摘要:
The invention relates to a method for the catalytic generation of formic acid at an oxygen partial pressure below 1 bar and regeneration of the catalyst used therefor, wherein a polyoxometalate-ion, serving as a catalyst, of general formula [PMo x V y O 40 ] n- at a temperature above 70°C and below 120°C is brought into contact with an alpha-hydroxy aldehyde, an alpha-hydroxycarboxylic acid, a carbohydrate, a glycoside or a polymer containing a carbon chain with at least one OH-group joined to the carbon chain repeatedly as a substituent and/or with an O-, N- or S-atom contained repeatedly in the carbon chain, in a liquid solution (12) in a vessel (10), wherein 6 ≤ x ≤ 11 and 1 ≤ y ≤ 6 and 3
摘要:
The invention relates to a process for preparing a carboxylic acid, comprising a step of bringing at least one vicinal diol or at least one vicinal polyol into contact with an atmosphere comprising oxygen, and a catalyst, and in the absence of additional solvent.
摘要:
The invention relates to a method for synthesising glycolic acid or one of the salts thereof, including the following step: placing glycerol and an oxidising agent in contact with one another in a reaction medium in the presence of a silver-based catalyst on a substrate, said substrate including a material selected from the group consisting of CeO 2 , basic Αl 2 Ο 3 optionally doped with a calcium or cerium oxide, an amphoteric resin, ZrO 2 , and a mixture of said materials. The invention also relates to the use of a silver-based catalyst on a substrate that can be used in said method.
摘要:
Objects of the present invention consist in provision of a multi-tubular reactor which can appropriately control a reaction so that formation of a hot spot or a cold spot is prevented during production of a substance with an exothermic or endothermic reaction. The present invention relates to a multi-tubular reactor (1) comprising a cylindrical shell (2), a plurality of reaction tubes (10) located in the shell, and a disk-and-doughnut type baffle (5), wherein the reaction tubes (10) are arranged so as to be in a triangular configuration, one or more of the reaction tubes (10) is/are a temperature-measuring reaction tube(s) provided with a thermometer (20), and a line (BL) through a central axis of the temperature-measuring reaction tube and a central axis of the shell (2) forms an angle from 0 to 15 degree with a line (CL) through the central axis of the temperature-measuring reaction tube and a central axis of at least one adjacent reaction tube next to the temperature-measuring reaction tube, in a cross section of the reactor (1) perpendicular to the central axis of the shell (2), as well as a design and production method thereof.
摘要:
The present invention provides a process for producing acrylic acid from glycerin with a catalyst having a prolonged life. In the process for producing acrylic acid from glycerin, a molar ratio of oxygen to glycerin in a raw material gas is set to be not lower than 0.8 and not higher than 20.
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.