Lg Chem, Ltd

Hanon Systems

Won Seok Kim

Seung Young Park

Sung Kyoung Kim

Kyung Min Min

Sang Cheol Shin

Won Hee Woo

Tae Wan Kim

Sang Hun Kim

Jeong Heon Ahn

Ho Bin Im

Hyun Chul Jung

Il Hwan Cho

Min Sik Kim

Young Shil Do

Wan Kyu Oh

Sae Hume Park

Ji Ha Kim

Yu Jin An

Chul Kyu Lee

Sung Joon Lee

Pureunsam Park

Kyung Won An

Song Cheol Lee

Eui Hyun Kim

Eun Bang Lee

Sin Cheol Kang

The present invention relates to a motor driving control system and a control method thereof. The purpose of the present invention is to provide a motor driving control system and a control method thereof, which may change electric current limiting logic, which is applied to a BLDC motor for a cooling fan, in response to an operating speed of the motor to stably protect the motor from an overload in a low-speed driving state as well as an overload in a high-speed driving state.

Motor driving control system and control method thereof

Provided is a method of preparing an acrylonitrile dimer, the method including: supplying an acrylonitrile monomer, a phosphorus-based catalyst, an alcohol solvent, and an ionic liquid to a reactor to perform a dimerization reaction to prepare a single-phase dimerization reaction product (S10); supplying a reactor discharge stream including the dimerization reaction product to a first distillation column, separating the alcohol solvent and an unreacted acrylonitrile monomer from an upper discharge stream, and supplying a lower discharge stream including an acrylonitrile dimer, the ionic liquid, and the phosphorus-based catalyst to a second distillation column (S20); and separating an upper discharge stream including the acrylonitrile dimer and separating a lower discharge stream including the ionic liquid and the phosphorus-based catalyst, from the second distillation column (S30).

Method for preparing acrylonitrile dimer

The present disclosure provides a polyalkylene carbonate-based resin having excellent thermal stability, thereby having an improved heat shrinkage phenomenon, and a molded article produced using the same. The polyalkylene carbonate-based resin includes 100 parts by weight of a base resin including a polyalkylene carbonate resin and a polylactide resin, and 5 parts by weight to 10 parts by weight of a heat shrinkage prevention agent, wherein the base resin includes the polyalkylene carbonate resin and the polylactide resin in a weight ratio of 6:4 to 4:6, and the heat shrinkage prevention agent is one or more selected from the group consisting of a polyalkyl(meth)acrylate-based resin, a polyalphaolefin-vinyl acetate-based resin, and a polyoxyalkylene-based resin.

Polyalkylene carbonate-based resin, and molded article produced therefrom

The present disclosure relates to a method for separating an organozinc catalyst from a polyalkylene carbonate polymerization solution, and the method of the present disclosure includes: stirring and aging a polymerization solution including a polyalkylene carbonate resin, an organozinc catalyst, an alkylene oxide and a polymerization solvent; and filtering the polymerization solution after completing the aging.

Method for separating organozinc catalyst from polyalkylene carbonate polymerization solution

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Daejeon, South Korea

Won Seok Kim