Lg Chem, Ltd

Sul Hee Yoo

Se Won Baek

Jong Hun Song

Yoon Jae Min

A method of preparing (meth)acrylic acid by using a reaction distillation apparatus including a reaction distillation tower, and a natural circulation type of heat exchanger as a heat source for the reaction distillation tower. The reaction distillation tower a vessel, where decomposition of Michael adducts occurs, connected to a distillation tower, where distillation of decomposition products occurs. The method includes the following steps: feeding a waste liquid to the reaction distillation apparatus after passing through the heat exchanger, wherein the waste liquid is fed to a lower portion of the heat exchanger via a first input port; feeding a gas, separately from the waste liquid via a second input port, to the lower portion of the heat exchanger, and producing and recovering (meth)acrylic acid while the waste liquid is circulated in the reaction distillation apparatus by the gas which is fed separately from the waste liquid.

Method of preparing (meth)acrylic acid

A method of continuously recovering (meth)acrylic acid is provided. The method of continuously recovering (meth)acrylic acid according to the present disclosure enables use of a natural circulation type of reboiler which does not require an operating part in a destructive distillation process of recovering (meth)acrylic acid from a (meth)acrylic acid waste liquid, and therefore, stable operation of the continuous process may be achieved while simplifying equipment configuration.

Method of continuously recovering (meth)acrylic acid

This disclosure relates to a method for continuous recovery of (meth)acrylic acid and an apparatus used for the recovery method. The method of continuous recovery of (meth)acrylic acid according to the present invention may minimize loss of (meth)acrylic acid particularly in the distillation process, and yet enables stable operation of the distillation process and energy reduction.

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

This disclosure relates to a method for continuous recovery of (meth)acrylic acid and an apparatus used for the recovery method. The method of continuous recovery of (meth)acrylic acid according to the present invention may remarkably reduce the amount of extraction solvent used and energy consumption of the total process, and minimize polymerization of (meth)acrylic acid in the recovery process, thus enabling stable recovery of (meth)acrylic acid and operation of a continuous process.

Provided are a method and an apparatus for recovering (meth)acrylic acid. The recovering method is used to save the energy required for a process of recovering (meth)acrylic acid because a process of separating high-boiling point by-products can be omitted, and to minimize a possibility of (meth)acrylic acid polymerization during the process of recovering (meth)acrylic acid. Therefore, the recovering method is used to obtain (meth)acrylic acid with less energy in a high yield.

Recovery method and recovery device for (meth) acrylic acid

This disclosure relates to a method of continuous recovery of (meth)acrylic acid and an apparatus used for the recovery method. The method of continuous recovery of (meth)acrylic acid according to the present invention may effectively remove scum, thus enabling stable operation of the continuous process.

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

This disclosure relates to a method of continuous recovery of (meth)acrylic acid and an apparatus used for the recovery method. The method of continuous recovery of (meth)acrylic acid according to the present invention may effectively remove scum formed in the continuous recovery process of (meth)acrylic acid, and simultaneously recover (meth)acrylic acid with excellent efficiency, thus enabling more stable operation of the continuous process.

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Daejeon, South Korea

Sul Hee Yoo