公开(公告)号：NO801311A

公开(公告)日：1981-01-19

申请号：NO801311

申请日：1980-05-05

Applicant: DEGUSSA

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

IPC: D21C11/08 ,  D21C

CPC classification number: D21C11/08

公开(公告)号：AU3066077A

公开(公告)日：1979-05-24

申请号：AU3066077

申请日：1977-11-15

Applicant: DEGUSSA

Inventor： JUNKERMANN HELMUT ,  HAFNER VOLKER

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

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.

公开(公告)号：AU6224101A

公开(公告)日：2001-12-24

申请号：AU6224101

申请日：2001-04-28

Applicant: DEGUSSA

Inventor： KRILL STEFFEN ,  KRETZ STEPHAN ,  HAFNER VOLKER ,  MARKOWZ GEORG

IPC: C07C41/28 ,  C07C41/38 ,  C07C43/16

Abstract: Process for the production of unsaturated ethers, in particular isopropenyl methyl ether (IPM), by pyrolysis of a ketal-containing or acetal-containing mixture, in particular dimethoxypropane (DMP), in the liquid phase in the presence of an organic carboxylic acid, according to the following reaction scheme:wherein R1=H or alkyl with 1-8 C atoms; R2=H, CH3-, C2H5-, or Cl-; R3=alkyl with 1-8 C atoms; R4=H, CH3-, C2H5-, or C3H7-, and R1 and R4 may be joined to form a 5-, 6-, or 7-membered ring. DMP is produced by the process from acetone and methanol by reaction in an acidic heterogeneous ion exchanger, the product being isolated by extraction with aqueous alkaline solution. In particular the process involves combining the IPM reaction product with the DMP reaction product, which permits the execution of a stable recycling process in which the methanol-containing streams of the IPM and DMP stages can be simultaneously extracted. The product may be isolated by the process by simple distillation of IPM from a mixture containing IPM, DMP and acetone.

公开(公告)号：HK1027339A1

公开(公告)日：2001-01-12

申请号：HK98119190

申请日：1998-12-29

Applicant: DEGUSSA

Inventor： HASSEBERG HANS-ALBRECHT ,  HASSELBACH HANS-JOACHIM ,  HUTHMACHER KLAUS ,  HAFNER VOLKER ,  HEINZEL HARALD ,  RONNEBURG AXEL

IPC: C07C319/20 ,  A23K20/105 ,  C07C319/26 ,  C07C319/28 ,  C07C323/52 ,  C07C

Abstract: A method for obtaining 2-hydroxy-4-methylthiobutyric acid (methionine-hydroxy analog, MHA) in primarily free form which is stable in storage by distilling a product solution containing MHA and by producing MHA product mixtures with improved storage stability from such a distillate. The distillate can be produced directly starting from MHA raw products from any MHA production process, which can optionally also contain solvent or water. The starting material may also be a commercial MHA product.

公开(公告)号：ES2132685T3

公开(公告)日：1999-08-16

申请号：ES95924331

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.

公开(公告)号：AU9698798A

公开(公告)日：1999-07-01

申请号：AU9698798

申请日：1998-12-08

Applicant: DEGUSSA

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

IPC: B01D53/34 ,  B01D53/50 ,  B01D53/77 ,  C01B17/58 ,  C01B17/74 ,  C07C319/20 ,  C07C319/28 ,  C07C323/52 ,  C07C323/60 ,  C01B17/76

Abstract: Recovery of sulfuric acid used in hydrolysis of methylmercaptopropionaldehyde-cyanohydrin is carried out by combustion of sulfates produced during the reaction to give a sulfur dioxide-containing mixture, which is then reacted with hydrogen peroxide. Recovery of sulfuric acid used in hydrolysis of methylmercaptopropionaldehyde-cyanohydrin (MMP-CH) comprises converting sulfate salt precipitates produced during the hydrolysis to SO2 in a furnace. The SO2-containing mixture is passed through an aqueous solution containing sulfuric acid and hydrogen peroxide, to convert the SO2 back to sulfuric acid. An Independent claim is also included for preparation of 2-hydroxy-4-methylthiobutyric acid (MHA) by hydrolysis of MMP-CH in the presence of sulfuric acid to give MHA and ammonium hydrogen sulfate and/or ammonium sulfate. The MHA is isolated and the sulfuric acid is recovered and recycled using the above method.

公开(公告)号：MX9804881A

公开(公告)日：1998-10-31

申请号：MX9804881

申请日：1998-06-17

Applicant: DEGUSSA

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

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

Abstract: En procesos conocidos el MHA es aislado de la mezcla de reaccion obtenida por ácido hidrocianurico (HCN) a metilmercaptopropionaldehido (MNP) e hidrolisis de la cianhidrina de metilmercaptopropionaldehido (MMP-CH) con ácido sulfurico, para lo cual la mezcla de reaccion se pone en contacto con un solvente orgánico en los esencial inmiscible en agua en un sistema de extraccion fluido/fluido, para formar una solucion de extraccion, que consiste del solvente y del MHA transferido de la mezcla de reaccion, y el MHA se obtiene como un extracto de esa solucion de extraccion por medio de evaporacion. Esos procesos resuelven el problema del desperdicio de sulfatos al acoplarse con un sistema de recuperacion de ácido sulfurico. Para la operacion efectiva de este ultimo, las corrientes de desecho que contienen sales deben someterse a una evaporacion. De acuerdo con la invencion, el contenido de sal de la mezcla de reaccion antes de la extraccion fluido/fluido se ajusta a un nivel mayor que aproximadamente 50% en peso y preferentemente mayor 1 55% en peso den relacion a la cantidad total de los componentes no orgánicos en la mezcla de reaccion. Esto mejora el balance de energía del todo el proceso, elimina la necesidad de evaporar soluciones altamente corrosivas, aumenta la velocidad de conversion en la etapa de hidrolisis y mejora los coeficientes de distribucion en la extraccion. El ácido obtenido puede usarse como aditivo para forrajes de animales.

公开(公告)号：MX9700300A

公开(公告)日：1997-05-31

申请号：MX9700300

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 ,  A23K01/16

Abstract: Es conocido el aislamiento de MHA a partir de una mezcla de reaccion, que se obtiene por adicion de ácido prusico HCN) a aldehído metilmercaptopropionico (MMP) e hidrolisis de la ciahidrina del aldehído metilmercaptopropionico (MMP-CH) así obtenida con ácido sulfurico poniendo la mezcla de reaccion en contacto con un disolvente orgánico esencialmente no miscible con agua en un sistema de extraccion líquido/líquido, para formar una solucion de extraccion, que contiene el disolvente y MHA transformado de la mezcla de reaccion, obteniéndose el MHA como extracto a partir de esta solucion de extraccion por concentracion. El proceso más simple y economico posible de la invencion por lo que se refiere al tratamiento de los productos de reaccion, que facilita la preparacion de un producto altamente concentrado con un contenido extraordinariamente bajo de dímeros, oligomeros y subproductos, se caracteriza porque la concentracion se realiza de tal manera que el extracto remanente contiene menos de 4% en peso de agua, preferiblemente menos de 2% en peso de agua. Suplemento de piensos, y mezclas para la suplementacion de piesos, por ejemplo, con metionina o amonio-MHA.

公开(公告)号：CH645147A5

公开(公告)日：1984-09-14

申请号：CH543880

申请日：1980-07-15

Applicant: DEGUSSA

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

IPC: D21C11/08

公开(公告)号：FI64558C

公开(公告)日：1983-12-12

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.