76 results about "Isopentane" patented technology

The invention relates to an adjustable multi-stage heat exchange injection type mixed working medium high-temperature heat pump system, and belongs to the technical field of high-temperature heat pump systems. The mixed working medium high-temperature heat pump system comprises a mixed working medium heat pump circulation loop and a gas-liquid jet type water supply loop. The mixed working medium heat pump circulation loop comprises a low-pressure compressor, a high-pressure compressor, working medium sides of four condensers, working medium sides of three evaporators and two two-phase ejectors, the working medium sides of the four condensers, the working medium sides of the three evaporators and the two two-phase ejectors are connected in series through two gas-liquid separators, and a working medium is a mixed working medium composed of cis-1, 3, 3, 3-tetrafluoropropene and isopentane. And the gas-liquid injection type water supply loop comprises a gas-liquid injector, a water pump and water sides of the three condensers. And the mixed working medium heat pump circulation loop and the gas-liquid jet type water supply loop are mutually coupled. The two gas-liquid separators are adopted to form four-stage condensation heat exchange, so that the energy utilization efficiency can be effectively improved, and the irreversible loss in the condensation process is reduced by at least 5%; evaporator evaporation of three different pressure levels is formed through boosting of the two two-phase ejectors, and irreversible loss in the evaporation process is reduced by at least 55%.

The invention belongs to the technical field of alkane processing, and particularly relates to a process for preparing isopentene by dehydrogenation of isopentane, a catalyst and a tert-amyl alcohol preparation process. The process for preparing isopentene by dehydrogenation of isopentane comprises an isopentane dehydrogenation device and an isopentene separation device, in the isopentane dehydrogenation device, a dehydrogenation reactor is a fixed bed adiabatic reactor and is filled with a Pt-Sn-K / alumina type alkane dehydrogenation catalyst, the catalyst has hydromethanation performance under the CO2-containing dehydrogenation reaction condition, and the arrangement and operation of a dehydrogenation reactor group comprise a mode A, a mode B or a mode C; the isopentene separation device comprises a cooling separation system, a pressure swing adsorption separation system and an optional rectification system. The tert-amyl alcohol is further prepared from isoamylene under the conditions of a fixed bed hydration reactor, ethylene glycol monobutyl ether and other solvents, and the tert-amyl alcohol product is obtained through separation. The process is superior to the prior art on the whole, and has certain application prospects.

The invention discloses a composite molecular sieve catalyst as well as a preparation method and application thereof. The composite molecular sieve catalyst is formed by compounding an ordered mesoporous molecular sieve and a modified USY molecular sieve catalyst in a mass ratio of 1: (1-5), the modified USY molecular sieve catalyst is obtained by treating a USY molecular sieve with an inorganic solution and roasting; the inorganic solution is one of ammonium chloride, ammonium fluoride and hydrofluoric acid. According to the method, the composite molecular sieve of the ordered mesoporous molecular sieve and the inorganic matter modified USY molecular sieve is used as the catalyst for removing the trace olefin in the isopentane oil, so that the trace olefin in the isopentane oil can be deeply removed, and the quality of the isopentane oil is improved; and the composite molecular sieve catalyst has good adsorption performance and small loss of isopentane.

The utility model relates to the technical field of petrochemical engineering, and particularly discloses a cracking tail oil heat recovery system of a slurry bed residual oil hydrogenation device, which comprises a fractionating tower, a fractionating tower bottom pump, an aviation kerosene tower bottom heat exchanger, a debutanizer bottom heat exchanger, an isopentane tower bottom heat exchanger and a tail oil cold feed preheater, the fractionating tower bottom pump, the aviation kerosene tower bottom heat exchanger, the debutanizer bottom heat exchanger, the isopentane tower bottom heat exchanger and the tail oil cold feed preheater are sequentially arranged on the fractionating tower, and a tail oil discharge pipeline is arranged on the tail oil cold feed preheater. The tail oil temperature of the cracking device is reasonably utilized, the heat exchange process is optimized, efficient recovery of tail oil heat is achieved, the potential safety hazard of leakage of a heat exchange system of the isopentane tower is eliminated, temporary shutdown overhaul of the device caused by leakage of a heat exchanger is avoided, meanwhile, effective and stable control over the tail oil temperature is achieved, and the service life of the device is prolonged. The operation cost of tail oil air cooling is saved, and safe and stable operation of a heat exchange system of the device is effectively guaranteed.

