14 results about "Piperylene" patented technology

The application discloses a catalyst for preparing n-pentene by hydrogenation of piperylene, which comprises a carrier alpha-Al2O3 modified by a metal M, an active noble metal and a Lewis acid supported on the carrier alpha-Al2O3, wherein the active noble metal is Pd; the mass percentage of the metal M in the catalyst is 0.8-2% according to 100%, the metal M is at least one metal selected from W, V or Ga, the mass percentage of the active noble metal Pd is 0.05-0.08%, the mass percentage of the Lewis acid is 0.06-0.3%, and the rest is the carrier. In addition, the application also discloses a preparation method of the catalyst and application of the catalyst in production of n-pentene; and the catalyst can keep high catalytic activity and n-pentene selectivity in a long-time reaction process.

The present invention provides a preparation method of piperylene, belonging to the technical field of organic synthesis. In the present invention, liquid catechol is dropped into dichloromethane, and a cyclization reaction is carried out under the condition of a pressure of 0.7-1.0 Mpa. The obtained reaction product is successively subjected to liquid separation and rectification to obtain piperylene; the cyclization reaction is carried out under stirring conditions, and the rotation speed of the stirring is 350-550 r / min. In the reaction process of the present invention, no third substance is introduced, the separation of materials after the reaction is simple, the hydrogen chloride generated can be recycled, basically no waste water and waste salt are generated, there is no waste water treatment cost, the environmental protection treatment cost is reduced, no secondary pollutants are generated, and clean production is achieved.

The utility model provides a heliotropin purification system. The heliotropin purification system comprises a normal-pressure distillation device, a first negative-pressure rectification device, a second negative-pressure rectification device and a solvent circulation pipeline which are communicated in sequence, the first negative pressure rectification device comprises a first rectification tower, a first condenser, a first reflux tank, a first circulating pump and a first reboiler; the second negative pressure rectification device comprises a second rectification tower, a second condenser, a second reflux tank, a second circulating pump and a second reboiler; a feed port of the second rectification tower is communicated with a bottom discharge port of the first rectification tower through a second rectification pump; the solvent circulating pipeline comprises a benzodioxole circulating pipeline and a front distillation mixture pipeline, the inlet end of the benzodioxole circulating pipeline is communicated with the benzodioxole storage tank, the outlet end of the benzodioxole circulating pipeline is communicated with the heliotropin condensation reaction device, and the inlet end of the front distillation mixture pipeline is communicated with the front distillation mixture storage tank; and the outlet end of the front distillation mixture pipeline is communicated with the feeding hole of the first rectifying tower. According to the invention, efficient rectification of heliotropin is realized.

The invention discloses a method for refining polymer-grade m-pentadiene. The method comprises the following steps: carrying out selective hydrogenation reaction on a crude m-pentadiene material to remove alkyne so as to obtain an alkyne-removed m-pentadiene intermediate material; mixing the deacetylated m-pentadiene intermediate material with cyclic ketone, alcohol and organic alkali, and carrying out reactive distillation to remove cyclopentadiene so as to obtain decyclized m-pentadiene; and refining and purifying the decyclized m-pentadiene through water washing and extractive distillation to obtain the decyclized m-pentadiene. The obtained polymer-grade pentadiene product is high in purity, the content of impurity cyclopentadiene in the polymer-grade pentadiene product is lower than 1ppm, and the content of impurity alkyne in the polymer-grade pentadiene product is lower than 20ppm.

The present invention relates to the field of thermoplastic elastomers, disclose styrene-piperylene-styrene block copolymer and its synthesis method and application, in the styrene-piperylene-styrene block copolymer (SPS), the content of 1,2 structures is 20-50 weight %. Compared to SBS and SIS, the SPS has the advantages of high anti-1,4 structures, high branching degree, high hardness, high elasticity low plasticity and high coupling efficiency. The present invention uses the initiation system consisting of organic lithium and tetrahydrofuran-based compounds, not only can SPS branching 1,2 structures be regulated, while polymerization rate can be improved, and the normal progress of subsequent coupling reaction can also be ensured without carrying out temperature control to polymerization process. The use of tetrahydrofuran-based compounds can greatly reduce SPS single kettle polymerization time, contributes to reducing energy consumption, material consumption, while polymerization process microstructure regulation stability is excellent, with great industrial application prospects.

