摘要:
A method of producing 1,3-butadiene by the oxidative dehydrogenation of n-butene using a continuous-flow dual-bed reactor designed such that two kinds of catalysts charged in a fixed-bed reactor are not physically mixed. More particularly, a method of producing 1,3-butadiene by the oxidative dehydrogenation of n-butene using a C4 mixture including n-butene and n-butane as reactants and using a continuous-flow dual-bed reactor in which a multi-component bismuth molybdate catalyst and a zinc ferrite catalyst having different reaction activity in the oxidative dehydrogenation reaction of n-butene isomers (1-butene, trans-2-butene, cis-2-butene).
摘要:
A method of producing a mixed manganese ferrite catalyst, and a method of preparing 1,3-butadiene using the mixed manganese ferrite catalyst. Specifically, a method of producing a mixed manganese ferrite catalyst through a coprecipitation method which is performed at a temperature of 10˜40° C., and a method of preparing 1,3-butadiene using the mixed manganese ferrite catalyst through an oxidative dehydrogenation reaction, in which a C4 mixture containing n-butene, n-butane and other impurities is directly used as reactants without performing additional n-butane separation process or n-butene extraction. 1,3-butadiene can be prepared directly using a C4 mixture including n-butane at a high concentration as a reactant through an oxidative hydrogenation reaction without performing an additional n-butane separation process, and 1,3-butadiene, having high activity, can be also obtained in high yield for a long period of time.
摘要:
The present invention relates to an arylphenoxy catalyst system producing an ethylene homopolymer or copolymers of ethylene and α-olefins, and a method of producing an ethylene homopolymer or copolymers of ethylene and α-olefins having a high molecular weight under a high temperature solution polymerization condition using the same. The catalyst system includes a group IV arylphenoxy-based transition metal catalyst and an aluminoxane cocatalyst or a boron compound cocatalyst. In the transition metal catalyst, a cyclopentadiene derivative and arylphenoxide as fixed ligands are located around the group IV transition metal, arylphenoxide is substituted with at least one aryl derivative and is located at the ortho position thereof, and the ligands are not crosslinked to each other. The catalyst includes an environmentally-friendly raw material, synthesis of the catalyst is economical, and thermal stability of the catalyst is excellent. It is useful for producing an ethylene homopolymer or copolymers of ethylene and α-olefins having various physical properties in commercial polymerization processes.
摘要:
Provided is a make-up brush including a coating section for applying liquid cosmetic on a predetermined surface, the coating section having a plurality of bristles which forms a bundle, while being spaced at a predetermined distance from each other; a heat-bonded portion formed by melting one ends of the bristles such that the ends are integrally connected to each other; a housing section having such a cross-sectional shape that the end of the coating section having the heat-bonded portion is inserted and housed; a fixing section for fixing the end of the coating section, inserted into the housing section, to the housing section such that the density of the bristles is uniform; and a rod section connected to the housing section and having such a length that a user can hold the rod section by hand.
摘要:
An inkjet print head and a manufacturing method thereof capable of simplifying a manufacturing process without performing an additional process to form a heater layer that includes a substrate, a heating element stacked on the substrate to heat the ink, a transistor having a gate electrode to drive the heating element, a chamber layer to form an ink chamber filled with the ink above the heating element, and a nozzle layer stacked on the chamber layer to form a nozzle to eject the ink, wherein the gate electrode and the heating element include a metal silicide film formed through a salicide process.
摘要:
Disclosed is a catalytic cracking process for the production of light olefins from a hydrocarbon feedstock using fast fluidization, which is a preferred process for more efficiently increasing the production of light olefin hydrocarbons. According to this invention, a fast fluidization regime is applied to a fluidized bed catalytic cracking process of producing light olefins using zeolite, such that a volume fraction and distribution of the catalyst sufficient to induce the catalytic cracking reaction can be provided, thus effectively enhancing the production of light olefin hydrocarbons, in particular, ethylene and propylene, at high selectivity.
摘要:
The present invention provides Lactobacillus plantarum CJLP55 KCTC 11401BP, a composition for treating bowel disease containing the lactobacillus, and a composition for immunological enhancement containing the lactobacillus.
摘要:
Disclosed is a method of recovering 1,3-butadiene from a C4 stream containing butane, isobutane, 2-butene, 1-butene, isobutene, butadiene and acetylene. The process of recovering highly pure 1,3-butadiene includes acetylene conversion for selectively converting acetylene through liquid-phase hydrogenation, so that the acetylene content is decreased to 70 wt ppm or less, and 1,3-butadiene extraction using an extractive distillation column, a pre-separator, a solvent stripping column, a solvent recovery column, and a purification column. Through the acetylene conversion, the concentration of vinylacetylene is decreased to 70 wt ppm or less, after which 1,3-butadiene is recovered using only one extractive distillation column, thereby considerably decreasing the degree of utility and the loss of streams in the course of extraction. The number of units necessary for the process is decreased, thus remarkably reducing the time during which impurities can accumulate in a processing unit.
摘要:
An apparatus for generating superheated vapor using waste heat recovery. A housing has an inlet tank and an outlet tank at both ends. Exhaust gas is introduced through the inlet tank, and is discharged through the outlet tank. A plurality of wave fin structures are disposed inside the housing so as to be spaced apart from each other at predetermined distances in a top-bottom direction, and include a plurality of peaks and a plurality of valleys which are connected in a transverse direction so as to form wave-like structures in a direction in which the exhaust gas flows. A plurality of working fluid tubes alternate with the plurality of wave fin structures. An inlet pipe through which working fluid is introduced and an outlet pipe through which the working fluid is discharged are disposed on a side surface of the housing.
摘要:
The present invention relates to a bifunctional catalyst for a hydrodewaxing process with improved isomerization selectivity, and to a method for manufacturing the same, and more particularly to a bifunctional catalyst and to a method for manufacturing same, which is characterized in that EU-2 zeolite with a controlled degree of phase transformation is used as a catalyst support having an acid site. The EU-2 zeolite, the degree of phase transformation of which is controlled, includes, by controlling synthesis parameters of EU-2, predetermined amounts of materials that are phase-transformed from EU-2 crystals such as cristobalite and quartz. The metal loaded bifunctional catalyst according to the present invention improves selectivity of the isomerization process, rather than a cracking reaction, during a hydroisomerization reaction of n-hexadecane. Therefore, the bifunctional catalyst can be widely used as a catalyst for a dewaxing process such as lubricant base oil and diesel oil.