复合孔微型高效浮阀塔盘在对二甲苯装置抽余液塔中的应用

对二甲苯装置吸附分离单元的抽余液塔是分离碳八芳烃（C8A）和对二乙苯（PDEB）的关键精馏塔，PDEB价格昂贵，在侧线C8A中的含量要求小于25×10－6 mol/mol才能有效降低装置操作成本。介绍国内某对二甲苯芳烃联合装置在抽余液塔改造前所遇到的问题、应用新型复合孔微型高效浮阀塔盘的设计情况和解决方案、改造后的运行工况。抽余液塔改造后经过一年半工业实际运行，负荷一直在100%以上，工况运行平稳，侧线C8A中的PDEB含量保持在小于<10×10－6 mol/mol或更低的好水平，产品纯度和回收率高，表明抽余液塔的改造能完全满足实际生产需要。

Application of minitype valve trays in raffinate column of aromatics complex

The raffinate column in the eluxyl unit of an aromatics complex is the key fractionator to separate C8 aromatics from para-diethyl benzene (PDEB). PDEB is expensive and only if the PDEB content in C8 aromatics side cut is less than 25×10-6 mol/mol, the operation cost could be lowered effectively. The article describes the problems before revamping, the design philosophy and solution for the application of minitype high efficiency valve tray, the performance test results after revamping, and the comparison of operation data before and after revamping in a domestic aromatics complex. After one year and a half commercial operation, the operation is stable and the load is over 100%. The PDEB content in C8A side cut is less than 10×10-6 mol/mol or even less, and the product purity and recovery can be kept high, which all indicate that the revamping of the raffinate column can meet the requirement of actual production.