This invention discloses a method for the efficient conversion of isoparaffins, comprising the following steps: contacting a raw material containing isoparaffins and hydrogen with a catalyst in a reactor, reacting to obtain a product containing small molecule alkanes; wherein the isoparaffins are selected from at least one of isobutane, isopentane, neopentane, isohexane, and 3-methylpentane; wherein the small molecule alkanes are selected from at least one of ethane, propane, and n-butane; the catalyst is obtained by the following steps: mixing a metal acidic functional component, a metal basic functional component, a matrix precursor, a phosphorus auxiliary component precursor, a molding aid, and water, kneading, molding, and vacuum drying to obtain the catalyst.

A process using a liquid heat transfer fluid with a triple point temperature below -125°C, such as isopentane, to recover the cold energy from the sublimation and melting of frozen substances on heat exchanger surfaces, particularly CO2. The same heat transfer fluid circulates in two coupled circuits: one acting purely as a heat transfer fluid, the other as a heat transfer fluid during defrosting, and to transfer the cooling capacity recovered during defrosting. Figure 1

The application discloses a method for producing ethylene raw material. The method comprises the following steps: mixing hydrocracking light naphtha and hydrogen into a first hydroconversion reaction zone to react, and then the reaction effluent enters a separation system to obtain hydrogen-rich gas and a first hydroconversion product; the first hydroconversion product is separated to obtain ethane, propane, isobutane, isopentane and n-pentane; the isobutane is mixed with hydrogen into a second hydroconversion reaction zone, and the reaction effluent is separated to obtain n-butane; the second hydroconversion reaction zone is filled with a hydroconversion catalyst containing ZSM-35 molecular sieve; and the isopentane is recycled to the inlet of the first hydroconversion reaction zone. The first hydroconversion reaction zone is filled with a hydroconversion catalyst containing mordenite, and at least two catalyst beds are filled; and the active metal content of the hydroconversion catalyst decreases in turn along the flow direction. The method can effectively improve the proportion of normal alkanes in the product and improve the quality of the ethylene raw material.

Ethylene, alpha olefins, and other olefinically unsaturated monomers may be polymerized under fluidized bed polymerization reaction conditions in the presence of a Ziegler-Natta catalyst. A recycle stream featuring an induced condensing agent (ICA) comprising isobutane may increase catalyst productivity while maintaining quality of the polymer product, particularly when the recycle stream is delivered to a reactor containing the fluidized bed under conditions suitable to form a condensed or super-condensed mode in the recycle stream. The recycle stream may comprise unreacted olefinic monomers, and isobutane or a mixture of isobutane and isopentane.

The invention relates to the field of rigid polyurethane foam materials, and particularly provides a polyurethane cold storage plate composite material as well as a preparation method and application thereof, n-isopentane is matched and used according to a specific proportion, so that the problem of poor dimensional stability of a polyurethane foam material at a low temperature is solved, the foaming process is stable, foam pores are relatively small, and the cold storage plate composite material can be used for cold storage plates. And the formed foam structure is uniform and fine, and has good mechanical property and thermal insulation property. The insulation board is mainly used for cold storage insulation, refrigerator insulation, refrigerator car insulation and the like, and has the advantages of low heat conductivity coefficient, good mechanical property, light weight and the like.

The invention relates to the technical field of tail gas recovery, in particular to an isopentane tower tail gas recovery method, which comprises the following steps: exhaust gas from the top of an isopentane tower is discharged into an air cooler, and a part of air-cooled n-butane enters a top space position of a reflux tank through an air-cooled high-point non-condensable gas pipeline; the other part of the n-butane after air cooling is dissolved into the isopentane in the air cooling process, and is released through pressure reduction after entering the reflux tank, a part of the n-butane gas escapes from the isopentane, and a part of the isopentane gas is taken away while escaping and is mixed and polymerized with a non-condensable gaseous component at the top of the reflux tank; components at the top of the reflux tank enter the oil-gas separator, and are treated by the multi-stage demister and the multi-stage temperature change coil in the oil-gas separator, so that the n-butane in the tail gas of the isopentane tower can be effectively removed, and the separation and recovery of isopentane and n-butane oil gas can be quickly completed.

