68 results about "Octafluorocyclobutane" patented technology

To provide a purification adsorbent capable of effectively removing impurities contained in a perfluorocarbon and obtaining a perfluorocarbon reduced in the impurity content to 1 ppm by mass or less; a process for producing the adsorbent; high-purity octafluoropropane or octafluorocyclobutane; processes for purifying and for producing the octafluoropropane or octafluorocyclobutane; and uses thereof. Purification is performed using a purification adsorbent produced by a method comprising (1) washing an original coal with an acid and then with water, (2) deoxidizing and/or dehydrating the original coal, (3) re-carbonizing the original coal at a temperature of from 500 to 700° C. and (4) activating the original coal at a temperature of from 700 to 900° C. in a mixed gas stream containing an inert gas, carbon dioxide and water vapor.

The production method of hexafluoropropylene includes the following steps: uniformly mixing raw material gas tetrafluoroethylene and octafluorocyclobutane according to a certain proportion, preheating and feeding them into stage heated tubular reactor for making cracking reaction, quenching reaction product, removing acid, drying and finally rectifying separation to obtain the invented hexafluoropylene whose purity is greater than or equal to 99.98%. Said invention adopts the octafluorocyclobutane as diluting agent and as reactant, at the same time adopts stage heated cracking process, so that it not only improves the thermal conductivity of cracking gas, but also can make the whole reaction process be implemented in optimum temp. range to inhibite the production of poor side reaction.

A novel refrigerant composition useful as a substitute for HCFC-22, comprising a first constituent of difluoromethane (CH2F2, HFC-32); a second constituent of pentafluoroethane (CHF2CF3, HFC-125); a third constituent of 1,1,1-trifluoroethane (CH3CF3, HFC-143a); a fourth constituent selected from the group consisting of cyclopropane (C3H6, RC-270), 1,1,1,2,3,3,3-heptafluoropropane (CF3CHFCF3, HFC-227ea), 1,1,1,2,2-pentafluoropropane (CH3CF2CF3, HFC-245cb), isobutane (CH(CH3)2CH3, R-600a), octafluorocyclobutane (C4F8, RC-318), 1,1,1,2,3,3-hexafluoropropane (CHF2CHFCF3, HFC-236ea), butane (C4H10, R-600), bis(difluoromethyl)ether (CHF2OCHF2, HFE-134) and pentafluoroethylmethylether (CF3CF2OCH3, HFE-245).

Methods of etching silicon nitride material, and more particularly, etching nitride selective to silicon dioxide or silicide, are disclosed. The methods include exposing a substrate having silicon nitride thereon to a plasma including at least one fluorohydrocarbon and a non-carbon containing fluorine source such as sulfur hexafluoride (SF₆). The plasma may also include oxygen (O₂) and the fluorohydrocarbons may include at least one of: trifluoromethane (CHF₃), difluoromethane (CH₂F₂), and methyl fluoride (CH₃F). In an alternative embodiment, the plasma includes one of hydrogen (H₂) and nitrogen trifluoride (NF₃) and one of tetrafluoromethane (CF₄) and octafluorocyclobutane (C₄F₈). The methods are preferably carried out using a low bias voltage, e.g. <100 V.

Methods of etching a dielectric layer and a cap layer over a conductor to expose the conductor are disclosed. In one embodiment, the methods include the use of a silicon dioxide (SiO₂) etching chemistry including octafluorocyclobutane (C₄F₈) and a titanium nitride (TiN) etching chemistry including tetrafluoro methane (CF₄). The methods prevent etch rate degradation and exhibit reduced electro-static discharge (ESD) defects.

The present invention discloses one kind of multicomponent mixture work medium suitable for fractional condensation type heat pump circulation system. The mixture work medium or mixed refrigeratant consists of two components, including one low boiling point component and one high boiling point component. The low boiling point component is one or several selected from difluro methane, trifluoro ethane, fluoro ethane, propylene, propane, pentafluoro ethane, etc. The high boiling point component is one or several selected from isobutane, n-butane, butene, isobutene, octafluoro isobutene, octafluoro cyclobutane, etc.

The invention discloses a preparation method of trifluoroethylene, which comprises the following steps: mixing 1,1,1,2-tetrafluoroethane with octafluorocyclobutane according to the molar ratio of 1:1-9 under the action of a cracking catalyst for reaction, controlling the reaction temperature to be 350-550 DEG C, the reaction airspeed to be 500-2000 hours-1 and the reaction pressure to be normal pressure and obtaining the trifluoroethylene after cracking gas generated by reaction is quenched, washed, alkali-cleaned, dried, compressed, rectified and purified. The preparation method has the advantages of low reaction temperature, simplicity in separation and purification and low cost, the maximum conversion rate of the 1,1,1,2-tetrafluoroethane is 56.3 percent, and the maximum selectivity of the trifluoroethylene is 97.5 percent.

