63results about How to "Low ODP" patented technology

Disclosed herein are laser cutting/etching assist fluids and methods of use thereof. The compounds include unsaturated fluorocarbons appropriate for use in laser assist applications.

Compositions and related methods for detecting leaks in HVAC/R components such as furnaces, portable gas heaters, swimming pool heaters, air conditioners, heat pumps, refrigerators, freezers, and other closed loop vapor compression systems, as well as heat exchangers. These compositions provide more sensitive detection of leaks in inaccessible areas of furnaces using low ODP and non-flammable compounds classified as hydrofluorochloro-ethers (HFCE's), hydrobromochlorofluoro-alkenes (HBCFA's) hydrofluoro-ethers (HFE's), and halogenated compounds which are either alkanes, alcohols, diones, acetates, ketones (e.g., butanones, pentanones), esters (e.g., propanoates), anhydrides, cycloalkanes (cycloparaffins), cycloalkenes (cycloolefins), heterocyclics (e.g., furans), and aromatics.

The invention relates to ultra-low-density rigid polyurethane foam with pentane and butane as foaming agents. The ultra-low-density rigid polyurethane foam is prepared by well premixing a component Aand a component B, and then well mechanically mixing and foaming the component A and the component B, wherein the component A is prepared from the components in parts by weight: 100 parts of pluronicpolyols, 4-15 parts of the pentane, 1-5 parts of a catalyst, 1-5 parts of an organosilicon surfactant, 1-2.5 parts of water and 0-3 parts of a nucleating agent, the component B is prepared from the components in parts by weight: 2-12 parts of the butane and 120-210 parts of polyisocyanates, and raw materials are based on 100 parts of pluronic polyols. According to the prepared foam, foam holes arefine and uniform, the heat conductivity coefficient is small, the compression strength is high, and the overall performance is excellent. The invention further discloses a preparation method of the rigid polyurethane foam.

The invention provides a refrigerant combination which can be directly filled to replace R22 in systems like domestic air-conditioners and heat pumps, and consists of pentafluoroethane(R125), 1,1,1,2-tetrafluorothane(R134a) and dimethylether(DME or RE170), the preparation method is that each component is done with physical mixture in liquid phase according to corresponding proportions, the refrigerant completely meets the requirements of environmental protection, the value of ODP is zero, the value of GWP is low, the thermal performance and parameters are rather near to R22, the pressure and the exhaust temperature of a compressor are lower than R22, the refrigerant can be directly filled without adjusting or exchanging any part or lubricating oil in present R22 systems, moreover, the cycle performance is similar to or slightly higher than R22.

The invention discloses a green mixed refrigerant, comprising 20-60 wt% of 2,3,3,3-tetrafluoro propylene or trans-1,3,3,3-tetrafluoro propylene, 5-30 wt% of 1,1-difluoroethane or 1,1,1,2-tetrafluoro ethane, and 35-60 wt% of difluoromethane. The preparation method is characterized by physically mixing the above ingredients according to corresponding ratio at normal temperature. According to the invention, because the volume refrigerating capacity of the green mixed refrigerant is very close to that of HCFC-22 and the condensation pressure of the green mixed refrigerant is lower than that of R410A, the green mixed refrigerant can be directly filled in existing refrigeration, air-conditioning or heat pump sets which use HCFC-22; and when HCFC-22 is replaced, the components and pipeline of the system have no need of redesigning. The green mixed refrigerant can be an alternative refrigerant to HCFC-22 and R410A.

The invention discloses an organic Rankine cycle mixed working medium containing toluene, which is applied to an engine waste heat system. The working medium is a two-component mixture composed of toluene and dichloro-fluoroethane in different mass percentages, and is suitable for being used as a working medium of a high-temperature ORC system in which the temperature of a heat source is 400 DEG C to 700 DEG C. The preparation method is as follows: performing physical mixing on the components according to designated matching at normal temperature, so as to obtain the corresponding mixed working medium. The ODP of the working medium is almost zero and the GWP is lower. The working medium has a good environmental property, conforms to the requirements for protecting the ozone layer and reducing the greenhouse effect, and can be directly applied to the high-temperature exhaust waste heat ORC system of an engine.

