364results about "Hydrocarbon purification/separation" patented technology

The invention discloses an ether polymerization inhibitor special for a butadiene extraction system and a preparation method of the ether polymerization inhibitor. The ether polymerization inhibitor comprises the following raw materials: a polymerization inhibitor intermediate, a solvent and a dispersing agent, the production process comprises the following steps: preparing a polymerization inhibitor intermediate, preparing a solvent, compounding, feeding and mixing, filtering, removing impurities and detecting. According to the method, firstly, a polymerization inhibitor 701 and diethylene glycol normal pressure etherification process is adopted, and beta-hydroxyethyl methyl ether is introduced to seal a terminal group, so that the power consumption is reduced, the generation of byproducts is inhibited, the solubility of an intermediate acetonitrile is improved to be greater than or equal to 30g / L, and the anti-interference performance is greatly enhanced; the solvent doped with a small amount of silane modified nano diatomite is prepared, impurities can be adsorbed, metal ions can be chelated, the dispersing agent can be assisted to be evenly distributed, the problems that a pure water solvent is single in function and the dispersing agent is prone to agglomeration are solved, and the polymerization inhibition efficiency and the stability of an extraction system are guaranteed.

The invention relates to the technical field of fuel cells, and particularly provides a catalytic reforming hydrogen production fuel cell system for methane separation by a hydrate method. The cell system comprises a methane hydrate reaction module, a methane catalytic reforming module, a fuel cell module and a tail gas collection module. In the coal mining process, due to limitation of technical reasons, most low-concentration coal mine gas can be directly emptied, so that resource waste and environment damage are caused; in recent years, a hydrate technology is widely concerned to be used for separating and storing gas, and the method is relatively safe and can effectively reduce the risk of gas explosion. According to the invention, the low-concentration gas is separated and purified according to the temperature and pressure difference under the condition that different components in the low-concentration gas form hydrates, high-concentration CH4 is used as fuel and enters the fuel cell module, chemical energy is converted into electric energy, and the electric energy is provided for coal mine production and living places; the utilization scene of the low-concentration gas is expanded; and the utilization efficiency of the low-concentration gas is improved.

A method of manufacturing sugar cane polyvinyl alcohol wherein sugar cane bagasse is processed into polyvinyl alcohol. Processing raw materials including sugar cane bagasse and deionized water. Enzymatically hydrolyzing and using saccharification on the sugar cane bagasse to obtain sugar cane bagasse enzymatic hydrolysate. Fermenting the sugar cane bagasse solution. Distilling the fermented sugar cane bagasse solution to obtain ethanol solution and lignin solution. Transferring the distilled solutions to an ethylene plant area to obtain a polymer grade ethylene product. Transferring the polymer grade ethylene product to an acetic acid evaporator to generate vinyl acetate. Introducing the vinyl acetate into an autoclave with methanol solution wherein said solutions undergo a reflux reaction process. Ethyl acetate is then dissolved in methanol to prepare a polyvinyl acetate solution which undergoes alcoholysis wherein the product is then washed and deionized, yielding polyvinyl alcohol.

To provide a process for producing renewable linear alkylbenzenes from vegetable, animal, nut and / or seed oils, which are biorenewable resources.SOLUTION: The process includes: a linear selective cracking process to crack C14+ chains into C9 to C14 chains which are useful for producing linear alkylbenzene for use in detergents; and a hydroisomerization step to produce paraffins with monomethyl branching which can be reacted with benzene to form monomethyl alkyl benzenes.SELECTED DRAWING: None

A process for converting naphtha is disclosed. The process comprises contacting a naphtha stream and a hydrogen stream with a catalyst in a reactor to produce a paraffinic stream. The ethane present in the paraffinic stream is converted into ethylene in a steam cracking unit. An ethylene stream is separated from a C3+ hydrocarbon stream and the C3+ hydrocarbon stream is recycled to the reactor.