The invention discloses a method for deeply removing trace moisture in isopentane oil by using a composite molecular sieve, which comprises the following steps: under the conditions of temperature and pressure, enabling an isopentane oil raw material to flow through the composite molecular sieve to remove trace moisture in isopentane; the composite molecular sieve is formed by compounding and molding an ordered mesoporous molecular sieve and an A-type molecular sieve in a mass ratio of 1: (0.5-5). The isopentane oil is refined under the non-hydrogenation condition by adopting a multi-stage composite pore channel molecular sieve combination method, and the method has the advantages of simple process, low cost and convenience in operation, and can be used for industrial production of the isopentane foaming agent.

This application discloses a method for the conversion of C4-C6 alkanes. In a reactor, a raw material containing hydrogen and C4-C6 alkanes is contacted with a catalyst and reacted to obtain a product containing small molecule hydrocarbons; the C4-C6 alkanes are selected from at least one of n-butane, isobutane, n-pentane, isopentane, and 2,3-dimethylbutane; the small molecule hydrocarbons are selected from at least one of ethane, propane, n-butane, and n-pentane; the catalyst is prepared by the following steps: (1) mixing clay and sol, spray drying to obtain microspheres with a diameter of 1-50 μm; (2) immersing the microspheres in an aqueous solution containing a noble metal precursor, drying I, calcining I, and treating with a hydrogen atmosphere to obtain a catalyst precursor; (3) mixing the catalyst precursor, molecular sieve, and additives, rolling to form spheres, drying II, calcining II, and reducing to obtain the catalyst.

The embodiment of the invention provides a novel environment-friendly foaming agent and polyurethane formula, and the foaming agent comprises the following components in parts by weight: 0.5-8 parts of trifluoropropene and 13-20 parts of cyclopentane or cycloisopentane. The novel environment-friendly foaming agent provided by the embodiment of the invention has the characteristics of environment friendliness, low thermal conductivity, high strength and the like, and has good flowability and demolding property. In addition, the embodiment of the invention also provides a novel environment-friendly polyurethane formula and a preparation method thereof.

The application discloses a method for normalizing isomeric alkanes, which comprises the following steps: contacting isomeric alkanes and hydrogen with a catalyst in a reactor to obtain normal alkanes; the isomeric alkanes are selected from at least one of isobutane and isopentane; the catalyst is composed of an acidic carrier, a noble metal active component supported on the surface of the acidic carrier and an auxiliary element; the noble metal active component is selected from at least one of Pt and Pd; the auxiliary element is selected from at least one of Ce, Sn, La, Fe, Co, Ni and Cu; and the carrier is selected from at least one of molecular sieve, Al2O3 modified SO4 2‑ -WO3-ZrO2; the mass ratio of the noble metal active component to the acidic carrier in the catalyst is 0.0001-0.01:1; and the mass ratio of the auxiliary element to the acidic carrier is 0.0001-0.008:1.

The present application relates to the technical field of aviation gasoline, and discloses unleaded aviation gasoline and a preparation method thereof.The unleaded aviation gasoline comprises: 75-85 wt% of polymethylbenzene, and 15-25 wt% of at least two of alkylate, a side line distillation component of an alkylate device, light naphtha and isopentane; wherein the motor octane number of the polymethylbenzene is not less than 108.The product quality index of the unleaded aviation gasoline meets the standard of the American Society for Testing and Materials, that is, the technical requirement of ASTM D7719-2018 high-aromatic unleaded aviation gasoline.The unleaded aviation gasoline has the characteristics of good component continuity, stable combustion and high motor octane number, and meets the high-standard use requirement of unleaded and high-octane aviation gasoline.

