STUDY ON RECOVERY OF OIL FROM GAC CAKE

Abstract

Gac cake is the residue part of gac membrain after oil extraction. The nutrition
of gac cake is equivalent to that of yellow-grain corn, but the fat is 2-3 times
higher than that of corn. 1kg of dried gac cake has 105g of protein, 122g of fat and
a little fiber (54g). In gac cake, there are quite a lot of gấc oil content β - carotene,
lycopene and  - tocopherol (Vitamine E). Currently, gac cake is used as animal
feed, the commercial value is not high. This paper point to study, an effective
recovery method of gac oil from gac cakeqthat based on the comparison of the
recovery efficiency of some traditional solvents such as hexane, petroleum ether
and sub-critical dimethyl ether (DME). Extraction by the sub-supercritical
dimethyl ether method in the low-pressure region gives good results. The results
showed that, with in a short time, 15 minutes, extraction by DME gave the highest
yield of 87.4% compared to the other. The study investigated the influence of
some technological parameters (temperature, solvent ratio) on the efficiency of
Gac oil recovery from gac cake by using DME as well. The results showed that the
highest extraction yield reached to 96.77% with in an hour.