The invention relates to the technical field of petrochemical engineering, and discloses an efficient pentadiene extraction and purification method and system, and the method comprises the following steps: screening out an effective solvent combination of pentadiene and other impurities, and arranging an automatic solvent extraction device of pentadiene and other impurities according to the extractable degree of the effective solvent combination to other impurities; the method comprises the following steps: collecting gas-liquid equilibrium data of m-pentadiene and other impurities, and setting gradient rectification temperatures of m-pentadiene and other impurities in combination with pyrolysis characteristics; the method comprises the following steps: configuring an efficient rectification separator for m-pentadiene and other impurities to obtain primarily purified m-pentadiene; detecting residual impurities of the primarily purified m-pentadiene, and creating a dynamic rectification switching mechanism and an impurity recovery unit of the m-pentadiene; in combination with an automatic solvent extraction device, an efficient rectification separator, an impurity recovery unit and a dynamic rectification switching mechanism, efficient extraction and purification treatment of m-pentadiene is executed. According to the method, the purity and the yield of the m-pentadiene can be improved.

The present application relates to a kind of methyl tetrahydrophthalic anhydride continuous production process and device, the present application adopts piperylene segmented feed, isoprene is first with a part of piperylene and maleic anhydride pre-synthesis reaction at low temperature, then continue to react with another part of piperylene at higher temperature, reduce isoprene self-polymerization, using column tube heat exchanger to improve synthesis efficiency, heater and mixer are set on external circulation pipeline to carry out temperature control to reactor, using the method that reactor synthesis product carries fresh raw material and circulates into reactor to prevent fresh carbon five and anhydride aggregation self-polymerization to reduce side reaction, no high polymer slag is generated.

The utility model provides a recovery and cyclic utilization system of industrial strong brine for benzodioxole production, which belongs to the technical field of benzodioxole production and wastewater treatment, and comprises a distillation kettle, a material inlet at the top of the distillation kettle is connected with a strong brine collecting tank, and a gas phase outlet at the top of the distillation kettle is connected with a gas phase inlet at the bottom of a packed tower; a purified gas outlet in the top of the packed tower is connected with a material inlet of the condenser, and a material outlet of the condenser is connected with an inlet of the water receiving tank; an outlet of the water receiving tank is respectively connected with the alkali preparation process, the water washing process and the circulating water tank through pipelines; a material outlet at the bottom of the distillation kettle is connected with a material inlet of the centrifuge, a material outlet of the centrifuge is connected with an inlet of the dryer, an outlet of the dryer is connected with the packaging machine, and the packaging machine is connected with the byproduct warehouse. According to the system, sodium chloride and water in the strong brine generated in the production of the benzodioxole are recycled, so that the sewage discharge amount and the sewage treatment amount are remarkably reduced, and the sewage treatment cost and the production cost are reduced.

The invention provides a comprehensive utilization method of m-pentadiene, and relates to the technical field of resource utilization, and the method comprises the following steps: S1, carrying out selective hydrogenation on m-pentadiene as a raw material under the action of a catalyst to generate n-pentene and 2-pentene; s2, the pentene prepared in the step S1 and synthesis gas are subjected to a carbonyl synthesis reaction under the action of a rhodium catalyst and a carrier to generate n-hexanal and iso-hexanal, the n-hexanal and the iso-hexanal are mixed and then hydrogenated, and n-hexanol and iso-hexanol are prepared; and S3, carrying out carbon-carbon double bond nucleophilic addition on n-hexanal and iso-hexanal prepared in the step S2 under the action of a basic catalyst, then carrying out deprotonation on hydroxyl to generate dodecenal, and finally carrying out hydrogenation on the generated dodecenal to prepare the isododecanol. The invention provides a new method for comprehensively utilizing the m-pentadiene, which not only opens up a new production line for comprehensively utilizing the m-pentadiene, but also utilizes the m-pentadiene as a raw material to produce different new material chemicals with high added values, thereby greatly enhancing the utilization value of the m-pentadiene.

