575 results about "Hydrocarbon mixtures" patented technology

A medical device having a contact surface exposed repeatedly to bodily tissue is disclosed. The contact surface is coated with a silicone polymer and one or more non-silicone hydrophobic polymers. The preferred medical device is a surgical needle, and the preferred coating is a polydimethylsiloxane and polypropylene wax hydrocarbon mixture. The incorporation of the non-silicone hydrophobic polymer increases the durability of the coating on the device without sacrificing lubricity.

Methods and apparatus for analyzing a hydrocarbon mixture are disclosed, comprising at least one light-emitting diode (LED) and at least one photodetector positioned to detect energy transmitted by the LED through a sample of the hydrocarbon mixture. In at least one embodiment an optical filter is coupled to the output of the LED to mitigate the adverse effects of the LED's sensitivity to temperature.

A process for preparing ethylene and propylene from the hydrocarbon mixture containing C4 (or C5) olefine includes such steps as contacting the zeolite contained catalyst in fixed-bed reactor, reacting at 350-500 deg.C and 1-10 /hr of space speed under 0.6-1.0 MPa to obtain the mixture of ethylene and propylene, and cooling separating. Said catalyst contains Al2O3 or SiO2, high-Si zeolite and modifier.

Provided is a method of preparing a ZSM-5 catalyst for preparing light olefins including ethylene and propylene through a catalytic cracking of a hydrocarbon mixture of C4 to C7 produced after a naphtha cracking. The method includes (a) forming a gel by aging a mixture solution including a silica precursor and an aluminum precursor; (b) adding a template possibly forming mesopores through a heat treatment, into the gel, stirring and then aging; (c) forming a solid product by crystallizing the aged mixture in step (b); and (d) heat treating the solid product to remove the template. The ZSM-5 catalyst may include micropores and mesopores and may have good physical and chemical properties along with a good pore property. The production yield of the light olefins may be increased.

The present invention deals with a process for treating a polyimide comprising exposing said polyimide to a compound selected from the group consisting of dendrimers, hyperbranched polymers and mixtures thereof. The polyimide may be in the form of a membrane and the membrane, after treatment according to the process of the invention, may be suitable for use in a membrane-based separation technique, for example gas separation, filtration, microfiltration, ultrafiltration, reverse osmosis or pervaporation. The membrane may for example be suitable for separation of gas and hydrocarbon mixtures including mixtures of H2/N2, H2/CO2, He/N2, CO2/CH4, and C2-C4 hydrocarbon mixtures.

A process for desulfurization and, if necessary, for denitrification of hydrocarbon fractions is characterized in that: said hydrocarbon mixture is brought into contact with a non-aqueous ionic liquid of general formula Q<+>A<-> that contains at least one alkylating agent, making it possible to form ionic sulfur-containing derivatives (and, if necessary, nitrogen-containing derivatives) that have a preferred solubility in the ionic liquid; and said ionic liquid is separated from the hydrocarbon mixture that is low in sulfur and nitrogen by decanting.

The coating of internal surfaces of a workpiece is achieved by connecting a bias voltage such that the workpiece functions as a cathode and by connecting an anode at each opening of the workpiece. A source gas is introduced at an entrance opening, while a vacuum source is connected at an exit opening. Pressure within the workpiece is monitored and the resulting pressure information is used for maintaining a condition that exhibits the hollow cathode effect. Optionally, a pre-cleaning may be provided by introducing a hydrocarbon mixture and applying a negative bias to the workpiece, so as to sputter contaminants from the workpiece using argon gas. Argon gas may also be introduced during the coating processing to re-sputter the coating, thereby improving uniformity along the length of the workpiece. The coating may be a diamond-like carbon material having properties which are determined by controlling ion bombardment energy.

