摘要:
A process for the preparation of fluorobenzenes of the formula I ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 are equal or different and represent H, F, Cl or alkyl having from 1 to 3 carbon atoms, at least one of these radicals being fluorine, and S.sup.1 and S.sup.2 being equal or different and represent H or a group reducing the electron density at the benzene nucleus, which comprises subjecting a compound of the formula II ##STR2## in which R.sup.1, R.sup.2, R.sup.3, S.sup.1 and S.sup.2 have the aforementioned meaning to a decarbonylation at a zeolite catalyst.
摘要:
Process for the preparation of fluorobenzenes having at least one hydrogen atom as ring substituent and, optionally, further substituents, which, independently of each other, can be chlorine, bromine, nitro, hydroxyl, C.sub.1 -C.sub.3 -alkoxy or C.sub.1 -C.sub.3 -alkyl, the number of nitro groups being not more than 2 and the number of hydroxyl groups and alkoxy groups being not more than 3 in each case, by heating the corresponding benzaldehydes, substituted by at least one flourine atom, in the presence of a catalyst, characterized in that the reaction product is immediately removed from the reaction zone.
摘要:
The present invention relates to aluminosilicates and silica gels having a low content of transition elements, to a process for their manufacture and to their use as a catalysts or catalyst supports. Said aluminosilicates or silica gels are prepared by treating them with a solution of complexing agents at a temperature of from 70.degree. to 150.degree. C. The manufacture of low-molecular-weight olefins from methanol is one possible application field of said aluminosilicates, used as a catalyst.
摘要:
A method for making crystalline aluminosilicate ZSM-34 zeolites, useful as catalysts for making C.sub.2 -C.sub.4 -olefins from methanol, from a reaction mixture containing silicon, aluminum, sodium, potassium, and an organic template compound which is (i) a salt of an ammonium compound of di-, tri-, or tetra-ethanolamine or (ii) a mixture of at least one of diethanolamine and triethanolamine with certain lower alkanols, lower alkylene diols, or lower alkyl iodides, sulfates, or p-toluenesulfonates.
摘要:
A method for the catalytic conversion of methanol and/or dimethyl ether to lower olefins with an aluminosilicate zeolite catalyst containing zirconium and/or hafnium together with manganese.
摘要:
A process for the preparation of diesters of carboxymethylphosphonic acid of the formula: (RO).sub.2 P(O)CH.sub.2 CO.sub.2 H, in which R is a straight-chain or branched alkyl radical having 1 to 20 carbon atoms, a cycloaliphatic radical having 5 to 8 carbon atoms, a phenyl or naphthyl radical which can be substituted, an aralkyl radical having 7 to 10 carbon atoms, or in which the (RO).sub.2 P group forms a ring having 2 to 5 carbon atoms which can be substituted, characterized in that dialkyl ester of 2-hydroxyethylphosphonic acid of the formula (RO).sub.2 P(O)CH.sub.2 CH.sub.2 OH, in which R has the abovementioned meaning, is reacted with oxygen in the presence of water and a catalyst which contains at least one metal selected from the platinum metals group.
摘要:
The invention relates to a process for the isomerization of halogenated thiophenes on zeolite catalysts. In this manner, in particular, 2-chlorothiophene is isomerized to 3-chlorothiophene and 2-bromothiophene is isomerized to 3-bromothiophene. Particularly suitable zeolites are synthetic zeolites of the pentasil, mordenite or faujasite type in their acid form.
摘要:
The invention provides a process for the manufacture of acetic acid, acetic aldehyde and ethanol by reaction in the gaseous phase of carbon monoxide and hydrogen in the presence of catalysts containing rhodium and optionally promoters, at elevated temperature and pressure. In this process, the temperature is raised in the starting phase, where the catalyst is heated to the working temperature T.sub.R intended for continuous operation, in a range of from T.sub.O to T.sub.R, T.sub.O being 75.degree. to 125.degree. C. below T.sub.R, continuously or in steps of 10.degree. C. at most, in a period of time of from 100 to 1,000 hours; the temperature being raised by 10.degree. C. at most within any 10 hour interval.
摘要:
Process for the recovery of catalyst in the production of ether carboxylic acids by catalytic oxidation with a suspended ether catalyst in which the reaction mixture is subjected to cross-flow filtration.