Abstract: The present invention relates to a method of preparing butadiene and a device for preparing the same. According to the present invention, when butadiene is prepared by oxidative dehydrogenation of butene, unlike conventional methods, in which nitrogen is used as a diluent gas and an absorption method is used to separate butadiene from reaction products, butane is used as a diluent gas and a condensation method, in which butadiene is liquefied and separated from reaction products using a low-temperature refrigerant or cooling water, is used. In addition, an absorption method of recovering all hydrocarbons from an upper stream generated in a condensation process is used, so that loss of hydrocarbons is minimized. Therefore, the method and device of the present invention may provide high-purity butadiene while reducing raw material costs, production costs, and energy consumption, thereby improving economic efficiency of processes.

Abstract: An electronic device is provided. The electronic device outputs a user interface (UI) including at least one object, receives a pressure input of a specified level or more for selecting the object, verifies information associated with an object selected by the pressure input, outputs vibration feedback of a first frequency or first amplitude if the information associated with the object is less than a first criterion, and outputs vibration feedback of a second frequency relatively lower than the first frequency or second amplitude higher than the first amplitude if the information associated with the object is greater than or equal to the first criterion.

Abstract: A method for producing a glass article is provided. The method for producing a glass article, the method including preparing a glass to be processed, the glass comprising a glass bulk and a low-refractive surface layer disposed on the glass bulk, and etching away the low-refractive surface layer to form an etched glass, wherein the etching away the low-refractive surface layer comprises: cleaning the low-refractive surface layer with an acid solution; and cleaning the low-refractive surface layer with a base solution after the cleaning it with the acid solution.

Abstract: The present invention relates to a separation method and a separation process system for easily recovering ethanol from an ethanol oligomerization reactant containing unreacted ethanol. A separation method according to the present invention may improve the economics and increase separation efficiency by easily refluxing ethylene while reducing or excluding the use of a reflux system which uses an expensive cooling medium, and the like, and may also improve process efficiency by reducing the amount of heat used by a reboiler.

Abstract: The present invention relates to energy saving method and apparatus for preparing styrene and alpha-methylstyrene concurrently, by which economic feasibility may be improved by reusing energy during preparing styrene and alpha-methylstyrene concurrently.

Abstract: The present invention relates to a separation method and a separation process system for easily recovering ethanol from an ethanol oligomerization reactant containing unreacted ethanol. A separation method according to the present invention may easily reflux ethylene while reducing or excluding the use of a reflux system which uses an expensive cooling medium, and the like, and thus may improve the economics while increasing separation efficiency.

Abstract: Provided are a separation system for easily recovering normal butene from an olefin fraction including isobutene, isobutane, 1-butene, 2-butene, and normal butane, and a separation process system using the method. Since the separation system may easily convert 1-butene included in the olefin fraction to 2-butene, normal butene may be effectively separated and recovered by factional distillation and each recovered fraction may be easily refluxed even if the use of a reflux system using a refrigerant is reduced or excluded. Thus, economic efficiency may be improved and simultaneously, separation efficiency may be increased.

Abstract: Provided are a separation system for easily recovering normal butene from an olefin fraction including isobutene, isobutane, 1-butene, 2-butene, and normal butane, and a separation process system using the method. Since the separation system may easily convert 1-butene included in the olefin fraction to 2-butene, normal butene may be effectively separated and recovered by factional distillation and each recovered fraction may be easily refluxed even if the use of a reflux system using a refrigerant is reduced or excluded. Thus, economic efficiency may be improved and simultaneously, separation efficiency may be increased.

Abstract: A method of preparing butadiene and a device for preparing the same. The method includes passing reaction raw materials containing butene, oxygen, steam, and a diluent gas through an oxidative dehydrogenation reactor, and oxidative dehydrogenation is performed therein to produce a reaction product separating water from the reaction product condensing hydrocarbons to produce a crude hydrocarbon mixture; and separating butadiene from the crude hydrocarbon mixture, where a gas containing n-butane remaining after the butadiene is separated is fed into the oxidative dehydrogenation reactor, and butane is used as a diluent gas. Because butane is used as a diluent gas, a C4 mixture and gas products may be easily separated through cooling and condensation processes. Thus, the method may increase productivity while reducing energy consumption and raw material costs, thereby improving economic efficiency.

