Synthesis of dimethyl ether from methane mediated by HBr

Dimethyl ether （DME） was synthesized from methane through a two-step process, in which CH3Br was prepared from the oxidative bromination reaction of methane in the presence of HBr and oxygen over a Rh-SiO2 catalyst and then, in the second step, CH3Br was hydrolyzed to DME over a silica supported metal chloride catalyst. 12 mol%ZnCl2/SiO2 catalyst was found to be the most active, but it deactivated because of Cl- losing.

苯酰化聚苯醚/聚苯乙烯共混物相容性研究

采用DSC方法研究了聚苯乙烯(PS)和苯甲酰化聚苯醚(APPO)共混体系的相容性.相容共混体系Gordon-Taylor方程K参数随苯甲酰化程度(取代度)增加而变小,其玻璃化转变区随取代度增加而变宽,取代度大于76mol％时,共混物呈现双玻璃化转变.APPO/PS共混体系热诱导相图同时存在LCST和UCST现象,且相行为是可逆的.

强碱HZ201树脂吸附分离N-氨甲酰-D-茶氨酸的研究

从7种离子交换树脂中筛选出强碱HZ201树脂,考察了该树脂在不同pH条件下对N-氨甲酰-D-茶氨酸的吸附及N-氨甲酰-D-茶氨酸在该树脂上的静态吸附等温线、吸附动力学及动态吸附与洗脱情况。结果表明:在25℃,pH3,反应20 min,N-氨甲酰-D-茶氨酸吸附率可达90%。为N-氨甲酰-D-茶氨酸的纯化分离提供了一条新思路。