公开(公告)号：DE50108530D1

公开(公告)日：2006-02-02

申请号：DE50108530

申请日：2001-10-09

Applicant: DEGUSSA

Inventor： KROPFGANS DR ,  RAULEDER DR ,  SCHWARZ DR ,  KORTE DR

IPC: C07F7/18 ,  C07F7/20

公开(公告)号：DE59709470D1

公开(公告)日：2003-04-17

申请号：DE59709470

申请日：1997-07-07

Applicant: DEGUSSA

Inventor： BADE DR ,  SCHOEN DR ,  BURKHARD JOHN ,  BOLLENRATH DR ,  HOFMANN NORBERT ,  KORTE DR ,  RAULEDER DR ,  TANGER DR

IPC: B01J23/44 ,  C07B61/00 ,  C07F7/08 ,  C07F7/12 ,  C07F7/14 ,  C07F7/18

Abstract: A process for the continuous production of 3-halogen-propyl-organosilanes of formula RbH3-a-bXaSiCH2CH2CH2Y (I) is claimed by reaction of an alkyl halide (II) and a silane (III) containing at least one Si-H bond whereby a partial conversion of 10-80 % (w.r.t. the minor component) is achieved. In formula (I), R = methyl, ethyl, propyl, methoxy, ethoxy or propoxy X,Y = F, Cl, Br or I a,b, = 0-3 a+b = 1,2 or 3. Preferably the degree of conversion is 30-60 % and byproduct propene is separated off. The molar ratio of silane (III) to alkyl halide (II) is 0.5-1.5, preferably 0.5-1. The unconverted reactants are separated from the product and recycled to he reaction. The reaction occurs in the liquid phase at 60-160, preferably 80-140 degrees C in the presence of a heterogeneous catalyst for 1-500 minutes. (I) is 3-chloropropyltrichlorosilane or 3-chloropropylmethyl dichlorosilane prepared by reaction of alkyl chloride with trichlorosilane or methyl dichlorosilane. The degree of conversion resulting from the reaction kinetics and catalyst is controlled by temperature and/or residence time in the reactor.

公开(公告)号：DE59701502D1

公开(公告)日：2000-05-31

申请号：DE59701502

申请日：1997-08-21

Applicant: DEGUSSA

Inventor： JELKO STEFAN ,  SCHOENGEN ANTON ,  KORTE DR ,  FRANZ DR ,  SREBNY DR ,  JOSTMANN DR ,  STEDING DR

IPC: C07C67/39 ,  C07C69/76 ,  C07C69/82

Abstract: A method for the oxidation of p-xylene (pX) and methyl p-toluate (pTE) with oxygen-containing gases in the Witten- Hercules process for production of dimethyl terephthalate (DMT) in at least two successive part-stages in presence of a catalyst. The process comprises (a) at least one pX-rich part-stage in which part of the pX, and optionally recycled products with oxidisable components from further stages in the DMT process, is/are oxidised in presence of 5-30 wt% pTE (based on the oxidation mixture in this stage), and/or (b) at least one pTE- rich part-stage in which pTE and/or p-toluic acid (pTS), and optionally recycled products, is/are oxidised in presence of 2-30 wt% pX (based on pTE + pTS).