Influence of p-Xylene (PX) Accumulation on the Operation of Pure Terephthalic Acid (PTA) Solvent Dehydratic Distillation Column
Influence of p-Xylene (PX) Accumulation on the Operation of Pure Terephthalic Acid (PTA) Solvent Dehydratic Distillation Column
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DOI：
10.1021/ie900526n
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发表时间：
2009-05
影响因子：
4.2
通讯作者：
Shaojun Li
中科院分区：
文献类型：
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作者：
Shaojun Li
在生产纯对苯二甲酸的过程中，少量的对二甲苯会通过进料流进入乙酸脱水精馏塔。在正常操作中，对二甲苯不会从塔顶或塔底产品中离开塔顶。它会积聚在脱水精馏塔和醒酒器的顶部。随着对二甲苯的积累，操作成本将逐渐增加，以保证上下产品的纯度规格。为了降低运行成本，有必要通过抽放部分有机回流来降低对二甲苯的浓度，并使纯夹带器间歇化。本文对不同浓度对二甲苯回流时的再沸器负荷进行了分析。提出了最佳操作条件，即当对二甲苯积累质量分数超过0.15时，通过排出部分有机回流降低对二甲苯的浓度。最后，给出了顶部3个关键分量的残差曲线图。
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 o...