Abstract: The present disclosure relates to a method of polymerizing a polymer having an ester functional group, a catalyst for use in the method, and a composition for use in the method. More specifically, proposed is a method of depolymerizing a polymer having an ester functional group by using potassium carbonate (K2CO3) as a depolymerization catalyst and an alcohol and a polar aprotic solvent as solvents. In addition, a composition for depolymerizing a polymer having an ester functional group is proposed.

Abstract: The present invention relates to an extractant and an extraction method for removing color-expressing foreign substances from a colored polymer containing an ester functional group and a method for chemically selecting a polymer containing an ester functional group from a colored polymer mixture and, more specifically, to an extractant capable of effectively removing foreign substances, such as a dye and a pigment, from a colored polymer exhibiting a color by the foreign substances and containing an ester functional group, to a method for eluting most of color-expressing foreign substances by contact with a colored polymer containing an ester functional group while the extractant is maintained at a specific temperature range, and to a method of adding the extractant to a colored polymer mixture to selectively elute foreign substances from only a colored polymer containing an ester functional group and then effectively selecting, through color differentiation, a polymer having the foreign substances removed th

Abstract: The present disclosure relates to a method for producing a terephthalate derivative from dimethyl terephthalate. The present disclosure provides an efficient and economic method for producing a terephthalate derivative from dimethyl terephthalate in high yield by optimizing reaction conditions, selecting optimum transesterification reaction catalysts, and simplifying processes.

Abstract: The present disclosure relates to a depolymerization method of a polymer comprising an ester functional group with or without pigments or dyes, a composition for the depolymerization, and a purification method for selectively separating foreign substances from a monomer of the polymer, and is characterized in that a compound represented by formula 1 is added as an additive. The depolymerization method according to the present disclosure enables depolymerization at low temperatures and may increase the yield of a target product. In addition, the purification method according to the present disclosure may remove foreign substances including pigments or dyes from a monomer of the polymer to prepare high-purity monomers.

Abstract: Proposed is a catalyst complex having high activity for carbon dioxide conversion reaction that converts carbon dioxide to useful compounds through reaction of carbon dioxide and hydrocarbon containing at least one hydroxyl group, and a carbon dioxide conversion process using the same, wherein the catalyst complex includes, as an active metal in the catalyst complex, at least one of noble metals and at least one of transition metals other than noble metals, thereby having high activity for the carbon dioxide conversion reaction.

Abstract: Proposed is a catalyst complex having high activity for carbon dioxide conversion reaction that converts carbon dioxide to useful compounds through reaction of carbon dioxide and hydrocarbon containing at least one hydroxyl group, and a carbon dioxide conversion process using the same, wherein the catalyst complex includes, as an active metal in the catalyst complex, at least one of noble metals and at least one of transition metals other than noble metals, thereby having high activity for the carbon dioxide conversion reaction.

Abstract: Provided are an ethanol dehydration catalyst having a high ethylene yield even at a low temperature region, as an ethanol dehydration catalyst for converting a feedstock including anhydrous ethanol or hydrous ethanol to ethylene, and a method of preparing ethylene by using the same. In the ethanol dehydration catalyst for converting a feedstock including anhydrous ethanol or hydrous ethanol to ethylene of the present invention, the catalyst includes 0.1 wt % to 0.5 wt % of lanthanum (La) or 0.05 wt % to 1 wt % of gallium (Ga) in ZSM-5.

Abstract: Provided are an ethanol dehydration catalyst having a high ethylene yield even at a low temperature region, as an ethanol dehydration catalyst for converting a feedstock including anhydrous ethanol or hydrous ethanol to ethylene, and a method of preparing ethylene by using the same. In the ethanol dehydration catalyst for converting a feedstock including anhydrous ethanol or hydrous ethanol to ethylene of the present invention, the catalyst includes 0.1 wt % to 0.5 wt % of lanthanum (La) or 0.05 wt % to 1 wt % of gallium (Ga) in ZSM-5.