公开(公告)号：DE3114268A1

公开(公告)日：1983-01-27

申请号：DE3114268

申请日：1981-04-09

Applicant: DEGUSSA

Inventor： GIESSELMANN GUENTER DR ,  GUENTHER KURT DR

IPC: B01D19/04 ,  C08K3/36 ,  C08L83/04

公开(公告)号：DE4001020A1

公开(公告)日：1991-07-18

申请号：DE4001020

申请日：1990-01-16

Applicant: DEGUSSA

Inventor： GIESSELMANN GUENTER DR ,  GUENTHER KURT DR

IPC: C07C331/20

Abstract: Alkyl isothiocyanates of the formula R-N=C=S can be prepared by reaction of N-alkyldithiocarbamates with hydrogen peroxide in aqueous phase at 95 to 130 DEG C. According to the invention, the aqueous N-alkyldithiocarbamate solution is made to react with a 20 to 40% strength by weight aqueous hydrogen peroxide solution in a volume ratio of 1 to 0.8 to 1, while maintaining a pH of 1.5 to 4.5. Preferably, the solutions are sprayed into a reactor in which the alkyl isothiocyanate formed is distilled off in vapour form and the aqueous phase containing the by-products accumulates in the reactor. The process according to the invention makes it possible to increase the space-time yield significantly because compared with the prior art process which is carried out at pH 5 to 9 a much smaller amount of sulphur is formed, thus minimising the shutdown times for the cleaning of the reactor.

公开(公告)号：CH624668A5

公开(公告)日：1981-08-14

申请号：CH89077

申请日：1977-01-25

Applicant: DEGUSSA

Inventor： GIESSELMANN GUENTER DR ,  SCHREYER GERD DR ,  VANHEERTUM RUDOLF DR

IPC: C01C3/20 ,  C07C331/16 ,  C07D277/38 ,  C07C161/04

公开(公告)号：CH618946A5

公开(公告)日：1980-08-29

申请号：CH942076

申请日：1976-07-22

Applicant: DEGUSSA

Inventor： GIESSELMANN GUENTER DR ,  SCHREYER GERD DR ,  WAGNER RUDOLF DR

IPC: C01B15/023

公开(公告)号：DE2728489A1

公开(公告)日：1979-01-18

申请号：DE2728489

申请日：1977-06-24

Applicant: DEGUSSA

Inventor： GIESSELMANN GUENTER DR ,  GUENTHER KURT DR ,  HUENE WALTER ,  SIMON WILHELM

IPC: C23F11/04 ,  C23F11/10 ,  C23F11/12 ,  C09D5/08

公开(公告)号：CH501649A

公开(公告)日：1971-01-15

申请号：CH1678268

申请日：1968-11-11

Applicant: DEGUSSA

Inventor： SCHWARZE WERNER DR ,  GIESSELMANN GUENTER DR ,  WEIGERT WOLFGANG DR

IPC: C07D55/50

公开(公告)号：AT13254T

公开(公告)日：1985-06-15

申请号：AT82101470

申请日：1982-02-26

Applicant: DEGUSSA

Inventor： GIESSELMANN GUENTER DR ,  GUENTHER KURT DR

IPC: B01D19/04

公开(公告)号：CH454813A

公开(公告)日：1968-04-30

申请号：CH553465

申请日：1965-04-21

Applicant: DEGUSSA

Inventor： SCHREYER GERD DR ,  WEIBERG OTTO DR ,  GIESSELMANN GUENTER DR

IPC: C01B15/023

公开(公告)号：DE3763363D1

公开(公告)日：1990-08-02

申请号：DE3763363

申请日：1987-03-26

Applicant: DEGUSSA

Inventor： GIESSELMANN GUENTER DR ,  HARTMANN ANDREAS ,  BRUECKNER KARL-HEINZ

IPC: A23F5/48 ,  A23L27/10 ,  B01D3/00 ,  B01D3/40 ,  B01D5/00 ,  C12G3/08 ,  A23L1/221

Abstract: A heavy concentration of volatile substances and high degree of purity are achieved in a short time in a closed system by transferring the volatile substances from a vessel containing the gas phase into a condensation vessel by means of a capillary with a small inner diameter. Preferably there is a temperature drop from the vessel containing the gas phase to the condensation vessel.

公开(公告)号：DE3616309A1

公开(公告)日：1987-11-19

申请号：DE3616309

申请日：1986-05-15

Applicant: DEGUSSA

Inventor： GIESSELMANN GUENTER DR ,  HARTMANN ANDREAS ,  BRUECKNER KARL-HEINZ

IPC: A23F5/48 ,  A23L27/10 ,  B01D3/00 ,  B01D3/40 ,  B01D5/00 ,  C12G3/08 ,  B01D1/00 ,  G01N25/14

Abstract: A heavy concentration of volatile substances and high degree of purity are achieved in a short time in a closed system by transferring the volatile substances from a vessel containing the gas phase into a condensation vessel by means of a capillary with a small inner diameter. Preferably there is a temperature drop from the vessel containing the gas phase to the condensation vessel.