Abstract: The present invention relates to a method for preparing a polyetherester copolymer having excellent economical efficiency by recycling unreacted diol and excellent physical properties. Accordingly, the preparation method may prepare a polyetherester copolymer of high purity having excellent economical efficiency by purifying a byproduct to separate a recycle stream including unreacted diol therefrom, and reusing the recycle stream.

Abstract: The present disclosure relates to a method for preparing polybutylene terephthalate, and the method for preparing polybutylene terephthalate of the present disclosure recycles the recovered 1,4-butanediol, so the condensation efficiency in the condenser is not lowered. Therefore, the degree of vacuum of the polycondensation reactor is maintained, so that the preparation efficiency and the degree of polymerization of polybutylene terephthalate can be increased.

Abstract: The present specification provides a ferrite catalyst, a method for preparing the same and a method for preparing butadiene using the same.

Abstract: A resonant wireless power reception apparatus includes a wireless near field communication (NFC) antenna for performing an NFC function through an NFC frequency band, a resonator for receiving resonant wireless power using a resonance frequency different from the NFC frequency band, the resonator being installed adjacent to the NFC antenna, and a high impedance circuit for filtering a signal having the NFC frequency band provided from the NFC antenna, the high impedance circuit being connected to the resonator.

Abstract: Provided are a separation method for easily recovering normal butene from an olefin fraction including isobutene, isobutane, 1-butene, 2-butene, and normal butane, and a separation process system using the method. Since the separation method according to the present invention may easily convert 1-butene included in the olefin fraction to 2-butene, normal butene may be effectively separated and recovered by factional distillation and each recovered fraction may be easily refluxed even if the use of a reflux system using a refrigerant is reduced or excluded. Thus, economic efficiency may be improved and simultaneously, separation efficiency may be increased.

Abstract: A fuel-mixing prevention filler neck device is provided. The fuel-mixing prevention filler neck device includes a fuel dispensing gun insertion unit that receives a fuel dispensing thereinto and a coupling unit that provides fluid communication with a bottom of the fuel dispensing gun insertion unit. The coupling unit is disposed on an exterior circumferential surface thereof with coupling protrusions for fastening with a plurality of slots formed in a filler pipe. Further, a first side of a lower portion of the coupling unit is open to form a coupling region. A misfueling prevention unit slidably moves to the coupling region to be coupled to the coupling unit. Additionally, the misfueling prevention unit is closed when a gasoline fuel dispensing gun is inserted and being opened when a diesel fuel dispensing gun is inserted.

Abstract: The present invention relates to a method of preparing butadiene and a device for preparing the same. According to the present invention, since butane is used as a diluent gas, even when a refrigerant belonging to a grade lower than a very low temperature refrigerant is used, a C4 mixture and gas products excluding butadiene may be easily separated, and loss of active ingredients may be minimized, which may increase productivity while reducing raw material costs, thereby improving economic efficiency. In addition to these advantages, when the method and device of the present invention are used, high-purity butadiene may be safely prepared.

Abstract: The present invention relates to energy saving method and apparatus for preparing styrene and alpha-methylstyrene concurrently, by which economic feasibility may be improved by reusing energy during preparing styrene and alpha-methylstyrene concurrently.

Abstract: According to an exemplary embodiment of the present disclosure, a method of manufacturing a display window includes preparing a mother substrate, performing a salt treatment on the mother substrate to form a silicon-rich layer in a surface of the mother substrate to a first depth from the surface of the mother substrate, and removing the silicon-rich layer, wherein the first depth is greater than a depth of any cracks in the surface of the mother substrate, and a ratio of silicon content in the silicon-rich layer to a silicon content in the mother substrate is 1.2 to 1.4.

Abstract: Disclosed is a method of separating an ethylene oligomerization effluent, in which, during the separation and purification of a product obtained through ethylene oligomerization, the temperature of the reaction product is adjusted and used, thus improving energy efficiency.

Abstract: Provided is a method for recycling energy in process of butadiene preparation, which includes, in the process of preparing butadiene using oxidative dehydrogenation reaction, steps of: a) supplying part or all of a light gas discharged from a solvent absorption tower to a turbine to produce electricity; b) passing the light gas passed through the turbine through one or more device units provided with a heat exchanger; and c) feeding the light gas passed through the device units provided with the heat exchanger into a reactor, according to which more economical butadiene preparation process is provided, by reducing net energy value required in process of butadiene preparation using oxidative dehydrogenation reaction.