937 results about "Isobutane" patented technology

A process for the production of a high quality gasoline blending components from refinery process streams by the alkylation of light isoparaffins with olefins using an ionic liquid catalyst is disclosed. The process includes reacting a refinery stream containing isopentane and/or isobutane with a refinery stream containing ethylene and/or propylene and butylenes under alkylation conditions in the presence of a chloroaluminate ionic liquid catalyst comprising a hydrocarbyl substituted pyridinium halide or a hydrocarbyl substituted imidazolium halide of the general formulas A and B, respectively.

Where R=H, methyl, ethyl, propyl, butyl, pentyl or hexyl group and X is a halide and preferably a chloride, and R1 and R2=H, methyl, ethyl, propyl, butyl, pentyl or hexyl group and where R1 and R2 may or may not be the same.

The invention discloses a hydrogenation method for liquefied gas fraction, which is characterized by comprising the following steps of: filling at least one section of catalyst bed layer into a reactor, introducing a liquefied gas fraction raw material and hydrogen into the reactor from one or more sections of catalyst bed layers to contact a catalyst and perform hydrogenation saturation reaction, and reacting olefin in the liquefied gas fraction and the hydrogen to generate alkane and release a large amount of heat; after heat exchange, feeding the reaction product into a gas-liquid separator and separating the reaction product into a gas phase and a liquid phase, and introducing the separated gas phase flow into the reactor to perform repeated use; and introducing a part of separated liquid phase flow serving as a cyclic reaction product back to the reactor, and introducing the other part of the separated liquid phase flow serving as a liquefied gas fraction hydrogenation product out of the reactor to perform reuse. The hydrogenation product obtained by the method is saturated light hydrocarbon fraction which can be directly used as a raw material for an ethylene cracking device and also can be fractionated and cut into propane, n-butane and iso-butane and the like serving as high value-added chemical base raw materials so as to increase the economic benefit of an oil refining enterprise.

Azeotropic or azeotrope-like compositions are disclosed. The azeotropic or azeotrope-like compositions are mixtures of E-1,1,1,4,4,4-hexafluoro-2-butene with methyl formate, n-pentane, 2-methylbutane trans-1,2-dichloroethylene, 1,1,1,3,3-pentafluoropropane, n-butane or isobutane. Also disclosed is a process of preparing a thermoplastic or thermoset foam by using such azeotropic or azeotrope-like compositions as blowing agents. Also disclosed is a process of producing refrigeration by using such azeotropic or azeotrope-like compositions. Also disclosed is a process of using such azeotropic or azeotrope-like compositions as solvents. Also disclosed is a process of producing an aerosol product by using such azeotropic or azeotrope-like compositions. Also disclosed is a process of using such azeotropic or azeotrope-like compositions as heat transfer media. Also disclosed is a process of extinguishing or suppressing a fire by using such azeotropic or azeotrope-like compositions. Also disclosed is a process of using such azeotropic or azeotrope-like compositions as dielectrics.

The invention discloses a catalyst for preparing isobutene through dehydrogenation of iso-butane and a preparation method thereof. The catalyst is prepared by the following steps of: co-dipping a carrier mesoporous alumina based molecular sieve of which the skeleton contains tin and a carrier modifier basic metal aid in a mixed aqueous solution of HaPtCl6 and SnCl4; and performing drying and reducing activation, wherein the basic metal is one or a mixture of several of IV and IIA elements and rare earth metals; based on the mesoporous alumina based molecular sieve, the skeleton tin metal accounts for 0.01 to 20 weight percent of the carrier; based on the mesoporous alumina based molecular sieve of which the skeleton contains tin, the active metal platinum accounts for 0.01 to 10 weight percent of the carrier, the aid metal tin accounts for 0.01 to 10 weight percent of the carrier and the aid basic metal accounts for 0.01 to 5 weight percent of the carrier. The catalyst has high iso-butane conversion rate, isobutene selectivity and reaction stability under the conditions of high temperature and low pressure.

The invention provides a method for preparing isobutylene by comprehensively using mixed C4 and mainly solves the problems of low overall utilization efficiency and low additional value of the mixed C4 byproduct of a refinery or a steam cracking device. An aim is fulfilled by adopting a technical scheme which comprises the following steps of: (1) selectively hydrogenating to remove butadiene in the mixed C4; (2) isomerizing butylenes-1 in the mixed C4 obtained in the first step into butylenes-2 by using catalytic distillation technology, and simultaneously dividing the mixed C4 into two strands of materials, namely the first material comprising isobutylene and iso-butane, and the second material comprising n-butane and butylenes-2; (3) separating the first material through an etherifying device to obtain high-purity isobutylene and high-concentration iso-butane; (4) dehydrogenating the iso-butane to obtain the high-purity isobutylene; and (5) isomerizing the butylenes-2 of the second material into the isobutylene by using isomerizing technology, and simultaneously separating to obtain higher-purity n-butane. The method can be applied to the industrial field of producing the high-purity isobutylene.

The invention provides an iso-butane, n-butane and butylene separation and purification method. C4 raw materials are successively put into a C3 decarburization tower, a C5 decarburization tower, an iso-butane tower, an n-butane tower and a stripping tower to obtain high-purity iso-butane, n-butane and butylene. Solvents are cyclically utilized. The iso-butane, n-butane and butylene separation and purification method has the technical advantages that not only can equipment investment be reduced, but also the advantages of extractive distillation are used and the energy consumption is reduced.

