Nippon Shokubai Co., Ltd.

Nippon Sholonbai Co., Ltd.

Hiromi Yunoki

Michio Tanimoto

Daisuke Nakamura

Tatsuya Kawajiri

Hiroyuki Hirota

Hideyuki Hironaka

Tsukasa Takahashi

Yukio Aoki

Masaaki Okuno

Naomasa Kimura

Takashi Sugimoto

Yasushi Kiyooka

Masatsugu Mikawa

Kazuyuki Uekawa

Hajime Gamma

Kenichi Ochiai

Tsuyoshi Kudoh

A nozzle includes: a flow path allowing gas to flow; tip opening portion(s) formed on a tip side of the flow path; a base end opening portion formed on a base end side of the flow path; and side hole(s) which is formed on the base end side from the tip opening portion and allows a part of the gas flowing through the flow path to be discharged toward the base end side. The tip opening portion(s) is formed in a direction of the flow path. The side hole(s) is formed along a circumferential direction of the flow path. When the gas is supplied from the base end opening portion, a ratio (Q1a/Q1b) of a flow rate (Q1a) of the gas discharged from the tip opening portion(s) and a flow rate (Q1b) of the gas discharged from the side hole(s) is 0.05 to 0.7.

Nozzle, solid matter unloading device, solid matter unloading system, and solid matter unloading method

A catalyst for the production of ethylene oxide in high efficiency and high selectivity, as well as stably for a long period of time is provided. A catalyst for the production of ethylene oxide comprising silver and a reaction promoter supported on a porous carrier comprising &#x3b1;-alumina as a main component, characterized in that a relative standard deviation of silver supporting rate of each particle of the catalyst is 0.001 or more and 0.1 or less.

Catalyst for production of ethylene oxide and method for production of ethylene oxide

An object of the present invention is to provide: a catalyst for production of acrylic acid which is a catalyst usable for production of acrylic acid and is excellent in the catalytic performances such as catalytic activity and in the physical properties such as physical strength of the catalyst itself; and a process for production of acrylic acid using this catalyst. As a means of achieving this object, a catalyst for production of acrylic acid according to the present invention is a catalyst obtained by drying a mixed liquid of starting materials including molybdenum and vanadium as essential components to give a dried material, molding the dried material with a liquid binder, and calcining the resultant molding, with the catalyst being characterized in that an ignition loss ratio of the dried material is from 5 to 40% by mass. A process for production of acrylic acid according to the present invention comprises the step of: subjecting acrolein to a catalytic gas phase oxidation in the presence of a molecular oxygen, with the process being characterized in that the above catalyst for production of acrylic acid according to the present invention is used.

Catalyst and process for production of acrylic acid

A catalyst that enables to produce ethylene oxide in a high selectivity and a method for the production of ethylene oxide using the catalyst are provided. In the catalyst for the production of ethylene oxide, wherein the catalyst component is supported by a carrier, a carrier containing &#x3b1;-alumina as the main component which has at least two peaks in the range of pore diameter of 0.01-100 &#x3bc;m and at least one peak of the above peaks is present in the range of pore diameter of 0.01-1.0 &#x3bc;m in the pore distribution measured by mercury porosimetry is adopted as said carrier.

The present invention provides: a production process for a catalyst for synthesis of an unsaturated aldehyde and/or an unsaturated carboxylic acid, which production process is suitable for producing the catalyst with good reproducibility, wherein the catalyst is excellent in activity, selectivity, and physical strength; this catalyst; and a production process for the unsaturated aldehyde and/or the unsaturated carboxylic acid by using this catalyst. The production process for the catalyst comprises the steps of: carrying out heat treatment of an aqueous solution or slurry of a starting material to thus prepare a catalyst precursor P1, wherein the starting material includes molybdenum, bismuth, and iron as essential components; thereafter adding and mixing a binder into the P1 to thus prepare a catalyst precursor P2; and molding and then calcining the P2, thereby producing the catalyst for synthesis of the unsaturated aldehyde and/or the unsaturated carboxylic acid; with the production process being characterized by involving an ignition loss ratio of the catalyst precursor P1 in the range of 10 to 40 mass % (excluding 40 mass %).

