Lg Chem, Ltd

Ulsan National Institute of Science and Technology

Lg Petrochemical Co., Ltd.

Unist, Inc.

Jong-Hyun Chae

Won-Ho Lee

Hyun-Kyung Yoon

Jang-Bae Kim

Sang-mun Jeong

Dong-Il Lee

Soo-Jin Park

Jun-Han Kang

Su-Hwan Kim

Ji-Hye Yang

In-kyu Park

Jong-suh Park

Jae-Geon Ryu

Keun-Hoo Park

Sang-Mun Jeong

Dong-il Lee

Young-Dae Kim

Seong-Hoon Kang

Sang-ku Park

Jun-han Kang

Dong-Ki Hong

Eui-Yong Hwang

Sang-Ku Park

The present disclosure relates to a negative electrode material including, as an active material, silicon flakes with a hyperporous structure, represented by the following chemical formula 1:Si.(1&#x2212;)A&#x2003;&#x2003;(1)

Negative electrode material comprising silicon flakes and preparing method of silicon flakes

A secondary battery using a vanadium oxide as a positive electrode active material is provided. The secondary battery is prevented from degradation of capacity by preventing dissolution of vanadium. The vanadium oxide includes secondary particles formed by assemblage of primary particles.

Lithium ion secondary battery

Provided are a catalyst for hydrocarbon steam cracking for light olefin production and a method for preparing the same. The catalyst is a simple KMgPOcatalyst, a supported KMgPOcatalyst, or a KMgPO-sintered catalyst. The supported KMgPOcatalyst is prepared by impregnating a carrier with an aqueous solution of a KMgPOprecursor and the KMgPO-sintered catalyst is prepared by mixing a KMgPOpowder or a KMgPOprecursor powder with metal oxide followed by sintering. Provided is also a method for producing light olefins such as ethylene and propylene by steam cracking in the presence of the catalyst. When the catalyst comprising KMgSOas a catalytic component is used in olefin production, the yield of olefins is increased and the amount of cokes deposited on the catalyst is reduced.

Hydrocarbon steam cracking catalyst, method for preparing the same and method for preparing light olefin by using the same

The present invention relates to a method and an apparatus for continuously separating aromatic dialdehyde from a reaction mixture obtained by gas-phase oxidation of dimethylbenzene. The method for continuously separating aromatic dialdehyde includes the steps of congealing aromatic dialdehyde by cooling the gas-phase reaction mixture including the aromatic dialdehyde, which is obtained by gas-phase oxidation of dimethylbenzene, to 5-70&#xb0; C. and separating the congealed aromatic dialdehyde from the remaining reaction mixture. Using the method and apparatus in accordance with the present invention, aromatic dialdehyde can be effectively and selectively separated from a reaction mixture obtained by gas-phase oxidation of dimethylbenzene in high yield.

Method and apparatus for separating aromatic dialdehyde

The present invention relates to a method for preparing high-purity terephthalaldehyde which comprises re-crystallizing terephthalaldehyde crystals containing impurities, using an anti-solvent. Specifically, the present invention relates to a method for preparing terephthalaldehyde which comprises dissolving low-purity terephthalaldehyde prepared by a conventional method in dimethylsulfoxide and then re-crystallizing the solution, using water as an anti-solvent. The present invention is not only environment-friendly because it uses water only as an anti-solvent, but also economical because it may simply prepare high-purity terephthalaldehyde in a short time.

Method for purifying terephthalaldehyde

The present invention relates to a method for preparing high-purity terephthalaldehyde from terephthalaldehyde crystal containing impurities by recrystallization using an antisolvent. Low-purity terephthalaldehyde prepared by a conventional method, which contains a small amount of impurities, is dissolved in a solvent and recrystallized using water as antisolvent to obtain high-purity terephthalaldehyde. The invention is significantly advantageous in using water only as antisolvent. Also, the purification process takes short time and is economical and environment-friendly.

Purification method of terephthal aldehyde

The present invention provides a pyrolysis tube for enhancing the yield of olefins and reducing a coking tendency in steam cracking of hydrocarbons. According to the present invention, the pyrolysis tube is characterized in that a plurality of mixing blades made by twisting two ends of a plate in opposite directions are included therein. The yield of ethylene is thereby improved and the coking tendency is reduced by mixing a fluid flow, improving a heat transfer rate and shortening a residence time of the reactants therein.

Pyrolysis tube and pyrolysis method for using the same

The present invention relates to a process for pyrolysis of hydrocarbons for olefin preparation, and particularly to a process for pyrolysis of hydrocarbons comprising pyrolyzing paraffin hydrocarbons in the presence of steam to prepare olefins, where the pyrolysis is conducted in a pyrolysis reaction tube in which a porous inorganic substance with a pore diameter of 1 &#x3bc;m&#x2dc;5 mm, a porosity of 10&#x2dc;80%, and a maximum specific surface area of 0.1 m/g is inserted or filled. According to the present invention, in the hydrocarbon pyrolysis process, the porous inorganic substance is inserted or filled into the pyrolysis reaction tube, and thus the olefin yield can be improved compared to the conventional pyrolysis processes, a continuous operation period can be prolonged, and a life cycle of the pyrolysis reaction tube can be prolonged.

Process for pyrolysis of hydrocarbon

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Daejeon, South Korea

Jong-Hyun Chae