Lg Chem, Ltd

Jong Suh Park

Sung Kyu Lee

Joon Ho Shin

Sang Ho Lee

Tae Woo Kim

Jong Ku Lee

Seong Hoon Kang

In Kyu Park

Se Ho Park

Yeon Uk Choo

Jong Hyun Chae

Hyun Taek Oh

Yeong Dae Kim

Won Ho Lee

Dong Il Lee

Yong Jin Choe

Do Dam Kim

Jue Hyung Kang

Jun Sik Kim

The present application relates to a distillation device. When a feedstock containing acetone and methanol is separated using a distillation device according to the present application, a methanol removal distillation column may be located at a position for easily separating methanol to solve a problem due to accumulation of methanol in the process and to lower the methanol content in the acetone product, and thus the lifetime of catalysts can be extended, and moreover, methanol can be removed with good efficiency from a flow of the lower part of the distillation column obtaining the final acetone product by using only the conventional phase separator and one methanol removal distillation column further installed, so that the acetone product obtained from the upper part of the distillation column obtaining the acetone product can be obtained in high purity and the operating cost and the equipment cost of equipments can be greatly reduced.

Distillation device

Provided are a method of and a device for purifying isopropyl alcohol. Water may be effectively removed from a feed including water and isopropyl alcohol while consuming a minimum amount of energy, and therefore, a high-purity isopropyl alcohol may be obtained.

Method for purifying isopropyl alcohol

Provided are an apparatus and a method for preparing bisphenol A. In the present invention, all or some of a mother liquid stream is circulated to a flash rector through a bypass line after crystallization in a process of preparing bisphenol A so as to increase a conversion rate of bisphenol A in a reactor, reduce energy, and use a heating source of phenol to be discharged to an upper side of the flash reactor, and thus the reaction efficiency of the whole process can be increased.

Bisphenol A preparation apparatus and preparation method

The present invention relates to a method for purifying terephthalaldehyde which comprises a first step of dissolving terephthalaldehyde containing impurities in an aromatic solvent at high temperature to prepare a solution; and a second step of quenching the solution to re-crystallize it into terephthalaldehyde. In accordance with the present invention, high pure terephthalaldehyde may be economically prepared.

Method for purifying terephthalaldehyde

The present invention relates to a method for preparing an aromatic dialdehyde, comprising, a) a step of gas phase oxidation reaction for preparing aromatic dialdehyde from dimethyl benzene; b) a step of separation for selectively recovering crude aromatic dialdehyde of molten phase from the reaction product of the step (a); and c) a step of purification for obtaining highly pure aromatic dialdehyde by purifying said crude aromatic dialdehyde, and a manufacturing system used for the preparation method. The method for preparation of the aromatic dialdehyde according to the present invention is simple, effective, and advantageous in that highly pure aromatic dialdehyde can be continuously prepared.

Method for preparing an aromatic dialdehyde and manufacturing system for the same

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Chungcheongnamdo, South Korea

Jong Suh Park