摘要:
The present invention relates to an improved process for the preparation of carboxylic acids, specifically by the reaction of ethylenically unsaturated compounds with carbon monoxide and water, in the presence of catalyst compositions essentially comprising iridium compounds and complexes, together with an iodide promoter, the improvement being the provision of at least 50 percent by weight of the iridium in the reaction solution in a highly catalytically active form as a species having infrared absorption bands at 2098 cm.sup.-.sup.1 (vs), 2155 cm.sup.-.sup.1 (w), 2180 cm.sup.-.sup.1 (vw, br). By monitoring the infrared absorption spectra of reacting solutions and following the magnitude of the 2098 cm.sup.-.sup.1 band the operating conditions are adjusted so that this band is present in 50 percent or more concentration relative to the infrared absorption spectral bands of the other iridium species in solution. Through this monitoring and control process significantly increased reactor productivity to carboxylic acids is achieved.
摘要:
The present invention is directed to an analytical method for measuring the concentration of an N-(phosphonomethyl)iminodiacetic acid (“NPMIDA”) substrate, an N-(phosphonomethyl)glycine product, formaldehyde, formic acid, N-methyl-N-(phosphonomethyl)glycine (“NMG”), N-methyl-aminomethylphosphonic acid (MAMPA) or aminomethylphosphonic acid (“AMPA”)) in an aqueous mixture thereof, using infrared spectroscopy. The present invention is also directed to a process for oxidizing an N-(phosphonomethyl)iminodiacetic acid substrate to form a N-(phosphonomethyl)glycine product, and as part of the process, measuring the concentration of at least one reactant, product or byproduct of the oxidation reaction using the analytical method of the present invention and controlling the oxidation process in response to the measurement taken.
摘要:
The present invention relates to an improved process for the preparation of organic carboxylic acid anhydrides, specifically by the reaction of ethylenically unsaturated compounds having 2 to 30 carbon atoms with carbon monoxide and carboxylic acids or substances which yield carboxylic acids under reaction conditions at a temperature of 50.degree. C to 300.degree. C and a partial pressure of carbon monoxide of from 1 to 200 atm. in the presence of a catalyst composition essentially comprised of1. a cobalt or nickel compound, and2. an iodide component subject to the conditions that the atomic ratio of iodide to cobalt or nickel is from 1:1 to 300:1,3. a catalyst preserver or regenerator component selected from the group consisting of hydrogen or a compound capable of giving rise to hydrogen under the reaction conditions. The process is particularly suited to the production of propionic anhydride.
摘要:
The present invention relates to an improved process for the preparation of propionic acid, specifically by the reaction of ethylene with carbon monoxide and water at mild pressure, in the presence of catalyst compositions essentially comprising critical proportions of cobalt compounds with an iodide promoter.
摘要:
The complexes [Ir(CO).sub.3 I], [HIr(CO).sub.3 I.sub.2 ], [HIr(CO).sub.2 I.sub.2 (H.sub.2 O)], [RIr(CO).sub.2 I.sub.2 ], [(RCO)Ir(CO).sub.2 I.sub.2 ] where R is an alkyl radical, are described. Processes for preparing the aforesaid complexes are described and in addition a new process for preparation of [Ir(CO).sub.3 I.sub.3 ] is described.
摘要翻译:配合物[Ir(CO)3I],[HIr(CO)3I2],[HIr(CO)2I2(H2O)],[RIr(CO)2I2],[(RCO)Ir(CO) 描述了烷基。 描述了制备上述配合物的方法,并描述了制备[Ir(CO)3 I 3]的新方法。
摘要:
3,3-Dimethylbutanal is prepared from 3,3-dimethylbutanol. Intermediate 3,3-dimethylbutanol is obtained by reacting ethylene, isopropylene and a mineral acid to produce a 3,3-dimethylbutyl ester which is hydrolyzed to the alcohol. The hydrolysis step is effectively carried out by reactive distillation. Alternatively, 3,3-dimethylbutanal is prepared from 3,3-dimethylbutanol obtained by reduction of the corresponding carboxylic acid or 1,2-epoxy-3,3-dimethylbutane, or by hydrolysis of 1-halo-3,3-dimethylbutane. Fixed bed gas phase and stirred tank liquid phase processes are provided for converting 3,3-dimethylbutanol to 3,3-dimethylbutanal by catalytic dehydrogenation.
摘要:
A process for the production of N-phosphonomethyl glycine by the oxidation of N-phosphonomethylimino diacetic acid utilizing a molecular oxygen-containing gas as the oxidant in the presence of a catalyst consisting essentially of activated carbon. The N-phosphonomethyl glycine produced is useful as a herbicide or plant growth regulant.
摘要:
3,3-Dimethylbutanal is prepared from 3,3-dimethybutanol. Intermediate 3,3-dimethylbutanol is obtained by reacting ethylene, isopropylene and a mineral acid to produce a 3,3-dimethylbutyl ester which is hydrolyzed to the alcohol. The hydrolysis step is effectively carried out by reactive distillation. Alternatively, 3,3-dimethylbutanal is prepared from 3,3-dimethylbutanol obtained by reduction of the corresponding carboxylic acid or 1,2-epoxy-3,3-dimethylbutane, or by hydrolysis of 1-halo-3,3-dimethylbutane. Fixed bed gas phase and stirred tank liquid phase processes are provided for converted 3,3-dimethylbutanol to 3,3-dimethylbutanal by catalytic dehydrogenation.
摘要:
3,3-Dimethylbutanal is prepared from 3,3-dimethylbutanol. Intermediate 3,3-dimethylbutanol is obtained by reacting ethylene, isopropylene and a mineral acid to produce a 3,3-dimethylbutyl ester which is hydrolyzed to the alcohol. The hydrolysis step is effectively carried out by reactive distillation. Alternatively, 3,3-dimethylbutanal is prepared from 3,3-dimethylbutanol obtained by reduction of the corresponding carboxylic acid or 1,2-epoxy-3,3-dimethylbutane, or by hydrolysis of 1-halo-3,3-dimethylbutane. Fixed bed gas phase and stirred tank liquid phase processes are provided for converted 3,3-dimethylbutanol to 3,3-dimethylbutanal by catalytic dehydrogenation.
摘要:
A catalyst system having high activity and selectivity to carbonylation products comprises a rhodium-containing catalytically active component and a halogen-containing promoter component, the halogen being selected from the group consisting of bromine, iodine, bromide compounds, and iodide compounds.