Etherification of butanol with ethylene oxide by a new style solide acid catalyst is investigated.研究了丁醇和环氧乙烷在一种新型固体酸催化剂上的醚化反应.The purified rice amylose and amylopectins were obtained by n - butanol recrystallization meth...
碳精棒常用于电弧灯.The stick of carbon is often used in an electric arc lamp.内阳极有两种材质,分别为不溶性碳精棒和含磷铜棒.The inner anode includes insoluble carbon and phosphorous - copper bar....