Korea Research Institute of Chemical Technology

Lotte Chemical Corporation

Sk Energy Co., Ltd.

Sk Innovation Co., Ltd.

Sk Innovation., Ltd.

Hee Young Kim

Yong Ki Park

Won Choon Choi

Kyung Koo Yoon

Sun Woong Choi

Deuk Soo Park

Chul Wee Lee

Suk Joon Kim

Tae Jin Kim

Na Young Kang

Yong Seung Kim

Seung Woong Yoon

Jae Seung Lee

Dae Hyun Choo

Yong Mann Song

Dae Heok Kwon

Jong Y Jeon

Bu Sub Song

Kang M Lee

Seung Hoon Oh

Ji Min Kim

Sang Jin Moon

Hong Chan Kim

Ahn Seop Choi

Dong Soon Park

Min Jae Shin

Il Mo Yang

Sang Yun Han

Jeong Ri Kim

Kwang An Ko

Sung Wuk Kim

Won Wook So

Young Ki Park

Disclosed are a catalyst system capable of selectively oligomerizing olefins including ethylene and a method for preparing an olefin oligomer by using the same and, specifically, a novel catalyst system capable of trimerizing and tetramerizing olefins, unlike olefin oligomerization catalyst systems that have been reported so far, and a method for preparing an olefin oligomer by using the same. The present invention provides a catalyst system for olefin oligomerization, the catalyst system comprising: a ligand compound represented by chemical formula 1; a chromium compound; a metal alkyl compound; and an aliphatic or alicyclic hydrocarbon solvent.

Catalyst system for olefin oligomerization and method for preparing olefin oligomer by using same

Disclosed are a catalyst system capable of selectively oligomerizing olefins including ethylene and a method for preparing an olefin oligomer by using the same and, specifically, a novel catalyst system capable of trimerizing and tetramerizing olefins, unlike olefin oligomerization catalyst systems that have been reported so far, and a method for preparing an olefin oligomer by using the same. The present invention provides a catalyst system for olefin oligomerization, the catalyst system comprising: a ligand compound represented by chemical formula 1 or 2; a chromium compound; a metal alkyl compound; and an aliphatic or alicyclic hydrocarbon solvent.

Disclosed are a novel catalyst system which is a catalyst system for selectively oligomerizing olefin including ethylene and may trimerize and tetramerize olefin, different from the catalyst system for olefin oligomerization reported until now, and a method for preparing an olefin oligomer using same. The present invention provides a catalyst system for olefin oligomerization, including a ligand compound represented by Formula 1; a chromium compound; and a metal alkyl compound, and a method for preparing an olefin oligomer using same.

Catalyst system for olefin oligomerization and method for preparing olefin oligomer using same

Disclosed are a novel catalyst system which is a catalyst system for selectively oligomerizing olefin including ethylene and may trimerize and tetramerize olefin, different from the catalyst system for olefin oligomerization reported until now, and a method for preparing an olefin oligomer using same. The present invention provides a catalyst system for olefin oligomerization, including a ligand compound represented by Formula 1 or 2; a chromium compound; and a metal alkyl compound, and a method for preparing an olefin oligomer using same.

A process for preparing granular polysilicon using a fluidized bed reactor is disclosed. The upper and lower spaces of the bed are defined as a reaction zone and a heating zone, respectively, with the height of the reaction gas outlet being selected as the reference height. The invention maximizes the reactor productivity by sufficiently providing the heat required and stably maintaining the reaction temperature in the reaction zone, without impairing the mechanical stability of the fluidized bed reactor. This is achieved through electrical resistance heating in the heating zone where an internal heater is installed in a space in between the reaction gas supplying means and the inner wall of the reactor tube, thereby heating the fluidizing gas and the silicon particles in the heating zone. The heat generated in the heating zone is transferred to the reaction zone by supplying the fluidizing gas at such a rate that the silicon particles can be intermixed between the reaction zone and the heating zone in a continuous, fluidized state.

Method and apparatus for preparation of granular polysilicon

Disclosed are a molecular sieve catalyst and a preparation method thereof to produce light olefins from cracking naphtha catalytically in severe environments of high temperature and high moisture. In detail, the catalyst is prepared by spray-drying and calcining the mixed slurry, in which 0.01&#x2dc;5.0 wt % of MnOand 1&#x2dc;15 wt % of POare simultaneously imbedded in catalyst which consists of zeolite, clay and inorganic complex. According to the present invention, the method that manganese and phosphate are imbedded simultaneously in zeolite and inorganic complex is used to increases thermal-stability of obtained spherical catalyst, and increase olefin yield of cracking hydrocarbon such as naphtha by protecting acid-site of zeolite. To synthesize the required catalyst, the important procedures are mixing ratio and mixing sequence of Mn, P, zeolite, and inorganic complex.

