摘要:
Improved processes for producing an ε-caprolactam using a solid catalyst and for producing a catalyst which can be used in the production of ε-caprolactam are provided. In the present invention, a solid catalyst such as a zeolite is treated with an aqueous solution containing an ammonia and at least one compound selected from the group consisting of quaternary ammonium compounds and lower alkylamines. In accordance with the present invention, a zeolite having a high catalyst activity and a long lifetime is produced, and a solid catalyst which has been used in the production of ε-caprolactam can be re-activated. In the present invention, by using the thus obtained zeolite and/or the thus activated solid catalyst, an ε-caprolactam is produced in a high yield over the long period of time.
摘要:
A process for producing a pentacyl-type crystalline zeolite is provided which comprises the steps of (i) preparing a mixture of a silicon compound, water and tetrapropyl ammonium hydroxide, (ii) conducting a hydrothermal reaction of the mixture to obtain a reaction mixture containing zeolite crystals, (iii) separating zeolite crystals from the reaction mixture to collect a remaining solution, (iv) calcinating the resulting zeolite crystals, (v) treating the calcinated zeolite crystals with a solution such as ammonia water and (vi) recycling the solution collected in step (iii) to step (i), wherein in the mixture prepared in step (i) a molar ratio of hydroxide ion to silicon is from about 0.1 to about 0.4 and a molar ratio of potassium to silicon is about 0.1 or less. With this process, a zeolite catalyst having good performance can be produced with good reproducibility.
摘要:
A method is provided for producing &egr;-caprolactam from cyclohexanone oxime by using a zeolite or non-zeolitic material as a catalyst under gas phase reaction conditions. The method comprises a reaction step converting cyclohexanone oxime into &egr;-caprolactam in the presence of the zeolite or non-zeolitic material; and a regeneration step of treating the zeolite or non-zeolitic material with a non-oxidizing gas at a temperature of from about 100°C. to about 600° C.
摘要:
A method for producing cycloolefins useful as an intermediate material for lysine, caprolactam, adipic acid, medicines, agricultural chemicals, dyes and the like, which comprises partial hydrogenation of aromatic hydrocarbons with hydrogen gas in the presence of a catalyst composed of barium sulfate which is a carrier as well as ruthenium and at least one metal selected from the group consisting of iron, cobalt, silver and copper supported on said barium sulfate, and water.
摘要:
A catalytic process for the preparation of acrolein by the vapor phase oxidation of propylene which comprises contacting propylene and oxygen with a catalyst composition comprising a catalyst system of the formula:Mo.sub.a Bi.sub.b Fe.sub.c X.sub.d Ni.sub.e Tl.sub.f P.sub.g O.sub.hwherein X is one or more of Mg, Mn and Co and a, b, c, d, e, f, g and h represent, respectively, the number of atoms wherein a is 12, b is 0.1 to 5, c is 0.1 to 5, d is 0 to 12, e is 0.1 to 12, f is 1 or less but not 0, g is 0 to 5 and h depends on the number of the other atoms and is usually from 36 to 89. Acrolein is produced with the use of said catalyst in a high selectivity and an excellent yield per each pass even at a large space velocity.
摘要:
In the production of .epsilon.-caprolactam from cyclohexanon oxime in gaseous phase in the presence of solid catalysts, the catalysts, no matter whether they may have worked, are brought into contact with either aqueous solution of ammonium salts and at least one basic material or ammonia water.
摘要:
A method for treating ammonia-containing gases for removing ammonia therefrom, which comprises contacting the ammonia-containing gases with a metal oxide catalyst having the following formula:Cr.sub.x A.sub.y O.sub.zwherein Cr is chromium; A is at least one element selected from the group consisting of tin, antimony, vanadium, cobalt, silver, zinc, nickel, titanium, molybdenum, tungsten, sulfur, phosphorus, boron, germanium and zirconium; x is a numeral of 4 to 12; y is a numeral of 0.2 to 8 and z is a numeral of 6.2 to 42, in a vapor phase at a temperature of from 200.degree. to 500.degree. C in the presence of molecular oxygen, and thereby the ammonia is oxidized to harmless nitrogen gas.
摘要:
In the production of .epsilon.-caprolactam from cyclohexanon oxime in gaseous phase in the presence of solid catalysts, the catalysts, no matter whether they may have worked, are brought into contact with either aqueous solution of ammonium salts and at least one basic material or ammonia water.
摘要:
Carbonaceous materials deposited on solid catalysts and produced, for example, in Beckmann rearrangement in a gaseous phase are burned off by effecting the treatment in the presence of alcohols such as methanol or ethanol together with molecular oxygen-containing gas in order to regenerate the catalyst activity.
摘要:
A heteropoly-acid of the formula:H.sub.3+x (PMo.sub.12-x V.sub.x O.sub.40).nH.sub.2 Owherein x and n are numbers satisfying respectively the equations: 0.ltoreq.x.ltoreq.3 and n.ltoreq.6, and comprising phosphorus as the central atom and molybdenum or molybdenum and vanadium as the coordinating atoms, or its reduction-form product, which is in a cubic crystal structure having diffraction lines at lattice spacings (d) of at least 8.4, 6.8, 5.9, 4.8, 4.2 and 3.4 in the X-ray powder diffraction. The heteropoly-acid is useful as a catalyst, especially as a catalyst in the production of methacrylic acid by the gas-phase catalytic oxidation of methacrolein.