文献类型：期刊文献

英文题名：Influence of p-Xylene (PX) Accumulation on the Operation of Pure Terephthalic Acid (PTA) Solvent Dehydratic Distillation Column

作者：Li, Shaojun

机构：[1]E China Univ Sci & Technol, Inst Automat, Shanghai 200237, Peoples R China

年份：2009

卷号：48

期号：13

起止页码：6358

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000267379300049)】；

基金：This work is supported by Shanghai Leading Academic Discipline Project (under Project No. B504).

语种：英文

摘要：In the production of pure terephthalic acid, a tiny amount of reactant p-xylene may enter into the acetic acid dehydration distillation column through the feed stream. In normal operation, p-xylene will not leave the column from the top or bottom product. It will be accumulated in the top of dehydration distillation column and decanter. With the accumulation of p-xylene, the operation cost will be increased gradually, to ensure the purity specifications of the top and bottom products. To reduce the operation cost. it is necessary to cut down the concentration of p-xylene by draining some organic reflux and make up the pure entrainer intermittent. In this paper, reboiler duties at different concentrations of p-xylene in the reflux were analyzed. The optimal operation condition-that the concentration of p-xylene is decreased by draining some organic reflux when the mass fraction of p-xylene accumulation exceeds 0.15-had been suggested. Finally, the residue curves diagram of three key components in the top of the column was used to interpret the draining place of p-xylene.