To provide a method for producing ethylene in high yield by selective hydrogenation of a gas mixture containing high-concentration acetylene generated by a methane pyrolysis process.SOLUTION: There is disclosed a process for converting methane into value-added compounds, wherein a gas mixture containing high-concentration acetylene as well as hydrogen formed through methane pyrolysis (for example, non-oxidative coupling of methane) is selectively hydrogenated in the presence of a bimetallic supported catalyst to obtain ethylene from acetylene in the gas mixture, while unreacted methane and hydrogen are recovered as byproducts and / or additionally recycled.SELECTED DRAWING: Figure 1

An olefin conversion catalyst, its preparation method and its use are disclosed. The olefin conversion catalyst comprises the following components in parts by weight: a) 50-90 parts of a molecular sieve having a 12-membered or more ring structure; b) 0.1-10 parts of an additive component selected from a group IA metal element, a group IIA metal element, or a combination thereof, calculated as oxide; c) 0.1-10 parts of a modifier component selected from silicon, germanium, bismuth, tin, boron, gallium, or a combination thereof, calculated as oxide; and d) 10-49 parts of a carrier component. When the catalyst is used to convert a small amount of olefins in an aromatic rich distillate, the catalyst has the characteristics of high activity, stability, long life, and effective utilization of olefins.

A method of selectively producing oligomers can include contacting at least one antifouling agent with a first amount of at least one aluminum alkyl compound to form at least one antifouling compound comprising the following structure or dimer form thereof: (I); and adding the at least one antifouling compound, an additional amount of the at least one aluminum alkyl compound, the at least one titanate compound, and ethylene to a jet loop reactor to oligomerize the ethylene to produce one or more of 1-butene, 1-hexene, or 1-octene. (I)

The utility model discloses a hexane filtering device, which relates to the field of hexane filtering, and comprises a second cylinder, the upper end of the second cylinder is connected with a first cylinder, the lower end of the second cylinder is connected with a third cylinder, the upper end of the first cylinder is connected with a plurality of liquid discharge pipes in a penetrating manner, the lower end of the third cylinder is connected with a liquid inlet pipe in a penetrating manner, and the liquid inlet pipe is connected with a liquid outlet pipe in a penetrating manner. A supporting part is arranged on the inner wall face of the second barrel, a first filtering part is arranged in the supporting part, a first screening plate, a second filtering part and a second screening plate are sequentially arranged on the inner wall face of the third barrel from top to bottom, and a guiding part is connected to the upper end of the liquid inlet pipe. The supporting component, the first filtering component, the second filtering component, the first sieve plate and the second sieve plate are arranged and matched together, so that the filtering effect can be improved, particles in the first filtering component and the second filtering component can float up and down, the blocking condition is avoided, and the overall filtering performance is guaranteed.

The utility model relates to a device for producing a monomethyl alkylbenzene product, which is characterized by comprising a deoxidation unit, a natural oil feeding pipeline, a gas-liquid separation unit and a gas-liquid separation unit, a C9 to C28 line in communication with the deoxidation unit; the isomerization unit is communicated with the first pipeline; an isomerization line in communication with the isomerization unit, the isomerization line comprising a monomethyl paraffin; the dehydrogenation unit is communicated with the isomerization pipeline; a dehydrogenation line communicating with the dehydrogenation unit; a selective hydrogenation unit in communication with the dehydrogenation line; a monoolefine line in communication with the selective hydrogenation unit; an alkylation unit in communication with the monoolefine line; and an alkylation effluent line in communication with the alkylation unit. The utility model provides a material flow rich in monomethyl paraffin relative to normal paraffin, wherein the material flow can be used for producing monomethyl alkylbenzene.

The invention discloses a pure silica zeolite DD3R hydrogenation catalyst as well as a preparation method and application thereof. The pure silica zeolite DD3R hydrogenation catalyst takes a DD3R molecular sieve as a carrier, and a Cu element and a Pd element are loaded on the carrier; in the pure silica zeolite DD3R hydrogenation catalyst, the mass ratio of the Pd element is 0.2 wt%-0.6 wt%, and the mass ratio of the Cu element is 0.2 wt%-0.7 wt%. The preparation method comprises the following steps: adding the structure-directing agent, the silicon source and the mineralizing agent into deionized water, and uniformly mixing; adding a palladium source and a copper source, then adding a seed crystal, and crystallizing for a certain time; and carrying out suction filtration, washing, drying, roasting and the like on the obtained sample to prepare the pure silica zeolite DD3R hydrogenation catalyst. The catalyst prepared by the invention is used for a reaction for removing trace acetylene in ethylene through thermocatalytic hydrogenation, has high specific surface area, high catalytic activity, high selectivity and high thermal stability, and can still keep relatively high catalytic activity at a high space velocity.

