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    Method for obtaining 2-hydroxy-4-methylthiobutyricacid (MHA)
    1.
    发明专利
    Method for obtaining 2-hydroxy-4-methylthiobutyricacid (MHA) 未知

    公开(公告)号：IN190919B

    公开(公告)日：2003-08-30

    申请号：IN2209CA1996

    申请日：1996-12-20

    Applicant: DEGUSSA

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

    IPC: C07C319/20 ,  C07C319/28 ,  C07C323/52 ,  C07C315/00

    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.

    2.
    发明专利
    未知

    公开(公告)号：ES2183755T3

    公开(公告)日：2003-04-01

    申请号：ES00100474

    申请日：2000-01-11

    Applicant: DEGUSSA

    Inventor： KRILL STEFFEN DR ,  WEIGEL HORST ,  HUTHMACHER KLAUS DR ,  SHI NONGYUAN DR ,  MARKOWZ GEORG DR ,  HAFNER VOLKER

    IPC: B01J31/02 ,  C07B61/00 ,  C07C67/00 ,  C07C67/52 ,  C07C67/54 ,  C07C69/017 ,  C07C69/16 ,  C07C69/28

    Abstract: In the preparation of 2,3,5-trimethyl-hydroquinone diesters (I) by catalytic acylation of keto-isophorone (II), the acylating agent is a carboxylic anhydride containing a 1-4C alkyl residue, the reaction solution is cooled to -10 to 35 (preferably 0-30) degrees C, the crystallized (I) is filtered off and the filtrate is recycled to the acylation. In the preparation of 2,3,5-trimethyl-hydroquinone diesters (I) by catalytic acylation of keto-isophorone (II), the acylating agent is a carboxylic anhydride containing a 1-4C alkyl residue, the reaction solution is cooled to -10 to 35 (preferably 0-30) degrees C (optionally after distilling off part of the obtained carboxylic acid (III)), the crystallized (I) is filtered off and the filtrate is recycled to the acylation (optionally after distilling off part of (III) and/or discarding part of the filtrate).

    Process for obtaining 2-hydroxy-4-methyl thiobutyric acid (MHA), MHA and its use
    4.
    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：AU690714B2

    公开(公告)日：1998-04-30

    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.

    METHOD FOR THE ISOLATION OF 2-HYDROXY-4- METHYLTHIOBUTYRIC ACID (MHA)
    5.
    发明专利
    METHOD FOR THE ISOLATION OF 2-HYDROXY-4- METHYLTHIOBUTYRIC ACID (MHA) 未知

    公开(公告)号：MY117493A

    公开(公告)日：2004-07-31

    申请号：MYPI9605345

    申请日：1996-12-19

    Applicant: DEGUSSA

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

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

    Abstract: 1.1 A METHOD FOR THE ISOLATION OF 2-HYDROXY-4-METHYLTHIOBUTYRIC ACID (MHA). KNOWN METHODS, WHEREBY 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 BEING 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, AND THE MHA IS ISOLATED AS THE EXTRACT FROM THIS EXTRACTION SOLUTION BY EVAPORATION, SOLVE THE PROBLEM OF THE FLOW OF WASTE SULPHATE BY CONNECTION WITH A SPLIT-CONTACT PLANT, AN EVAPORATION OF THE SALT-CONTAINING FLOW OF WASTE MATERIAL BEING NECESSARY FOR THE EFFICIENT OPERATION THEREOF. 2.2 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, ACCORDING TO THE INVENTION THE COORDINATED USE OF ENERGY IN THE TOTAL SYSTEM IS IMPROVED, THE EVAPORATION OF STRONGLY CORROSIVE SOLUTIONS IS AVOIDED, THE REACTION IN THE HYDROLYSIS STEP IS INCREASED AND THE DISTRIBUTION COEFFICIENTS DURING THE EXTRACTION ARE IMPROVED. 2.3 ANIMAL FEED SUPPLEMENT.

    8.
    发明专利
    未知

    公开(公告)号：NO147872C

    公开(公告)日：1983-06-29

    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.

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