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    Process for obtaining 2-hydroxy-4-methyl thiobutyric acid (mha), mha and its use
    42.
    发明专利
    Process for obtaining 2-hydroxy-4-methyl thiobutyric acid (mha), mha and its use 未知

    公开(公告)号：AU2888395A

    公开(公告)日：1996-02-09

    申请号：AU2888395

    申请日：1995-06-28

    Applicant: DEGUSSA

    Inventor： HASSEBERG HANS-ALBRECHT ,  HUTHMACHER KLAUS ,  TANNER HERBERT ,  HAFNER VOLKER ,  HEINZEL HARALD

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

    Abstract: PCT No. PCT/EP95/02515 Sec. 371 Date Jan. 13, 1997 Sec. 102(e) Date Jan. 13, 1997 PCT Filed Jun. 28, 1995 PCT Pub. No. WO96/01809 PCT Pub. Date Jan. 25, 1996It is known to isolate MHA from a reaction mixture obtained by the addition of hydrocyanic acid (HCN) to methyl mercaptopropionic aldehyde (MMP) and the hydrolysis of the methyl mercapto propionic aldehyde cyanohydrine (MMP-CH) obtained thereby with sulphuric acid, in which the reaction mixture is brought into contact with a substantially non-water-miscible organic solvent, in order to form an extraction solution having the solvent and MHA transferred from the reaction mixture, and the MHA is obtained as an extract from this extraction solution by concentration. The simplest and most economical process of the invention concerning the processing of the reaction product which facilitates the production of a highly concentrated product with an extremely low dimer, oligomer and by-product content, is characterised in that the concentration is conducted in such a way that the remaining extract contains less than 4 wt % and preferably less than 2 wt % of water. Animal feed supplement, mixtures for supplementing animal feed, e.g. with methionine or ammonium-MHA.

    43.
    发明专利
    未知

    公开(公告)号：NO147872B

    公开(公告)日：1983-03-21

    申请号：NO774278

    申请日：1977-12-13

    Applicant: DEGUSSA

    Inventor： JUNKERMANN HELMUT ,  HAFNER VOLKER

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

    44.
    发明专利
    未知

    公开(公告)号：FR2467842A1

    公开(公告)日：1981-04-30

    申请号：FR8018942

    申请日：1980-09-02

    Applicant: DEGUSSA

    Inventor： SUCHSLAND HELMUT ,  HAFNER VOLKER ,  KLEEMANN AXEL

    IPC: C07C253/08 ,  C07C20060101 ,  C07C67/00 ,  C07C253/00 ,  C07C255/24 ,  C07C255/61 ,  C07C121/43 ,  C07C120/00

    Abstract: The invention is directed to a process for the production of iminodiacetonitrile by reaction of hexamethylenetetramine with hydrogen cyanide in acidic aqueous mediums. In this process the pH during the reaction which is 5.5 to 7.5 at the beginning is progressively lowered, altogether around 0.5 to 3.5 units and free formaldehyde is present only to a slight extent. Through this and in contrast to the known processes the formation of byproducts is suppressed and iminodiacetonitrile is produced directly in very good yields and sufficiently pure for further use.

    45.
    发明专利
    未知

    公开(公告)号：FR2461777A1

    公开(公告)日：1981-02-06

    申请号：FR8008322

    申请日：1980-04-14

    Applicant: DEGUSSA

    Inventor： BERNDT WILHELM ,  JUNKERMANN HELMUT ,  KRUGER HORST ,  HAFNER VOLKER ,  WINK JAKOB

    IPC: D21C11/08

    Abstract: The highly odorous evaporation condensates arising in the recovery of chemicals in pulp digestion are completely deodorized by addition of hydrogen peroxide alone, i.e. without addition of a metal salt as activator, and can immediately be used either as washing water in the processing of the digestion waste liquors for chemicals recovery or discharged directly into a watercourse.

    47.
    发明专利
    未知

    公开(公告)号：FI773140A

    公开(公告)日：1978-06-18

    申请号：FI773140

    申请日：1977-10-21

    Applicant: DEGUSSA

    Inventor： JUNKERMANN HELMUT ,  HAFNER VOLKER

    IPC: C02F1/28 ,  C02F1/76 ,  C02F9/00 ,  C02C

    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.

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