116 results about "Propadiene" patented technology

The invention relates the multicomponent mixed working substance used for preparing dual-temperature by single-machine vapor compression refrigerator. The low temperature is between -60- -40Deg.C and the high temperature is between -25- 10Deg.C. The multicomponent mixed working substance comprises lower boiling working substance and high boiling working substance. The lower boiling working substance comprises tetrafluoromethane, ethylene, ethane, fluoroethylene, trifluoromethane, fluoromethane, hydrofluoeic ether, carbon dioxide, difluoromethane and penfluoroethane; the high boiling working substance comprises trifluoro-thane, hydrofluoeic ether, propylene, propane, perfluoropropylamine, propadiene, cyclopropane, difluo-monochloromethane, penta-monochloroethane, perfluoroethane, difluoroethane, isobutene, butane, butylenes, isobutylene, sevofluoropropane, hexafluoropropane, penfluoropropane and tetrachloromonofluoroethane.

The present invention provides new highly-efficient separation processes and systems for separating polymerization-grade ethylene and propylene from an initial effluent stream comprising ethane, ethylene, propylene, dimethyl ether, and one or more of propane, acetylene, methyl acetylene, propadiene, methane, hydrogen, carbon monoxide, carbon dioxide and C₄+ components. In one embodiment, the initial effluent stream is provided from a methanol-to-olefin reaction system. It has been discovered that an efficient separation of these components is realized when DME is partially removed in a first separation step comprising methanol and water washing steps, followed by separation of the remaining components in additional separation steps.

The invention relates to a selective hydrogenation method for a C3 fraction. The method is characterized in that: an adiabatic bed reactor is provided with a Pd-Ag catalyst, the Pd-Ag catalyst contains Al2O3 used as a carrier, 0.2-0.4% of Pd and preferable 0.05-0.2% of Ag based on 100wt% of the catalyst, the specific surface area of the catalyst is 15-100 m<2>/g, the pore volume of the catalyst is 0.3-0.6 mL/g, and the catalyst forms an organic polymer metal complex during preparation process; and the hydrogenation process conditions are as follows: the inlet temperature of the fixed bed reactor is 10-50 DEG C, the reaction pressure is 2.5-3.5 MPa, the liquid phase volume space velocity is 5-100 h<-1> and the mol ratio of hydrogen to propyne and propadiene is (1-5):1. The selective hydrogenation method provided by the invention improves the hydrogenation activity and selectivity, greatly broadens the reaction space velocity range, greatly improves the running safety and efficiency of an apparatus and greatly improves economical benefits of the apparatus.

The invention is a process for epoxidizing an olefin with hydrogen and oxygen in the presence of a noble metal-containing titanium or vanadium zeolite and a modifier selected from the group consisting of carbon monoxide, methylacetylene, and propadiene. The process results in significantly reduced alkane by-product formed by the hydrogenation of olefin compared to processes that do not use the carbon monoxide, methylacetylene, and/or propadiene modifier.

The present invention provides new highly-efficient separation processes and systems for separating polymerization-grade ethylene and propylene from an initial effluent stream comprising ethane, ethylene, propylene, dimethyl ether, and one or more of propane, acetylene, methyl acetylene, propadiene, methane, hydrogen, carbon monoxide, carbon dioxide and C₄+ components. In one embodiment, the initial effluent stream is provided from a methanol-to-olefin reaction system. It has been discovered that an efficient separation of these components is realized when DME is partially removed in a first separation step comprising methanol and water washing steps, followed by separation of the remaining components in additional separation steps.

A water writing paper simulating the Xuan paper is composed of black base paper and coated white layer, and is prepared through making black base paper, preparing white paint and coating. Said black base paper contains pulp fibres, black pigment, adhesive, acid salt, dry strnegthening agent, and wet strengthening agent. Said white paint paint contains white pigment, disperser, adhesive (butadiene-styrene or propadiene styrene emulsion and PVA), cross-linking agent and regulator. Its advantages are low cost, clear tracing and cyclic use.

A fuel containing methylacetylene-propadiene, commonly referred to as MAPP gas, produces thrust in a flight vehicle having a pulse detonation engine. The MAPP gas fuel of this invention may be used alone or combined with other conventional fuels such as hydrogen, JP-4, JP-5, JP-10, kerosene or any other suitable hydrocarbon fuel. Such hydrocarbon containing fuel includes, but is not limited to, acetylene, methane, ethylene, propane, butane or liquified petroleum gas. MAPP gas fuel is mixed with an oxidant containing oxygen or air and ignited. The detonation wave created produces thrust for the flight vehicle. A method of powering a flight vehicle having a pulse detonation engine with MAPP gas fuel is also disclosed.

It has been discovered that a dual bed process using two different catalysts for the selective hydrogenation of acetylene and/or methyl acetylene (MA) and/or propadiene (PD) in a light olefin-rich feedstream can be accomplished with less selectivity to making oligomers (green oil) as compared with existing commercial technologies, if a low oligomers selectivity catalyst is used first in the process. A palladium catalyst may be used as a second, sequential catalyst to further hydrogenate acetylene and/or MAPD while consuming at least a portion of the balance of the hydrogen present. The first catalyst should be different from the second catalyst.

