公开(公告)号：BRPI0417455A

公开(公告)日：2007-05-22

申请号：BRPI0417455

申请日：2004-12-23

Applicant: BASF AG

Inventor： OLBERT GERHARD ,  JOHANN THORSTEN ,  WEBER MARKUS ,  LANG NEVEN ,  FER ECKARD STR ,  FIENE MARTIN ,  SIEGERT MARKUS

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.