Abstract:
PROBLEM TO BE SOLVED: To improve a method of purifying a raw melt of at least one monomer by crystallization. SOLUTION: There is provided the method for the purification of a crude melt of at least one monomer by crystallization, in which the crude melt to be purified is subjected to a suspension crystallization, the monomer crystals produced during the suspension crystallization and suspended in the residual melt are separated from the residual melt by using a first mechanical separation operation and, in at least one further crystallization stage, the residual melt remaining after the first mechanical separation operation and/or the monomer crystals which have been separated off and if necessary washed are further purified after they have been melted, wherein the residual melt and/or the remelted monomer crystals are subjected to at least one further mechanical solid/liquid separation operation on their way into the one or more further crystallization stages. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method for preventing an oxidation reactor from being fed with a feed gas mixture whose composition is an explosive one in a continuously operated heterogeneously catalyzed gas-phase partial oxidation of at least one organic compound in the oxidation reactor whose feed gas mixture comprises, in addition to the at least one organic compound to be partially oxidized and molecular oxygen as an oxidizing agent, at least one diluent gas substantially inert under the conditions of a heterogeneously catalyzed gas-phase partial oxidation. SOLUTION: In a method for safely operating the heterogeneously catalyzed gas-phase partial oxidation of at least one organic compound in the oxidation reactor, an explosion diagram for the feed gas mixture is stored in a computer while serving as the basis of a cut-off mechanism. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a heterogeneous catalytic gaseous phase oxidation method converting acrolein to acrylic acid, eliminating faults of technical level, and to provide a tube bundle reactor. SOLUTION: There is provided a heterogeneous catalytic gaseous phase oxidation method converting acrolein to acrylic acid, wherein the active materials of the catalyst is a specific multi-element oxidized material produced by a specific heat treatment method, and a bundle reactor comprising a specific number of catalyst tubes, wherein the catalytic tubes are filled with a filler, the catalyst contains as the active materials specific multi-element oxidized materials produced by a specific thermal treatment method, in that case, charge of the catalyst tube relating to partial oxidation converting acrolein to acrylic acid is performed on specific conditions to 12 catalyst tubes sampled at random and, as the standard of the activity of the catalyst tube filler, a temperature to be possessed by a specific salt bath is used. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a process for heterogeneously catalyzed partial gas phase oxidation of propylene to form acrylic acid in the presence of propane as an inert diluent gas.SOLUTION: A starting reaction gas mixture comprising propylene, molecular oxygen, and inert diluent gas propane with a molar O2:C3H6 ratio of 1 or greater is conducted through at least one first catalyst bed whose catalysts have at least one multimetal oxide comprising Mo, Fe and Bi, and a product gas mixture is made with the byproduct cyclopropane content of 3 mol% or less based on the molar amount of propane contained in the starting reaction gas mixture 1, to proceed to a further reaction.
Abstract translation:要解决的问题:提供在丙烷作为惰性稀释气体存在下异丙烯催化的丙烯部分气相氧化形成丙烯酸的方法。溶液:包含丙烯,分子氧和惰性稀释气体的起始反应气体混合物 具有1或更大的O 2 :C 3 H 6摩尔比的丙烷通过至少一个第一催化剂床进行,其催化剂具有至少一种包含Mo,Fe和Bi的多元氧化物,产物气体混合物的副产物环丙烷含量为3 基于起始反应气体混合物1中所含的丙烷摩尔量的摩尔%以下,进行进一步的反应。
Abstract:
PROBLEM TO BE SOLVED: To provide a reaction vessel having high resistance to a thermal cycle (high resistance to long time embrittlement, carburization, metal dusting) and capable of reducing undesired catalysis effects, and to provide a method for a serial partial dehydrogenation of hydrocarbon by a heterogeneous catalyst with using the reaction vessel.SOLUTION: In a catalytic dehydrogenation of a hydrocarbon such as propane to an unsaturated hydrocarbon such as propene, a reaction vessel of which an inner surface of a reaction chamber consists of steel containing Cr: 18 to 30 mass%, Ni: 9 to 37 mass%, Si: 1 to 4 mass% and the like and an outer surface at opposite side of the reaction chamber is made from a composite material metal-plated on a steel containing Cr: 15 to 20 mass%, Ni: 6 to 18 mass%, Si: 0 to 0.8 mass% and the like directly or through layers of copper, nickel or copper and nickel is used. A method of a serial partial dehydrogenation of hydrocarbon by a heterogeneous catalyst with using the reaction vessel is provided.
Abstract:
PROBLEM TO BE SOLVED: To provide a method of separating methacrolein from a liquid phase P containing acrylic acid as a main component and an aimed product and methacrolein as an accessory component.SOLUTION: The separation is conducted in crystallization and acrylic acid in the formed crystal material and methacrolein in a remaining mother liquid are concentrated.
Abstract:
PROBLEM TO BE SOLVED: To provide a long-term implementation method of a continuously implemented partial heterogeneous catalytic dehydrogenation of a to-be-dehydrogenated hydrocarbon.SOLUTION: A reactive gas mixture flow including a to-be-dehydrogenated hydrocarbon of a starting molar quantity HC is transmitted through a total catalyst bed including a dehydrogenation catalyst at a total sum M, and in a case where the implementation period proliferates, the deactivation of the total catalyst bed is attenuated by decreasing the conversion contribution of the first of three zones of the dehydrogenation catalyst of the total sum M along the fluidizing direction thereof, by increasing the conversion contribution of the last of the three zones of the dehydrogenation catalyst of the total sum M along the fluidizing direction thereof, and by maximizing the conversion contribution of the second of the three zones of the dehydrogenation catalyst of the total sum M along the fluidizing direction thereof.