A fiber-reinforced lithium borohydride-based all-solid-state electrolyte for suppressing dendrite formation, its preparation method, and its application are disclosed. The method employs a reverse micelle precipitation method to prepare a precursor solution by dissolving lithium borohydride and lithium iodide in an ether solvent solution. Aluminum oxalate and vapor-grown carbon fibers are then added, followed by dropwise addition to an isopentane solution containing a surfactant. After reverse micelles form, the solution is allowed to settle and react completely, and the solvent is thoroughly removed. The product from the settled reaction is dried and then subjected to partial hydrogen release treatment. The partially hydrogen-released product is dispersed in a benzene solution containing polymethyl methacrylate, freeze-dried, and then melt-reacted in situ in a universal mold. This process is simple and highly controllable, significantly improving the mechanical stability and dendrite resistance of the lithium borohydride-based all-solid-state electrolyte, and enabling long lifespan of all-solid-state lithium batteries under fast-charging conditions, thus facilitating commercial applications.

The application relates to an energy-saving and environment-friendly mixed working medium and application of the mixed working medium as a heat pump working medium, and belongs to the technical field of refrigerants. The mixed working medium is a ternary mixed working medium composed of three components of acetone, pentane (R601) and isopentane (R601a); and the mass percentage concentration of each component in the mixed working medium is as follows: the mass percentage of acetone is 37% to 64%, the mass percentage of pentane (R601) is 0.5% to 62.5%, and the mass percentage of isopentane (R601a) is 0.5% to 59.5%. The ternary mixed working medium obtained by controlling the detailed components constituting the working medium and the mass percentage of each component can especially obtain a heating temperature of 170 DEG C and above, and can be applied as a superhigh-temperature (temperature of 170 DEG C and above) heat pump working medium.

Alcohol based unleaded automotive racing fuels, using blends of four basic chemical components, including ethanol, methanol, toluene, and isopentane and / or cyclopentane. Mixtures provide increased power, and better charge cooling than conventional racing gasolines, whether leaded or unleaded. The claimed racing fuel blends do not include gasoline, isooctane, or alkylate fractions common to alcohol-gasoline mixtures such as E85 alcohol based fuels. The novel fuel blends claimed can be manufactured from commonly available pure chemical components, and make possible distributed manufacture of automotive racing fuels.

The invention relates to the technical field of high polymer material preparation, in particular to a polyethylene gas phase polymerization method and system.The method comprises the steps that triethyl aluminum, tri-n-hexyl aluminum, diethyl aluminum monochloride and a slurry catalyst are conveyed into a pre-contact mixer to be mixed; carrying out isopentane refining treatment on isopentane, and carrying out ethylene refining treatment on ethylene; performing initial polymerization reaction on the first high-purity ethylene and the first mixed catalyst in a small loop reactor to obtain small-particle-size polyethylene particles and a second mixed catalyst; and carrying out refining treatment on the 1-butene / 1-hexene, and carrying out polymerization reaction on the small-particle-size polyethylene particles and the 1-butene / 1-hexene in a gas-phase polymerization reactor by taking hydrogen as a molecular weight regulator under the action of a second mixed catalyst to obtain the target polyethylene resin. According to the method provided by the invention, based on the small loop reactor and the gas-phase polymerization reactor which are sequentially connected in series, a polyethylene pelletizing product with high strength, high impact resistance and high rigidity can be obtained.

The invention discloses a method for separating electronic-grade tetramethylsilane and application. The method comprises the following steps: obtaining a raw material gas crude product after dehydrogenation and heavy component removal; the raw material gas crude product is sequentially subjected to adsorption purification through a polar adsorption part and a volume adsorption part, the polar adsorption part at least comprises a polar adsorbent, the volume adsorption part at least comprises a porous adsorbent, and the polar adsorbent is selected to have selective polar adsorption on 2-chloropropane; the porous adsorbent is selected to have selective volume adsorption on isopentane. According to the invention, two types of molecular sieve adsorbents are combined for use, so that the common problem of high energy consumption of purification by connecting multiple rectifying towers in series in organic silicon production is solved, and the content of isopentane is directly reduced to be less than 10ppm; the experimental conditions are not harsh, the energy consumption is low, the molecular sieve can be regenerated and reused, and the economical efficiency is high.

