摘要:
A process for producing aromatic hydrocarbons in a high yield by introducing a naphtha fraction the cyclopentane content of which is controlled to not more than 1% by weight, or the methylpentane content is controlled to not more than 10% by weight, in a catalytic reaction tower, and contacting with a catalyst comprising a large pore zeolite containing at least one of Group VII metals of the Periodic Table. In this process, the catalyst cycle is greatly lengthened.
摘要:
A catalyst for production of aromatic hydrocarbons and a process for producing aromatic hydrocarbons from various hydrocarbons using said catalyst are disclosed. The catalyst comprises a L-type zeolite treated with a halogen-containing compound and platinum deposited thereon, which is of high activity and then has a long service life. The process of the present invention using the catalyst enables to produce aromatic hydrocarbons in a yield as high as not less than 80% for a long time. The hydrocarbon feedstock is selected from paraffin, olefin, acetylene, cyclic paraffin, and cyclic olefin-based hydrocarbons.
摘要:
A process for producing aromatic hydrocarbons which comprises contacting at least one type of hydrocarbon selected from paraffin, olefin, acetylene, cyclic paraffin and cyclic olefin-based hydrocarbons with a catalyst comprising a L-type zeolite treated with a halogen-containing compound and platinum deposited thereon.
摘要:
An optical processing apparatus that is capable of detecting accurately the sticking status of deposits sticking to optical means in a background of same color as deposits, preventing occurrence of defective soldering due to feeding failure of wire solder, and detecting solder failure when the leading end portion of the wire solder does not reach up to the processing area. This optical processing apparatus comprises light energy output means for producing light energy, a first optical path for guiding the light energy into a work, optical means disposed in the first optical path for shaping the light energy, a second optical path sharing part of the first optical path for guiding the light from the work to photo receiving means, and driving means for changing the relative positions of at least the optical means and the work.
摘要:
The invention presents a optical processing apparatus capable of detecting accurately the sticking status of deposits sticking to optical means in a background of same color as deposits, preventing occurrence of defective soldering due to feeding failure of wire solder, and detecting solder failure when the leading end portion of the wire solder does not reach up to the processing area. This optical processing apparatus comprises light energy output means for producing light energy, a first optical path for guiding the light energy into a work, optical means disposed in the first optical path for shaping the light energy, a second optical path sharing part of the first optical path for guiding the light from the work to photo receiving means, and driving means for changing the relative positions of at least the optical means and the work.
摘要:
The invention presents a optical processing apparatus capable of detecting accurately the sticking status of deposits sticking to optical means in a background of same color as deposits, preventing occurrence of defective soldering due to feeding failure of wire solder, and detecting solder failure when the leading end portion of the wire solder does not reach up to the processing area. This optical processing apparatus comprises light energy output means for producing light energy, a first optical path for guiding the light energy into a work, optical means disposed in the first optical path for shaping the light energy, a second optical path sharing part of the first optical path for guiding the light from the work to photo receiving means, and driving means for changing the relative positions of at least the optical means and the work.
摘要:
The present invention provides a fluorinated polymer excellent in the crosslinking reactivity, crosslinked rubber physical properties and chemical resistance, and its crosslinked rubber. A fluorinated polymer comprising repeating units (a) based on at least one monomer selected from the group consisting of ethylenic unsaturated compounds each having a hydroxyphenyl group, repeating units (b) based on at least one fluoromonomer selected from the group consisting of tetrafluoroethylene, hexafluoropropylene, vinylidene fluoride, 3,3,3-trifluoropropene, 1,3,3,3-tetrafluoropropene, 1,1,2-trifluoroethylene, vinyl fluoride, 1,2-difluoroethylene and CF2═CF—O—Rf (wherein Rf is a C1-8 saturated perfluoroalkyl group or a perfluoro(alkoxyalkyl) group) and, if necessary, repeating units (c) based on at least one hydrocarbon monomer selected from the group consisting of ethylene, propylene and CH2═CH—O—R1.
摘要:
An optical processing apparatus includes an emitter for emitting light, a first light path for directing the light to a position to be processed on a workpiece, and a processing head. The processing head includes an optical system provided in the first light path, for shaping the light, a second light path having a portion shared with the first light path, the second light path directing light reflected from the workpiece, and an optical receiver for receiving the reflected light from the second light path. The optical processing apparatus further includes an actuator for changing a positional relationship between the optical system and the workpiece, a feeder for supplying a solder to the workpiece, a first shifter for moving the processing head in a first direction in parallel to an optical axis of the light emitted from the emitter, a second shifter for positioning the feeder in the first direction away from the processing head when the processing head is moved away from the workpiece by the first shifter, and a third shifter for moving the feeder against the processing head in a second direction perpendicular to the first direction while the processing head is moved by the first shifter. The optical processing apparatus allows the spot of the incident light and the position of soldering to be readily set depending on the configuration of a workpiece and can thus solder the workpiece at higher quality under soldering conditions optimized for the workpiece.