Compositions and methods for inhibiting and retarding polymerization of monomeric compositions are described that use a naphthoquinone and an oxygenated aminophenol. When present in a monomer-containing composition, the combination of naphthoquinone and oxygen-containing aminophenol provides an unexpectedly beneficial anti-polymerization agent effect, thereby inhibiting the formation of unwanted fouling polymers. The anti-polymerization agent combination can be added to a hydrocarbon composition, such as petroleum, that can include a polymerizable component, such as styrene, wherein the hydrocarbon composition is purified or processed, such as under distillation.

A product and method for reducing fouling of a vinyl aromatic monomer including a first composition comprising an effective amount of one or more dispersants and a second composition comprising an effective amount of one or more polymerization inhibitors, an effective amount of one or more polymerization retarders, or combinations thereof.

The present application relates to a dehydrogenation catalyst, a preparation method and application thereof, and a method for preparing butadiene by butene oxidative dehydrogenation, and provides a dehydrogenation catalyst, which comprises: a spinel phase, an alpha-iron oxide phase, and an antioxidant alloy component; the antioxidant alloy component is selected from at least three of IVB group, VIB group and VIII group; the present application introduces hydrogenation active centers by adding an antioxidant metal alloy component in the spinel structure, and hydrogenation reaction is generated by using a small amount of hydrogen generated in the reaction to inhibit the generation of aldehydes, so that the content of aldehydes in the organic by-products of the dehydrogenation product is greatly reduced, and the selectivity of the catalyst is improved.

This invention discloses an organic polysulfide, its preparation method, and its applications. The organic polysulfide has a sulfur content of 45% or more, preferably 50wt%-80wt%, and the organic sulfur composition contains a cyclic trisulfide CnR2nS3. The preparation method of the organic polysulfide includes the following steps: elemental sulfur and unsaturated hydrocarbons react under the catalysis of an alkaline substance. The reaction temperature is controlled by heating the material system containing elemental sulfur, monitoring the viscosity coefficient of the material system, and recording the temperature of the material system as T when the viscosity coefficient gradually increases. The temperature of the material system is controlled to be 0-15°C above T. After the reaction is continued for a period of time, the temperature is lowered, and the liquid material is separated to obtain the sulfur-containing composition. The organic polysulfide not only has a simple and easy-to-control preparation method, but also contains cyclic organic polysulfide compounds with long sulfur chains and a high mass content of cyclic polysulfide compounds.

The invention relates to the field of catalysts, and discloses a CeO2-containing olefin deoxidation catalyst as well as a preparation method and application thereof. The olefin deoxidation catalyst containing CeO2 comprises a carrier and an active component loaded on the carrier, the carrier contains CeO2 and an auxiliary agent, the auxiliary agent is selected from one or more than two of Mn oxide, Zn oxide, Na oxide and K oxide, and the active component is Pd oxide. The olefin deoxidation catalyst containing CeO2 has high catalytic activity, can perform deep deoxidation on olefin feed gas with low oxygen content, has the deoxidation rate up to 99.8%, and has a good application prospect in the aspect of olefin deoxidation.

A process for converting naphtha is disclosed. The process comprises contacting a naphtha stream and a hydrogen stream with a catalyst in a reactor to produce a light paraffinic stream. The light paraffinic stream is separated into an ethane stream and a propane stream. A propane recycle stream taken from the propane stream is recycled to the reactor.

The present application relates to chemical technology field, especially a kind of ethane cracking device and start-up emission reduction method, including cracking section, compression section, separation section, separation section includes deethanizer, cold area, hot area, with deethanizer as limit, deethanizer top connects cold area, bottom connects hot area, cold area includes carbon two hydrogenator, demethanizer, ethylene column, cold box, refrigeration system, deethanizer top pipeline is connected with carbon two hydrogenator, hydrogenated material is cooled in cold box, one way output hydrogen, another way is connected with demethanizer, demethanizer top outputs methane, bottom is connected with ethylene column, ethylene column top exports ethylene, bottom exports ethane, refrigeration system is cooled to carbon two hydrogenator export material, demethanizer top, bottom material, ethylene column top, bottom material of ethylene column, the present application has the following beneficial effects: not only can shorten the product qualified time of each system after cracking furnace feed, reduce start-up emission, but also can improve the safety of operation.

Compositions and methods for inhibiting and retarding the polymerization of monomer compositions using naphthoquinones and hydroxylamines are described. When present in a monomer-containing composition, the combination of naphthoquinone and hydroxylamine provides an unexpectedly beneficial polymerization inhibitor effect that inhibits the undesirable formation of contaminating polymers. The polymerization inhibitor combination can be added to hydrocarbon compositions, such as petroleum, which may contain polymerizable components such as styrene, and the hydrocarbon composition is purified or processed, such as by distillation.

