摘要:
A process for the epoxidation of olefinic compounds, consisting of reacting said compounds with hydrogen peroxide either introduced as such or produced by substances capable of generating it under the reaction conditions, in the presence of synthetic zeolites containing titanium atoms, of general formula:xTiO.sub.2.(1-x)SiO.sub.2,where x lies between 0.0001 and 0.04, and possibly in the presence of one or more solvents, operating at a temperature of between 0.degree. and 150.degree. C., and at a pressure of between 1 and 100 ata.
摘要:
A process for the synthesis of glycol monomethylethers consisting of reacting an olefin compound, methanol and hydrogen peroxide in aqueous solution in the presence of synthetic zeolites containing titanium atoms, of general formula:xTiO.sub.2.(1-x)SiO.sub.2,where x lies between 0.0001 and 0.04.
摘要:
A process for oxidizing primary and/or secondary alcohols to the corresponding aldehyde and/or ketone derivatives, consisting of reacting said alcohols with an aqueous solution of hydrogen peroxide in the presence of synthetic zeolites containing titanium atoms, of general formula:xTiO.sub.2.(1-x)SiO.sub.2,where x lies between 0.0001 and 0.04, and possibly in the presence of one or more solvents, operating at a temperature of between 20.degree. and 100.degree. C.
摘要:
A process for oxidizing vinylbenzene compounds, consisting of reacting said compounds with an aqueous solution of hydrogen peroxide in the presence of synthetic zeolites containing titanium atoms, of general formula:xTiO.sub.2.(1-x)SiO.sub.2where x lies between 0.0001 and 0.04, and possibly in the presence of one or more solvents, operating at a temperature of between 20.degree. and 150.degree. C.
摘要:
A process for isomerizing styrene or homologues to .beta.-phenylaldehydes, consisting of conducting the isomerization reaction in the presence of a catalyst constituted by synthetic zeolites containing titanium, of formulaxTiO.sub.2.(1-x)SiO.sub.2where x lies between 0.0001 and 0.04, and optionally in the presence of one or more solvents, operating at a temperature of between 30.degree. and 100.degree. C.
摘要:
A process for the hydroxylation of aromatic hydrocarbons by hydrogen peroxide, consisting in reacting said compounds in the presence of synthetic zeolites which contain heteroatoms, both replaced and exchanged.The reaction is carried out at a temperature comprised between 80.degree. C. and 120.degree. C. and in the presence of the hydrocarbon only or in the presence of a solvent which permits, at least partially, to admix the aromatic hydrocarbon with the hydrogen peroxide.
摘要:
A method is disclosed for preparing esters by reacting an olefin with an acid in the presence of oxygen and a catalyst system, the improvement consisting in that the catalyst system is a compound of tin or cerium, used in the presence of iodine or of a iodine-yielding compound. High productivities are achieved and no pollution problems are to be solved.
摘要:
An integrated clutch-transmission assembly for a road vehicle; the integrated clutch-transmission assembly has a power-assisted clutch having a number of first hydraulic actuators; a power-assisted transmission having a number of second hydraulic actuators; a high-pressure pump for the hydraulic actuators; a number of solenoid valves for controlling the hydraulic actuators; a housing having a first chamber housing the clutch, and a second chamber housing the transmission; and a flat supporting plate, which is housed removably inside the housing to separate the two chambers of the housing, has a first wall fitted with the clutch, and has a second wall parallel to and opposite the first wall and fitted with the high-pressure pump and at least some of the solenoid valves.
摘要:
A four-wheel-drive vehicle transmission (1) having a drive torque input shaft (8) rotated about a first axis of rotation (A); a front output shaft (10); a rear output shaft (12); an auxiliary tubular shaft (14) mounted alongside the input shaft (8) to rotate about a second axis of rotation (D); at least one first group of gears (15, 16) for selectively connecting the auxiliary tubular shaft (14) to the input shaft (8); a first countershaft (17) mounted inside the auxiliary tubular shaft (14); a second countershaft (18) mounted for rotation opposite the first countershaft (17); a planetary gear train (19) for mechanically connecting the auxiliary tubular shaft (14) to the first (17) and second (18) countershafts; and a first (25) and a second (26) cascade gear set for connecting the first and second countershafts (17,18) to the front and rear output shafts (10,12), respectively.
摘要:
Mixtures of additives in granular form comprising: one or more stabilizers for organic polymers; one or more organic or inorganic pigments; and/or one or more dyes; obtained by extrusion at a temperature capable of enabling the partial or total melting of the lowest-melting component. The above mixtures can be used in the stabilization and dyeing of organic polymers.