PROCESS FOR THE DEWAXING OF HYDROCARBON FRACTIONS

摘要

A process for improving the fluidity of hydrocarbon fractions by dewaxing thereof. In the present process, hydrocarbon fractions are contacted with hydrogen in the presence of a specific type of catalyst, thereby lowering the pour point of the hydrocarbon fraction. The catalyst comprises a specific type of zeolite which is defined by a specific X-ray diffraction pattern and which has a predetermined range of mesitylene adsorption of not less than 1.6 wt %. The zeolite catalyst is obtained by providing an aqueous reaction mixture of SiO2, Al2O3, an alkaline source as OH-, and a carboxyl group-containing organic compound having the following composition: -SiO2/Al2O3 20-60 -H2O/SiO2 5-100 -OH-/SiO2 0.1-0.35 - and reacting the mixture until crystals are produced. Advantageously, the ratio of the carboxyl group-containing organic compound to aluminum oxide is about 1.0 to 100.