The present invention discloses a system and process for the comprehensive utilization of hydrogen within a cyclohexanone esterification process plant, including the comprehensive utilization of tail hydrogen emitted from a benzene selective hydrogenation unit, the hydrogen source and emitted hydrogen from a cyclohexyl acetate hydrogenation unit, the hydrogen source and emitted tail hydrogen from a cyclohexane hydrorefining unit, and by-product hydrogen from a cyclohexanol dehydrogenation reaction unit. A system for treating and utilizing hydrogen within the plant is invented. Taking into account the composition of each emitted hydrogen or by-product hydrogen, the system utilizes mature, conventional technologies for low-cost treatment of the emitted hydrogen or by-product hydrogen, rather than employing TSA and / or PSA methods. This system achieves cascaded utilization of hydrogen within the cyclohexanone plant, reduces the amount of discharged hydrogen processed and the loss of valuable materials, reduces the amount of new hydrogen added to the plant, and reduces the production cost of cyclohexanone esterification process, thus having industrial application value.

Polymerization inhibitor compositions are provided. The polymerization inhibitor compositions include at least a first inhibitor compound including a hydroxylamine, a second inhibitor including phenylenediamine, and a third inhibitor including a benzoquinone or naphthoquinone. Methods of inhibiting the polymerization of monomers using the compositions of the disclosure are also provided. The methods of inhibiting polymerization of monomers include a step of adding a composition of the disclosure to the monomer. In some instances, the monomer is an ethylenically unsaturated monomer. Such ethylenically unsaturated monomers include, but are not limited to, vinyl acetate, acrylonitrile, acrylates, methacrylates, 1,3-butadiene, styrene, isoprene, (meth)acrylic acid, and combinations thereof. Methods of preparing the polymerization inhibitors and compositions of the disclosure are also provided.

Inhibitor compositions for abating undesirable polymerization during processing of hydrocarbon stream laden with reactive vinylic monomers are provided. The polymerization inhibitor compositions include at least a first inhibitor compound having a stable nitroxide radical and a second inhibitor including phenylenediamine. Methods of inhibiting the polymerization of monomers using the compositions of the disclosure are also provided. The methods of inhibiting polymerization of monomers include a step of adding a composition of the disclosure to the monomer. In some instances, the monomer is an ethylenically unsaturated monomer. Such ethylenically unsaturated monomers include, but are not limited to, vinyl acetate, acrylonitrile, acrylates, methacrylates, 1,3-butadiene, styrene, isoprene, (meth)acrylic acid, and combinations thereof. Methods of preparing the polymerization inhibitors and compositions of the disclosure are also provided.

The embodiment of the application provides a kind of LNG receiving station gas-liquid mixed phase light hydrocarbon separation process system, it is related to light hydrocarbon cryogenic separation technical field.The first heat exchanger is included;Demethanizer has gas phase outlet and liquid phase outlet, gas phase outlet is set in the top of demethanizer, and liquid phase outlet is set in the bottom of demethanizer, to guide the lean natural gas of demethanizer and demethanization liquid to the outside of demethanizer;First conveying pipeline is used to transport raw material natural gas, first conveying pipeline is connected with the first inlet of demethanizer by first heat exchanger;Second conveying pipeline is used to transport raw material LNG, second conveying pipeline is connected with the second inlet of demethanizer by first heat exchanger, in first heat exchanger, raw material natural gas and raw material LNG are heat exchanged.The light hydrocarbon separation process system provided in the application can improve the recovery rate of light hydrocarbon, reduce the energy consumption of light hydrocarbon separation process, in addition, the process system can gasify LNG, reduce the energy consumption of LNG gasification in the LNG receiving station export process.

A methane purification device 1 comprises a flow path 10 through which a methane-containing gas flows, an ozone supply unit 20 that supplies ozone to the gas, and a non-metallic heater 32, which is arranged downstream of the ozone supply unit 20 in the flow path 10 and heats the gas and the ozone. The heater 32 carries a catalyst for purifying the methane by causing the ozone to react with the methane.

According to one embodiment, a catalyst system that reduces polymeric fouling may comprise at least one titanate compound, at least one aluminum compound, and at least one antifouling agent or a derivative thereof. The antifouling agent may comprise a structure comprising a central aluminum molecule bound to an R1 group, bound to an R2 group, and bound to an R3 group. One or more of the chemical groups R1, R2, and R3 may be antifouling groups comprising the structure —O((CH2)nO)mR4, where n is an integer from 1 to 20, m is an integer from 1 to 100, and R4 is a hydrocarbyl group. The chemical groups R1, R2, or R3 that do not comprise the antifouling group, if any, may be hydrocarbyl groups.

