EFFECT OF ZEOLITE 4A ON WATER CONCENTRATION IN THE SYSTEM OF THE ESTERIFICATION REACTION OF ACETIC ACID WITH 1-BUTANOL - Kusumaningtyas, Ratna Dewi; Department of Chemistry, Faculty of Mathematics and Natural Sciences, State University of Semarang (UNNES), Kampus Sekaran, Semarang (Universitas Gadjah Mada, 2010)