摘要:
4-aminodiphenylamines are produced by hydrogenating nitrobenzene with hydrogen in the presence of bases containing hydroxide and/or oxide groups and heterogeneous catalysts and in the presence of inert aprotic solvents at temperatures of 0 to 200.degree. C. and pressures of 0.1 to 150 bars.
摘要:
Aromatic amines are produced by hydrogenation of the associated aromatic nitro compounds in the gas phase over fixed catalysts. The catalysts contain active hydrogenation metals on supports. The reaction is conducted at a pressure of 2-50 bar and at a temperature in the range 250.degree.-500.degree. C. under adiabatic conditions. A circulating gas is passed over the catalyst, which circulating gas contains 3-150 moles of hydrogen, 2-100 moles of the amino groups to be formed per mole of nitro groups, and 2 to 6 moles of water per amino group equivalent. The amine and water formed, as well as a purification stream, are separated from the circulating gas. Thereafter the circulating gas is enriched with volatilised aromatic nitro compound and fresh hydrogen and recycled.
摘要:
Polysaccharides corresponding to formula (I) ##STR1## in which S is a recurrent monosaccharide unit andB is a group of formula (Ia) attached to the monosaccharide unit S by an O atom ##STR2## are prepared by reaction of polysaccharides with an alkyl halide corresponding to formula (II) ##STR3##
摘要:
Carbonates with aromatic ester groups may be prepared by reacting aromatic monohydroxy compounds with phosgene or with chloroformates of aromatic monohydroxy compounds, wherein reaction takes place at a temperature in the range 50.degree. to 350.degree. C. in the presence of aluminum oxides as heterogeneous catalysts.
摘要:
Alkylene carbonates can be prepared by catalytic reaction of alkylene oxides with carbon dioxide, catalysts which can be regenerated of the formulaa[MX]/b[ZnY.sub.2 ] (III)whereinM denotes an alkali metal,X and Y independently of one another denote chlorine, bromine or iodine anda and b denote fractions or integers in a range from 0.001 to 2being employed.The catalysts (III) can be regenerated by treating with a halogen compound. The halogen compounds which can be used for this purpose belong to the group comprising hydrogen halides, inorganic and organic acid halides, interhalogen compounds and organic halides with mobile halogen.
摘要翻译:碳酸亚烷基酯可以通过烯化氧与二氧化碳的催化反应制备,催化剂可以再生成式[MX] / b [ZnY 2](III),其中M表示碱金属,X和Y彼此独立地表示 氯,溴或碘,a和b表示使用0.001至2范围内的分数或整数。 催化剂(III)可以通过用卤素化合物处理再生。 可以用于此目的的卤素化合物属于包含卤化氢,无机和有机酰卤,卤间化合物和具有可移动卤素的有机卤化物的基团。
摘要:
New thermoreactive recording materials contain at least one salt of a specially modified bisphenolcarboxylic acid and are distinguished by good stabilisation of the ink, even upon extended storage time, good light stabilities and excellent stabilities to water, plasticisers, fats and substances contained in text-marking pens.
摘要:
Thermoplastic moulding compounds of 99.8-95% by weight of a mixture consisting of an aromatic polycarbonate, a graft polymer and optionally a thermoplastic vinyl polymer and/or the usual additives and 0.2 to 5% by weight of a polyalkylene ether which has been grafted with a polymer of C.sub.1 -C.sub.6 alkyl(meth)acrylates, cyclo-alkylacrylates or -methacrylates and optionally styrene or .alpha.-methylstyrene.
摘要:
Copolymers containing nitrile groups based on ethylenically unsaturated monomers are prepared by reacting the copolymers on which they are based with ammonia at temperatures of from 150.degree. to 270.degree. C. and pressures from 30 to 350 bar in the presence of an aliphatic nitrile and/or dinitrile.
摘要:
A thermoplastic molding composition is disclosed comprising a polydiorganosiloxane-polycarbonate block cocondensate and 0.5% to 15% by weight of a particular hydroxy benzotriazole. The composition is characterized by its improved protection against UV light.