Lg Chem, Ltd

Jun Seok Ko

Kyoung Su Ha

Seong Pil Kang

Boo Gon Woo

Young Bae Kim

Seok Hwan Choi

Hoi In Jeong

Woo Sung Hwang

Jeong Seok Lee

Sung Ho Park

Sung Cheol Yoon

Sun Keun Kim

Soo Young Choi

Dong Min Kim

Suk Yung Oh

No Ma Kim

Jong Ku Lee

Sang Eun Park

Yong Heon Cho

Jin Young Kim

Joon Ho Shin

Sung Hwan Kim

Sang Mi Lee

Se Won Baek

Sung Soo Park

Jung Su Han

Ro Mi Lee

Sang Youn Lee

Yu Jin Kim

Byung Yul Choi

Hyun Jong Shin

He Seung Lee

Hae Sung Sohn

Tae Chul Lee

Seung Whan Oh

Su Hwa Kim

Ki Seok Son

Young Hyun Choe

Se Kyung Lee

Sang Cheol Shin

Eun Ju Kim

Sang Hun Jeon

Seok Kwan Choi

Min Jeong Park

Su Ji Yoon

Kwan Sik Kim

Byeong Gil Lyu

Nam Young Yoon

Joo Sik Oh

Kyeong Hyeon Jo

Tae Chui Lee

Junghoon Chang

A method for purifying of waste water includes: supplying a mixed stream, in which wastewater including water, a nitrile-based monomer, and ammonia and an acid component are mixed, to a first column; condensing an upper discharge stream of the first column, supplying the condensed stream to a decanter to separate the stream into a water layer and an organic layer, and supplying components of the organic layer to a second column; and separating a by-product from a lower discharge stream of the second column, and recovering the nitrile-based monomer from an upper discharge stream of the second column.

Method for purifying of waste water

Provided is a wastewater purification method, the method including: supplying a first mixed stream, in which an acid component and wastewater including water, a nitrile-based monomer, and ammonia are mixed, to a first column; recovering the nitrile-based monomer from an upper discharge stream from the first column; supplying a second mixed stream, in which a lower discharge stream from the first column and a base component are mixed, to a second column; and recovering the ammonia from an upper discharge stream from the second column and separating purified wastewater.

Wastewater purification method

A continuous preparation system of a conjugated diene-based polymer having improved rolling resistance properties is provided. By utilizing the continuous preparation system a polymerization conversion ratio at an initial stage of polymerization is easy to control, long time operation is possible and productivity is excellent.

Continuous preparation system of conjugated diene-based polymer

A method of recovering a solvent including: supplying polymerization reactants including one or more monomers and a solvent to a reactor to obtain a polymer solution; supplying a stream including the polymer solution to a separator to separate an upper discharge stream including the solvent, wherein the solvent is in a gaseous phase, and a lower discharge stream including the polymer solution; heating a divergence stream including a part of the lower discharge stream from the separator by a heating device and refluxing the divergence stream to the separator; supplying a residue stream including a remainder of the lower discharge stream from the separator to a steam stripping process unit; and adjusting a vapor mass fraction of the divergence stream which is refluxed to the separator with a pressure adjustment valve after being heated by the heating device.

Method of recovering solvent and solvent recovery apparatus

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 method for preparing a modified conjugated diene-based polymer, and more particularly, provides a method for preparing a modified conjugated diene-based polymer including a step of polymerizing a conjugated diene-based monomer in the presence of an organometal compound in a hydrocarbon solvent to prepare an active polymer which is coupled with an organometal (S1); and a step of reacting or coupling the active polymer prepared in step (S1) with a modifier (S2), wherein step (S1) is continuously performed in two or more polymerization reactors, and a polymerization conversion ratio in a first reactor among the polymerization reactors is 50% or less.

Method for preparing modified conjugated diene-based polymer

The present invention relates to a method for producing unsaturated aldehydes and unsaturated carboxylic acids. According to the present invention, a method for producing unsaturated aldehydes and unsaturated carboxylic acids which can impart activity and control temperature independently in fixed catalyst layer zones in a shell-and-tube reactor, thereby exhibiting improved yield and operation stability, is provided.

Method for producing unsaturated aldehyde and unsaturated carboxylic acid

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

The present invention relates to a long-chain branched elastic terpolymer capable of satisfying excellent processability and elasticity (flexibility) at the same time, which is obtained in the presence of a Group IV transition metal catalyst, and a preparation method thereof. The elastic terpolymer is a copolymer of ethylene, an alpha-olefin having 3 to 20 carbon atoms, and a diene, wherein

Elastic diene terpolymer and preparation method thereof

The present invention relates to a long-chain branched elastic terpolymer capable of satisfying excellent processability and elasticity (flexibility) at the same time, which is obtained in the presence of a Group IV transition metal catalyst, and a preparation method thereof. The elastic terpolymer is a copolymer of ethylene, an alpha-olefin having 3 to 20 carbon atoms, and a diene, wherein (i) its weight average molecular weight measured by GPC is 100,000 to 500,000, and (ii) x which is an ethylene content (% by weight) and y which is a crystallization temperature (K) of the copolymer measured when the ethylene content is X satisfy a relationship of 2.628x+100&#x2266;y&#x2266;2.628x+112.

Disclosed is an apparatus for recovering an acrylic acid from a mixture containing acrylic acid, acrylic acid dimer and impurities with high boiling point, including: an acrylic acid recovering device that comprises an acrylic acid distillation unit being present within an acrylic acid dimer pyrolysis tank, and is operated under reduced pressure; a separation column for removing impurities with high boiling point from the mixture which is introduced into the acrylic acid recovering device; and a line for introducing the mixture into the acrylic acid recovering device.

Apparatus for recovering acrylic acid

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Daejeon, South Korea

Jun Seok Ko