Abstract: To reduce the contents of catalysts remaining in terpene resin produced by the traditional method, a primary improvement for its preparation process was put forward, i.e., SbCl₃, a kind of Lewis acids with high toxicity as the co-catalyst in the reaction, was replaced by TMCS. The new process has been proved that it had a remarkable effect on decreasing the residual quantity of catalysts. The obtained products usually have excellent quality and the contents of chlorine and aluminum in it are lower than 100 mg/kg and 5 mg/kg respectively. There is no antimony existing in them. It is considered that terpene resins from new process could serve as food additives according to FDA standard.

Key words: terpene resin, production process, alkylchlorosilane