Lg Chem, Ltd

Hoi In Jeong

Jeong Seok Lee

Jun Seok Ko

Jong Ku Lee

Woo Sung Hwang

Dong Min Kim

Mi Kyung Kim

Hyung Sub Lee

Min Cheol Ju

Chang Sull Kim

Su Ji Yoon

A method of separating an organic solvent which may easily separate and recover an organic solvent from a mixed solution containing the organic solvent, and an organic solvent separation system capable of performing the same are disclosed herein. In some embodiments, the method includes introducing a first mixed solution into a first distillation column to recover an organic solvent and discharge a first fraction containing an unrecovered organic solvent and a high boiling point compound A to a bottom of the column, introducing a second mixed solution into a second distillation column to recover organic solvent and discharge a second fraction containing an unrecovered organic solvent and a high boiling point compound B, and introducing the first fraction and the second fraction into a third distillation column to recover an organic solvent-rich fraction and a high boiling point compound-rich fraction.

Method of separating organic solvent from mixed solution containing the organic solvent

A method of preparing a conjugated diene-based polymer is provided. The method includes: adding a conjugated diene-based monomer, a catalyst, and a solvent to parallel polymerization reactors, performing a polymerization reaction to prepare a first polymer solution including a first conjugated diene-based polymer; and adding the first polymer solution to a polymerization reactor connected in series to the parallel polymerization reactors, performing the polymerization reaction to prepare a second polymer solution including a second conjugated diene-based polymer. After the polymerization reaction in the series polymerization reactor, gas produced by polymerization heat is condensed in the series polymerization reactor and refluxed to the parallel polymerization reactors, and a reaction temperature of the series polymerization reactor is maintained to be lower than a reaction temperature of the parallel polymerization reactors by 10&#xb0; C. or more.

Method of preparing conjugated diene-based polymer and apparatus for preparing conjugated diene-based polymer

A method of preparing a conjugated diene-based polymer is provided including: a step of polymerizing a first conjugated diene-based monomer in solution in a first polymerization reactor to prepare a first polymer solution including a first conjugated diene-based polymer; a step of polymerizing a second conjugated diene-based monomer in solution in a second polymerization reactor to prepare a second polymer solution including a second conjugated diene-based polymer; a step of supplying a first fluid separated from the first polymer solution to a first purification unit and purifying the first fluid; and a step of supplying a second fluid separated from the second polymer solution to a second purification unit and purifying the second fluid. An apparatus for preparing a conjugated diene-based polymer is also provided.

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.

Separation method and separation process system for recovering ethylene

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.

Provided is a method of preparing polybutadiene which may improve productivity by minimizing a plugging phenomenon during the preparation of polybutadiene and increasing a conversion rate.

Method of preparing polybutadiene

Provided is an apparatus for preparing polybutadiene which may improve productivity by minimizing a plugging phenomenon during the preparation of polybutadiene and increasing a conversion rate.

Apparatus for preparing polybutadiene

Disclosed are an apparatus for preparing a polymer latex resin powder in which an efficiency of mixing of steam, a latex, and a coagulant is increased by introducing a non-continuous screw into a reactor that performs coagulation and aging and thus a moisture content of a slurry is decreased and, accordingly, drying efficiency may be enhanced, and a polymer latex resin powder with excellent color and powder characteristics may be prepared using a decreased amount of coagulant and a method of preparing a polymer latex resin powder by using the same.

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Daejeon, South Korea

Hoi In Jeong