Patent number: 6399816
Abstract: The invention relates to a method for selectively producing acetic acid from a gaseous feedstock of ethane, ethylene or mixtures thereof and oxygen at a high temperature. Said gaseous feedstock is brought together with a catalyst containing the elements Mo, Pd, X and Y in the gram-atomic ratios a:b:c:d in combination with oxygen: MoaPdbXcYd (I). Symbols X and Y have the following meaning: X represents one or several of the elements chosen from the group Cr, Mn, Nb, Ta, Ti, V, Te and W; Y represents one or several of the elements chosen from the group B, Al, Ga, In, Pt, Zn, Cd, Bi, Ce, Co, Rh, Ir, Cu, Ag, Au, Fe, Ru, Os, K, Rb, Cs, Mg, Ca, Sr, Ba, Nb, Zr, Hf, Ni, P, Pb, Sb, Si, Sn, Tl and U, the indices a, b, c, d and x represent the gram-atomic ratios of the corresponding elements: a=1, b=0.0001 to 0.01, c=0.4 to 1 and d=0.005 to 1. The space-time yield in the oxidation to acetic acid using the inventive method is >150 kg/hm3.
Type:
Grant
Filed:
June 5, 2000
Date of Patent:
June 4, 2002
Assignee:
Celanese Chemicals Europe GmbH
Inventors:
Holger Borchert, Uwe Dingerdissen
Patent number: 6274765
Abstract: A process is disclosed for selectively preparing acetic acid from a gaseous feed of ethane, ethylene or mixtures thereof, as well as oxygen, at an increased temperature, on a catalyst which contains the elements W, X, Y and Z in the gram-atom ratio a:b:c:d, associated with oxygen. In the formula WaXbYcZd (I), X stands for one or several elements selected from the group Pd, Pt, Ag and/or Au; Y stands for one or several elements selected from the group V, Nb, Cr, Mn, Fe, Sn, Sb, Cu, Zn, U, Ni and/or Bi; Z stands for one or several elements selected from the group Li, Na, K, Rb, Cs, Be, Mg, Ca, Sr, Ba, Sc, Y, La, Ti, Zr, Hf, Ru, Os, Co, Rh, Ir, B, Al, Ga, In, Tl, Si, Ge, Pb, P, As and/or Te; a equals 1, b is a number higher than 0, c is a number higher than 0, and d is a number from 0 to 2. Also disclosed is said catalyst.
Type:
Grant
Filed:
November 10, 1999
Date of Patent:
August 14, 2001
Assignee:
Hoechst Research & Technology Deutschland GmbH & Co.
KG
Inventors:
Holger Borchert, Uwe Dingerdissen, Ranier Roesky
Patent number: 6194610
Abstract: The present invention relates to a process for the selective preparation of acetic acid from a gaseous feed comprising ethane, ethylene or mixtures thereof plus oxygen at elevated temperature, which comprises bringing the gaseous feed into contact with a catalyst comprising the elements Mo, Pd, X and Y in gram atom ratios a:b:c:d in combination with oxygen
MoaPdbXcYd (I)
where the symbols X and Y have the following meanings:
X is one or more elements selected from the group consisting of: Cr, Mn, Nb, Ta, Ti, V, Te and/or W, in particular Nb, V and W;
Y is one or more elements selected from the group consisting of: B, Al, Ga, In, Pt, Zn, Cd, Bi, Ce, Co, Cu, Rh, Ir, Au, Ag, Fe, Ru, Os, K, Rb, Cs, Mg, Ca, Sr, Ba, Zr, Hf, Ni, P, Pb, Sb, Si, Sn, TI and U, in particular Ca, Sb, Te and Li. The present invention further provides a catalyst for the selective preparation of acetic acid comprising the elements Mo, Pd, X and Y in the gram atom ratios a:b:c:d in combination with oxygen.
Type:
Grant
Filed:
January 28, 1999
Date of Patent:
February 27, 2001
Assignee:
Aventis Research & Technologies GmbH & Co. KG
Inventors:
Holger Borchert, Uwe Dingerdissen
Patent number: 6156948
Abstract: This invention relates to a method for the selective preparation of a styrene of formula (1) ##STR1## by reacting an acetophenone of formula (1) ##STR2## with hydrogen in the presence of a catalyst containing one of several oxides, in particular metal oxides, wherein the oxide contains an element form the groups Ia, IIa, IIIa, IVa, VIa, Ib, IIb, IVb, Vb, VIb, and/or VIII or an element from the lanthanide group. The catalyst contains preferably on or several oxides of the formula ZnM.sup.1.sub.b M.sup.2.sub.c O.sub.x, where M.sup.1 stands for at least one element from the Al, Zr, Ti and Si group, M.sup.2 stands for at least one element from the Cd, Cu, Ag, Ni, Co, Fe, Mn, Cr, Mo, Ta, Sc, W, V, Nb, Hf, Yt, B, In, Zn, Pb, Bi Se, Ga, Ge, Sb, As, Te group, or an element from the lanthanides, b=0-20, c=0-3, x corresponds to the number of oxygen atoms required for stoechiometric compensation, which results in accordance with the oxidation states of Zn, M.sup.1 and M.sup.2 or oxides of formula M.sup.3.sub.2 M.sup.
Type:
Grant
Filed:
July 27, 1999
Date of Patent:
December 5, 2000
Assignee:
Aventis Research & Technologies GmbH & Co. KG
Inventors:
Rainer Roesky, Holger Borchert, Uwe Dingerdissen
Patent number: 6034270
Abstract: A process for the selective preparation of acetic acid from a gaseous feed comprising ethane, ethylene or mixtures thereof plus oxygen at elevated temperature, which comprises bringing the gaseous feed into contact with a catalyst comprising the elements Mo, Pd, Re, X and Y in gram atom ratios a:b:c:d:e in combination with oxygenMo.sub.a Pd.sub.b Re.sub.c X.sub.d Y.sub.e (I)where the symbols X, Y have the following meanings:X=Cr, Mn, Nb, B, Ta, Ti, V and/or WY=Bi, Ce, Co, Cu, Te, Fe, Li, K, Na, Rb, Be, Mg, Ca, Sr, Ba, Ni, P, Pb, Sb, Si, Sn, Tl and/or U;the indices a, b, c, d and e are the gram atom ratios of the corresponding elements, wherea=1, b>0, c>0, d=0.05-2, e=0-3.
Type:
Grant
Filed:
November 19, 1998
Date of Patent:
March 7, 2000
Assignee:
Hoechst Research & Technology Deutschland GmbH & Co. KG
Inventors:
Holger Borchert, Uwe Dingerdissen, Jens Weiguny