Lg Chem, Ltd

Kyung Seog Youk

Hyun Min Lee

Heung Kwon Bae

Jung Rae Lee

Jeong Seok Lee

Jong Hun Song

Moon Sub Hwang

Hong Min Lee

Min Ho Sun

Kyung Hyun Kim

Joong Chul Lim

Seung Young Park

Kwang Jin Lee

Jung Min Sohn

Chan Hee Lee

Han Hong Kim

Se Woong Lee

Seung Ho Choi

Hyun Seok Kim

Hyun Jin Shin

Min Jeong Kang

Hyun Sup Lee

Dong Kwon Lee

Yong Jin Kim

The present invention provides a method for preparing a vinyl chloride-based polymer, the method including (1) polymerizing a vinyl chloride-based monomer in the presence of a vinyl chloride-based first seed particle, a vinyl chloride-based second seed particle, and an emulsifier and (2) separating, after the polymerizing, a first vinyl chloride-based polymer and a second vinyl chloride-based polymer which are in a particulate form, wherein the separated first vinyl chloride-based polymer is dried using a fluid bed dryer (FBD), and the first vinyl chloride-based polymer has a smaller average particle diameter (D) than the second vinyl chloride-based polymer, and two kinds of polymers having different physical properties may be prepared through a single manufacturing process.

Composition for polymerizing vinyl chloride-based polymer and method for preparing vinyl chloride-based polymer using same

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

The present invention provides a post-treatment method of a vinyl chloride-based polymer including: (a) preparing a stream containing vinyl chloride-based polymer powder and unreacted vinyl chloride-based monomers by drying a vinyl chloride-based polymer latex in a drying unit; (b) filtering the stream containing the vinyl chloride-based polymer powder and the unreacted vinyl chloride-based monomers in a filtering unit; and (c) recirculating a gas containing the unreacted vinyl chloride-based monomers discharged from the filtering unit to a latex storage unit.

Post-treatment method of vinyl chloride-based polymer and closed post-treatment system for the same

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

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 provides a method for preparing a polymerization initiator composition, including (a) a step of mixing water and a water-soluble initiator to prepare an aqueous initiator solution having a concentration of 1 to 10%; and (b) a step of activating the aqueous initiator solution, wherein the step of activating is performed by (b-1) a step of heat treating the aqueous initiator solution for 0.5 to 4.5 hours at a temperature of 48 to 62° C.; and (b-2) a step of treating the aqueous initiator solution to achieve pH of 1 to 7, where the steps above are performed in no particular order.

Method for preparing polymerization initiator composition

The present disclosure provides a composition for preparing a vinyl chloride-based polymer, including a vinyl chloride-based first seed; a vinyl chloride-based second seed; an initiator composition including a water-soluble initiator and an oil-soluble initiator; a reducing agent; and a vinyl chloride-based monomer, wherein a metal catalyst is not included in the composition, and a method for preparing a vinyl chloride-based polymer using the same.

Composition for preparing vinyl chloride-based polymer and method for preparing vinyl chloride-based polymer using the same

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 present invention relates to a vinyl chloride-based polymer showing high viscosity properties in a low shear region and showing viscosity and stress decreasing properties in line with the increase of a shear rate, a method for preparing the same, and a plastisol comprising the same. Since the vinyl chloride-based polymer comprises a saponified emulsifier in a specific ratio, high viscosity properties may be shown in a low shear region, and Bingham fluid flow properties may be shown, by which viscosity and stress decrease in line with the increase of a shear rate.

Method for preparing polyvinyl chloride

The present invention relates to a vinyl chloride-based polymer composition and a method for producing the same, and more particularly, to a vinyl chloride-based polymer composition including a vinyl chloride-based polymer and a plasticizer, wherein the vinyl chloride-based polymer includes a higher fatty acid having 10 to 18 carbon atoms in an amount of more than 0.05 parts by weight to less than 2.0 parts by weight, based on 100 parts by weight of the vinyl chloride-based polymer.

Vinyl chloride-based polymer composition and method for producing the same

The present invention relates to a vinyl chloride-based polymer, a method of preparing the same, and a plastisol including the vinyl chloride-based polymer. The vinyl chloride-based polymer according to the present invention may exhibit high viscosity characteristics in a low shear region by having particle size distribution characteristics, in which particles having a relatively small particle diameter and particles having a relatively large particle diameter are distributed at a specific ratio, and may exhibit low viscosity characteristics in a high shear region due to small increases in viscosity and stress as shear rate increases, and thus, the vinyl chloride-based polymer may be easily used in a spray coating process. Therefore, the vinyl chloride-based polymer according to the present invention and the method of preparing the same may be easily applied to industries that need them, for example, vinyl chloride-based resin industry for paste processing.

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Daejeon, South Korea

Kyung Seog Youk