the hydroxyl value of epoxy-containing polyester was determined by analyzing acetification principle and using acetyl chloride as acetifier and methylene chloride as solvent.
通过对其酰化原理分析,选用乙酰氯作酰化剂、 二氯甲烷作酰化溶剂,测定含环氧基聚酯的羟值。
approximately 473 l of methylene chloride was added to the reaction vessel to dilute the suspension.
在反应容器中加入约473升二氯甲烷以稀释悬浊液。
do not contact methylene chloride acet (like nail oil) strong acid detergent.
不要接触亚甲基氯化物、丙酮(去指甲油剂)、强酸清洗剂。
use of natural gas for heat chlorination methylene chloride for the production of photographic materials for industrial solvent.
采用天然气热氯化法生产二氯甲烷以供感光材料工业作溶剂。
objective: we detected the content of methylene chloride and diethylene oxide in ceftizoxime sodium using head-space gc method.
目的:建立一种气相色谱法测定原料药头孢唑肟钠中二氯甲烷和四氢呋喃有机溶剂残留量的方法。