A process is described for preparing polyisobutene having a content of terminal vinylidene groups of at least 75 mol % by polymerizing isobutene or isobutenic hydrocarbon mixtures in the liquid phase in the presence of a boron trifluoride complex catalyst of the composition

(BF₃)_a.L¹_b.L²_c.L³_d

where L¹ is water, a primary C₁–C₅-alkanol and/or a secondary C₃–C₅-alkanol, L² is at least one aldehyde and/or one ketone, L³ is an ether having at least 5 carbon atoms, a secondary alkanol having at least 6 carbon atoms, a primary alkanol having at least 6 carbon atoms and/or a tertiary alkanol, the b:a ratio is in the range from 0.9 to 3.0, the c:a ratio is in the range from 0.01 to 0.5, and the d:a ratio is in the range from 0 to 1.0.

The invention relates to a poly-generation technique for using coal gas and coke oven gas as raw materials. The poly-generation technique comprises the following steps of: carrying out mixing on part of H2 prepared by purified water gas and coke oven gas through pressure swing adsorption and tail gas obtained by Fischer-Tropsch synthesis, carrying out Fischer-Tropsch synthesis and obtaining hydrocarbon mixture and tail gas. The CO2 separated from tail gas separate by first pressure swing adsorption enters a urea synthesis unit for reaction, the CO and the hydrogen respectively obtained by separation of second pressure swing adsorption and third pressure swing adsorption of the residual tail gas are circulated back to a Fischer-Tropsch synthesis unit for reaction; and the residual gases can be used for generating power or obtaining SNG by secondary condensation. The coke oven gas enters pressure swing adsorption after being purified and desulphurized so as to separate H2; wherein one part of H2 is used as supplementation of H2 needed by Fischer-Tropsch synthesis and the other part of H2 is mixed with N2 for ammonia synthesis so as to obtain synthetic ammonia; and the synthetic ammonia is mixed with CO2 obtained by the first condensation and CO2 separated from the Fischer-Tropsch synthesis for urea synthesis so as to obtain urea. The CO2 separated from the first condensation of desorption gas by pressure swing adsorption of the coke oven gas is used for urea synthesis; and the residual gases is treated by the second condensation to obtain SNG and mixed gas of CO and N2. The invention has no emission of greenhouse gases, uses richness in carbon and deficiency in hydrogen of the coal gas and the richness in hydrogen and deficiency in carbon of the coke oven gas to carry out complementation, realizes modulation of product structure by Fischer-Tropsch synthesis and improves the economical efficiency of the process of Fischer-Tropsch synthesis.

Low-energy, low-capital hydrogen production is disclosed. A reforming exchanger 14 is placed in parallel with an autothermal reformer (ATR) 10 to which are supplied a preheated steam-hydrocarbon mixture. An air-steam mixture is supplied to the burner/mixer of the ATR 10 to obtain a syngas effluent at 650°-1050° C. The effluent from the ATR is used to heat the reforming exchanger, and combined reformer effluent is shift converted and separated into a mixed gas stream and a hydrogen-rich product stream. High capital cost equipment such as steam-methane reformer and air separation plant are not required.

A process for increasing the production of benzene from a hydrocarbon mixture. A process for producing an aromatic hydrocarbon mixture and liquefied petroleum gas (LPG) from a hydrocarbon mixture, and a solvent extraction process for separating and recovering polar hydrocarbons from a hydrocarbon mixture containing polar hydrocarbons (that is, aromatic hydrocarbons) and nonpolar hydrocarbons (that is, non-aromatic hydrocarbons) are integrated, thereby it is possible to increase the production of benzene.

The invention relates to a method for preparing olefin by methanol or dimethyl ether, in particular to a high selectivity preparation method of propylene, which comprises a conversion reaction of methanol or dimethyl ether, alkylation of methanol and ethylene and a catalytic cracking reaction of a plurality of heavy components above C4. A hydrocarbon mixture rich in propylene is generated by preheated material contacting with a first catalyst in a circulating fluidized bed or a moving bed reactor. After the propylene is separated from the hydrocarbon mixture, a plurality of light components of the hydrocarbon mixture comprising hydrogen and methane return to a methanol conversion reactor, the propylene is generated by the alkylation of methanol and ethylene in the light components. The invention is characterized in that the C4 and the heavy components above C4 separated from separation system are contacted with cracking catalyst in the circulating fluidized bed, generating hydrocarbonmixture contained ethylene, propylene and other light components by the catalytic cracking reaction, then the hydrocarbon mixture returns to the separation system for obtaining propylene.

