METHOD FOR PREPARING ETHYLENE-VINYL ALCOHOL COPOLYMER

• Main Authors: SONG, Sungjin, BAEK, Se Won, KIM, Bongjune, BAE, Hyojin
• Format: Patent
• Language: English; French; Korean
• Published: 29.06.2023
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

The present invention relates to a method for preparing an ethylene-vinyl alcohol copolymer, which performs a supercritical extraction process after an ethylene-vinyl acetate copolymer is saponified in the presence of an alkali catalyst, thereby minimizing waste liquid generation without complex apparatuses and equipment, such as a multi-stage distillation column or a pipe mixer and a water tank, and effectively removing by-products such as catalyst residues, and thus can efficiently obtain an ethylene-vinyl alcohol copolymer. La présente invention concerne un procédé de préparation d'un copolymère d'éthylène-alcool vinylique, qui met en oeuvre un processus d'extraction supercritique après saponification d'un copolymère d'éthylène-acétate de vinyle en présence d'un catalyseur alcalin, ce qui permet de réduire au minimum la génération de déchets liquides sans appareils et équipements complexes, tels qu'une colonne de distillation à étages multiples ou un mélangeur de tuyau et un réservoir d'eau, et d'éliminer efficacement des sous-produits tels que des résidus de catalyseur, et peut ainsi obtenir efficacement un copolymère d'éthylène-alcool vinylique. 본 발명은 알칼리 촉매의 존재 하에서 에틸렌-초산비닐 공중합체를 비누화 반응시킨 후에 초임계 추출 공정을 수행하여, 다단 증류탑이나 파이프믹서와 수조 등의 복잡한 장치 설비 없이도 폐액 발생을 최소화하며 촉매 잔여물 등의 부산물을 효과적으로 제거함으로써, 에틸렌-비닐알코올 공중합체를 효율적으로 수득할 수 있는 에틸렌-비닐알코올 공중합체의 제조 방법에 관한 것이다.