The invention discloses a detection method of a phthalate plasticizer, comprising the following steps: 1. pretreatment: putting a sample to be detected into an organic solvent, and then dissolving and treating to obtain the solution to be detected in which the plasticizer is dissolved; and 2. content determination of the plasticizer: utilizing a gas chromatogram method and a chemical ionization mass spectrometry method to detect the type and the content of the plasticizer in the detected solution, wherein, the chemical ionization reagent used in the chemical ionization mass spectrometry method is composed of isobutane, methane or ammonia. The detection method of the phthalate plasticizer provided by the invention has high qualitative and quantitative accuracy and high quantitative detection sensitivity.

A process for the alkylation of alkane with olefin or olefin precursor such as an oligomer of tertiary olefin comprising contacting a liquid system comprising acid catalyst, isoparaffin and olefin in concurrent downflow into contact in a reaction zone with a disperser mesh under conditions of temperature and pressure to react said isoparaffin and said olefin to produce an alkylate product is disclosed. Preferably, the liquid system is maintained at about its boiling point in the reaction zone. Unexpectedly, the olefin oligomers have been found to function as olefin precursors and not as olefins in the reaction. Thus, for example, a cold acid alkylation using an oligomer of isobutene (principally dimer and trimer) with isobutane produces isooctane with the isobutane reacting with the constituent isobutene units of the oligomers on a molar basis. The product isooctane is essentially the same as that produced in the conventional cold acid process.

Disclosed herein is a method of operating a polymerization reactor for a polymerization reaction comprising modifying a recycle gas composition to increase the heat capacity of the recycle gas wherein the recycle gas composition is modified by reducing or eliminating the nitrogen concentration in the recycle gas. In an embodiment, the nitrogen concentration is reduced or eliminated by reducing or eliminating one or more nitrogen input sources to the polymerization reactor and replacing the nitrogen with an alternate inert fluid (a gas or liquid that is inert to the catalyst and reactants). The alternate inert fluid has a higher heat capacity and a higher molecular weight than nitrogen. In an embodiment, the nitrogen utilized to convey a catalyst into the polymerization reactor is replaced with an alternate inert fluid. In an embodiment, the alternate inert fluid is ethane, propane, isobutane, or combinations thereof.

Process for producing acrylonitrile or methacrylonitrile from propane or isobutane by ammoxidation at a temperature in the range of from 380 to 500 DEG C. in a fluidized-bed reactor containing a catalyst composition preheated to a temperature of not lower than 300 DEG C. and lower than the ammoxidation reaction temperature, the catalyst composition comprising a carrier having supported thereon an oxide catalyst comprising a compound oxide of molybdenum, vanadium, niobium and at least one element selected from tellurium and antimony, wherein the ammoxidation of propane or isobutane is preceded by a specific temperature elevation operation in which the catalyst temperature in the reactor is elevated, while supplying into the fluidized-bed reactor a molecular oxygen-containing gas together with a combustible gas capable of combustion by reaction with the molecular oxygen in the presence of said catalyst composition, until the temperature of the catalyst composition reaches said ammoxidation reaction temperature. The process of the present invention is advantageous in that the temperature elevation of the catalyst can be performed without suffering a deterioration of the catalytic activity during the temperature elevation, thereby allowing the catalyst to fully exhibit its performance.

A method and system of refining natural gas that improves the quality of liquefied natural gas and enables separation and recovery of hydrocarbons other than methane. The method of refining natural gas containing methane; any other hydrocarbon selected from the group consisting of ethane, ethylene, propane, propylene, n-butane, isobutane, 1-butene, n-pentane, and isopentane; carbon dioxide; and hydrogen sulfide, includes adjusting a pressure and temperature of the natural gas so that the methane is in the gas phase, the other hydrocarbon in the liquid phase, and the carbon dioxide and the hydrogen sulfide in the solid phase, respectively; separating the natural gas, of which the pressure and temperature has been adjusted, into a gas containing the methane and a suspension liquid; and separating the separated suspension liquid into a liquid containing the other hydrocarbon and a solid containing the carbon dioxide and the hydrogen sulfide.

Low-value mixed butanes are processed to obtain a high yield of high-purity para-xylene. Processing steps may comprise fractionation to recover isobutane, dehydrogenation of the isobutane to isobutene, dimerization of the isobutene to obtain C₈ iso-olefins and isoparaffins, aromatization of the dimerized C₈ product, and recovery of high-purity para-xylene from the dimerized product by low-intensity crystallization. The availability of isobutane may be increased by isomerization of normal butane. Each of the processing steps may be tailored to the overall objective of high para-xylene yield from a relatively inexpensive feedstock.

The invention relates to a carrier of a platinum catalyst for light alkane dehydrogenation and a use thereof. The carrier mainly solves the problem that the existing catalyst has poor wear resistance and the precious metal is easy to lose along with the carrier wear during the use. A preparation method of the platinum catalyst comprises coating the surface of a magnesium aluminate carrier with alumina or pseudo-boehmite sol through a spraying or rolling method to obtain an alumina housing, carrying out drying and high temperature calcination to obtain a compound metal oxide carrier having the inert housing, loading platinum and tin components through an impregnation method through impregnation of a soluble salt aqueous solution of platinum, and carrying out drying, roasting and vapor treatment to obtain the platinum catalyst. Propane/isobutane as a raw material contacts with the catalyst and undergoes a reaction under conditions of a reaction temperature of 520 to 620 DEG C, reaction pressure of 0 to 0.4MPa, an alkane mass space velocity of 0.1 to 8.0h<-1> and a H2O/CnH2n+2 volume ratio of 1 to 18 to produce propylene/isobutene so that the problem is solved. The platinum catalyst carrier can be used in industrial preparation of a catalyst for light alkane dehydrogenation preparation of a light olefin.