摘要:
A catalyst for producing dimethyl ether which comprises alumina particles having an average size of 200 μm or less and a methanol synthesis catalyst layer formed around the alumina particles. The methanol synthesis catalyst is in an amount of 0.05 to 5 parts by weight to 1 part by weight of the alumina particles. Dimethyl ether is produced by the method of forming a slurry by introducing the catalyst into a solvent and introducing a mixed gas comprising carbon monoxide and hydrogen into the slurry.
摘要:
A method for producing dimethyl ether by forming a slurry by introducing a catalyst into a solvent and introducing a mixed gas comprising carbon monoxide and hydrogen into the slurry. The catalyst comprises alumina particles having an average size of 200 .mu.m or less and a methanol synthesis catalyst layer formed around each of the alumina particles. The methanol synthesis catalyst has a weight ratio of 0.05 to 5 to a weight of the alumina particles. The catalyst is produced by forming a layer comprising a methanol synthesis catalyst around each of the alumina particles.
摘要:
In a method of producing dimethyl ether from a mixed gas containing carbon monoxide and either or both of hydrogen and water vapor or a mixed gas of them further containing carbon dioxide, the improvement which comprises using a mixed catalyst prepared by pulverizing a mixed catalyst containing at least zinc oxide, copper oxide or chrominum oxide, and aluminum oxide, compressing to bind them by a high pressure press and then pulverizing again or a mixed catalyst comprising at least zinc oxide, copper oxide and alumina, in a slurry state formed by suspending in a solvent. In the method of the invention, the yield of dimethyl ether is high, and the conversion water produced through reaction to hydrogen is high. There is no problem of clogging with catalyst, and mechanical strength is not required. Besides, the applicable range of the ratio of carbon monoxide and hydrogen is wide and the reaction is possible in the presence of carbon dioxide in a high concentration. Moreover, affects by impurities and catalyst poisons are small.
摘要:
An electric stripper comprising a pivotal arm carrying a cutter blade and pivoted to a rotary housing. The cutter blade is movable toward or away from the axis of rotation of the housing by the pivotal movement of the arm. The arm is pivotally movable by being biased by springs. When an interchangeable wheel is mounted on the housing, a pivotally moving portion of the arm slidingly moves relative to a biting amount adjusting portion of the wheel in engagement therewith to thereby pivotally move the arm against the biasing springs.
摘要:
A headed mandrel inserted through a rivet sleeve is pulled and snapped off its head by a riveter to deform the rivet sleeve for setting the rivet when a movable handlebar is pivotally moved relative to a fixed handlebar by hand. An operating bar pivotally supported by the main body of the riveter has one end pivoted to a chuck for gripping the mandrel and the other end serving as an engaging portion. A pusher is pivoted to the movable handlebar and has grooved portions engageable with the engaging portion. A bearing member pivoted to the main body is formed with bearing grooves positioned alongside the grooved portions in corresponding relation thereto and engageable with the engaging portion. When the movable handlebar is repeatedly turned, the pusher pushes the engaging portion in engagement with one grooved portion after another to engage the engaging portion correspondingly in one bearing groove after another and move the chuck by the resulting movement of the operating bar for setting the rivet.