The invention discloses a fixed bed hydrogenation reactor and an application method thereof. In the fixed bed hydrogenation reactor, a gas-liquid phase product pre-separation technology with gas phase withdrawal in an axial center position is employed, wherein a plurality layers of baffle plates are arranged on the inner wall of the reactor, thereby improving operation stability of the hydrogenation system, improving gas-liquid distribution status in the reactor and eliminating wall flow, deflected flow and the like defects. The reactor, when being used in a reaction process of C3 fraction liquid-phase selective hydrogenation to remove methyl acetylene (MA) and propadiene (PD), can not only increase the MAPD hydrogenation purification reaction efficiency of a propadiene material but also is low in residual hydrogen, so that separation load in a down-stream propylene rectification column is reduced.

The present invention provides new highly-efficient separation processes and systems for separating polymerization-grade ethylene and propylene from an initial effluent stream comprising ethane, ethylene, propylene, dimethyl ether, and one or more of propane, acetylene, methyl acetylene, propadiene, methane, hydrogen, carbon monoxide, carbon dioxide and C4+ components. In one embodiment, the initial effluent stream is provided from a methanol-to-olefin reaction system. It has been discovered that the best separation of these components is realized when DME is selectively removed in a first separation step, followed by separation of the remaining components in additional separation steps.

The present invention is a heat-integrated process for obtaining an ethylene and propylene enriched stream from an oxygenate to olefin reactor. The process comprises providing an effluent stream from an oxygenate to olefins reactor. The effluent stream comprises ethylene, propylene and one or more byproducts selected from the group consisting of propane, methyl acetylene, propadiene, dimethyl ether, acetaldyhyde and butylene. The process further includes quenching the effluent stream with the quench medium to provide an olefin stream. The olefin stream is separated into a heavy fraction and a remaining fraction. The remaining fraction is directed to a distillation column which separates the remaining fraction into a first fraction comprising a majority of both ethylene and a propylene and a second fraction comprising at least a majority of one or more heavier fraction. The bottoms of the distillation column is reboiled by the quench medium. The separation step allows the bottoms of the distillation column to be reboiled at a lower temperature.

The multicomponent mixed work medium throttling refrigerating agent applicable to medium-low temp. zone includes five groups of substances, the sum of their mole concentration is 100%, in which first group includes methane, krypton or mixture, total mole concentration is 5%-45%, second group includes tetrafluoromethane, nitrogen trifluoride or mixture, total mole concentration is 15%-55%; fourth group includes propylene, propane, perfluoropane, 1,1,1-trifluoroethane, 1,1-bifluoroethane, fluoroethane, propadiene, cyclopropane, or mixture, total mole concentration is 5%-25%; fifth group includes 1-butylene, isobutane, 2-methylbutane, 1-pentene, 3-methyl-1-butylene, 2-methylpentane, 2-butylene, isobutylene, n-butane, perfluorobutane, n-pentane or mixture, total mole concentration is 5%-25%.

The present invention provides useful fuel compositions which may be produced substantially from renewable resources, such as biomass, to provide green fuel compositions, methods, and systems. In some embodiments, fuel compositions include dimethyl ether and one or more C₂ or larger alcohol, such as ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, isobutanol, or tert-butanol. In some embodiments, fuel compositions include dimethyl ether and one or more C₂ or larger hydrocarbons, such as propane, propylene, propyne, and propadiene, n-butane, isobutane, isobutylene, 1-butene, 2-butene, or 1,3-butadiene. Methods of making these novel DME-based fuel compositions, particularly from biomass-derived syngas, are described. Various applications and methods of using the fuel compositions, such as portable cylinder fuels for camping, are disclosed. Additionally, principles of burner design for these fuel compositions are disclosed herein.

A propane dehydrogenation and propylene purification process in which a stream comprising propylene, propane, and methyl acetylene and propadiene (MAPD) is mixed with a hydrogen stream then reacted in at least three distinct reaction zones in a hydrogenation reactor system where MAPD is hydrogenated by a high-selectivity hydrogenation catalyst in a first reaction zone, and a second and a third reaction zones each have a low-selectivity hydrogenation catalyst to remove unreacted hydrogen. The outlet stream leaving the hydrogenation reactor system is MAPD-free and can be fed to a splitter column, which now mainly serves to separate propylene from propane. Various embodiments of reaction zone arrangements in a single or multiple reactors are also provided.

The invention discloses a process for carrying reaction, rectifying and coupling to selectively hydrogenate to remove MAPD (Methylacetylene Propadiene) from refined propylene. A C3 fraction directly enters a propylene rectification tower or enters the propylene rectification tower after being pre-transformed by a first MAPD reactor; the MAPD is enriched into a stripping section and a tower kettlein the propylene rectification tower; and liquid is collected from a higher MAPD concentration position in the propylene rectification tower, is mixed with hydrogen to enter a second MAPD reactor andthen return to the propylene rectification tower. The treatment of the C3 fraction realizes the effective separation of the propylene and the MAPD, thereby increasing the selectivity of converting the MAPD into the propylene and realizing the purpose of increasing the yield of the propylene. In addition, the requirement of catalyst activity in the MAPD converting process is greatly reduced.