The application discloses a kind of carbon four alkynyl selective hydrogenation catalyst and preparation method thereof, the preparation method includes: the soluble precursor of Ni and the soluble precursor of Cu are dissolved in water, stirring is formed microemulsion, carrier after high-temperature calcination is added to prepared microemulsion and impregnated, dry, calcination, obtain semi-finished product catalyst A;The soluble precursor of Pd is dissolved in water, then semi-finished product catalyst A is added to Pd-containing solution and impregnated, dry, calcination, obtain semi-finished product catalyst B;The soluble precursor of Ce and the soluble precursor of Pt are dissolved in deionized water, semi-finished product catalyst B is impregnated in the solution containing Ce and Pt, after solution is all absorbed, dry, calcination, obtain semi-finished product catalyst C;The soluble precursor of Pb is dissolved in deionized water;Semi-finished product catalyst C is impregnated in the solution containing Pb, after solution is completely absorbed, dry, calcination, obtain final catalyst.

This invention relates to the field of selective hydrogenation technology, specifically to a selective hydrogenation catalyst for alkynes and dienes, its preparation method, and its application. The catalyst provided by this invention uses a modified composite oxide as a support, on which active components are loaded; wherein the modified composite oxide uses a composite oxide as a support, on which alkali metal hydroxides are loaded; the composite oxide includes alumina and zirconium oxide; the active components include nickel, iron, lead, and selenium. The catalyst provided by this invention not only possesses high reactivity and high selectivity, but also avoids excessive hydrogenation to form alkanes, while inhibiting or preventing olefin isomerization to form other isomers. Furthermore, it exhibits high stability, a long single-pass life, and does not require frequent regeneration.

A process for producing a hydrocarbon stream comprising hydrocarbons boiling in the jet fuel range, said process comprising: a) passing a synthesis gas (syngas) stream comprising a carbon oxide and hydrogen over a fixed bed comprising a dual-function catalyst active in the conversion of syngas to the oxygenate(s) methanol (MeOH) and / or dimethyl ether (DME), and the conversion of said oxygenate(s) to an olefin product stream; wherein the dual-function catalyst comprises: a MeOH synthesis catalyst, in which the MeOH synthesis catalyst is a Cu and Cr-free catalyst comprising an oxide of Zn in combination with an oxide of any of: Zr, Al, Si, Ti, Ce, La, Ga, In, Mo, Mn, Mg, Y, or combinations thereof; and an oxygenate conversion catalyst comprising a zeolite with a framework having a 10-ring pore structure, in which the 10-ring pore structure comprises a unidimensional (1-D) pore structure selected from any of: *MRE (ZSM-48), MTT (ZSM-23), TON (ZSM-22), or combinations thereof; b) passing at least a portion of the olefin product stream through an oligomerization step over an oligomerization catalyst, and optionally subsequently conducting a separation step, for thereby producing an oligomerized stream; c) passing at least a portion of the oligomerized stream through a hydrogenation step over a hydrogenation catalyst, and optionally subsequently conducting a separation step, for thereby producing said hydrocarbon stream comprising hydrocarbons boiling in the jet fuel range, optionally also comprising hydrocarbons boiling in the diesel fuel range. The invention provides also a plant for conducting the process.

Methods for producing olefins through hydrocarbon steam cracking include passing a hydrocarbon feed that includes one or more hydrocarbons to a hydrocarbon cracking unit and passing one or more sulfur-containing compounds to the hydrocarbon cracking unit. The sulfur-containing compounds include at least hydrogen sulfide gas, and a flow rate of the sulfur-containing compounds to the hydrocarbon cracking unit is sufficient to produce a molar concentration of elemental sulfur in the hydrocarbon cracking unit of from 10 ppm to 200 ppm. The methods include cracking the hydrocarbon feed in the hydrocarbon cracking unit to produce a cracker effluent and contacting the cracker effluent with a quench fluid in a quench unit to produce at least a cracked gas and a first pygas. The first pygas has a concentration of carbon disulfide less than 50 ppmw based on the total mass flow rate of the first pygas.

The present invention relates to air stable, binary Ni(0)-olefin complexes and their use in organic synthesis.