The invention discloses low-density hard polyurethane foam which is prepared by respectively premixing components A and components B, jointly mixing and foaming. The components A include, by weight, 100 parts of composite polyol, 5-15 parts of cyclopentane, 1.5-6 parts of amine catalyst, 1-5 parts of silicon surfactant and 0.8-2.5 parts of water, and the components B include, by weight, 1-10 partsof butane and 120-220 parts of isocyanate, wherein each raw material above is based on 100 parts of composite polyol. The preparation method includes following steps: (1), preparing the components A;(2), preparing the components B; (3), injecting the components A and the components B into a closed mold, allowing sufficient reaction, and demolding to obtain the hard polyurethane foam. The low-density hard polyurethane foam is environment-friendly and excellent in performance.

The invention relates to a heat preservation rigid polyurethane foam and a preparation method thereof. The heat preservation rigid polyurethane foam is prepared from the following raw materials by weight: 100 parts of combined polyether; 10-30 parts of a foaming agent; 1-2.6 parts of a foaming assistant; and 115-150 parts of isocyanate. Specifically, the foaming agent is one of 1, 1-dichloro-1-fluoroethane, 1-chloro-3, 3, 3-trifluoropropene, 1, 1, 1, 3, 3,-pentafluoropropane, 1, 1, 1, 4, 4, 4-hexafluoropropylene or cyclopentane; the foaming assistant is one of or a mixture of perfluoroolefineand hydrofluoroether, and the perfluoroolefine and hydrofluoroether are in a weight ratio of 100:0-100; the combined polyether is high functionality polyether; and the isocyanate is polymethylene polyphenyl isocyanate. The heat preservation rigid polyurethane foam has the characteristics of high compression strength, small cell size and low thermal conductivity, and can generate obvious energy saving and consumption reduction effects.

The invention discloses combined polyether, a raw material composition and rigid polyurethane foam as well as a preparation method and application of the combined polyether, the raw material composition and the polyurethane foam. The combined polyether comprises the following components in parts by weight: 3-5 parts of polyether polyol SU-450L, 2-4 parts of polyether polyol SA380, 3-5 parts of polyether polyol NL2010, 0.2-0.3 part of foam stabilizer, 0.1-0.3 part of catalyst, 0.7-0.9 part of alkane foaming agent and 0.18-0.22 part of water. The alkane foaming agent adopted by the combined polyether has the advantages of zero ODP (Ozone Depletion Potential) value and low GWP (Global Warming Potential) value. The rigid polyurethane foam disclosed by the invention is excellent in various aspects including size stability, compressive strength and heat conductivity coefficient and is suitable for being used as a heat preservation material for applications in industries such as steam, oil pipelines and the like.

The invention relates to an HFC-227ea-containing low-temperature organic mixed working medium for a Rankine cycle system, which comprises the following six components: HFC-227ea, R290, HFC-236ea, HFC-245ca, R601 and R601a. The mixed working medium specifically comprises the following components in percentage by mass: R227ea/R245ca (5-95/95-5%); R227ea/R601 (5-95/95-5%); R227ea/R601a (5-95/95-5%); R227ea/R236ea/R245ca (5-95/2-80/3-93%); R227ea/R236ea/R601 (5-90/5-80/5-90%); R227ea/R236ea/R601a (5-90/3-80/5-92%%); R227ea/R245ca/R601 (5-90/5-90/5-80%); and R227ea/R290/R601a (5-95/0-90/5-90%). The invention can enhance the safety of the mixture, and has the advantages of proper heat engineering parameters and favorable cycle performance.

The invention relates to a mixed refrigerant containing iodotrifluoromethane. The mixed refrigerant is composed of a component 1, a component 2 and a component 3 which are physically mixed, wherein the component 1 is the iodotrifluoromethane with the function of fire and explosion suppression; the component 2 is 1,1,1,2-tetrafluoroethane; and the component 3 is propane; in the mixed refrigerant, the content of the component 1 is 1-10wt%, the content of the component 2 is 20-40wt%, and the content of the component 3 is 50-75wt%. The mixed refrigerant disclosed by the invention has the advantages that the ODP (Ozone Depletion Potential) value is zero, the GWP (Global Warming Potential) value is far lower than that of the conventional HFCs (Hydrofluorocarbon) working media, the lubricating oil intersolubility is favorable, and the mixed refrigerant can directly replace the R22 working medium without doing big changes for the refrigerating system; the because the components comprise the fire suppression component, the flammability of the mixed refrigerant is greatly lowered and is even lowered to be zero, and the safety of a refrigerating system is greatly enhanced.

