摘要:
A process for preparing a carboxylic acid, by oxidative cleavage of at least one vicinal diol, or an epoxide, wherein the reaction is carried out in the presence of a catalyst and of an oxidizing agent and in the absence of solvent.
摘要:
A method for producing polyoxyalkylene alkyl ether carboxylic acid or a salt thereof includes an oxidation reaction process of oxidizing polyoxyalkylene alkyl ether with oxygen by supplying an oxygen-containing gas to a suspension or a solution that has a depth of 200 mm or more and includes polyoxyalkylene alkyl ether. In the oxidation reaction process, a supply rate of the oxygen-containing gas is reduced in a period in which the conversion is greater than or equal to 50% and less than 70%.
摘要:
A process for producing methacrolein and/or methacrylic acid, including feeding a raw gas containing gaseous t-butanol to a fixed bed multitubular reactor having a dehydration catalyst layer and an oxidation catalyst layer arranged in this order from the raw gas inlet side toward the outlet side to thereby carry out dehydration reaction and vapor-phase catalytic oxidation reaction so as to produce methacrolein and/or methacrylic acid, characterized in that the length of catalyst packed of the dehydration catalyst layer is in the range of 3 to 20% of the length of catalyst packed of the oxidation catalyst layer. In this process, even when the temperature of reaction bath is relatively low (about 355°C), the conventional yield of about 80% can be raised to 81-82%.
摘要:
The invention concerns a method for making carboxylic acids by oxidizing an alkyl hydroperoxide compound. More particularly, the invention concerns oxidation of a cyclohexyl peroxide into an adipic acid with an oxidizing agent containing molecular oxygen or an oxygen-containing gas in the presence of an oxidation catalyst including a metal belonging to the groups of transition metals.
摘要:
A process of producing unsaturated aldehydes and unsaturated carboxylic acids by vapor-phase catalytic oxidation of one or more compounds selected from propylene, isobutylene, t-butanol and methyl-t-butyl ether with molecular oxygen or molecular oxygen-containing gas, using a fixed bed shell-and-tube type reactor filled with shaped catalysts, which process is characterized in that plural shaped catalysts, which differ in: [I] content of inert component and [II] one or more of (a) occupation volume, (b) kind of alkali metal(s) present, (c) amount of alkali metal(s) present and (d) calcining temperature, are used in each of the reaction tubes such that the catalytic activity level rises from the reactant gas-inlet side of each reaction tube toward the outlet side.
摘要:
A process for producing a supported catalyst for the synthesis of methacrolein and methacrylic acid in which a catalytic active substance comprising a composite oxide containing molybdenum and bismuth as essential components is supported on the inside surface and/or the outside surface of an inert carrier, which comprises the steps of drying a mixed solution or an aqueous slurry containing the compounds of the elements constituting the catalytic active substance, subjecting the dried product to a primary calcination at a temperature in a range of 200-400°C to form a catalytic active substance precursor, comminuting the obtained catalytic active substance precursor to such an extent that the medium particle size in the volume-based particle size distribution becomes 10 µm or less, supporting the comminution product on an inert carrier, and subjecting it to a secondary calcination at a temperature which is 100°C or more higher than the primary calcination temperature.