11 results about "Pentafluoropropane" patented technology

The invention belongs to the field of refrigerants, the field of fire fighting, the field of fluorine chemical engineering new materials, the field of foaming agents and the field of chemical synthesis, and particularly relates to a synthesis method of 1, 1, 1, 2, 3-pentafluoropropane and 2, 3, 3, 3-tetrafluoropropene. The synthesis method of the 1, 1, 1, 2, 3-pentafluoropropane comprises the following steps: carrying out a first reaction on 3, 3, 3-trifluoropropene, a first catalyst, an HF source and a selective fluorine reagent in a first solvent to obtain the 1, 1, 1, 2, 3-pentafluoropropane. The synthetic method of the 2, 3, 3, 3-tetrafluoropropene comprises the following step: carrying out a second reaction on the obtained 1, 1, 1, 2, 3-pentafluoropropane in the presence of a second catalyst to obtain the 2, 3, 3, 3-tetrafluoropropene. The synthesis method of 1, 1, 1, 2, 3-pentafluoropropane provided by the invention has the advantages of simplicity in operation, short time consumption, mild reaction, simple reagents required by reaction, high substrate conversion rate, high target product selectivity and the like, and is beneficial to industrial production. The preparation method of 2, 3, 3, 3-tetrafluoropropene provided by the invention has the advantages of safety, environmental protection, simplicity in operation, mild reaction, high yield, high target product selectivity, high reaction speed and the like, and is beneficial to industrial production.

The utility model discloses a cooler for separating perfluoropropane byproduct HCL, which comprises a base, an HCL separating tower body is arranged on one side of the top of the base, an L-shaped plate is fixedly connected to the outer contour of the HCL separating tower body close to the top, a connecting plate is slidably connected to one side of the L-shaped plate far away from the HCL separating tower body in a limited manner, and the connecting plate is fixedly connected to the connecting plate. A cooler body is fixedly connected to the top of the connecting plate, and a lifting supporting mechanism is arranged on the other side of the top of the base. According to the utility model, through the arrangement of the liftable supporting mechanism, the cooler body can be placed on the connecting plate before the cooler body is installed, then the cooler body is moved upwards to a specified position, then the protective shell can be closed through the proximity switch, and then a worker connects parts on the connecting plate with parts on the HCL separation tower body; the cooler body is convenient to mount and dismount by a worker, and the maintenance efficiency of the cooler body by the worker is improved.

A fluoropropene composition comprising Z-1,3,3,3-tetrafluoropropene, E-1,3,3,3-tetrafluoropropene, 2,3,3,3-tetrafluoropropene, and optionally 1,1,1,3,3-pentafluoropropane wherein the 2,3,3,3-tetrafluoropropene being present in an amount of 0.001 to 1.0%. A method of producing the fluoropropene, methods for using the fluoropropene and the composition formed are also disclosed.

A method for reducing 1,1,1,2,2-pentafluoropropane (HFC-245cb) in a trans-1,3,3,3-tetrafluoropropene (HFO-1234ze(E)) production process, including catalyst adjustment, temperature reduction, and shortening of contact time. The method comprises defluoridating 1,1,1,3,3-pentafluoropropane (HFC-245fa) with a catalyst mixture to produce a product mixture having HFO-1234ze(E) and HFC-245cb, and reducing the formation of HFC-245cb by incorporating a modified catalyst, using a lower temperature for defluoridation, or shortening the contact time for defluoridation.

High boiling fluorinated by-products obtained from a manufacturing process of 1-chloro-3,3,3-trifluoropropene (HFO-1233zd) not only include components that can be used as a starting material or feedstock in the production of 1,1,1,3,3-pentafluoropropane (HFC-245fa), but also contain impurities that can be detrimental in the HFC-245fa process. A method of providing an improved composition from the high boiling by-products obtained from an HFO-1233zd manufacturing process reduces these impurities. The improved composition can be used as a starting material or feedstock for the production of HFC-245fa.

Embodiments of the present disclosure are directed towards isocyanate-reactive compositions including a sorbitol-initiated polyether polyol, a high hydroxyl number glycerin-initiated polyether polyol, an ethylenediamine-initiated polyether polyol, a propylene glycol-initiated polyether polyol, a low hydroxyl number glycerin-initiated polyether polyol, pentafluoro propane, dichloromethane, wherein a combination of the pentafluoro propane and the dichloromethane is from 5 to 14 weight percent of the isocyanate-reactive composition based upon the total weight of the isocyanate-reactive composition, and water.

