公开(公告)号：DE59705162D1

公开(公告)日：2001-12-06

申请号：DE59705162

申请日：1997-07-10

Applicant: DEGUSSA

Inventor： SAUER DR ,  BOECK DR ,  VON HIPPEL DR ,  BURKHARDT WERNER ,  RAUTENBERG DR ,  ARNTZ DR ,  HOFEN WILLI

IPC: B01J23/04 ,  B01J23/30 ,  B01J35/10 ,  B01J37/02 ,  C07B61/00 ,  C07C319/08 ,  C07C321/04

Abstract: In a moulded aluminium oxide catalyst containing an alkali tungstate s promoter, used for synthesis of methyl mercaptan, the promoter is caesium tungstate (I) in an amount > 15 to 40 wt.% with respect to the total amount of catalyst.

公开(公告)号：DE59703013D1

公开(公告)日：2001-03-29

申请号：DE59703013

申请日：1997-12-18

Applicant: DEGUSSA

Inventor： HOFEN WILLI ,  BOECK DR ,  RAUTENBERG DR ,  SAUER DR ,  ARNTZ DR ,  GOEDECKE DR ,  TAUGNER WOLFGANG ,  SONNENSCHEIN DR

IPC: C07C319/02 ,  C07C319/28 ,  C07C321/04

公开(公告)号：DE59510436D1

公开(公告)日：2002-12-05

申请号：DE59510436

申请日：1995-08-23

Applicant: DEGUSSA

Inventor： HOEPP DR ,  ARNTZ DR ,  BOECK DR ,  BOSSE-PLOIS ANDREAS ,  RAIBLE KLAUS

IPC: B01J31/10 ,  C07B61/00 ,  C07D317/12

Abstract: Prepn. of 2-vinyl-1,3-dioxolane, comprises the following steps: (1) reaction of acrolein with ethylene glycol at less than 50 degrees C in the presence of a solid acid catalyst; (2) extraction of the reaction mixt. with an organic solvent having a b.pt. greater than 130 degrees C, in which ethylene glycol is essentially insoluble; and (3) distilln. of the aq. phase contg. ethylene glycol and the organic phase contg. the dioxolane.

公开(公告)号：DE59708177D1

公开(公告)日：2002-10-17

申请号：DE59708177

申请日：1997-07-10

Applicant: DEGUSSA

Inventor： SAUER DR ,  VON HIPPEL DR ,  ARNTZ DR ,  BOECK DR

IPC: B01J23/04 ,  B01J23/30 ,  B01J37/02 ,  C07B61/00 ,  C07C319/00 ,  C07C319/08 ,  C07C321/04

Abstract: In an aluminium oxide (I) catalyst for the synthesis of methyl mercaptan containing 5-25 wt.% potassium tungstate (II) as promoter with respect to active (I), (II) is deposited in 2 portions. (I) is first coated with the first portion of (II) by impregnation in excess aqueous solution, then dried at elevated temperature. Then the second portion is applied by pore volume impregnation. The catalyst precursor is then dried at elevated temperature and calcined at 200-600 degrees C.

公开(公告)号：DE59703011D1

公开(公告)日：2001-03-29

申请号：DE59703011

申请日：1997-12-09

Applicant: DEGUSSA

Inventor： HOFEN WILLI ,  BOECK DR ,  RAUTENBERG DR ,  SAUER DR ,  ARNTZ DR ,  GOEDECKE DR ,  TAUGNER WOLFGANG ,  SONNENSCHEIN DR

IPC: B01J21/04 ,  B01J23/30 ,  C07B61/00 ,  C07C319/08 ,  C07C321/04

Abstract: A process for the continuous production of methyl-mercaptan (I) comprises (i) reacting a mixture of methanol and hydrogen sulphide (H2S) in the vapour phase at 300-500 degrees C and 5-15 bar on an alumina-based catalyst bed and (ii) separating (I) from the gas mixture obtained by absorption and distillation, with recycling of unreacted methanol and H2S, removal of inert gas and waste water, and replacement of used methanol and H2S. The starting gas mixture is obtained by (a) compressing fresh H2S to an intermediate pressure (P1) with addition of liquid methanol, (b) adding the recycled H2S and compressing the mixture to operating pressure (P2), (c) adding more methanol in the form of vapour to give a compressed mixture with a mol ratio of (H2S):(methanol) = 1.1-3, (d) preheating the gas mixture to 150-200 degrees C, (e) heating to reaction temperature using the heat of reaction released on the catalyst and (f) reaction on the catalyst bed.