Preparation method of low-ash polyvinyl alcohol

The invention discloses a preparation method of low-ash polyvinyl alcohol, comprising the steps of alcoholysis by base catalysis and drying each unit, characterized by carrying out solid-liquid extraction on the dried polyvinyl alcohol, wherein the extractant used in solid-liquid extraction is an al...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Hauptverfasser:	LI QIDONG, WU FUSHENG, XU XIANZHI, WANG PINGLIN, WU CONGREN, XIANG XUEYI, XU XUEBIN
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	CHEMISTRY COMPOSITIONS BASED THEREON MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	The invention discloses a preparation method of low-ash polyvinyl alcohol, comprising the steps of alcoholysis by base catalysis and drying each unit, characterized by carrying out solid-liquid extraction on the dried polyvinyl alcohol, wherein the extractant used in solid-liquid extraction is an alcohol-water solution, the molar ratio of alcohol to water in the alcohol-water solution is 3.5:1-12:1, and the weight ratio of polyvinyl alcohol to the extractant is 0.065-0.15:1. The polyvinyl alcohol (PVA) prepared by the method of the invention has an ash content of no higher than 0.08%, and unchanged alcoholysis degree. The invention is suitable for polyvinyl alcohol with different degrees of polymerization, and can satisfy the requirements of different varieties.