Abstract:
The aims of this research is to get a base oil (n-paraffins) of crude oil from oil field
Langgak, Riau which includes heavy crude oil types. Langgak crude oil contains fraction of saturat, aromat and residue. Base oil is the raw material oil derived from crude oil. Not all of the crude oil can be processed into base oil. Only the crude oil of the type n-paraffins produces base oil. But this crude oil is very limited in earth crust. In
this research, fractionation of Langgak crude oil was conducted using stationary phase active silica and n-hexane as a solvent to separate the fractions of saturate. Then, fraction of saturate crude oil were analyzed by gas chromatography (GC). The fraction of saturate crude oil was fractionated using zeolite A which aim to get crude oil n- paraffins type. The results of fractionation using zeolite A were analyzed by gas chromatography (GC). From the results of the chromatogram fractionation using activated silica the active silica can be seen capable of filtering the carbon atom to C-29
of fractions saturat crude oil. Whereas, the results of the chromatogram molecular sieve
using zeolite A was indicated the existence of the fraction saturat retained on the zeolite A, until zeolite A number carbon atoms were reduced 26. Zeolite A separates crude oil from the type of n-paraffin which another fractions of Langgak crude oil, which has an average efficiency of 72.39%. Moreover Langgak crude oil in the ratio pr / ph of 2.28 indicates that it is from the source rock samples from lakes and freshwater transitions (lacustrin)