The invention relates to a method for synthesizing a fire extinguishing agent octafluorocyclobutane, and belongs to the field of organic chemical synthesis. The method for synthesizing octafluorocyclobutane is characterized in that the octafluorocyclobutane is generated from dichlorotetrafluorocyclobutene, hydrogen fluoride and chlorine gas in the presence of a fluorination catalyst. FORMULA is shown in the description. According to the method, raw materials are cheap, the raw material source is convenient, product separating and purifying is simple, industrial production is easy, and a littlethree industrial wastes (waste solid, waste water and waste gas) is generated.

The invention relates to a high-purity octafluorocyclobutane purification method, wherein the method comprises the following steps: step A, system cleaning: using nitrogen gas for purging a purification system, and after purging, vacuumizing the purification system; step B, low-boiling fraction removal and rectification; step C, high-boiling fraction removal and rectification; step D, finished production bottling: filling a preservation container with gas phase of a high-boiling fraction removal and rectification tower to obtain the finished product. The invention relates to a high-purity octafluorocyclobutane purification system including a primary adsorber, a low-boiling fraction removal and rectification tower, the high-boiling fraction removal and rectification tower, a membrane compressor, a first deep adsorber and a second deep adsorber. The high-purity octafluorocyclobutane purification method has simple and reliable process, and the finally obtained octafluorocyclobutane has high purity; the high-purity octafluorocyclobutane purification system has the advantages of simple structure, and has no need for large area reconstruction of conventional equipment.

The invention discloses a process for manufacturing a micro-lens array with a large numerical aperture, which comprises the following steps (a) manufacturing a zinc oxide nanometer column; (b) manufacturing an octafluorocyclobutane (C4F8) layer on the surface of the zinc oxide nanometer column; (c) manufacturing a micro-lens in a spray ink printing mode; and (d) curing the micro-lens and enabling the micro-lens array obtained in the step (b) to be cured through a mode of ultraviolet light source exposure and substrate heating. The method greatly reduces cost of the existing graphical technology, has potential of large-area manufacture simultaneously, and remarkably improves the numerical aperture of the micro-lens array. In addition, the spray ink printing is the process of natural dropping and forming of liquid drops, roughness of the surface of the manufactured lens is low, and errors including noises and the like can be removed when the lens is actually used.

The invention discloses a mixed gas insulating medium comprising the following components in percent by volume: 15-20 % of octafluorocyclobutane and 80-85% of nitrogen. The mixed gas insulating medium disclosed by the invention can serve as a new generation of gas insulating medium by replacing sulfur hexafluoride and can be widely applied to high-voltage power equipment, such as gas insulated transformers, gas insulated combined electrical appliances, gas insulated power transmission pipelines and the like.

An electrode-equipped substrate includes a substrate portion of synthetic resin and a transparent electrode. The electrode-equipped substrate is subjected to heat treatment at a temperature of 200° C. or less as well as plasma treatment before organic layers are deposited. The plasma treatment is carried out within atmosphere of (A) a mixed gas of oxygen and any one of nitrogen, argon, helium, neon and xenon, with an oxygen density of 5% or less; (B) a mixed gas of oxygen and any one of carbon tetrafluoride, hexafluoroethane, octafluoropropane and octafluorocyclobutane; or (C) a sole gas of nitrogen, argon, helium, neon, xenon, carbon monoxide, carbon dioxide, nitrogen monoxide or nitrous oxide.

The invention relates to a mixed gas insulating medium containing environmentally friendly gaseous trifluoroiodomethane and a preparation method of the mixed gas insulating medium. The components of the mixed gas insulating medium comprise a trifluoroiodomethane gas, an octafluorocyclobutane gas and a carbon dioxide gas. The preparation method includes a vacuuming step and a mixing step. The mixedgas insulating medium can well meet the use requirements of high-voltage power equipment such as gas insulated transformers, gas-insulated combined electrical appliances and gas-insulated transmission pipelines, and has the advantages of excellent insulation performance and high environmental protection performance.

The present disclosure related to azeotrope and near-azeotrope compositions comprising PFC-C318 and HFC-236cb. The present disclosure further relates to processes for removing PFC-C318 from HFC-236cb. And the present disclosure further relates to azeotrope and near azeotrope compositions comprising hydrogen fluoride and PFC-C318.