The present invention provides a catalyst for selectively hydrogenating and removing alkynes and cyclopentadiene in piperylene and a preparation method thereof. The preparation method includes the following steps: (1) Prepare an aqueous solution containing a palladium compound, add potassium chloride thereto to obtain solution A, then add ethanol and a nonionic surfactant to solution A, and stir for a period of time at a certain temperature to obtain solution B; (2) Suspend SiO2 in water, add a certain amount of an amphoteric surfactant to obtain suspension C; (3) Dropwise add solution B to suspension C, and stir for a period of time at a certain temperature to obtain suspension D; (4) Prepare an aqueous solution containing a copper compound, add a certain amount of a precipitant, and stir for a period of time at a certain temperature to obtain turbid solution E; (5) Dropwise add turbid solution E to suspension D, stir for a period of time at a certain temperature, then filter, wash, dry, and calcine to obtain an oxidized catalyst; (6) Reduce the oxidized catalyst to obtain a catalyst for selectively hydrogenating and removing alkynes and cyclopentadiene in piperylene. The catalyst prepared by the present invention is applicable to the removal of a small amount of alkynes and cyclopentadiene in piperylene, and is particularly applicable to the selective hydrogenation and removal of a small amount of alkynes and cyclopentadiene in piperylene by-produced in the ethylene production unit by naphtha cracking. The purified piperylene can be directly used for polymerizing to produce resins and rubbers.

The application belongs to the technical field of petroleum resin, and provides a preparation method of C5 petroleum resin, which comprises the following steps: S1, 3.2-3.5 g of a catalyst and 160-175 g of a functional reagent are added into a reactor and heated in a 50 DEG C water bath; when the temperature reaches 45 DEG C, a mixed solution is added dropwise into the reactor, and constant temperature is maintained to obtain a base resin solution; the mass of the catalyst is 1.2-1.5% of the mass of the mixed solution; the mixed solution is composed of piperylene and alpha-methylstyrene, and the mass of the alpha-methylstyrene is 10.7-11.2% of the mass of the mixed solution; the functional reagent is prepared by dissolving hydrogenated rosin glyceride in a solvent; S2, after the base resin is sequentially subjected to alkali washing and water washing, an antioxidant is added to obtain an intermediate resin solution; and S3, the intermediate resin solution is subjected to distillation, and the C5 petroleum resin is obtained.

A preparation method of C5 petroleum resin comprises the following steps: First, concentrated piperylene, a part of solvent, monoolefin, dicyclopentadiene, α-pinene, and styrene monomers are mixed evenly and placed in a raw material tank to obtain reaction materials; Second, the remaining solvent is added into a reaction kettle, the temperature is raised to 50°C - 60°C under stirring, then a catalyst is added, and then the reaction materials obtained in the first step are added at a rate of 20 g / min for reaction. During the feeding process, the reaction temperature in the reaction kettle is controlled at 50°C - 60°C; Third, after the reaction materials are added, the reaction continues for 10 min - 15 min at the reaction temperature of 50°C - 60°C, the temperature is lowered and the product is discharged to obtain a reaction solution, and the reaction solution is post-treated to obtain C5 petroleum resin. Compared with the prior art, the resin prepared by the present invention has a high softening point and can reduce insoluble matters.

This invention discloses a transparent, fully hydrogenated polystyrene-isoprene resin and its preparation method, which is obtained by the complete hydrogenation of the following block copolymer: wherein S1 and S2 are styrene homopolymer blocks, and SP is a styrene and isoprene alternating copolymer block, and the hydrogenation rate of both the benzene ring unit and the isoprene unit in the block copolymer is greater than 99%. This resin exhibits good chemical stability, UV resistance, heat resistance, weather resistance, ozone resistance, as well as high toughness and high strength, making it particularly suitable for the preparation of optical, electronic, transportation, remote sensing scientific and technological equipment, packaging materials, and instrument panels.

The present invention provides a catalyst for selectively hydrogenating and removing alkynes from isoprene and a preparation method thereof. The preparation method comprises the following steps: (1) Prepare an aqueous solution containing a palladium compound, add potassium chloride thereto to obtain solution A, then add a diol to solution A and stir for a certain period of time at a certain temperature to obtain solution B; (2) Suspend SiO2 in solution B and stir for a certain period of time at a certain temperature to obtain suspension C; (3) Prepare an aqueous solution containing a nickel compound, add a certain amount of an anionic surfactant, and stir for a certain period of time at a certain temperature to obtain turbid liquid D; (4) Dropwise add turbid liquid D to suspension C, stir for a certain period of time at a certain temperature, then filter, wash, dry, and calcine to obtain an oxidized catalyst; (5) Reduce the oxidized catalyst to obtain a catalyst for selectively hydrogenating and removing alkynes from isoprene. The catalyst prepared by the present invention is suitable for removing a small amount of alkynes from isoprene, especially for selectively hydrogenating and removing a small amount of alkynes from the by-product isoprene in the ethylene production unit by naphtha cracking. The purified isoprene can be directly used for polymerizing to produce resins and rubbers.