Catalyst for synthesis of unsaturated aldehyde, production process for said catalyst, and production process for unsaturated aldehyde using said catalyst

A catalyst for production of acrylic acid which catalyst is so high in activity as to give a still higher selectivity of acrylic acid or a long-catalytic-life-time catalyst for production of acrylic acid which catalyst is so high in activity as to be able to give a high acrylic acid yield while suppressing the temperature rise of the oxidation reaction to a low one; and processes for production of acrylic acid using these catalysts. The catalyst includes an oxide and/or a composite oxide as an essential catalytic component, wherein the oxide and/or the composite oxide has a metal element composition shown by general formula (1):MoVWCuO&#x2003;&#x2003;(1)(wherein: when a=12, then 1&#x2266;b&#x2266;14, 0&#x2266;c&#x2266;12, 0 &#x2266;d&#x2266;10, and 0&#x3c;c+d; and x is a numerical value determined by oxidation states of the elements);

Catalyst for production of acrylic acid and process for production of acrylic acid using the catalyst

There are provided a catalyst for catalytic gas phase oxidation of acrolein with molecular oxygen to produce acrylic acid, the catalyst including molybdenum and vanadium and further including at least one volatile catalyst poison ingredient in an amount of 10 to 100 ppb by mass as measured by ion chromatography; and a process for producing acrylic acid, including a step of carrying out catalytic gas phase oxidation of acrolein with molecular oxygen using the catalyst. The catalyst of the present invention can lower a hot spot temperature and suppress reduction in a reaction efficacy accompanied with thermal degradation, so that the acrolein conversion can stably be kept higher over a long term.

Catalyst for catalytic gas phase oxidation of acrolein and process for producing acrylic acid by catalytic gas phase oxidation using said catalyst

The object of the present invention is to provide a process in which, when the unsaturated carboxylic acid is produced, or when the unsaturated aldehyde and/or the unsaturated carboxylic acid are produced by carrying out the catalytic gas phase oxidation reaction by using the fixed-bed multitubular reactor which is packed with the molybdenum-containing catalyst, the reaction can be continued for a long time while a high yield is maintained, regardless of where the hot spot portion occurs and also even if the concentration of the raw gas is high. To solve this object, the present invention production process for an unsaturated carboxylic acid is characterized in: a particulate catalysts including, as catalytic components, an oxide and/or a complex oxide including Mo and V, or Mo, Fe and Bi as essential components, and having a hole are used; and a catalyst-packed layer of each reaction tube of the fixed-bed multitubular reactor is divided into at least two reaction zones in a tubular axial direction, wherein the packing of the catalysts is such that the diameters of the holes of the catalysts differ between at least two of the reaction zones.

Catalytic gas phase oxidation process

There are disclosed: a catalyst which can be used for production of acrylic acid and is excellent in the catalytic performances (e.g. conversion of starting material, selectivity of aimed product) and further has very high physical strength; and a process for production of acrylic acid using this catalyst. The above catalyst for production of acrylic acid is a catalyst which is obtained by a process including the steps of: heating a mixed liquid of starting materials including molybdenum and vanadium as essential components; and then molding the resultant dried material with a liquid binder; and then calcining the resultant molding; with the catalyst being characterized in that the liquid binder is an aqueous liquid of 7.0 to 10.0 in pH. The above process for production of acrylic acid is a process which comprises the step of carrying out catalytic gas phase oxidation of acrolein in the presence of molecular oxygen, thereby producing the acrylic acid; with the process being characterized by using the above catalyst for production of acrylic acid according to the present invention.

There is disclosed a production process for a catalyst which process makes it possible to efficiently carry out the supporting of a catalytic component onto a carrier and to obtain the catalyst excellent in quality and performance. This production process is a production process for the catalyst including a particulate lump carrier and a catalytic component supported thereon; with the production process comprising the step of carrying out simultaneous revolution and rocking of a treatment containeras charged with the carrier and a catalyst precursor including the catalytic component, thereby supporting the catalytic component onto the carrier.

