摘要:
A process for the preparation of a supported catalyst for the polymerization of .alpha.-olefins, in which(1) a silicon dioxide-containing support gel is prepared by(1.1) introducing a sodium water glass or potassium water glass solution into a swirling stream of an aqueous mineral acid longitudinally and tangentially to the stream, spraying the resultant silica hydrosol in drop form into a gaseous medium and allowing it to solidify to form a hydrogel, and freeing the resultant hydrogel from salts by washing without prior ageing,(1.2) drying the hydrogel resulting from (1.1) to form the support gel,(2) the support gel (1) is charged with chromium trioxide or a chromium compound which can be converted into chromium trioxide under the conditions of process step (3), giving a chromium-containing support gel, and(3) the chromium-containing support gel (2) is heated at from 400.degree. to 1100.degree. C. for from 10 to 1000 minutes in an anhydrous gas stream containing oxygen in a concentration of greater than 10% by volume,comprises drying the hydrogel resulting from step (1.1) in step (1.2) within a time of not more than 60 seconds in a shaping, high-speed dryer at an inlet temperature of from 80.degree. to 400.degree. C.
摘要翻译:一种制备用于α-烯烃聚合的负载催化剂的方法,其中(1)含二氧化硅的载体凝胶通过(1.1)将钠水玻璃或钾水玻璃溶液引入旋流 将水性无机酸纵向和切向于料流,将所得的二氧化硅水溶胶以液滴形式喷雾到气态介质中并使其固化形成水凝胶,并通过在没有预先熟化的情况下洗涤将所得水凝胶从盐中释放,(1.2)干燥 由(1.1)产生的形成支持凝胶的水凝胶,(2)载体凝胶(1)中加入三氧化铬或铬化合物,其可以在工艺步骤(3)的条件下转化为三氧化铬,得到 含铬载体凝胶,(3)含铬载体凝胶(2)在含有浓度浓度的氧的无水气流中在400〜1100℃下加热10〜1000分钟 大于10体积%包括在入口温度为80°至400°的成形高速干燥器中在不超过60秒的时间内将步骤(1.2)中由步骤(1.1)得到的水凝胶干燥 DEG C.
摘要:
A Phillips catalyst for the polymerization of .alpha.-olefins, containing, as a catalytically active component, at least one chromium(III) compound on a silicon aluminum phosphate carrier of the general formula (I)(Si.sub.x Al.sub.y P.sub.z)O.sub.2 (I)where x is from 0.05 to 0.5 and y and z are each from 0.1 to 1.0, exhibits in particular high productivity and is preferably used for the preparation of homo- and copolymers of ethylene.
摘要:
A novel Phillips catalyst for the homopolymerization of ethylene and the copolymerization of ethylene with .alpha.-olefins contains as catalytically active components a specific chromium catalyst on an aluminum phosphate support and cocatalysts of the formula I to IV, ##STR1## where M is lithium, sodium and potassium,M.sup.1 is magnesium and zinc,M.sup.2 is boron and aluminum,R is C.sub.1 -C.sub.10 -alkyl and C.sub.6 -C.sub.20 -aryl,R.sup.1 is R and C.sub.1 -C.sub.10 -alkoxy and C.sub.6 -C.sub.20 -aryloxy,X is chlorine, bromine and iodine,n is 0, 1 and 2The chromium catalyst on an aluminum phosphate support can be obtained by applying chromium compounds to a finely divided aluminum phosphate with a P:A1 molar ratio near to or equal to 1 and a pore volume of >1 cm.sup.3 /g and activating the resulting intermediate at elevated temperatures in an oxidizing atmosphere. The novel Phillips catalyst has an exceptionally long duration of activity and its productivity can be increased further by adding hydrogen.
摘要:
In order to pick up in a simple manner which is reliable, and under rough operating conditions, a rotation of the rotor in a miniature motor excited by permanent magnets with magnet segments at a tangential distance with magnet segments distributed at the bore circumference of the stator, it is proposed to arrange in at least one pole gap between the magnet segment a measuring coil. A signal is induced by the pulsation of the stray field due to rotation of the rotor. The measuring coil is advantageously arranged in a non-magnetic, preferably plastic support body held between the individual poles or the magnet segments respectively.
摘要:
A novel Phillips catalyst for the copolymerization of ethylene with .alpha.-olefins, contains, as a catalytically active component, a finely divided, aluminum silicate-supported, phosphorus-containing chromium catalyst. This can be prepared by applying at least one organic phosphorus(III), (IV) and/or (V) compound and at least one chromium(III) compound which does not react with said phosphorus compounds under the reaction conditions used, in succcession in any order or simultaneously, to a finely divided aluminum silicate hydrogel or xerogel with formation of a catalyst intermediate and activating the catalyst intermediate at elevated temperatures in an oxidizing atmosphere, with the result that the chromium catalyst is formed. The novel Phillips catalyst gives ethylene/.alpha.-olefin copolymers in which the comonomers are more uniformly distributed over the copolymer chains than is the case with ethylene/.alpha.-olefin copolymers which have been prepared with the aid of conventional Phillips catalysts. Moldings which have been produced from the ethylene/.alpha.-olefin copolymers obtained in the novel procedure have a particularly high environmental stress cracking resistance and an excellent creep rupture strength.