The application discloses a method for preparing high-quality cracking material, which comprises the following steps: contacting C5 alkanes and hydrogen with a catalyst in a reactor, and reacting to obtain high-quality cracking material; the C5 alkanes are at least one selected from normal pentane and isopentane; the high-quality cracking material is at least one selected from ethane, propane, normal butane and normal pentane; the catalyst is composed of an acidic carrier and a noble metal active element and an auxiliary element supported on the surface of the acidic carrier; the noble metal active element is at least one selected from palladium and platinum; the auxiliary element is at least one selected from potassium and iron; in the catalyst, the mass ratio of the noble metal active element to the acidic carrier is 0.0001-0.005:1, and the mass ratio of the auxiliary element to the acidic carrier is 0.002-0.05:1.

The application discloses rigid polyurethane foam, a preparation method and a refrigeration appliance, comprising: a combined polyether; isocyanate; foaming agent I, the foaming agent I is one of cyclopentane and isopentane or a mixture composed of cyclopentane and isopentane in any proportion; foaming agent II, the foaming agent II is one of pentafluoropropane and trifluoro-chloro-propylene or a mixture composed of pentafluoropropane and trifluoro-chloro-propylene in any proportion; and foaming agent III, the foaming agent III adopts perfluoromethyl vinyl ether. By adding perfluoromethyl vinyl ether as a foaming agent, the application overcomes the foam cavity problem of a low-boiling-point foaming system, reduces the foam molding density, improves the supporting capacity of low-density rigid polyurethane foam, and has low cost and high practicability.

The present invention discloses a method for recovering normal butane in isooctane oil as a raw material for producing maleic anhydride, comprising: the product after alkylation reaction enters a debutanizer for separation, the upper section of the debutanizer extracts mixed butane and enters a butane separation tower for separation by increasing the operating temperature of the debutanizer bottom, and the lower section of the butane separation tower extracts normal butane and sends it to a maleic anhydride reaction device; a part of the isobutane extracted from the top of the butane separation tower is returned to the alkylation reactor, and the other part is mixed with the isooctane product extracted from the bottom of the debutanizer; the isopentane extracted from the bottom of the butane separation tower is mixed with the isooctane product extracted from the bottom of the debutanizer. The present invention significantly reduces the production cost of the maleic anhydride process by recovering normal butane in the isooctane product of the alkylation process as a raw material for the maleic anhydride process; and by blending the surplus isobutane C4 and isopentane C5 in the maleic anhydride process raw materials into the isooctane product, the quality and yield of the isooctane product after the normal butane is extracted are guaranteed.

The invention relates to the field of fuel oil, and discloses a method for preparing lead-free gasoline, which comprises the following steps: distilling alkylated gasoline, taking a distillation product with a distillation range of 35-138 DEG C as cutting oil, and mixing 55-83 wt% of cutting oil, 3-14 wt% of isopentane, 3-15 wt% of C6-C10 aromatic hydrocarbon and an additive, the additive contains 10 to 20 weight percent of carbonic ester and 105 to 300 mg Mn / kg of carbonyl manganese. The key indexes of the lead-free gasoline provided by the invention meet the specification requirements of 100VLL in ASTM910 and 100LL high-grade aviation gasoline in GB1787, and meanwhile, the lead-free gasoline does not contain lead compounds, is low in aromatic amine and aromatic hydrocarbon content, and has lower toxic influence on the environment. In addition, the preparation process of the lead-free gasoline is simple, easy to operate and low in cost, and has industrial application prospects and remarkable economic and social benefits.

