二是催化水合反应时催化剂带来的杂质；
The second comes from the catalyst when catalytic hydrate reaction happens;
缩合物的酸催化水合后的水解反应在保护剂存在下进行，羟基香茅醛的产率达87.7%。
After acid catalytic dehydration the condensate subsequent hydrolysis was proceeded in the existence of protective agent, the yield of hydroxycitronellal came up to 87.7%.
采用活性膨润土为催化剂、催化水合异龙脑脱氢后处理反应，除去茴香醇类物质和其他副产物。
The post-treatment of dehydrogenating hydrated exo-2-camphanol catalyzed by active bentonite is studied, and the anisalcohol analogues and other by-products are removed from reactants.
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