摘要:
A catalyst for use in the production of an unsaturated aldehyde and/or an unsaturated carboxylic acid, the catalyst comparing (or, preferably, being composed of) a mixed oxide containing molybdenum, bismuth and iron, which has improved mechanical strength, is produced by a method including the steps of (1) drying an aqueous solution or an aqueous slurry containing raw materials of the catalyst and then firstly calcining a dried product in a molecular oxygen-containing gas atmosphere to obtain a calcined product; (2) heating the calcined product obtained in Step (1) in the presence of a reducing material to obtain a reduced product having a mass loss of 0.05 to 6%; and (3) secondly calcining the reduced product obtained in Step (2) in a molecular oxygen-containing gas atmosphere.
摘要:
Disclosed is a process for producing unsaturated aldehydes and/or unsaturated acids from olefins or alkanes in a fixed bed shell-and-tube heat exchanger-type reactor by catalytic vapor phase oxidation. A heat exchanger-type reactor for use in such a process is also disclosed. The process utilizes at least one first-step reaction zone and a second-step reaction zone that is divided into two or more shell spaces by at least one partition. The process may be applied to a single-step process for producing unsaturated acids from alkanes or alkenes.
摘要:
A fixed-bed multitubular reactor, comprising a plurality of reaction tubes (3) filled with a catalyst and catalyst temperature measurers (4) measuring the temperatures of the reaction tubes near the radical center parts thereof. The catalyst temperature measurer (4) is installed in each of a part of the plurality of reaction tubes (3), and the measurement positions thereof are differentiated from each other in the longitudinal direction of the reaction tubes (3).
摘要:
The present invention has an object to provide a production method of acrolein capable of producing acrolein with suppressing the yield change with time. The production method of the invention is that glycerin is dehydrated under coexistence with a catalyst having crystalline metallosilicates containing at least one kind of T atoms and 15% by mass or less of a binder, and the Si atoms to T atoms ratio (Si/T) of the catalyst is 800 or less.
摘要翻译:本发明的目的在于提供能够抑制产率随时间的变化而产生丙烯醛的丙烯醛的制造方法。 本发明的制造方法是在与含有至少一种T原子和15质量%以下的粘结剂的结晶性金属硅酸盐的催化剂共存的同时脱水,Si原子与T原子的比(Si / T )为800以下。
摘要:
Disclosed is a method for producing a catalyst, in which physical properties of a dried material or a calcined material in a production process of the catalyst are stable and a change in at least one of a catalyst activity and a selectivity to a target product is small and hence reproducibility of the catalyst is excellent. The present invention is a method for producing a catalyst containing molybdenum, bismuth, and iron, which contains the steps of washing a surface of at least one device equipped in an apparatus for the production of catalyst, to which a solid matter adheres, with a basic solution, and producing the catalyst with the apparatus for the production of catalyst thus washed.
摘要:
A process for purifying an aqueous solution to obtain purified gaseous acrolein by introducing the aqueous solution into a distillation column equipped at its base with at least one boiler and at its top with at least one condenser, withdrawing a liquid mixture essentially containing water at the base of the distillation column, withdrawing a gas essentially containing acrolein and water at the top of the distillation column, cooling the gas mixture withdrawn at the top of the distillation column in the condenser, to a temperature which makes it possible to obtain, on the one hand, an aqueous condensate and, on the other hand, an acrolein-rich gas mixture, and withdrawing the acrolein-rich gas mixture.
摘要:
A process for preparing acrolein, or acrylic acid or a mixture thereof as a target product from propane, in which propane is partially dehydrogenated under heterogeneous catalysis in a reaction zone A, molecular hydrogen thus formed is incinerated partly to water and the product gas A thus formed in reaction zone A is used without secondary component removal to charge a reaction zone B in which propylene present in product gas A is partially oxidized to the target product. From the product gas B formed in reaction zone B, the target product is removed and the residual gas I remaining after an aftertreatment comprising a CO2 scrubbing and a partial discharge thereof is recycled into reaction zone A.
摘要:
A process for the long-term operation of a heterogeneously catalyzed gas phase partial oxidation of at least one organic compound over a catalyst bed, in which, in order to counteract the deactivation of the catalyst bed, the working pressure in the gas phase is increased during the operating time of the catalyst bed.
摘要:
A catalyst composition for use in manufacturing methacrolein by reacting with one of isobutene and t-butanol, the catalyst composition being represented by the formula of: x (Mo12Bi8FebCocAdBeOf)/y Z. Mo12BiaFebCocAdBeOf is an oxide compound. Z is a catalyst carrier is one of graphite, boron, silicon, germanium powder, and a mixture thereof Mo, Bi, Fe, Co, and O are chemical symbols of molybdenum, bismuth, iron, cobalt, and oxygen respectively. A is one of W, V, Ti, Zr, Nb, Ni, and Re. B is one of K, Rb, Cs, Sr, and Ba. The catalyst is adapted to not only enhance the production of methacrolein with high activeness and high selectivity but also effectively control the heat point of the catalyst during the methacrolein manufacturing process to prolong the catalyst life.
摘要翻译:一种用于通过与异丁烯和叔丁醇中的一种反应制备异丁烯醛的催化剂组合物,该催化剂组合物由下式表示:x(Mo 12 B 16 BrBeCeBeOf)/ y Z.Mo12BiaFebCocAdBeOf是一种氧化物。 Z是催化剂载体,分别是石墨,硼,硅,锗粉末及其混合物,Mo,Bi,Fe,Co和O分别是钼,铋,铁,钴和氧的化学符号。 A是W,V,Ti,Zr,Nb,Ni和Re中的一种。 B是K,Rb,Cs,Sr和Ba之一。 该催化剂不仅可以增强高活性和高选择性的甲基丙烯醛的生产,而且可有效控制甲基丙烯醛制造过程中催化剂的热点,延长催化剂的使用寿命。
摘要:
A method of producing short chain alcohols from glycerol generated as a byproduct of biodiesel production is provided utilizing separate dehydration and hydrogenation.