Benzene, cyclohexane and normal pentane etc. are frequently used as entrainers in industrial production of anhydrous alcohol through constant boiling and fine distillation.
工业生产中常用苯、环己烷、正戊烷等作夹带剂进行恒沸精馏生产无水乙醇。
The components of light benzene and purified benzene are separated using the same packed column in the condition of program raising temperature and quantified using direct area normal method.
用同一填充柱在程序升温条件下，分离轻苯及精制苯中各组份，并用直接面积归一法进行定量，苯系相对误差为0.94%。
The plant has been under normal operation since the new technology was executed and the output of crude benzene increased. The effect of energy-saving and emission reducing has been remarkable.
新工艺投入生产以来，运行正常，粗苯产量得到提高，节能减排效果明显。
2-(methylenedioxy)benzene is synthesized by using catechol, dichloromethane and dimethylsulfoxide with the condition of alkali and normal pressure. Overall yield of the process is 73.4%.
前言：以邻苯二酚和二氯甲烷为原料，二甲亚砜为溶剂，在碱性条件下合成1，2-亚甲二氧基苯，产品收率达到73.4%；
2-(methylenedioxy)benzene is synthesized by using catechol, dichloromethane and dimethylsulfoxide with the condition of alkali and normal pressure. Overall yield of the process is 73.4%.
前言：以邻苯二酚和二氯甲烷为原料，二甲亚砜为溶剂，在碱性条件下合成1，2-亚甲二氧基苯，产品收率达到73.4%；
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