摘要:
A process for producing isobutylene and methanol comprising: a first step of subjecting methyl-tert-butyl ether to decomposition in the presence of a catalyst to obtain a reaction liquid; a second step of washing the resultant with water to separate the reaction liquid into an oil layer and an aqueous layer; a third step of subjecting the oil layer to distillation to obtain a fraction containing isobutylene and a dialkyl ether from the top of a distillation column, a fraction containing methyl-tert-butyl ether and the heavy components from the bottom of the column and a fraction containing methyl-tert-butyl ether from a side cut of the column, and recycling the side cut fraction to the first step; and a fourth step of subjecting the aqueous layer to distillation to obtain a fraction containing methanol from the top of a distillation column and a fraction containing water from the bottom of the column.
摘要:
The object of the present invention is to provide a novel gas separation membrane having a high gas permeability and a high gas selectivity, and a method of producing the same. The present invention provides a gas separation membrane comprising a polymeric material soluble in an organic solvent, wherein at least a part of the surface is modified by ion bombardment.
摘要:
The invention provides a method for producing a liquid discharge head including a head main body provided with plural energy generation elements for generating energy for discharging liquid as a flying liquid droplet and plural flow paths in which the energy generation elements are respectively provided, and an orifice plate provided with plural discharge ports respectively communicating with the flow paths, wherein the orifice plate and the head main body are mutually adjoined, the method comprising a step of preparing a substrate consisting of a silicon-containing material for preparing the orifice plate a step of forming, by dry etching, plural recesses in positions on the surface of the substrate respectively corresponding to the discharge ports, with a depth larger by 5 to 50 &mgr;m than the depth of the discharge ports, a step of thinning the substrate from the reverse side thereof until the depth of the recesses becomes equal to the depth of the discharge apertures to form plural discharge ports on the substrate, thereby preparing the orifice plate constructed by forming the plural discharge ports in the substrate, and a step of adjoining the orifice plate to the head main body.
摘要:
To provide a reading/printing apparatus and a reading apparatus by which the facility with which each unit is assembled and maintained can be significantly improved because steps of fixing and connecting individual units need not be performed in order, a printing apparatus, a control board, and a power supply are disposed inside a housing obtained by integrally forming a base portion serving as a bottom surface, side walls serving as outer side surfaces, and an opening surrounded by the side walls. The reading apparatus, the printing apparatus, the control board, and the power supply are discretely constituted. The housing includes a first housing integrally formed with enough strength to separately fix the base portion, lower portions of the side walls, the reading apparatus, the printing apparatus, the control board, and the power supply, and a second housing covering the opening and integrally forming upper portions of the side walls. The second housing is fixed to the first housing by elastic deformation so as to cover the opening of the first housing.
摘要:
A display device is constituted by a pair of substrates at least one of which is provided with a display electrode. The display electrode comprises an electroconductive transparent film comprising indium oxide and/or tin oxide and having a surface unevenness of at most 30 Å. The transparent film may preferably be an ITO film containing an amorphous component. The transparent film is effective in improving a surface flatness allowing a good alignment control performance while retaining a good transmittance and a low sheet resistance and is readily etched with weak acid to suppress peeling of an underlying layer thereof and an occurrence of microcracks therein.
摘要:
Recording pulses are each provided in a train of divided pulses, one of which has a greater pulse width than the other divided pulse. Laser light power emitted by a laser diode is detected at predetermined timing corresponding to the greater-width divided pulse, and an electric current for driving the laser diode is controlled in such a manner that the detected laser light power appropriately follows a predetermined laser power value. Thus, in the case where the recording pulses are each provided in a train of divided pulses, this arrangement can accurately detect the laser light power and thereby achieves high-precision control of the laser light power.
摘要:
Means are provided for effectively restricting or preventing occurrence of abnormal noise under cold ambient. The means are durable, cost effective and also keep the function of a pulley. A ball bearing 2 of a single row type includes an outer ring 2a and balls 2c. The outer ring 2a and each ball 2c are contacted with each other at two points. An oil groove 5 is formed at a position adjacent to the contact positions P and Q on the raceway surface between the raceway surface 3a of the outer ring and the balls 2c. The ball bearing 2 is fitted within or made integral with the inner diameter of a pulley body 1 having a peripheral surface 1e to be contacted with a belt.
摘要:
A pulley, ball bearing and fan comprising each of the pulley and ball bearing for effectively restricting or preventing occurrence of abnormal noise under cold ambient conditions. A ball bearing 2 of a single row type includes an outer ring 2a and balls 2c. The outer ring 2a and each ball 2c are contacted with each other at two points. An oil groove 5 is formed at a position adjacent to the contact positions P and Q on the raceway surface between the raceway surface 3a of the outer ring and the balls 2c. The ball bearing 2 is fitted within or made integral with the inner diameter of a pulley body 1 having a peripheral surface 1e to be contacted with a belt.
摘要:
A plug-jack connecting structure is provided which includes a jack having a sleeve at a forward end of the jack. The sleeve has a non-circular outside shape and has grooves cut in an outer periphery thereof. A plug has a ring rotatably mounted thereon at one end thereof for receiving the sleeve. The ring has a sleeve receiving hole which has a shape complementary to the outside shape of the sleeve. By turning the ring through a 90 degree angle into engagement with the grooves, the jack and the plug are connected in a state in which they are prevented from being disengaged.