摘要:
There is described a continuous process for the oxidative cleavage of derivatives of unsaturated carboxylic acids for the production of saturated carboxylic acids and their derivatives comprising the steps of: a) feeding to a first reactor at least a derivative of an unsaturated carboxylic acid, an oxidizing compound and a catalyst capable of catalyzing the oxidation reaction of the olefinic double bond to obtain an intermediate compound containing vicinal diols, and of b) feeding to a second reactor said intermediate compound, a compound containing oxygen and a catalyst capable of catalyzing the oxidation reaction of the vicinal diols to carboxylic groups, to obtain saturated monocarboxylic acids (i) and derivatives of saturated carboxylic acids with more than one acid function (ii); c) separating the saturated monocarboxylic acids (i) from the derivatives of carboxylic acids having more than one acid function (ii).
摘要:
There is described a continuous process for the oxidative cleavage of derivatives of unsaturated carboxylic acids for the production of saturated carboxylic acids and their derivatives comprising the steps of: a) feeding to a first reactor at least a derivative of an unsaturated carboxylic acid, an oxidizing compound and a catalyst capable of catalyzing the oxidation reaction of the olefinic double bond to obtain an intermediate compound containing vicinal diols, and of b) feeding to a second reactor said intermediate compound, a compound containing oxygen and a catalyst capable of catalyzing the oxidation reaction of the vicinal diols to carboxylic groups, to obtain saturated monocarboxylic acids (i) and derivatives of saturated carboxylic acids with more than one acid function (ii); c) separating the saturated monocarboxylic acids (i) from the derivatives of carboxylic acids having more than one acid function (ii).
摘要:
A device for providing instant cooling, particularly for treating parts of the human body or items in general, comprising a diffuser which is adapted to be charged with a gas, the diffuser being provided with a plurality of holes for releasing the gas, the diffuser being accommodated in a container which contains a thermally insulating material which is adapted to absorb the low temperature generated by the gas, the container being sealed around the diffuser.
摘要:
Process for the preparation of a flexible, thermoplastic, composite filament, containing continuous fibers basically consisting of a flexible sheath made of polyolefinic resin which covers a bundle of fibers impregnated with a polyolefmic resin, wherein the inorganic fibers are treated with a solution containing additives which improve the compatibility between reinforcement and polymeric matrix after transformation into end products.
摘要:
There is described a continuous process for the oxidative cleavage of vegetable oils containing triglycerides of unsaturated carboxylic acids, for the obtainment of saturated carboxylic acids, comprising the steps of: a) feeding to a first continuous reactor at least a vegetable oil, an oxidizing compound and a catalyst capable of catalyzing the oxidation reaction of the olefinic double bond to obtain an intermediate compound containing vicinal diols, and of b) feeding to a second continuous reactor said intermediate compound, a compound containing oxygen and a catalyst capable of catalyzing the oxidation reaction of the vicinal diols to carboxylic groups, to obtain saturated monocarboxylic acids (i) and triglycerides containing saturated carboxylic acids with more than one acid function (ii); c) separating the saturated monocarboxylic acids (i) from the triglycerides having more than one acid function (ii). d) hydrolyzing in a third reactor the triglycerides having more than one acid function (ii) to obtain glycerol and saturated carboxylic acids with more than one acid function.
摘要:
There is described a continuous process for the oxidative cleavage of vegetable oils containing triglycerides of unsaturated carboxylic acids, for the obtainment of saturated carboxylic acids, comprising the steps of: a) feeding to a first continuous reactor at least a vegetable oil, an oxidizing compound and a catalyst capable of catalyzing the oxidation reaction of the olefinic double bond to obtain an intermediate compound containing vicinal diols, and of b) feeding to a second continuous reactor said intermediate compound, a compound containing oxygen and a catalyst capable of catalyzing the oxidation reaction of the vicinal diols to carboxylic groups, to obtain saturated monocarboxylic acids (i) and triglycerides containing saturated carboxylic acids with more than one acid function (ii); c) separating the saturated monocarboxylic acids (i) from the triglycerides having more than one acid function (ii). d) hydrolyzing in a third reactor the triglycerides having more than one acid function (ii) to obtain glycerol and saturated carboxylic acids with more than one acid function.
摘要:
A hip joint for orthopedic orthesis comprising a pelvic attachment to which the tops of two arms are articulated, and in which the arms are adapted to be rigidly coupled to the top of respective thigh-leg-foot braces and are provided with respective hip locking devices that can be disengaged manually to allow the patient to sit; two bushes having substantially vertical axes are fixed laterally to the pelvic attachment and two shafts are articulated to the bushes; the arms are articulated to the shafts in a downward region about substantially horizontal axes; the arms are provided with elements for kinematic connection to the bushes, so that each torsion of the shaft with respect to the bush is matched by a rotation of the arm with respect to the shaft; and the arms are connected by motion transmission elements adapted to complementarily transmit the rotation-torsion movements from one arm to the other.
摘要:
Device and system for producing instant cooling, particularly for lowering the temperature of liquids and beverages contained in bottles. The same device can be used, by means of appropriate positioning of the diffusers in specific trays, for cooling foods. Moreover, the diffusers appropriately positioned in insulated containers act as portable refrigeration cabinet for foods, beverages and any product or material that requires to be preserved at low temperatures.The particular characteristic consists in the fact that the device makes use of a container having parts suitable to be filled with gas. Said container has one part acting as a chamber which stores the dry ice formed by the gas and one part made of sintered metal through which heat exchange is triggered when in contact with the product to be cooled.
摘要:
A device for providing instant cooling, particularly for treating parts of the human body or items in general, comprising a diffuser which is adapted to be charged with a gas, the diffuser being provided with a plurality of holes for releasing the gas, the diffuser being accommodated in a container which contains a thermally insulating material which is adapted to absorb the low temperature generated by the gas, the container being sealed around the diffuser.
摘要:
A mixed-matrix composite material reinforced with continuous fibre comprising a flexible sheath of thermoplastic polymer covering a multifibre filament impregnated with a powder consisting of:1-99% by weight, and preferably 50-95%, of a thermoplastic polymer;99-1% by weight, and preferably 50-5%, of a reactive monomer and/or prepolymer which on thermal stressing is able to undergo crosslinking and/or molecular weight increase.