摘要:
Process for the solubilization of polymeric material deposited on a porous medium, which comprises putting said polymeric material in contact with an aqueous composition comprising: (a) a catalyst selected from: (a1) a complex having general formula (I), Fe++(L)n(Y)s, L being a binder selected from those having general formula (II), wherein X═CH, N, (a2) a hydrosoluble cobalt2+ salt, preferably cobalt acetate; (b) an oxidizing agent selected from: (b1) hydrogen peroxide, (b2) MHSO5, wherein M is an alkaline metal, preferably potassium; with the constraint that the catalyst (a1) can only be used in the presence of the oxidizing agent (b1) and the catalyst (a2) can only be used in the presence of the catalyst (b2).
摘要:
A process is described for the preparation of hydrogen peroxide by the reaction of carbon monoxide, oxygen and water in an organic solvent immiscible with water, in the presence of a catalytic complex soluble in the organic solvent, deriving from the combination of a palladium salt, a non-coordinating organic or inorganic acid and a ligand capable of binding itself to the palladium atom, characterized in that said ligand is a mono or polydentate nitrogenated compound.
摘要:
Compositions of formula (I):Q.sub.3 XW.sub.4 O.sub.24-2n (I)wherein:Q represents a cation of an "onium" salt;X is either a P or an As atom; whilen is 0, 1 or 2.The preparative method consists in reacting an oxygenated tungsten (VI) derivative, an oxygenated P (V) or As (V) derivative, and hydrogen peroxide, in an aqueous acid phase, with and "onium" salt or a precursor thereof, if desired contained in an organic phase immiscible with the aqueous phase, at substantially room temperature. The oxygenated compounds of W (VI), P (V) or As (V) may be prepared "in situ" under the conditions of the reaction.Compositions (I), which appear as solids or as viscous oils, find use as oxidizing agents in general in oxidation processes, and especially as epoxidation catalysts for olefinic compounds, both in a homogeneous phase as well as in a heterogeneous phase, and preferably according to the phase-transfer technique, in the presence of oxidizing agents.
摘要:
Compositions of formula (I):Q.sub.3 XW.sub.4 O.sub.24-2n (I)wherein:Q represents a cation of an "onium" salt;X is either a P or an As atom; whilen is 0, 1 or 2.The preparative method consists in reacting an oxygenated tungsten (VI) derivative, an oxygenated P (V) or As (V) derivative, and hydrogen peroxide, in an aqueous acid phase, with an "onium" salt or a precursor thereof, if desired contained in an organic phase immiscible with the aqueous phase, at substantially room temperature. The oxygenated compounds of W (VI), P (V) or As (V) may be prepared "in situ" under the conditions of the reaction.Compositions (I), which appear as solids or as viscous oils, find use as oxidizing agents in general in oxidation processes, and especially as epoxidation catalysts for olefinic compounds, both in a homogeneous phase as well as in a heterogeneous phase, and preferably according to the phase-transfer technique, in the presence of oxidizing agents.
摘要:
Process for the preparation of phenylpropanones having formula: ##STR1## R and R.sub.1, equal or different, being C.sub.1 -C.sub.4 alkyl groups or being coincident in the CH.sub.2 group of a heterocyclic ring, wherein the corresponding allylbenzenes are catalytically epoxidized by means of H.sub.2 O.sub.2, in a biphase system comprising an aqueous phase containing H.sub.2 O.sub.2 and an organic phase containing said allylbenzenes, a solvent immiscible with said aqueous phase and a catalyst having formula Q.sub.3 XW.sub.4 O.sub.24 (Q being a quaternary cation containing hydrocarbylic groups having on the whole from 20 to 70 C atoms, and X being P or As) and wherein the thus obtained epoxides are isomerized by heating at 90.degree.-150.degree. C., in the presence of catalytic amounts of LiI.
摘要翻译:制备具有下式的苯丙酮的方法:R和R 1相同或不同,为C 1 -C 4烷基或在杂环的CH 2基团中重合,其中相应的烯丙基苯通过H 2 O 2进行催化环氧化, 在包含含有H 2 O 2的水相和含有所述烯丙苯的有机相的二相体系中,与所述水相不混溶的溶剂和具有式Q3XW4O24的催化剂(Q是含有总共20至70个C原子的烃基的季阳离子) ,X为P或As),其中由此得到的环氧化物通过在催化量的LiI存在下在90°-150℃下加热异构化。
摘要:
A process for the production of bio-oil from solid urban waste, comprising the following steps: a) subjecting said solid urban waste to liquefaction, obtaining a mixture including an oily phase consisting of bio-oil, a solid phase and an aqueous phase; b) subjecting the aqueous phase obtained in the liquefaction step a) to fermentation, obtaining a fermented biomass; c) feeding the fermented biomass obtained in the fermentation step b) to the liquefaction step a). The bio-oil (or bio-crude) thus obtained can be advantageously used in the production of biofuels which can be used as such or mixed with other motor vehicle fuels. Alternatively, this bio-oil (or bio-crude) can be used as such (biocombustible) or mixed with fossil combustibles (combustible oil, coal, etc.) for the generation of electric energy or heat.
摘要:
A process for the production of bio-oil from solid urban waste, comprising the following steps: a) subjecting said solid urban waste to liquefaction, obtaining a mixture including an oily phase consisting of bio-oil, a solid phase and an aqueous phase; b) subjecting the aqueous phase obtained in the liquefaction step a) to fermentation, obtaining a fermented biomass; c) feeding the fermented biomass obtained in the fermentation step b) to the liquefaction step a). The bio-oil (or bio-crude) thus obtained can be advantageously used in the production of biofuels which can be used as such or mixed with other motor vehicle fuels. Alternatively, this bio-oil (or bio-crude) can be used as such (biocombustible) or mixed with fossil combustibles (combustible oil, coal, etc.) for the generation of electric energy or heat.
摘要:
Process for preparing compounds according to formula (I) ##STR1## wherein R.sub.1 and R.sub.2 represent a hydrogen atom or a protective group and R.sub.3 represents a C.sub.1 -C.sub.10 alkyl or an aryl group, by oxidation of compounds according to formula (II) ##STR2## wherein R.sub.1, R.sub.2 and R.sub.3 have the above-mentioned meanings, in a two-phase system comprising:a) an organic phase including a 4-acylazetidinone compound (II) and an "onium" salt dissolved in a medium immiscible with water,b) an aqueous solution including an alkali or alkaline-earth metal salt of an organic or inorganic peracid.4-Acyloxyazetidinones (I) are useful intermediates in the synthesis of anti-bacterial compounds.
摘要:
The invention relates to a significantly improved process for the preparation of benzothiadxazole compounds which can be used in the production of Luminescent Solar Concentrators, (LSC). In particular, the synthesis process of the present invention is oriented towards the preparation of 4,-di-2-thienyl-2,1,3-benzo-thiadiazole.
摘要:
A skate with adjustable size has a toe unit and a heel unit. The heel unit is slidingly associated with the toe unit through sliders and a fastener constituted by a screw is adapted to adjust and lock the mutual axial position of the heel unit with respect of the toe unit. The fastener is operated through a folding lever associated with the skate.