公开(公告)号：DE3138419A1

公开(公告)日：1983-04-14

申请号：DE3138419

申请日：1981-09-26

Applicant: BASF AG

Inventor： FROMM DIETER DIPL CHEM DR ,  SCHIER ERNST-JUERGEN DIPL CHEM ,  SCHNEEHAGE HANS HENNING DIPL C ,  VODRAZKA WOLFGANG DIPL CHEM DR

IPC: B01J21/20 ,  B01J38/06 ,  C07B61/00 ,  C07D251/60 ,  C07D251/62

Abstract: In the synthesis of melamine by conversion of urea in a fluidized catalyst bed, the melamine quality is improved by reactivating the catalyst by treating it, in the fluidized bed, with gases containing steam, in the absence of oxygen, at from 250 DEG to 450 DEG C.

公开(公告)号：DE3112661A1

公开(公告)日：1982-10-14

申请号：DE3112661

申请日：1981-03-31

Applicant: BASF AG

Inventor： WAGNER ECKHART DIPL CHEM DR ,  WAGNER ULRICH DIPL PHYS DR ,  VOLKAMER KLAUS DIPL CHEM DR ,  VODRAZKA WOLFGANG DIPL CHEM DR

IPC: B01D53/14 ,  C07C7/11 ,  C07C9/04 ,  C10G5/04 ,  C10K1/16

Abstract: A process for removing condensable aliphatic hydrocarbons and acidic gases such as H2S, CO2 and COS from natural gas containing these, wherein the natural gas is initially treated with polyethylene glycol dialkyl ethers, as the solvent, in a first absorption stage to effect absorption of the condensable aliphatic hydrocarbons; the natural gas drawn off from the first absorption stage is then treated with polyethylene glycol dialkyl ethers, as the solvent, under superatmospheric pressure in a second absorption stage, the acidic gases being completely or partly absorbed; the solvent charged with the condensable aliphatic hydrocarbons which is obtained from the first absorption stage is treated with water in an extraction stage, to form a hydrocarbon phase containing the condensable aliphatic hydrocarbons and an aqueous dialkyl ether phase, and the hydrocarbon phase is separated from the aqueous dialkyl ether phase. The solvent charged with acid gases which is obtained from the second absorption stage is regenerated by expansion and/or stripping in a regeneration stage and the regenerated solvent is recycled to the absorption.

公开(公告)号：DE3011237A1

公开(公告)日：1981-10-15

申请号：DE3011237

申请日：1980-03-22

Applicant: BASF AG

Inventor： VODRAZKA WOLFGANG DIPL CHEM DR ,  KLAHR ERHARD DIPL CHEM DR ,  OPPENLAENDER KNUT DIPL CHEM DR ,  TRIESELT WOLFGANG DIPL CHEM DR ,  STUECKIGT DIETER ING GRAD ,  NEUMANN WERNER ING GRAD

IPC: C11D1/722 ,  B01J31/08 ,  C07B61/00 ,  C07C41/00 ,  C07C41/06 ,  C07C43/10 ,  C07C43/11 ,  C07C67/00 ,  C08G65/00 ,  C08G65/32 ,  C08G65/337 ,  C11D1/72

Abstract: 1. A compound of the formula I see diagramm : EP0036550,P4,F1 where R is C8 -C20 -alkyl and A is a polyalkylene oxide radical composed of from 4 to 30 alkylene oxide units, of which from 100 to 60 mole % are ethylene oxide units and from 0 to 40 mole % are 1,2-propylene oxide units or 1,2-butylene oxide units or a mixture of these.