The present application provides a kind of composition, preparation and its preparation method and purposes for treating skin pruritus.The composition for treating skin pruritus is composed of hydrocarbon halide and / or hydrocarbon.The hydrocarbon halide is one, two or more than three combinations of difluoromonochloromethane, difluoromethane, trifluoromonochloromethane, tetrafluoromethane, dichlorotrifluoroethane, difluoroethane, monochlorodifluoroethane, tetrafluoroethane, hexafluoroethane, chloroethane, pentafluoropropane and / or octafluoropropane.The hydrocarbon is one, two or more than three combinations of methane, ethane, propane, butane, cycloethane, cyclopropane and / or cyclobutane.The composition or preparation of the present application has excellent effects when used as a drug for treating skin pruritus, such as relieving pruritus symptoms quickly, reducing the risk of infection, shortening the course of the disease and reducing the economic burden of patients.

The application relates to the field of building board preparation, and particularly discloses a light thermal-insulation composite external wall board and a preparation method thereof, and a preparation method of the light thermal-insulation composite external wall board, which comprises the following steps: mixing raw materials of a thermal-insulation core material, extruding and foaming by injecting a foaming agent, and cooling and shaping to obtain the thermal-insulation core material; the foaming agent is carbon dioxide and / or 1,1,1,3,3-pentafluoropropane, the nucleating agent is talcum powder which is prepared by sequentially carrying out in-situ grafting and amidation reaction of amino silane and maleic anhydride after intercalation treatment; pouring a bottom layer of a surface layer cement-based light mortar in a mold, laying the thermal-insulation core material, pouring an upper layer of the surface layer cement-based light mortar, and preparing the light thermal-insulation composite external wall board through initial setting and maintenance. The foaming process is mild and controllable, and the nucleating agent cooperates to further ensure that the cells are uniform, fine and high in closed cell rate, so that the core layer is light in weight, high in thermal insulation, fireproof and durable.

The invention discloses carbon dioxide catalytic modified silica aerogel and a production method thereof, and relates to the technical field of production of building thermal insulation materials. The preparation method comprises the following steps: diluting water glass with water, dropwise adding the diluted water glass into a mixed solution of water and dilute nitric acid, dropwise adding dilute ammonia water to adjust the pH value, heating in a water bath, soaking in a sodium methylsilanolate aqueous solution, isopropanol and a dilute alkali solution, placing in a high-temperature and high-pressure reaction kettle, adding HMDZ, normal hexane and isopropanol, introducing carbon dioxide for modification, adding pentafluoropropane, heating to separate normal hexane, and cooling to room temperature. And drying to obtain the carbon dioxide catalytic modified silica aerogel. Carbon dioxide is introduced for modification, the situation that acid serves as a catalyst, the water content in a system is increased is avoided, excessive consumption of a modifier is reduced, meanwhile, the washing process is omitted, the acid and alkali resistance of equipment is reduced, the boiling point of pentafluoropropane is low, the flame retardant effect is achieved, and the preparation process is safer. The carbon dioxide catalytic modified silica aerogel disclosed by the invention has good hydrophobicity, low heat conductivity and low density.

Fluoroether 3-(difluoromethoxy)-1,1,1,2,2-pentafluoropropane ("HFE-347mcf") may be used as a refrigerant and / or heat transfer composition in single-phase and two-phase cooling systems, and a method for heating and / or cooling electronic components or devices comprises providing a heat transfer fluid containing at least about 10% by weight of 3-(difluoromethoxy)-1,1,1,2,2-pentafluoropropane, and transferring heat between the electronic components and the heat transfer fluid. Fluoroether 3-(difluoromethoxy)-1,1,1,2,2-pentafluoropropane can be synthesized by reacting 2,2,3,3,3-pentafluoro-1-propanol with chlorodifluoromethane (R-22).

The application provides an environment-friendly mixed refrigerant, a preparation method and application thereof. The environment-friendly mixed refrigerant comprises a first component, a second component and a third component, the first component is 1,1,2-trifluoroethylene, the second component is fluoroethane, and the third component is dimethyl ether, difluoroethane, trans-1,3,3,3-tetrafluoropropene, isobutane, n-butane or 1,1,1,3,3-pentafluoropropene. The environment-friendly mixed refrigerant has good environmental characteristics, the GWP is lower than 150, can significantly improve the operation energy efficiency of a refrigeration system, achieves the purpose of energy saving, and can balance low GWP and high system energy efficiency.