MHA-CONTAINING SOLUTION, THEREAFTER THE ORGANIC SOLVENT IS REMOVED FROM THE MHA-CONTAINING SOLUTION WITH THE OBTAINING OF AN MHA RESIDUE AND OPTIONALLY THEREAFTER THE MHA RESIDUE IS CONDITIONED BY THE ADDITION OF WATER. IN ADDITION TO HIGH-GRADE MHA, MERCHANTABLE CRYSTALLINE AMMONIUM SULPHATE AND/OR AMMONIUM HYDROGENSULPHATE IS OBTAINED.2.3ANIMAL FODDER SUPPLEMENT.

    25.
    发明专利
    未知

    公开(公告)号：ES2160264T3

    公开(公告)日：2001-11-01

    申请号：ES96943038

    申请日：1996-12-05

    Applicant: DEGUSSA

    Inventor： HASSEBERG HANS-ALBRECHT ,  HASSELBACH HANS-JOACHIM ,  HUTHMACHER KLAUS ,  HAFNER VOLKER ,  HEINZEL HARALD ,  JAGER BARBARA

    IPC: C07C319/20 ,  C07C319/28 ,  C07C323/52

    Abstract: PCT No. PCT/EP96/05437 Sec. 371 Date Sep. 1, 1998 Sec. 102(e) Date Sep. 1, 1998 PCT Filed Dec. 5, 1996 PCT Pub. No. WO97/23452 PCT Pub. Date Jul. 3, 1997A method for the isolation of 2-hydroxy-4-methylthiobutyric acid (MHA), wherein MHA is isolated from a reaction mixture obtained by addition of hydrogen cyanide (HCN) to methylmercaptopropionaldehyde (MMP) and hydrolysis by sulphuric acid of the methylmercaptopropionaldehyde cyanohydrin (MMP-CH) thus obtained. The reaction mixture is brought into contact in a liquid/liquid extraction system with an organic solvent substantially immiscible with water, in order to form an extraction solution which contains the solvent and the MHA transferred out of the reaction mixture. By bringing the salt content of the reaction mixture, prior to the liquid/liquid extraction, to a concentration of about >50 wt. % (wt./wt.), preferably >55 wt. %, referred to the sum of the inorganic constituents of the reaction mixture, the coordinated use of energy in the total system is improved, the evaporation of strongly corrosive solutions is avoided, the efficiency of the hydrolysis step is increased and the distribution coefficients during the extraction are improved. The MHA is isolated as the extract from this extraction solution by evaporation, and may be used as animal feed supplement.

    Process for obtaining 2-hydroxy-4-methylthiobutyric acid (MHA)
    29.
    发明专利
    Process for obtaining 2-hydroxy-4-methylthiobutyric acid (MHA) 未知

    公开(公告)号：AU717705B2

    公开(公告)日：2000-03-30

    申请号：AU1190697

    申请日：1996-12-05

    Applicant: DEGUSSA

    Inventor： HASSEBERG HANS-ALBRECHT ,  HASSELBACH HANS-JOACHIM ,  HUTHMACHER KLAUS ,  HAFNER VOLKER ,  HEINZEL HARALD ,  JAGER BARBARA

    IPC: C07C319/20 ,  C07C319/28 ,  C07C323/52

    Abstract: PCT No. PCT/EP96/05437 Sec. 371 Date Sep. 1, 1998 Sec. 102(e) Date Sep. 1, 1998 PCT Filed Dec. 5, 1996 PCT Pub. No. WO97/23452 PCT Pub. Date Jul. 3, 1997A method for the isolation of 2-hydroxy-4-methylthiobutyric acid (MHA), wherein MHA is isolated from a reaction mixture obtained by addition of hydrogen cyanide (HCN) to methylmercaptopropionaldehyde (MMP) and hydrolysis by sulphuric acid of the methylmercaptopropionaldehyde cyanohydrin (MMP-CH) thus obtained. The reaction mixture is brought into contact in a liquid/liquid extraction system with an organic solvent substantially immiscible with water, in order to form an extraction solution which contains the solvent and the MHA transferred out of the reaction mixture. By bringing the salt content of the reaction mixture, prior to the liquid/liquid extraction, to a concentration of about >50 wt. % (wt./wt.), preferably >55 wt. %, referred to the sum of the inorganic constituents of the reaction mixture, the coordinated use of energy in the total system is improved, the evaporation of strongly corrosive solutions is avoided, the efficiency of the hydrolysis step is increased and the distribution coefficients during the extraction are improved. The MHA is isolated as the extract from this extraction solution by evaporation, and may be used as animal feed supplement.

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