The present invention provides a new propylene-containing compositions, which preferably are suitable for polymerization disposition. The propylene-containing compositions include propylene, propane, dimethyl ether and one or more of ethylene, ethane, methanol, acetylene, methyl acetylene, propadiene, C4+ hydrocarbons and water. The propylene-containing composition can be derived from an oxygenate to olefin reaction system without expending resources on propane/propylene separation.

A process is provided to separate a hydrocarbon stream comprising a mixture of light olefins and light paraffins, the process comprising sending the hydrocarbon stream through a pretreatment unit to remove impurities selected from the group consisting of sulfur compounds, arsine, phosphine, methyl acetylene, propadiene, and acetylene to produce a treated hydrocarbon stream; vaporizing the treated hydrocarbon stream to produce a gaseous treated hydrocarbon stream; adding liquid or vapor water to the gaseous treated hydrocarbon stream; then contacting the gaseous treated hydrocarbon stream to a membrane in a membrane system comprising one or more membrane units to produce a permeate stream comprising about 96 to 99.9 wt % light olefins and a retentate stream comprising light paraffins.

The invention provides a synthesis method of a medical intermediate 3-oxocyclobutanecarboxylic acid. A target product 3-oxocyclobutanecarboxylic acid is obtained by adopting acetone, bromine and malononitrile as raw materials, adopting ethanol, DMF (dimethyl formamide) and water as solvents, adopting sodium iodide as an activating agent and tetrabutylammonium bromide (TBAB) as a phase transfer catalyst through three-step reaction. By measurement of H-nuclear magnetic resonance, a mass spectrum, the high-efficiency gas chromatography and a melting point, the synthesized final product is proved to be the 3-oxocyclobutanecarboxylic acid, the purity of 3-oxocyclobutanecarboxylic acid is 99 to 99.2 percent, and the yield of 3-oxocyclobutanecarboxylic acid is 52 to 68 percent. The synthesis method is simple in process route, short in production period and low in synthesis cost; meanwhile, the application of highly toxic products such as osmium tetroxide and propadiene can be avoided, and the process is more moderate, more reliable and safer; and the solvents such as the ethanol, the DMF and the methylbenzene can be recycled in the reaction process, so that the emission and processing costs of toxic reagent can be reduced, the national environmental protection can be achieved, and a good industrialized production prospect can be realized.

A process for purifying an olefin-containing hydrocarbon feedstock comprising the steps of:

• • (a) passing the said hydrocarbon feedstock in the presence of hydrogen over a first catalyst bed material comprising nickel deposited on a support material wherein said nickel is present as both nickel oxide and metallic nickel
  • (b) recovering the feedstock having a substantially reduced acetylenics (in particular methylacetylene) and allenes (in particular propadiene) content.

The invention relates to a selective hydrogenation method for a C3 fraction. The C3 fraction used as a hydrogenation raw material undergoes hydrogen distribution, and is selectively hydrogenated by anFe-Co catalyst to convert methylacetylene (MA) and propadiene (PD) in the material into propylene. The carrier of the catalyst is a high temperature-resistant inorganic oxide, the active components of the catalyst at least contain Fe and Co, and 100 mass% of the catalyst contains 9-15 mass% of Fe and 3-4 mass% of Co; and the specific surface area of the catalyst is 10-300 m<2>/g, and the pore volume is 0.2-0.65 ml/g, wherein Fe and Co are loaded on the carrier in an impregnating manner, and the Fe and Co supported carrier is calcined, and is reduced in a hydrogen atmosphere to prepare the catalyst. Reaction conditions are as follows: the inlet temperature is 30-50 DEG C, the pressure is 1.5-3.5 MPa, the liquid space velocity is 15-120 h<-1>, and a ratio of hydrogen/MAPD is 1-10. The catalyst has the advantages of good hydrogenation activity, excellent olefin selectivity, high olefin increment and good long-period running performance, and has a lower cost than a precious metal Pd catalyst.

The invention discloses a sealing rubber strip for an automobile window. The sealing rubber strip is made of the following materials in parts by weight: 22-26 parts of polyvinyl chloride, 40-45 parts of ethylene-propylene-diene-terpolymer rubber, 6-10 parts of paraffin, 7-11 parts of poly propadiene siloxane, 12-15 parts of tert-Butylhydroquinone, 18-20 parts of diisobutyl phthalate, 9-14 parts of sulfydryl acid ester, 8-12 parts of lauryl alcohol polyoxyethylene, 6-12 parts of sodium fluosilicate, 2-4 parts of coal gangue, 15-20 parts of carbon black, 2-3 parts of trichlorofluoromethane, 4-8 parts of sodium alcohol ether sulfate, 6-11 parts of aluminum borate crystal whisker, 12-14 parts of silicic acid hydrate, 9-15 parts of sodium antimonate, 3-8 parts of diisopropylamine and 7-11 parts of glyceryl tristearate. The sealing rubber strip of the automobile window is provided with bubbles inside and is good in elasticity, good in corrosion resistance and aging resistance, and long in service life.