摘要:
A process is described for the continuous production of alcoholic or hydro-alcoholic solutions of hydrogen peroxide in a concentration ranging from 2 to 10% by weight and their direct use in oxidation processes. The process operates under high safety conditions and with a high productivity and molar selectivity towards the formation of H 2 O 2 .
摘要:
The present invention relates to a process for the transalkylation of hydrocarbons in the presence of a new zeolite having a beta-type crystalline structure, characterized by a distribution of the Lewis acid sites and Brønsted acid sites corresponding to a molar ratio [Lewis sites]/[Brønsted sites] equal to or higher than 1.5. This new zeolite is useful in preparation processes of alkylated aromatic hydrocarbons through the transalkylation of aromatic compounds. The preparation method of the new zeolite is also object of the present invention.
摘要:
The present invention relates to a new zeolite having a beta-type crystalline structure, characterized by a distribution of the Lewis acid sites and Brønsted acid sites corresponding to a molar ratio [Lewis sites]/[Brønsted sites] equal to or higher than 1.5. This new zeolite is useful in preparation processes of alkylated aromatic hydrocarbons through the alkylation and/or transalkylation of aromatic compounds. The preparation method of the new zeolite is also object of the present invention.
摘要:
A process is described for the preparation of phenol characterized in that the phenol is obtained by means of the hydrodeoxygenation of benzene-diols with hydrogen, operating in continuous, in an aqueous solution, at temperatures ranging from 250 to 500°C, at pressures of 1-100 bar and in the presence of a catalyst based on elements of group VIB or group VIII of the periodic table.
摘要:
A carbonate ester of an aliphatic triol or tetraol which can be defined with the following formula: wherein R1, R2, R' and p are as defined in the description, is used as a lubricating base with a low quantity of smoke for two-phase engines with internal combustion. Lubricating compositions are described which contain a carbonate ester (1) together with one or more products selected from solvents, bright stock, or other anti-seizing additives, plus normal additives.
摘要:
The invention relates to the use of organic carbonates having formula (I) wherein: n = 1-4 R and R' are two linear or branched alkyl radicals which contain a number of carbon atoms whose sum is equal to at least 5 and which can be the same or different, as solvents for the washing of metal surfaces.
摘要:
The invention relates to the use of organic carbonates having formula (I) wherein:
n = 1-4 R and R' are two linear or branched alkyl radicals which contain a number of carbon atoms whose sum is equal to at least 5 and which can be the same or different, as solvents for the washing of metal surfaces.
摘要:
A process is described for the synthesis of 2-hydroxy-4-alkyloxy benzophenone by the selective alkylation of 2,4-dihydroxy benzophenone with a dialkyl carbonate, in liquid phase, in the presence of suitable catalysts, at a temperature ranging between 120 and 220°C and at a total pressure ranging from 2 to 60 ate.