Lg Chem, Ltd

Jong Hun Song

Yoon Jae Min

Se Won Baek

Jeong Seok Lee

Moon Sub Hwang

Hong Min Lee

Kyung Seog Youk

Sul Hee Yoo

Min Ho Sun

Jae Yul Kim

You Na Kim

Gicheul Kim

Hyun Seok Kim

Heechang Woo

Ki Hyun Kim

Dong Kwon Lee

Seul Ah Lee

In Yong Jeong

Jaeyul Kim

A reactor cleaning method includes pressurizing a washing solvent container to 5 kg/cm·g to 40 kg/cm·g using pressurized gas; supplying a washing solvent stream from the washing solvent container to one or more of a lower portion or a side portion of the reactor to fill an inside of the reactor; and circulating the washing solvent stream between the washing solvent container and the reactor while maintaining a temperature of the reactor at 115° C. to 200° C.

Reactor cleaning method

Provided are a sparger including: a disc-shaped body; and a first hole and a second hole having different sizes from each other provided in the body, wherein a diameter of the second hole is smaller than a diameter of the first hole, and a reactor comprising the sparger.

Sparger and reactor comprising the same

The present disclosure provides a reactor cleaning apparatus including: a fixing part having a partial region inserted into a hole formed in an upper portion of a reactor to be coupled to the reactor and fixing a pipe; the pipe inserted into a hole formed in the fixing part, protruding downward from the fixing part, and having a length adjustable in a vertical direction; a spray nozzle provided at a lower end of the pipe; and a screener provided on a lower side surface of the pipe, and a reactor cleaning method using the same.

Reactor cleaning apparatus and reactor cleaning method

The method for preparing a super absorbent polymer according to the present disclosure has a feature that it is possible to reduce the generation of a fine powder during production of the super absorbent polymer while maintaining excellent physical properties of the super absorbent polymer, including centrifuge retention capacity (CRC) and vortex removal time.

Method for preparing super absorbent polymer

Provided is a method for preparing an oligomer including: supplying a monomer stream and a solvent stream to a reactor to perform an oligomerization reaction to prepare a reaction product; supplying a discharge stream from the reactor including the reaction product to a separation device and supplying a lower discharge stream from the separation device to a settling tank; adding an organic flocculant to the settling tank to settle and remove a polymer and supplying the lower discharge stream from the separation device from which the polymer is removed to a high boiling point separation column; and removing a high boiling point material from the lower portion in the high boiling point separation column and supplying an upper discharge stream including an oligomer to a solvent separation column.

Method for preparing oligomer

The present disclosure relates to an apparatus for preparing an oligomer, the apparatus including: a reactor for oligomerizing a feed stream containing a fed monomer; a stirrer inserted into a hole formed in an upper portion of the reactor; and a solvent transfer line extending inward from a side of the reactor, wherein the stirrer includes a rotating shaft vertically extending downward from the upper portion of the reactor, and a blade having a conical shape whose vertex is positioned at a lower end of the rotating shaft and outer diameter increases from a bottom toward a top, and the solvent transfer line has a plurality of spray nozzles formed in a direction toward the blade.

Apparatus for preparing oligomer

Provided is a method of producing an oligomer, the method including: supplying a monomer stream and a solvent stream to a reactor to perform an oligomerization reaction to produce a reaction product; supplying a discharge stream of the reactor to a separation device, and supplying an upper discharge stream of the separation device including an unreacted monomer to the reactor and supplying a lower discharge stream of the separation device to a settling tank; settling a polymer in the settling tank and removing the polymer, and supplying the lower discharge stream of the separation device from which the polymer is removed to a high-boiling point separation column; removing a high-boiling point material from a lower discharge stream of the high-boiling point separation column and supplying an upper discharge stream of the high-boiling point separation column including an oligomer to a solvent separation column; and separating a solvent and the oligomer in the solvent separation column.

Method of producing oligomer

The present disclosure relates to an apparatus for preparing an oligomer, and more particularly, to an apparatus for preparing an oligomer including: a reactor including a gaseous area having a first gaseous reactant inlet provided at a lower portion thereof, and a reaction area in which a reaction medium reacts with the gaseous reactant above the gaseous area; a second gaseous reactant inlet provided on an inner wall of the reactor in the gaseous area and a third gaseous reactant inlet provided on an inner wall of the reactor facing the second gaseous reactant inlet; and a first injection nozzle connected to the second gaseous reactant inlet and a second injection nozzle connected to the third gaseous reactant inlet.

The present disclosure relates to an apparatus for preparing an oligomer, including: a reactor receiving a monomer stream and performing an oligomerization reaction to prepare a reaction product; a product discharge line for transferring a reaction product stream discharged from the reactor; and a bubble catcher provided in any area of the product discharge line to remove bubbles contained in the reaction product stream.

An apparatus for preparing an oligomer including: a reactor supplied with a monomer stream and a solvent stream to perform an oligomerization reaction; a product discharge line provided on a lower portion of a side surface of the reactor; a washing liquid supply line connected to a first point of the product discharge line; and a washing liquid discharge line extending from a second point of the product discharge line, wherein the product discharge line includes a branch point at which the product discharge line is branched into two or more lines and a junction point at which the respective branched lines are joined, and the product discharge line includes pressure control devices provided in each of the two or more branched lines.

The method for preparing a super absorbent polymer according to the present disclosure reduces the generating amount of a fine powder while realizing the same particle size distribution in the process of pulverizing the dried polymer, thereby reducing the load of the fine powder reassembly, drying, pulverizing and classifying steps.

The present disclosure provides an apparatus for preparing oligomer including: a reactor; a gas-liquid separator; a solvent transfer line; a second transfer line; a first spray nozzle unit; and a second spray nozzle unit. The apparatus is capable of improving stability of the entire process by including a first spray nozzle unit and a second spray nozzle unit in a reactor and thus preventing by-products containing polymer substances such as C20+ from being entrained with a desired product during a reaction.

Provided is an apparatus for preparing oligomer including: a reactor for carrying out oligomerization reaction by supplying a monomer stream and a solvent stream; and lineand linewhich are separately provided in a lower side of the reactor, wherein lineincludes a first level control valve and lineincludes a second level control valve, and the reactor is periodically alternately operated in first operation mode and second operation mode, thereby switching a pipe through which the product is discharged, so that a plugging phenomenon of the pipe through which the product is discharged and the valve can be prevented.

The present invention relates to a continuous recovery method of (meth)acrylic acid and an apparatus for use in the recovery method. A continuous recovery method of (meth)acrylic acid according to the present invention can ensure a high recovery rate of (meth)acrylic acid through an acetic acid separation process in addition to enabling the stable recovery of (meth)acrylic acid and the operation of continuous processes.

Method and apparatus for continuously recovering (meth)acrylic acid

The present invention relates to a continuous recovery method of (meth)acrylic acid and an apparatus for use in the recovery method. A continuous recovery method of (meth)acrylic acid according to the present invention can ensure a high recovery rate of (meth)acrylic acid through a solvent recovering process in addition to enabling the stable recovery of (meth)acrylic acid and the operation of continuous processes.

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Daejeon, South Korea

Jong Hun Song