品纯度可达9．7％99．9％；③c炔烃无需加氢处理，流程简单，投资低，操作方便，经济效益高；④NMP具有优良的选择性和溶解能力，沸点高、蒸汽压低，因而运转中溶剂损失小；⑤热稳定性和化学稳定性极好，即使发生微量水解，其产物也无腐蚀性。因此装置可全部采用普通碳钢。确切地比较各种丁二烯生产方法的经济性是困难的，比较一致的看法是催化脱氢法的成本最高，氧化脱氢法次之，由乙烯装置副产的c馏分分离法最为便宜。乙烯装置副产C馏分只相当燃料的价格，因此分离得到丁二烯的成本比脱氢法低30％40％。从目前乙烯的生产规模及发展趋势来看，由乙烯装置副产的C馏分分离丁二烯仍将是丁二烯的主要来源，氧化脱氢法只是用来弥补乙烯副产的不足，而催化脱氢法基本被淘汰。
5
f化工与材料工程学院毕业设计外文翻译
第2章外文翻译
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