Catalyst for catalytic cracking of hydrocarbon, which is used in production of light olefin and production method thereof

A method of preparing ZSM-5, including: providing a nanocrystalline ZSM-5 seed having a size of 70-150 nm; adding the nanocrystalline ZSM-5 seed to a stock solution including water glass as a silica source, an alumina source, a neutralizer and water to form a reaction mixture; and maintaining the reaction mixture at 150-200&#xb0; C. to crystallize the reaction mixture. The method is advantageous in that ZSM-5 having small and uniform crystal sizes and including no impurities can be synthesized in a short period of time.

Method of preparing ZSM-5 zeolite using nanocrystalline ZSM-5 seeds

An apparatus for preparing granular polysilicon comprises a reactor tube, a reactor shell, an internal heater, and components for controlling pressure, supplying a fluidizing gas and a reaction gas, discharging gas, and discharging particles. The reactor tube is associated with an inner space comprising an inner zone that contains a bed of silicon particles and is the site at which silicon deposition occurs. The inner zone comprises a heating zone and a reaction zone. The fluidizing gas supplying component supplies a fluidizing gas for fluidizing the bed of silicon particles to a bottom of the heating zone. The apparatus can minimize the problems occurring during the heating of silicon particles at high temperature for silicon deposition on the surface of the silicon particles.

A process for preparing granular polysilicon using a fluidized bed reactor is disclosed. Upper and lower spaces of the bed are the reaction zone and heating zone, respectively, wherein the height of the reaction gas outlet is the reference height. Reactor productivity is maximized by sufficiently providing the heat required and stably maintaining the reaction temperature in the reaction zone, without impairing the mechanical stability of the fluidized bed reactor. This is achieved through electrical resistance heating in the heating zone where an internal heater is installed between the reaction gas supplying means and the inner wall of the reactor tube, thereby heating the fluidizing gas and the silicon particles in the heating zone. The heat generated is transferred to the reaction zone by supplying the fluidizing gas at a rate silicon particles can be intermixed between the reaction zone and the heating zone in a continuous, fluidized state.

Disclosed are a method and an apparatus for preparing a polycrystalline silicon rod using a mixed core means, comprising: installing a first core means made of a resistive material together with a second core means made of silicon material in an inner space of a deposition reactor; electrically heating the first core means and pre-heating the second core by the first core means which is electrically heated; electrically heating the preheated second core means; and supplying a reaction gas into the inner space in a state where the first core means and the second core means are electrically heated for silicon deposition.

Apparatus and methods for preparation of high-purity silicon rods using mixed core means

There is provided a method for continual preparation of granular polycrystalline silicon using a fluidized bed reactor, enabling a stable, long-term operation of the reactor by effective removal of silicon deposit accumulated on the inner wall of the reactor tube. The method comprises (i) a silicon particle preparation step, wherein silicon deposition occurs on the surface of the silicon particles, while silicon deposit is accumulated on the inner wall of the reactor tube encompassing the reaction zone; (ii) a silicon particle partial discharging step, wherein a part of the silicon particles remaining inside the reactor tube is discharged out of the fluidized bed reactor so that the height of the bed of the silicon particles does not exceed the height of the reaction gas outlet; and (iii) a silicon deposit removal step, wherein the silicon deposit is removed by supplying an etching gas into the reaction zone.

Method for continual preparation of polycrystalline silicon using a fluidized bed reactor

A method for preparing a polysilicon rod using a metallic core means, including: installing a core means in an inner space of a deposition reactor used for preparing a silicon rod, the core means being constituted by forming at least one separation layer on the surface of a metallic core element and being connected to an electrode means, heating the core means by supplying electricity through the electrode means, and supplying a reaction gas into the inner space for silicon deposition, thereby forming a deposition output in an outward direction on the surface of the core means. The deposition output and the core means can be separated easily from the silicon rod output obtained by the process of silicon deposition, and the contamination of the deposition output caused by impurities of the metallic core element can be minimized, thereby a high-purity silicon can be prepared more economically and conveniently.

Methods for preparation of high-purity polysilicon rods using a metallic core means

The present invention relates to a high-pressure fluidized bed reactor for preparing granular polycrystalline silicon, comprising (a) a reactor tube, (b) a reactor shell encompassing the reactor tube, (c) an inner zone formed within the reactor tube, where a silicon particle bed is formed and silicon deposition occurs, and an outer zone formed in between the reactor shell and the reactor tube, which is maintained under the inert gas atmosphere, and (d) a controlling means to keep the difference between pressures in the inner zone and the outer zone being maintained within the range of 0 to 1 bar, thereby enabling to maintain physical stability of the reactor tube and efficiently prepare granular polycrystalline silicon even at relatively high reaction pressure.

Growing community of inventors

Daejeon, South Korea

Hee Young Kim