摘要:
A process for producing aromatic hydrocarbons and hydrogen, in which a lower hydrocarbons-containing feedstock gas is reformed by being supplied to and being brought into contact with a catalyst under high temperature conditions thereby forming aromatic hydrocarbons and hydrogen. The method includes the steps of (a) supplying a hydrogen gas together with the feedstock gas during a supply of the feedstock gas; and (b) suspending the supply of the feedstock gas for a certain period of time while keeping a condition of a supply of the hydrogen gas. The catalyst is exemplified by a metallo-silicate carrying molybdenum and a metallo-silicate carrying molybdenum and rhodium. An amount of the hydrogen gas supplied together with the feedstock gas is set to be preferably larger than 2% and smaller than 10%, more preferably within a range of from 4 to 8%, much more preferably 8%. As a pretreatment for a reforming reaction by which aromatic hydrocarbons and hydrogen are formed, the catalyst is increased in temperature and kept at the temperature for a certain period of time while a gas containing methane and hydrogen is supplied thereto.
摘要:
An aromatic compound, particularly benzene, is stably produced in the presence of a catalyst from a lower hydrocarbon having 2 or more carbon atoms, particularly from an ethane-containing gas composition such as ethane gas and natural gas. Disclosed is a process for producing an aromatic compound by reacting ethane or an ethane-containing raw gas in the presence of a catalyst. The catalyst may comprise molybdenum carried on metallosilicate such as H-type ZSM-5H or H-type MCM-22. In the reaction, the temperature is from 550 to 750° C., preferably not lower than 600° C. and not higher than 680° C. Additionally, the raw gas further contains methane and hydrogen is added thereto, thereby improving the production efficiency and stability.
摘要:
An aromatic compound, particularly benzene, is stably produced in the presence of a catalyst from a lower hydrocarbon having 2 or more carbon atoms, particularly from an ethane-containing gas composition such as ethane gas and natural gas. Disclosed is a process for producing an aromatic compound by reacting ethane or an ethane-containing raw gas in the presence of a catalyst. The catalyst may comprise molybdenum carried on metallosilicate such as H-type ZSM-5H or H-type MCM-22. In the reaction, the temperature is from 550 to 750° C., preferably not lower than 600° C. and not higher than 680° C. Additionally, the raw gas further contains methane and hydrogen is added thereto, thereby improving the production efficiency and stability.
摘要:
A process for producing aromatic hydrocarbons and hydrogen, in which a lower hydrocarbons-containing feedstock gas is reformed by being supplied to and being brought into contact with a catalyst under high temperature conditions thereby forming aromatic hydrocarbons and hydrogen. The method includes the steps of (a) supplying a hydrogen gas together with the feedstock gas during a supply of the feedstock gas; and (b) suspending the supply of the feedstock gas for a certain period of time while keeping a condition of a supply of the hydrogen gas. The catalyst is exemplified by a metallo-silicate carrying molybdenum and a metallo-silicate carrying molybdenum and rhodium. An amount of the hydrogen gas supplied together with the feedstock gas is set to be preferably larger than 2% and smaller than 10%, more preferably within a range of from 4 to 8%, much more preferably 8%. As a pretreatment for a reforming reaction by which aromatic hydrocarbons and hydrogen are formed, the catalyst is increased in temperature and kept at the temperature for a certain period of time while a gas containing methane and hydrogen is supplied thereto.
摘要:
A catalyst for producing aromatic compounds from lower hydrocarbons while improving activity life stability of methane conversion rate; benzene formation rate; naphthalene formation rate; and total formation rate of benzene, toluene and xylene is formed by loading molybdenum and copper on metallo-silicate serving as a substrate and then calcining the metallo-silicate. When the catalyst is reacted with a reaction gas containing lower hydrocarbons and carbonic acid gas, aromatic compounds are produced. In order to obtain the catalyst, it is preferable that molybdenum and copper are loaded on zeolite formed of metallo-silicate after the zeolite is treated with a silane compound larger than a pore of the zeolite in diameter and having an amino group and a straight-chain hydrocarbon group, the amino group being able to selectively react with the zeolite at a Bronsted acid point of the zeolite. It is preferable that a loaded amount of molybdenum is within a range of from 2 to 12 wt. % based on total amount of the calcined catalyst while copper is loaded at a copper to molybdenum molar ratio of 0.01 to 0.8.
摘要:
[Object] To produce aromatic hydrocarbon stably for a long time maintaining a high aromatic hydrocarbon yield when the aromatic hydrocarbon is produced upon making a contact reaction between lower hydrocarbon and a catalyst.[Solving Means] In a method of producing aromatic hydrocarbon, including repeating a reaction step for obtaining aromatic hydrocarbon upon making a contact reaction between lower hydrocarbon and a catalyst and a regeneration step for regenerating the catalyst used in the reaction step, carbon dioxide in an amount of 0.33 to 1.6% by volume relative to an amount of the lower hydrocarbon is added to the lower hydrocarbon, in the reaction step.
摘要:
To economically regenerate a catalyst and to produce aromatic hydrocarbon stably for a long time maintaining a high aromatic hydrocarbon yield when the aromatic hydrocarbon is produced upon making a contact reaction between lower hydrocarbon and the catalyst.A method of producing aromatic hydrocarbon and an apparatus for producing aromatic hydrocarbon by repeating a reaction step for obtaining aromatic hydrocarbon upon making a contact reaction between lower hydrocarbon and a catalyst and a regeneration step for regenerating the catalyst used in the reaction step. Off-gas which is gas obtained by removing aromatic hydrocarbon produced in the reaction step from discharge gas passing through the reaction step is used as a regeneration gas in the regeneration step.
摘要:
A structure of mounting a shield cover according to the present invention includes a shield cover having an insertion part which is inserted into a gap formed between a circuit substrate and a shield cover fastening part along the circuit substrate. The insertion part of the shield cover includes a convex part that is elastic and deformable, and the end of the insertion part and the shield cover fastening part come in contact with each other by the elasticity with the convex part being in contact with the circuit substrate as the fulcrum.
摘要:
An automatic analyzer including a light source device. The light source device includes a plurality of light sources that emit respective lights of different peak wavelengths, in which a wavelength range of one of the light emitted contains the peak wavelength of the other light emitted from the other light source; and a mixing unit that mixes the respective lights emitted from the light sources. The light source device outputs a light having a desired mixed peak wavelength that is different from the peak wavelengths.
摘要:
To provide a high quality SAW device with enhanced productivity, wherein an outer face of a SAW chip mounted on a mounting substrate is covered with a heat-softened resin sheet and resin is filled on the SAW chip to form an airtight space below an IDT in the SAW device. A method for manufacturing the SAW device includes: a step of flip-chip mounting the SAW chip on the mounting substrate, a step of placing the resin sheet on an upper face of the SAW chip; a laminating step of setting ambient environment to pressure-reduced or vacuum atmosphere and covering the outer face of the SAW chip with resin while securing the airtight space by pressurizing the resin sheet while heating the resin sheet; a press forming step of curing the resin while maintaining the airtight space by maintaining pressurized and heated state in the laminating step; and a post-curing step of performing heating at a temperature and for a time in which the resin completely cures, wherein a thickness tr of the resin sheet before the laminating step satisfies an equation of L/{(X+Gx)(Y+Gy)}≦tr.