摘要:
A process for propene oligomerization catalyzed by transition metal complexes in liquid phase to give propene oligomers with a high content of terminal double bonds, comprises oligomerizing propene in the presence of a catalyst of the formula ICp.sub.2 MX.sub.2 Iwhere Cp is an unsubstituted cyclopentadienyl unit and/or a mono-C.sub.1 -C.sub.4 -alkylcyclopentadienyl unit, M is zirconium or hafnium and the ligands X are each hydride and/or halide and/or methyl, and in the presence of an aluminoxane cocatalyst, and where the ratio of the amounts of the catalyst I and the aluminoxane cocatalyst is such that the M/Al atomic ratio is from 1:250 to 1:1000, employing a temperature of from 50.degree. to 110.degree. C. and a pressure of from 30 to 100 bar.
摘要:
A novel Phillips catalyst for the copolymerization of ethylene with .alpha.-olefins, contains, as a catalytically active component, a finely divided, aluminum silicate-supported, phosphorus-containing chromium catalyst. This can be prepared by applying at least one organic phosphorus(III), (IV) and/or (V) compound and at least one chromium(III) compound which does not react with said phosphorus compounds under the reaction conditions used, in succcession in any order or simultaneously, to a finely divided aluminum silicate hydrogel or xerogel with formation of a catalyst intermediate and activating the catalyst intermediate at elevated temperatures in an oxidizing atmosphere, with the result that the chromium catalyst is formed. The novel Phillips catalyst gives ethylene/.alpha.-olefin copolymers in which the comonomers are more uniformly distributed over the copolymer chains than is the case with ethylene/.alpha.-olefin copolymers which have been prepared with the aid of conventional Phillips catalysts. Moldings which have been produced from the ethylene/.alpha.-olefin copolymers obtained in the novel procedure have a particularly high environmental stress cracking resistance and an excellent creep rupture strength.
摘要:
A non-aqueous rinsing medium is disclosed, and a process for using same as a rinsing agent in a process for spray-coating of mass-produced substrates (such as automobile bodies) with frequent changes between at least one aqueous and at least one non-aqueous coating agent inside a spray-coating chamber, wherein with at least each change of coating agent the installations to be rinsed are rinsed automatically with the non-aqueous rinsing medium consisting of (a) 20 to 35% by weight of one or more N-alkyl pyrrolidones, (b) 20 to 35% by weight of butyl acetate and/or isobutyl acetate, (c) 10 to 20% by weight of one or more glycol ethers, which are water-miscible without miscibility gap, (d) 5 to 15% by weight of ethanol, propanol and/or isopropanol, (e) 10 to 20% by weight of one or more aliphatic C4-C7-ketones, (f) 0 to 5% by weight of one or more organic solvents conventionally used in coating agents, and (g) 0 to 5% by weight of one or more auxiliary agents, whereby components (a), (c) and (d) comprise 40 to 60% by weight of the total rinsing medium.
摘要:
A process for the preparation of a supported catalyst for the polymerization of .alpha.-olefins, in which(1) a silicon dioxide-containing support gel is prepared by(1.1) introducing a sodium water glass or potassium water glass solution into a swirling stream of an aqueous mineral acid longitudinally and tangentially to the stream, spraying the resultant silica hydrosol in drop form into a gaseous medium and allowing it to solidify to form a hydrogel, and freeing the resultant hydrogel from salts by washing without prior ageing,(1.2) drying the hydrogel resulting from (1.1) to form the support gel,(2) the support gel (1) is charged with chromium trioxide or a chromium compound which can be converted into chromium trioxide under the conditions of process step (3), giving a chromium-containing support gel, and(3) the chromium-containing support gel (2) is heated at from 400.degree. to 1100.degree. C. for from 10 to 1000 minutes in an anhydrous gas stream containing oxygen in a concentration of greater than 10% by volume,comprises drying the hydrogel resulting from step (1.1) in step (1.2) within a time of not more than 60 seconds in a shaping, high-speed dryer at an inlet temperature of from 80.degree. to 400.degree. C.
摘要翻译:一种制备用于α-烯烃聚合的负载催化剂的方法,其中(1)含二氧化硅的载体凝胶通过(1.1)将钠水玻璃或钾水玻璃溶液引入旋流 将水性无机酸纵向和切向于料流,将所得的二氧化硅水溶胶以液滴形式喷雾到气态介质中并使其固化形成水凝胶,并通过在没有预先熟化的情况下洗涤将所得水凝胶从盐中释放,(1.2)干燥 由(1.1)产生的形成支持凝胶的水凝胶,(2)载体凝胶(1)中加入三氧化铬或铬化合物,其可以在工艺步骤(3)的条件下转化为三氧化铬,得到 含铬载体凝胶,(3)含铬载体凝胶(2)在含有浓度浓度的氧的无水气流中在400〜1100℃下加热10〜1000分钟 大于10体积%包括在入口温度为80°至400°的成形高速干燥器中在不超过60秒的时间内将步骤(1.2)中由步骤(1.1)得到的水凝胶干燥 DEG C.