摘要:
A molded iron catalyst material which has an indentation hardness of from 850 to 1500 kp/cm.sup.2 and contains metallic iron particles, obtained from iron oxide particles by contact with hydrogen at less than 500.degree. C., and a lubricant, its preparation and its use.
摘要翻译:一种模压铁催化剂材料,其压痕硬度为850至1500kp / cm 2,并含有通过在低于500℃与氢接触的氧化铁颗粒获得的金属铁颗粒,以及润滑剂及其制备及其用途 。
摘要:
A continuous method for producing a lightweight sandwich panel comprises providing a scattered layer of glue-coated woodchips; pressing this layer and bonding the wood chips under pressure and temperature conditions such that a high vapor pressure is built up in the center between the cover layers; relieving the pressure by moving the pressing surfaces away from one another, whereby the chipboard tears open in the center due to the built-up vapor pressure and divides into two cover layers of equal thickness; moving the cover layers apart; introducing a foam system that can be foamed and cured to form a hard foam between the cover layers; bringing the cover layers together to the nominal thickness of the lightweight sandwich panel to be produced and holding the pressure until the intermediate layer has finished reacting; and finishing the lightweight sandwich panel.
摘要:
Caprolactam is prepared in a process comprising(a) a Beckmann rearrangement of cyclohexanone oxime with oleum at from 70.degree. to 130.degree. C. in one or more rearrangement stages, and(b) aftertreatment of the reaction mixture obtained from the rearrangement stage in a delay zone at from 70.degree. to 110.degree. C. for from 10 to 600 minutes.
摘要:
Saturated primary amines are prepared by reacting a nitrile with hydrogen at elevated temperature under superatmospheric pressure in the presence of ammonia and a metallic iron catalyst which has been obtained by reducing anisometric iron oxide particles with hydrogen at not more than 500.degree. C.
摘要:
Molded iron catalysts which contain metallic iron particles, obtained from anisometric iron oxide particles by contact with hydrogen at .ltoreq.500.degree. C., and a lubricant, are prepared.
摘要:
The invention relates to: A) a continuous method for producing a lightweight sandwich panel having an upper and a lower cover layer made of pressed wood chips glued to one another, as well as an intermediate hard foam layer which is thick in relation to a cover layer, arranged between the cover layers and fixedly connected thereto, the method comprising the following steps: 1) providing a scattered layer of glue-coated woodchips; 2) pressing this layer and bonding the wood chips under pressure and temperature conditions typical of conventional chipboard production such that a high vapour pressure is built up in the centre between the cover layers; 3) relieving the pressure on the chipboard by moving the pressing surfaces away from one another, whereby the chipboard tears open in the centre due to the built-up vapour pressure and divides into two cover layers of equal thickness; 4) moving the cover layers apart such that an intermediate layer can be inserted; 5) introducing a hard foam system that can be foamed and cured to form a hard foam between the cover layers; 6) bringing the cover layers together to the nominal thickness of the lightweight sandwich panel to be produced and holding the pressure until the intermediate layer has finished reacting; and 7) finishing the lightweight sandwich panel. B) The invention further relates to a lightweight sandwich panel producible according to the method described in A), with a transition zone created by the uneven portions of the cover layers on the inner side, which are filled with the polyurethane hard foam.
摘要:
The preparation of cyclohexene oxide, cyclohexanol and cyclohexanone involvesa) oxidizing cyclohexane using a gas containing molecular oxygen to form cyclohexyl hydroperoxide, cyclohexanol and cyclohexanone,b) jointly separating the mixture from a) and c) by distillation, andc) reaction of the cyclohexyl hydroperoxide fraction from b) with cyclohexene in the presence of a transition-metal compound from group 4 to 6, forming cyclohexene oxide, and separating the product mixture in b).
摘要:
5-Membered, 6-membered or 7-membered cyclic imines are prepared by hydrogenating a C.sub.2 -C.sub.4 -alkanedinitrile in the liquid phase, at from 180.degree. to 300.degree. C. and under superatmospheric pressure, in the presence of a catalyst, by a process in which an iron catalyst obtained by reduction of an iron oxide with hydrogen at .ltoreq.500.degree. C. is used.
摘要:
Molded catalyst materials contain metallic cobalt and/or nickel particles and a lubricant, the said particles being obtained by reduction of cobalt oxide and/or nickel oxide particles containing less than 0.1% by weight of alkali metal oxides and/or alkaline earth metal oxides at .ltoreq.500.degree. C., and the molded catalyst material having an indentation hardness greater than 300 kp/cm.sup.2.