Lg Chem, Ltd

Topins Co., Ltd.

Hyun-Kyu Kim

Jun-Seok Ko

Se-Won Baek

Dong-Hyun Cho

Kyu-Il Lee

Kye-Seok Lee

Kyoung-Su Ha

Dong-Hyun Woo

Sung-Koo Park

The present invention relates to a method and apparatus for continuous recovery of (meth)acrylic acid, and more specifically to a method of continuous recovery of (meth)acrylic acid, including: conducting gas phase oxidation of at least one compound selected from the group consisting of propane, propylene, butane, i-butylene, t-butylene, and (meth)acrolein in the presence of a catalyst to obtain a mixed gas containing (meth)acrylic acid; quenching the (meth)acrylic acid-containing mixed gas to remove high boiling point by-products in the (meth)acrylic acid-containing mixed gas; contacting the high boiling point by-product-free (meth)acrylic acid-containing mixed gas with water or an aqueous solution to obtain an aqueous solution containing (meth)acrylic acid; and purifying the aqueous solution containing (meth)acrylic acid to obtain (meth)acrylic acid. The continuous recovery method of (meth)acrylic acid according to the present invention may significantly reduce energy consumption and continuously recover high purity (meth)acrylic acid with excellent production efficiency compared to the previous recovery methods.

Process for continuous recovering (meth) acrylic acid and apparatus for the process

The present invention provides a method of recovering a (meth)acrylic acid ester, which comprises the steps of: (a) carrying out an esterification reaction between an alcohol and (meth)acrylic acid in the presence of a catalyst to obtain a (meth)acrylic acid ester, wherein a byproduct is generated together with the (meth)acrylic acid ester; and (b) subjecting the byproduct generated in step (a) to a reaction with a catalyst and water in a reactor, wherein the water is fed into the reactor in order that water content exceeds 0 wt % but is 10 wt % or less in the reactor based on the total weight of reactants comprising the byproduct, the catalyst and the water, and thereby separating the (meth)acrylic acid, the alcohol and the (meth)acrylic acid ester contained in the byproduct from the byproduct to obtain the (meth)acrylic acid, the alcohol and the (meth)acrylic acid ester as a recovered product.

Method of recovering (meth) acrylic acid ester

The present invention relates to a method and apparatus for continuous recovery of (meth)acrylic acid, and more specifically to a method of continuous recovery of (meth)acrylic acid, including: conducting gas phase oxidation of at least one compound selected from the group consisting of propane, propylene, butane, i-butylene, t-butylene, and (meth)acrolein in the presence of a catalyst to obtain a mixed gas containing (meth)acrylic acid; quenching the (meth)acrylic acid-containing mixed gas to remove high boiling point by-products in the (meth)acrylic acid-containing mixed gas; contacting the high boiling point by-product-free (meth)acrylic acid-containing mixed gas with water or an aqueous solution to obtain an aqueous solution containing (meth)acrylic acid; and purifying the aqueous solution containing (meth)acrylic acid to obtain (meth)acrylic acid. The continuous recovery method of (meth)acrylic acid according to the presentA invention may significantly reduce energy consumption and continuously recover high purity (meth)acrylic acid with excellent production efficiency compared to the previous recovery methods.

The present invention relates to a method of preparing an alkyl (meth)acrylate, and more specifically to a method of preparing an alkyl (meth)acrylate which comprises the steps of: carrying out an esterification reaction with reactants comprising an alkanol and (meth)acrylic acid in the presence of an organic acid catalyst with a conversion rate of about 70% or more; supplying reaction products of the esterification reaction to a distillation tower equipped with a reboiler at the lower end to purify them; recovering a upper discharge comprising an alkyl (meth)acrylate and water at the upper part of the distillation tower and recovering a lower discharge comprising high boiling materials and water at the lower part of the distillation tower; separating the lower discharge of the distillation tower into a water layer and an organic layer; and recirculating the water layer separated from the lower discharge so as to be used in the esterification reaction, wherein each of the steps occurs continuously and the lower discharge of the distillation tower includes water in an amount of about 2-25% by weight with respect to the total weight of the lower discharge.

Method of preparing alkyl (meth)acrylate

The present invention relates to an apparatus for photographing an experimental object or animal. The apparatus comprises: a two-dimensional image photographing device which includes a light source, a first optical filter wheel, a first motor, a beam splitter, a second motor, a first window, a second window, an optical zoom module, a second optical filter wheel, a fourth motor, a photographing means and a first enclosure; a three-dimensional image photographing device which includes a laser scanner, a test tube, a third motor, a test tube mounting stand and a second enclosure; and a control section for controlling the operations of the first motor, the second motor, the optical zoom module, the photographing means, the third motor and the fourth motor. The experimental object photographing apparatus includes the three-dimensional experimental object photographing device detachably mounted to the two-dimensional image photographing device so as to obtain two-and three-dimensional images of the experimental object. Since the three-dimensional image photographing device is coupled to the two-dimensional image photographing device only when it is desired to photograph the three-dimensional image, its installation and operation are easy and the two-and three-dimensional image photographing devices do not need to be purchased separately, thereby saving the cost.

Testing matter photographing apparatus attached three dimensional image photographing device

The present invention relates to a trimethylolpropane ester-based plasticizer composition for polyvinyl chloride resin, more particularly a plasticizer composition comprising trimethylolpropane ester capable of using as plasticizer of polyvinyl chloride resin. The present invention can prepare polyvinyl chloride resin having superior tensile strength, elongation, migration, and sheet heating loss etc. by using the plasticizer composition.

Trimethylolpropane ester-based plasticizer composition for polyvinyl chloride resin

The present invention relates to a plasticizer composition, and more particularly a plasticizer composition comprising neopentylglycol ester capable of being using as plasticizer of polyvinyl chloride resin, and method of prepation thereof. The plasticizer composition of the present invention can prepare polyvinyl chloride resin having superior tensile strength, elongation, static heat resistance, and viscosity stability etc.

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Daejeon, South Korea

Hyun-Kyu Kim