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Patent Agency Ranking
公开(公告)号：DE2449780A1
公开(公告)日：1976-04-29
申请号：DE2449780
申请日：1974-10-19
Applicant: BASF AG
Inventor： ENGELBACH HEINZ DIPL CHEM DR , KRABETZ RICHARD DIPL CHEM DR , DUEMBGEN GERD DIPL CHEM DR , WILLERSINN CARL-HEINZ DIPL CHE , FREY WALTER DIPL ING DR , LEBERT ULRICH DIPL CHEM DR , THIESSEN FRITZ DIPL CHEM DR
Abstract: In the oxidation of propylene and/or acrolein, high-boiling or non-volatile byproducts are separated from the solvents used for absorbing the acrylic acid by treating the said solvents laden with byproducts with the hot reaction gases in such amounts that the major portion of the solvents evaporates, the residual solvent containing a high percentage of said byproducts then being discarded or worked up.
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公开(公告)号：DE2513405A1
公开(公告)日：1976-10-14
申请号：DE2513405
申请日：1975-03-26
Applicant: BASF AG
Inventor： ENGELBACH HEINZ DIPL CHEM DR , KRABETZ RICHARD DIPL CHEM DR , DUEMBGEN GERD DIPL CHEM DR , LEBERT ULRICH DIPL CHEM DR , THIESSEN FRITZ DIPL CHEM DR , SCHAUER HORST DIPL ING , ENGERT GERD-JUERGEN DIPL CHEM
Abstract: In the novel prepn of acrylic acid by the oxidation of propylene with O2-contg. gases in the presence of two different catalysts placed one behind the other in a tubular reactor, at 200-400 degrees C, cooling the reactor is effected in two separate zones such that (a) the temp. of the cooling medium, in the direction of reaction gas flow in the first zone, where propylene is oxidised to acrolein, is 20-150 degrees C higher than the temp. of the cooling medium in the second zone where the acrolein formed in the presence of the first catalyst, is oxidised in the presence of the other catalyst to acrylic acid, (b) the temp. of the cooling medium within both zones increases only by up to 50 degrees C and (c) the reaction gases before reaching the second catalyst are cooled to the temp. of the second cooling medium in an intermediate space filled with the second reactor. Post-combination of the reaction gases in the first catalyst stage is obviated. Plant requirements are reduced and the process affords good control at optimal acrylic acid yield.
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公开(公告)号：DE2613244A1
公开(公告)日：1977-10-27
申请号：DE2613244
申请日：1976-03-27
Applicant: BASF AG
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公开(公告)号：DE2626887A1
公开(公告)日：1977-12-22
申请号：DE2626887
申请日：1976-06-16
Applicant: BASF AG
Inventor： KRABETZ RICHARD DIPL CHEM DR , HERRMANN WALTER DIPL ING DR , SCHOLZ NORBERT ING GRAD , ENGELBACH HEINZ DIPL CHEM DR , ENGERT GERD-JUERGEN DIPL CHEM , WILLERSINN CARL-HEINZ DIPL CHE , DUEMBGEN GERD DIPL CHEM DR , THIESSEN FRITZ DIPL CHEM DR
IPC: B01J23/00 , B01J23/24 , B01J23/28 , B01J23/30 , B01J23/31 , B01J23/34 , B01J23/88 , B01J23/89 , B01J37/02 , C07B61/00 , C07C51/00 , C07C51/25 , C07C57/055 , C07C67/00
Abstract: Catalysts which consist of a molded carrier, the surface of which is coated with an active catalyst composition of the general formula Mo12AaBbCcDdOx, where A is V and/or W, B is Cu and/or Fe and/or Mn and/or Ni and/or Cr, C is Nb and/or Ta and/or Bi and/or Sb and/or Sn and/or Th and/or Ce and/or U, D is Li and/or Na and/or K and/or Rb and/or Cs and/or Tl and a is from 0.1 to 18, b is from 0 to 8, c is from 0 to 10, d is from 0 to 2 and x is from 36 to 135, which are particularly active and selective for the oxidation of acrolein and methacrolein with oxygen-containing gases to give acrylic acid and methacrylic acid, respectively, are obtained by first manufacturing the catalyst composition, before applying it to the carrier, from thermally easily decomposed salts of the components by mixing aqueous solutions, slurries or moist solid masses of the salts of the components, drying the mixture and calcining the dried composition at from 140 DEG to 600 DEG C., then milling it to a particle size of less than 150 mu m and thereafter applying it, as a mixture with water, as a layer from 10 to 1,500 mu m thick, to the premolded carrier, which has a rough surface.
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公开(公告)号：DE2436818A1
公开(公告)日：1976-02-19
申请号：DE2436818
申请日：1974-07-31
Applicant: BASF AG
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