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.
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:
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:
A process for the preparation of a mixture of sucrose oxidation products which contains a salt of sucrosetricarboxylic acid and which is obtained by reaction of sucrose with oxygen in an aqueous medium in the presence of a platinum metal/active carbon catalyst at elevated temperatures and neutralization of the reaction product to convert into the salt form, which comprises the reaction being carried out discontinuously, the starting materials being heated stepwise over the course of several hours from room temperature up to 60.degree. to 95.degree. C. and then the reaction product being isolated where appropriate.The oxidation products obtained in this way have, in particular, improved washing properties.
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 a mixture containing acetic acid, acetaldehyde, and ethanol as the pricipal products, which process comprises reacting carbon monoxide and hydrogen at an elevated temperature and at an elevated pressure in the presence of a supported catalyst prepared by impregnating a carrier with a salt or complex of rhodium and, as a promotor, with at least one non-oxidic compound of an element having an atomic number of 21, 39, or 58 to 71.
摘要:
The invention relates to a process for the manufacture of glyoxylic acid esters by catalytic dehydrogenation of glycolic acid esters in the gaseous phase.