Production process for catalyst

The present invention provides: a production process for a catalyst for synthesis of an unsaturated aldehyde and/or an unsaturated carboxylic acid, which production process is suitable for producing the catalyst with good reproducibility, wherein the catalyst is excellent in activity, selectivity, and physical strength; this catalyst; and a production process for the unsaturated aldehyde and/or the unsaturated carboxylic acid by using this catalyst. The production process for the catalyst comprises the steps of: carrying out heat treatment of an aqueous solution or slurry of a starting material to thus prepare a catalyst precursor P, wherein the starting material includes molybdenum, bismuth, and iron as essential components; thereafter adding and mixing a binder into the Pto thus prepare a catalyst precursor P; and molding and then calcining the P, thereby producing the catalyst for synthesis of the unsaturated aldehyde and/or the unsaturated carboxylic acid; with the production process being characterized by involving an ignition loss ratio of the catalyst precursor Pin the range of 10 to 40 mass % (excluding 40 mass %).

The present invention provides a process in which, when an unsaturated aldehyde and/or an unsaturated carboxylic acid are produced by carrying out a catalytic gas phase oxidation reaction by using a fixed-bed multitubular reactor which is packed with a molybdenum-containing catalyst, the deterioration of the catalyst as located at a hot spot portion can be suppressed; so that the reaction can be continued for a long time while a high yield is maintained, regardless of where the hot spot portion occurs and also even if the concentration of a raw gas is high. An oxide and/or a complex oxide including molybdenum, bismuth, and iron as essential components are used as the catalysts, and the inside of each reaction tube of the fixed-bed multitubular reactor is divided in a tubular axial direction to thus arrange at least two reaction zones, and then these reaction zones are packed with the catalysts in such a manner that the ratio R of the apparent density of the catalyst to the true density of the catalyst (apparent density of catalyst/true density of catalyst) in each reaction zone differs from that in another reaction zone.

Production process for unsaturated aldehyde

The present invention provides a process for producing acrylic acid, by which process the problem, such that the catalyst placed on the gas inlet side deteriorates faster than that placed on the gas outlet side, is solved, so that the catalyst can be used stably for a long time. The process for producing acrylic acid, according to the present invention, comprises the step of carrying out catalytic gas phase oxidation with a fixed-bed shell-and-tube reactor as packed with a catalyst, wherein: used as the catalyst is an oxide shown by the following general formula (1): MOVABCO(1) (wherein: A shows at least one member selected from the group consisting of niobium and tungsten; B shows at least one member selected from the group consisting of chromium, manganese, iron, cobalt, nickel, copper, zinc, and bismuth; C shows at least one member selected from the group consisting of phosphorus, tin, antimony, and tellurium); and at least two reaction zones as provided by dividing the inside of each reaction tube in a direction of an axis of the tube in the reactor are packed with the catalyst such that there are regulated the kind and/or amount of the A component and/or the kind and/or amount of the B component.

Process for producing acrylic acid

A modified carrier carrying on at least a part of an inert carrier surface an oxide which is represented by the formula (1): X Y Z O (wherein X is at least an element selected from alkaline earth metals; Y is at least an element selected from Si, Al, Ti and Zr; Z is at least an element selected from Group IA elements and Group IIIb elements of the periodic table, B, Fe, Bi, Co, Ni and Mn; and O is oxygen; a, b, c and d denote the atomic ratios of X, Y, Z and O, respectively, where a&equals;1, 0<b&lE;100, 0&lE;c&lE;10, and d is a numerical value determined by the extents of oxidation of the other elements) is provided. A catalyst formed with the use of this modified carrier carrying a complex oxide containing Mo and V is useful as a vapor-phase catalytic oxidation catalyst, and is particularly suitable as a catalyst for preparing acrylic acid through vapor phase catalytic oxidation of acrolein.

Modified carrier, complex oxide catalyst and process for preparation of acrylic acid

The present invention provides: a process which involves safely and sanitarily extracting a solid material from a shell-and-tube reactor with good efficiency. The process comprises the step of extracting a solid material that is packed in a reaction tube of a shell-and-tube reactor with the process further comprising: the step (a) of inserting an aspirating tube from an end of the reaction tube wherein the aspirating tube is connected to an exhaust gas aspirator and the step (b) of extracting the solid material from the reaction tube by aspirating the solid material in the reaction tube from a tip of the aspirating tube together with a stream of air.

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Himeji, Japan

Hiromi Yunoki