摘要:
A process for producing quinones corresponding to anthracenes or alkylnaphthalenes in high yields and selectivities, which comprises reacting the anthracenes or alkylnaphthalenes with hydrogen peroxide in the liquid phase in the presence of hydrogen chloride as a catalyst. Methanol, for example, may be used as a reaction medium.
摘要:
A method for producing a high concentration of hydrogen peroxide by reacting oxygen and hydrogen directly in a neutral reaction medium that contains a promoter comprising a halogen containing compound, which halogen containing compound contains at least one halogen other than fluorine, at a reaction temperature in the range of from 0.degree. to 50.degree. C. and at a reaction pressure in the range of from 3 to 150 kg/cm.sup.2 .multidot.G in the presence of a platinum group metal catalyst supported on a catalyst carrier containing a heteropolyacid that has been made insoluble in water or a platinum group metal catalyst supported on a catalyst carrier comprising activated carbon that is supporting a heteropolyacid.
摘要翻译:在含有含卤素化合物的促进剂的中性反应介质中直接使氧和氢反应生成高浓度的过氧化氢的方法,所述助催化剂包含含卤素的化合物,该含卤化合物含有至少一种氟以外的卤素, 在负载在含有不溶于水的杂多酸的催化剂载体上的铂族金属催化剂存在下,在0至50℃的范围内和在3至150kg / cm 2 G的范围内的反应压力 或负载在包含负载杂多酸的活性炭的催化剂载体上的铂族金属催化剂。
摘要:
A method for producing hydrogen peroxide by the reaction of hydrogen and oxygen in the reaction medium in the presence of a platinum group metal catalyst supported on a halogenated resin, in which, since there are no halogen ion nor high concentrations of acid in the reaction medium of this invention as there are in prior art methods, the problems of dissolution of catalyst and corrosion of the reaction vessel are solved.
摘要:
Recessed portions extending in the direction of the cam shaft from the opposed edges of the intake cam and the exhaust cam are respectively formed on the base circles of the intake cam and the exhaust cam of the cam shaft. Moreover, projecting ribs crossing a predetermined circumference of the cam shaft, having rib end portions directed toward the recessed portions, and extending in the rotational direction of the cam shaft, are radially projectingly provided on the cam shaft adjacent to the recessed portions.
摘要:
This invention provides a process for producing hydrogen peroxide through catalytic reaction of oxygen with hydrogen in an aqueous medium in the presence of a platinum group metal catalyst, in which an organic solvent having only limited solubility with water and less hydrogen peroxide-dissolving ability compared to that of water is caused to be concurrently present in the reactor, and oxygen and hydrogen are catalytically reacted in an aqueous medium in the presence of a water- and organic solvent-insoluble, hydrophilic platinum group metal catalyst, under a low reaction pressure, to form high concentration aqueous hydrogen peroxide solution within a short time.
摘要:
A push rod includes a rod body and a steel ball bonded to at least one of end faces of the rod body by an electric resistance welding. The rod body 2 is formed from an aluminum alloy. Thus, it is possible to provide a push rod which is lightweight and which can be produced at an inexpensive cost.
摘要:
An intake cam and an exhaust cam are formed integrally with a cam shaft, and a decompression cam is additionally provided adjacently to the front side of the exhaust cam. A rib is formed in back of the intake cam. A cylindrical surface portion having a diameter being the same as that of the outer periphery surface of a ball bearing for supporting the front portion of the cam shaft and being larger than the diameter of the base circle of the cam shaft, is formed on the front crank case, and a locking stepped portion is formed in back of the cylindrical surface portion. Cutout portions are formed in the locking stepped portion so that the cam shaft can be pulled forward in the state that the intake cam, exhaust cam and the decompression cam are arranged.
摘要:
A power unit for a vehicle constructed by combining an internal combustion engine and a transmission integrally is provided. A crankshaft rotatably supported in front and rear crankcases of the internal combustion engine is positioned biased slightly toward right side from the center of the crankcases, a cylinder block and a cylinder head is inclined toward the left so as to extend obliquely leftward and upward from the crankshaft, on the left side of the crankshaft are arranged a main shaft and an auxiliary shaft of the transmission in turn, at a middle and upper portion between the main and auxiliary shafts a reverse shaft, and below the auxiliary shaft a driving shaft. On the right side of the crankshaft is arranged a cam shaft. These shafts are parallel with each other and directed in the vehicle running direction.
摘要:
The present invention provides a process for producing hydrogen peroxide by reacting oxygen and hydrogen in a reaction medium catalytically using, as a catalyst, a tin-modified platinum group metal supported on a carrier. In the process using said catalyst, the presence of halogen and acid in reaction medium is unnecessary unlike the prior art methods, and hydrogen peroxide of high concentration can be produced efficiently. Thus, the present process has no restriction for reactor material as seen the prior art methods and further allows for easy purification of produced hydrogen peroxide.
摘要:
This invention provides a method for high efficiency, high concentration production of hydrogen peroxide wherein oxygen and hydrogen are reacted in the reaction medium in the presence of a catalyst comprising a metallic or carrier supported platinum group metal catalyst onto which an organic halogen compound which is insoluble in water, which compound excludes compounds which contain no halogen other than fluorine, has been adsorbed or a platinum group metal catalyst supported on a carrier in which a halogenated organic compound, which compound excludes compounds that contain no halogen other than fluorine, has been adsorbed to the carrier prior to supporting the platinum group metal. Since it is not necessary for halogen ions to be present in the reaction medium as it was in the prior art, the problems of deterioration due to the dissolution of the catalyst and of corrosion of the structural materials of the reaction vessel are alleviated.