The invention provides a method for determining the content of methanol and ethanol in isopentane. The method comprises the following steps: adding starch and chloride into water, boiling, standing, freezing, transferring isopentane and an aqueous solution containing starch and chloride, extracting, filtering, and detecting the content of methanol and ethanol by chromatographic analysis. According to the determination method, an extraction method is utilized, water is taken as an extraction solution, isopentane is taken as an extracted solution, methanol and ethanol in the isopentane are absorbed by the extraction solution and are retained in the water, and water is used for sampling, so that a sample can be normally sucked into a microinjection needle, and the contents of methanol and ethanol in the isopentane can be accurately quantified.

The invention discloses a high-performance metallocene floor heating pipe polyethylene resin and a preparation method thereof, the high-performance metallocene floor heating pipe polyethylene resin comprises the following components by mass: 100 parts of polyethylene powder, 0.2-0.4 part of a composite antioxidant, 0.01-0.02 part of a high-activity metallocene catalyst, ethylene as a main raw material, hydrogen as a chain terminator, hexene-1 as a comonomer, and isopentane as an induced condensing agent. The preparation method comprises the following steps: adding polyethylene powder and a compounding agent into a reactor through a material feeding line, metering the polyethylene powder and the compounding agent according to a certain ratio, fully mixing, and extruding and granulating through a twin-screw extruder, thereby realizing the efficient and stable production of metallocene polyethylene resin products, creating greater economic benefits for enterprises, meeting the requirements of market product processing users, and having wide application prospects. Provided is a metallocene material having excellent thermal conductivity and heat resistance required for manufacturing a floor heating pipe.

The application discloses a method for preparing normal paraffin, comprising the following steps: contacting isomeric alkanes and hydrogen with a catalyst in a reactor, and reacting to obtain normal paraffin; the isomeric alkanes are selected from at least one of isobutane and isopentane; the catalyst is composed of a double-layer spherical carrier and a noble metal active component loaded on the surface of the double-layer spherical carrier; and the noble metal active component is selected from at least one of platinum, palladium and gold.

The embodiment of the invention provides a novel environment-friendly foaming agent and polyurethane formula, and the foaming agent comprises the following components in parts by weight: 0.5-8 parts of propane and 13-20 parts of cyclopentane or cycloisopentane. The novel environment-friendly foaming agent provided by the embodiment of the invention has the characteristics of environment friendliness, low thermal conductivity, high strength and the like, and has good flowability and demolding property. In addition, the embodiment of the invention also provides a novel environment-friendly polyurethane formula and a preparation method thereof.

The present invention belongs to the field of high-end carbon materials in petrochemical industry, and specifically relates to a method for preparing high-end carbon material raw materials by supercritical extraction of oil slurry, and the specific preparation steps are: S1, the oil slurry is evenly mixed with a diluting solvent, and extracted in countercurrent contact with a main solvent in an asphalt extraction tower to obtain a by-product asphalt; S2, the raffinate phase is further extracted in an aromatic oil extraction tower to obtain aromatic oil; S3, the raffinate phase is further extracted in a supercritical light de-oiling tower to obtain a by-product alkane oil. In the extraction process of the present invention, isopentane is selected as an extraction solvent, and the extraction tower temperature and pressure are accurately controlled, and impurities such as asphaltene and ash in the asphalt are effectively stripped off, and 3-5-ring aromatics in the asphalt are extracted into aromatic oil, so that the asphalt yield is reduced to 6%-9%, and the yield of light and heavy oil is effectively improved. The needle coke obtained by the method of the present invention to obtain aromatic oil can reach the standard of Water Island X-grade coke.

The invention relates to the technical field of fuel, in particular to high-cold-environment spark-ignition engine test standard oil and a preparation method thereof, and the high-cold-environment spark-ignition engine test standard oil comprises the following main components: a high-boiling-point aromatic hydrocarbon solvent SA1500, a high-boiling-point aromatic hydrocarbon solvent SA1000, alkylated oil, heavy naphtha, toluene, xylene, 1-octene, isopentene and isopentane. By virtue of the quality characteristics of high vapor pressure and highly stable index, the standard oil remarkably enhances the low-temperature volatile performance of fuel oil, ensures that an engine realizes rapid ignition and stable combustion in an extremely cold environment, provides reliable fuel guarantee for a high and cold test, and assists the performance optimization and technical breakthrough of the engine.