A Study on Synthesis Process of Zeolite 4A for Improvement of Properties as a Detergent Builder

Zeolite 4A was prepared by new synthesis method, 2-step crystallization, for enhancement of oil absorption capacity. Vietnamese sand and solution from natural bauxite were used as raw materials in stead of conventional cullet and Al to reduced the processing cost. Some dissolved organics in solution were removed by activated carbon. Synthetic method was progressed by 1) reacting the raw materials at , 4 hr with the ratio of Si/Al to 1.15, and 2) reacting at , 5 hr with reducing the ratio of Si/Al to 0.98. New method can easily control the particle size, aggregation, surface polarity, and enhanced the whiteness of the products. The prepared zeolite 4A shows excellent oil absorption capacity(O.A.C>50 ml/100 g) as well as equal value with calcium ion exchange capacity, and proves the 2-step crystallization is the economic and effective process for the preparation of zeolite 4A.