The invention relates to a jointly recycling method for a residual liquid in production of tetrafluoroethylene and hexafluoropropylene. According to the method, the residual liquid generated in production of tetrafluoroethylene is introduced to a production process of hexafluoropropylene and is rectified and recovered with the residual liquid generated in production of hexafluoropropylene to recover octafluorocyclobutane without independent equipment and process operations, so that octafluorocyclobutane in the tetrafluoro residual liquid can be recovered with a low cost. The recovered octafluorocyclobutane contains minute quantity of similar components. Being specially matched with a tetrafluoroethylene monomer, the quality of hexafluoropropylene is not affected, and the octafluorocyclobutane can be directly used for producing hexafluoropropylene, so that perfect fusion of the production process of hexafluoropropylene and the recovery process of the residual liquid is realized. Moreover, separation and recovery are more simplified and reliable.

The invention discloses a catalyst for catalytic conversion of impurities in octafluorocyclobutane, and a preparation method and an application thereof. The catalyst is composed of an active carbon loaded active component and auxiliary agents, the active component is palladium, the auxiliary agents are X1 and X2, the content of the active component palladium is 0.2-1.5 wt%, the content of the auxiliary agent X1 is 0.1-2.5 wt%, and the content of the auxiliary agent X2 is 0.05-0.8 wt%. The content of alkene-containing fluorocarbon impurities in octafluorocyclobutane can be reduced to 1 ppmv orbelow. The catalyst has the advantages of good performances, high separation efficiency and simplicity in operation.

The present invention is one kind of energy-saving environment-protecting zeotropic mixture refrigerant consists of chlorobifluoromethane 43.0-46.5 wt%, 1, 1-difluorethane 6.0-9.0 wt%, 1-chloro-1, 1- difluorethane 4.0-6.0 wt%, and octafluorocyclobutane 41.0-44.0 wt%. The refrigerant has obvious energy saving effect, excellent environment protecting performance and excellent comprehensive performance, and may be used as new generation of refrigerant to replace CFC widely used in various refrigerator, heat pump and air conditioner.

The invention discloses a thermal bulb of a thermal expansion valve, a filling method of the thermal bulb and a refrigerating system with the thermal bulb of the thermal expansion valve. The thermal expansion valve comprises a valve body component, a driving component and the thermal bulb, wherein the driving component is used for driving the valve body component, and the thermal bulb is filled with thermal working media. The thermal bulb is characterized in that the thermal working media comprise octafluorocyclobutane and non-condensable gas. The filling method of the thermal bulb includes the steps of A20, enabling a filling tube to be connected to a filling device, A40, starting a vacuum pump to vacuumize a cavity on a membrane, and then stopping the vacuum pump, A60, filling the thermal bulb with the octafluorocyclobutane and the non-condensable gas, and A80, carrying out sealing processing on the filling tube. After the thermal bulb and the filling method of the thermal bulb are used, fluctuations of static superheat degrees of the thermal expansion valve at different thermal bulb temperatures are quite small, and the refrigerating system with the thermal expansion valve is high in energy efficiency ratio.

The invention discloses an adsorbent for removing hexafluoropropylene in octafluorocyclobutane. The adsorbent comprises, by weight, 10-25% of iron oxide, 5-20% of copper oxide, 60-80% of tin oxide, 0.05-0.5% of gallium, 0.05-0.3% of platinum, 0.1-1.5% of cadmium and 0.1-3% of molybdenum. The invention further discloses a method for preparing the adsorbent. The method includes steps of (1), addingsalt solution of the iron oxide, the copper oxide and the tin oxide into a hydrothermal reactor and uniformly stirring the salt solution of the iron oxide, the copper oxide and the tin oxide; (2), adding salt solution of the gallium, the platinum, the cadmium and the molybdenum into the hydrothermal reactor and carrying out doping modification; (3), adding metal mesh packing into the hydrothermalreactor, placing the hydrothermal reactor with the added metal mesh packing into a drying oven and carrying out reaction on solution in the hydrothermal reactor at the hydrothermal treatment temperatures of 110-160 DEG C for 40-70 min. The adsorbent and the method have the advantage that the hexafluoropropylene in the octafluorocyclobutane can be effectively removed by the adsorbent.

The invention relates to a method for manufacturing a high-performance nano friction generator. The method comprises the steps as follows: 1), a friction material layer easy to obtain electrons is taken from a conventional nano friction generator; 2), initialization and plasma stabilization are performed on plasma equipment, so that plasmas glow and discharge; 3), technological parameters of the plasma equipment are regulated, octafluorocyclobutane is taken a reaction gas, and the surface of the friction material layer easy to obtain electrons is subjected to chemical modification; and 4), the modified friction material layer easy to obtain electrons is assembled back to the nano friction generator, so that the high-performance nano friction generator is obtained. The method for manufacturing the high-performance nano friction generator is simple in process, low in cost and high in yield, the high-performance nano friction generator can be produced in batches, the process compatibility is excellent, the method is not limited to device structures, materials and the like and can be widely applied in the conventional nano friction generator, and the output performance is improved.