The invention discloses a halogenated hydrocarbon combined solvent containing octafluoropentyl olefin ether. The halogenated hydrocarbon combined solvent is characterized by being prepared from trans-1,2-dichloroethylene, octafluoropentyl olefin ether, 1,1,2,3,3,3-hexafluoropropyl 2,2,2-trifluoroethyl ether and a stabilizer according to the weight ratio of (0.1-98):(0.1-30):(0.1-98):(0.1-3). The combined solvent is mixed with an alcohol according to a volume ratio of 1:(0.001-0.05) to be used as a cleaning agent of electronic components and scaling powder, or is mixed with a propellant according to a volume ratio of 1:(0.1-0.3) in a spraying tank to be used as a cleaning agent for precise machining parts. Compared with the prior art, the combined solvent has relatively high cleaning and dissolving capacity and degreasing and decontaminating capability, and especially meets the surface decontamination and cleaning requirements of electronic components and machine processing parts. The raw materials are non-toxic, harmless and non-corrosive, the preparation process is simple, the environment is not polluted, production cost is low, and therefore the combined solvent is a high-efficiency cleaning agent with a high industrial application value.

A HFC-227ea-containing mixed refrigerant for an organic Rankine cycle system comprises six compositions, and the six compositions are HFC-227ea, R290, HFC-236ea, HFC-245ca, R601 and R601a, and the mixed refrigerant specifically comprises the following combinations according to corresponding mass ratio: R227ea/R245ca (5-95/95-5%); R227ea/R236ea/R245ca (5-95/2-80/3-93%); and R227ea/R245ca/R601 (5-90/5-90/5-80%). The mixed refrigerant is capable of improving the safety of a mixture added with the mixed refrigerant, and is appropriate in thermal engineering parameters and excellent in cycle performance.

The invention discloses a CO2 compressive liquidation adjustable compound system based on recovery of internal energy of a power plant, and belongs to the technical field of energy and environments. The system comprises a three-way valve, liquid separating tanks, diverters, an expander, heat exchangers, compressor interstage heat exchangers, multiple stages of CO2 compressors, compressors, a condenser, mixers, a cold side evaporator, throttle valves, a generator set and CO2 booster pumps. The system comprises an adjustable CO2 compressive liquidation unit and an internal energy integrated system. Waste heat in multiple varieties and at multiple temperature levels is integrally used section by section at multiple stages, the CO2 flow is dynamically adjusted, a good effect is achieved for extracting at different temperature levels and coping with the generating capacity fluctuation, the system is highly integrated, nonreversible losses generated in the heat exchange process are reduced,the energy consumption of the system is obviously reduced, the energy utilization rate is remarkably increased, and the system can be widely applied to the field of carbon trapping and compressing.

The invention relates to a high-temperature heat pump mixed working medium. In a first scheme, the mixed working medium comprises the composition in the percentage by weight: 50-90% of HCFC-124 (chloride-1,2,2,2-tetrafluoroethane) and 10-50% of HCFC-142b (chloride-1,1-difluoroethane). The high-temperature heat pump mixed working medium of the invention is friendly to environment, has favourable thermal performance, can satisfy the using requirements of medium-high temperature heat pump systems of which the condensing temperature is 70-105 DEG C.

The invention provides a preparation method of 2, 3, 3, 3-tetrafloropropylene. The method comprises the following steps: with monochlorodifluoromethane and monochloro methane which are in a molar ratio of (0.5-4):1 as reaction raw materials, preheating the reaction raw materials, then mixing with superheated steam, wherein the volume ratio of the superheated steam to the reaction raw materials is (1-20):1, the temperature of the superheated steam is 900-1100 DEG C, the temperature in the reaction section is 600-1100 DEG C, and the stay time of reactants in the reaction section is 0.01-1s; and quenching, deacidifying, drying and rectifying and separating the product mixed flow to obtain 2, 3, 3, 3-tetrafloropropylene. The method provided by the invention overcomes the deficiency that a hollow tube is prone to carbonization in pyrolysis and side reactions are complex, the equipment maintenance rate is reduced, and meanwhile, the reaction period is prolonged, and the utilization ratio of the device is improved. The method provided by the invention has the characteristics of use of easily available raw materials, simple reaction process and the like. The obtained 2, 3, 3, 3-tetrafloropropylene has the advantages of zero ODP (Ozone Depletion Potential) and low GWP (Global Warming Potential), and is used as a substituent of automotive air conditionor refrigerant.