公开(公告)号：MY137678A

公开(公告)日：2009-02-27

申请号：MYPI20045307

申请日：2004-12-22

Applicant: BASF AG

Inventor： OLBERT GERHARD ,  JOHANN THORSTEN DR ,  WEBER MARKUS DR ,  LANG NEVEN DR ,  HARTH KLAUS DR ,  STROEFER ECKHARD DR ,  FIENE MARTIN DR ,  SIEGERT MARKUS DR

IPC: B01J8/02 ,  B01J8/04 ,  B01J19/24 ,  C07C45/38 ,  F28D9/00

Abstract: A process for preparing formaldehyde by gas-phase oxidation of methanol vapor by means of a gas stream comprising molecular oxygen in the presence of a fixed-bed catalyst comprising iron and molybdenum, wherein the process is carried out in a reactor ( 1 ) having heat-exchange plates ( 2 ) which are arranged in the longitudinal direction of the reactor ( 1 ) and have a spacing between them and through which a heat transfer medium flows, inlet and outlet facilities ( 3, 4 ) for the heat transfer medium to the heat-exchange plates ( 2 ) and also gaps ( 5 ) between heat-exchange plates ( 2 ) in which the fixed-bed catalyst is present and into which the methanol vapor and the gas stream comprising molecular oxygen are passed, is described.

公开(公告)号：MY141052A

公开(公告)日：2010-02-25

申请号：MYPI20040732

申请日：2004-03-03

Applicant: BASF AG

Inventor： STROEFER ECKHARD DR ,  LANG NEVEN DR ,  STEINBRENNER ULRICH DR ,  HASSE HANS PROF DR ,  OTT MICHAEL ,  GRUETZNER THOMAS

IPC: C07C45/78 ,  C07C45/00 ,  C07C45/82 ,  C07C47/058

Abstract: PROCESS FOR PREPARING HIGH-CONCENTRATION GASEOUS FORMALDEHYDE HAVING A MOLAR CH2O:H2O RATIO OF >= O.6 FROM AN AQUEOUS FORMALDEHYDE SOLUTION BY EVAPORATION OF AT LEAST PART OF THE SOLUTION, IN WHICH THE AQUEOUS FORMALDEHYDE SOLUTION IS HEATED TO A VAPORIZATION TEMPERATURE T AND THE GAS PHASE FORMED IS TAKEN OFF, WHEREIN THE EVAPORATION TEMPERATURE T OBEYS THE RELATIONSHIP:

公开(公告)号：MY139807A

公开(公告)日：2009-10-30

申请号：MYPI20050531

申请日：2005-02-14

Applicant: BASF AG

Inventor： RUMPF BERND DR ,  STROEFER ECKHARD DR ,  LANG ORTMUND ,  LANG NEVEN DR

IPC: C07C45/82 ,  C07C45/78

Abstract: A PROCESS FOR PREPARING A HIGH-CONCENTRATION FORMALDEHYDE SOLUTION BY REMOVING WATER FROM A LOWER-CONCENTRATION FORMALDEHYDE SOLUTION HAVING A FORMALDEHYDE CONTENT OF FROM 5 TO 50% BY WEIGHT, IN WHICH THE LOWER-CONCENTRATION FORMALDEHYDE SOLUTION IS FED TO A PREHEATER AND HEATED IN THE PREHEATER, DEPESSURIZED VIA A PRESSURE MAINTENANCE DEVICE AND CONCENTRATED IN A HELICAL TUBE EVAPORATOR TO GIVE A VAPOR STREAM AND THE HIGH-CONCENTRATION FORMALDEHYDE SOLUTION AS BOTTOM STREAM, WHEREIN THE HEATED LOWER-CONCENTRATION FORMALDEHYDE SOLUTION IS DEPRESSURIZED IN THE PRESSURE MAINTENANCE DEVICE TO GIVE A TWO-PHASE MIXTURE WHICH IS FED INTO THE HELICAL TUBE EVAPORATOR, IS PROPOSED.

公开(公告)号：MY138442A

公开(公告)日：2009-06-30

申请号：MYPI20053647

申请日：2005-08-04

Applicant: BASF AG

Inventor： SIEGERT MARKUS DR ,  LANG NEVEN DR ,  STROEFER ECKHARD DR ,  STAMMER ACHIM DR ,  FRIESE THORSTEN

Abstract: THE PRESENT INVENTION RELATES TO A PROCESS FOR DISTILLATIVELY REMOVING PURE TRIOXANE FROM A FEEDSTREAM (I) COMPRISING TRIOXANE IN A PROPORTION OF AT LEAST 50% BY WEIGHT, BASED ON THE TOTAL WEIGHT OF THE FEEDSTREAM (I), AND ADDITIONALLY FORMALDEHYDE AND WATER, WHICH COMPRISES FEEDING THE FEEDSTREAM I AND A FURTHER AQUEOUS STREAM (II) WHICH DOES NOT CONTAIN ANY COMPONENTS EXTRANEOUS TO THE FEEDSTREAM TO A DIVIDING WALL COLUMN (TWK1) HAVING A DIVIDING WALL TW WHICH IS ARRANGED SUBSTANTIALLY PERPENDICULARLY AND DIVIDES THE COLUMN INTERIOR INTO A FEED REGION (A1), A WITHDRAWAL REACTION (B1), AN UPPER COMBINED COLUMN REGION (C1) AND A LOWER COMBINED COLUMN REGION (D1), AND DRAWING OFF FROM THE FIRST DIVIDING WALL COLUMN (TWK1) A BOTTOM STREAM (III) COMPRISING PURE TRIOXANE AND A SIDESTREAM (IV) AT THE WITHDRAWAL REGION (B1), COMPRISING PURE WATER.FIG. 1

公开(公告)号：MY137873A

公开(公告)日：2009-03-31

申请号：MYPI20045310

申请日：2004-12-22

Applicant: BASF AG

Inventor： SIEGERT MARKUS DR ,  LANG NEVEN DR ,  STROEFER ECKHARD DR ,  STAMMER ACHIM DR ,  FRIESE THORSTEN ,  HASSE HANS PROF DR

IPC: C07D323/06

Abstract: A process for removing trioxane from a use stream I of formaldehyde, trioxane and water, by a) providing a use stream I of formaldehyde as the main component and trioxane and water as the secondary components, b) mixing the use stream I with a recycle stream VII to obtain a feed stream Ia, c) distilling the use stream Ia in a first distillation stage to obtain a stream II of formaldehyde as the main component and water as the secondary component, and a stream III of trioxane as the main component and water and formaldehyde as the secondary components, d) distilling the stream III in a second distillation stage having a pressure higher than in the first distillation stage, to obtain a stream IV of trioxane and a stream V of trioxane as the main component and water and formaldehyde as the secondary components, e) distilling the stream V in a third distillation stage to obtain a stream VI of water and the recycle stream VII of trioxane as the main component and water and formaldehyde as the secondary components.