The present invention relates to the field of biomass derived fuels. It further relates to thermochemical production of liquids (biooils) from biomass. Specifically the present invention relates to methods of upgrading biooil. More specifically it relates to a method for upgrading biooil comprising contacting a dispersed mixture of hydrocarbon liquids, biooil, and partially upgraded biooil, with a transition metal containing catalyst and hydrogen gas at a temperature of around 330° C. and a pressure of about 1700 psi (11.7 MPa) for a period of time sufficient to reduce the oxygen content of the biooil such that it separates on cooling into an aqueous phase and an organic phase, and optionally, to further subject the organic phase to hydrotreating, hydrocracking or catalytic cracking to produce a mixture of hydrocarbons boiling in the range of gasoline, diesel and jet fuel.

The present invention relates to an ionic liquid compound of general formula C⁺A⁻, where C⁺ represents an organic cation such as alkyl-pyridinium, di-alkyl imidazolium and tri-alkyl imidazolium; and A⁻ is an anion of halides of iron (III), such as, for example, FeCl₄⁻ and to a method of producing the ionic liquid compound by heating the reactants using microwave energy. The ionic liquids can be used to desulfurize hydrocarbon mixtures by a liquid-liquid extraction.

The invention relates to a functional copolymer directly prepared from higher olefin mixture and a preparation method, and belongs to the field of application of petroleum resources. The preparation method includes: under the condition of nitrogen protection, adding one or more of MAH (maleic anhydride), maleimide and derivatives thereof and itaconic anhydride as well as oil soluble free radical initiator into selected solvent to be fully dissolved, then adding one or more of C8 and C9 fraction and light fraction of coal tar into the system to be mixed evenly, performing reaction at the temperature of 60-120 DEG C, and after reaction is finished, performing separating and drying to obtain the functional copolymer formed by copolymerization of olefin components and maleic anhydride in the mixture. C8 and C9 fraction and light fraction of coal tar are taken raw materials directly to be subjected to one-step reaction for preparing the copolymer comprising functional radicals, the process is simple, reaction conditions are mild, preparation efficiency is high, the prepared copolymer and non-polymerization components are easy to separate, the copolymer is high in functional radical content, and resources of C8 and C9 fraction and light fraction of coal tar can be utilized reasonably and effectively.

Provided is a process for converting methane at a remote natural gas site into ethylene and other products. Methane is converted into syngas which is converted into a low-sulfur liquid hydrocarbon mixture containing less than 1 ppm sulfur via Fischer-Tropsch (FT) syntheses. The low-sulfur Fischer-Tropsch liquids are transferred from the remote site to an existing facility where a sulfur-containing compound or a sulfur-containing hydrocarbon mixture is added to avoid coking problems. The resultant blend of hydrocarbons which has a sulfur content of at least 1 ppm, is fed to a naphtha cracking unit and ethylene recovered.

Isobutene in isobutenic hydrocarbon mixtures is oligomerized over a solid acidic ion exchange resin, said acidic ion exchange resin containing, for example, sulfonic acid groups, some of whose protons have been exchanged for metal ions.

This invention discloses a method that makes low-carbon olefin hydrocarbon by catalyzing decomposition. This method uses mixture of C4 or C5 without double olefin hydrocarbon as raw materials, mixes the raw materials and water with their volume ratio 0.3-1.5, in the solid bed reactor to react contacting with the zeolite catalyst with high silicon aluminum ratio, and produces the reacting mixture containing propene and ethane. The zeolite catalyst is composed of high silicon zeolite20-65%, the silicon-aluminum ratio 50-300, monox 20-65%, inorganic oxidant 0-20%. This invention can get high yields of ethane and propene, therefore, this invention explores the important way of compound utilization of C4 and C5 cut fractions in the ethane mills and refineries.