炼油技术与工程 ›› 2025, Vol. 55 ›› Issue (4): 19-22.

• 加工工艺 • 上一篇    下一篇

PX装置重质解吸剂工艺与轻质解吸剂工艺对比分析

于天然   

  1. 中石化广州工程有限公司，广东省广州市 510620
  • 收稿日期:2024-12-08 出版日期:2025-04-15 发布日期:2025-04-21
  • 作者简介:于天然，工程师，硕士，主要从事石油化工领域的工程设计工作。联系电话：020-22193440，E-mail: yutianran.lpec@sinopec.com。

Comparative analysis of heavy desorbent process and light desorbent process in PX plant

Yu Tianran   

  1. SINOPEC Guangzhou Engineering Co., Ltd., Guangzhou, Guangdong 510620
  • Received:2024-12-08 Online:2025-04-15 Published:2025-04-21

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摘要：

从装置组成和规模、塔系设置及操作条件、热集成、能耗等方面对比了重质解吸剂工艺与轻质解吸剂工艺在PX装置中的应用。与传统重质解吸剂工艺相比，轻质解吸剂工艺的热集成中心由2个二甲苯塔改为抽余液塔和A8再蒸馏塔，不设置解吸剂再蒸馏塔；异构化分馏和二甲苯分馏流程优化整合，取消脱庚烷塔和异构化汽提塔，提供甲苯、二甲苯两个温位的热源，热联合方案更加合理，适应性更强，重质解吸剂工艺PX产品能耗为183.91 kgoe/t，轻质解吸剂工艺PX产品能耗为153.86 kgoe/t，能耗降低了16.3%。

关键词: PX装置, 重质解吸剂, 轻质解吸剂, 规模比值, 塔系, 热集成, 加热炉, 能耗

Abstract:

In this paper, the application of heavy desorption process and light desorption process in PX plant is compared from the aspects of unit composition and scale, column configuration and operating conditions, heat integration, and energy consumption. Compared with the traditional heavy desorption process, the thermal integration center of the light desorption process has been changed from two xylene columns to a raffinate column and A8 redistillation column, and no desorption agent redistillation column has been set up. Optimizing and integrating isomerization fractionation and xylene fractionation processes, eliminating deheptanizer and isomerization stripper, and providing two heat sources for toluene and xylene. The thermal combination scheme is more reasonable and adaptable. The energy consumption of the heavy desorption process for PX products is 183.91 kgoe/t, while that of the light desorption process is 153.86 kgoe/t, which reduces the energy consumption by 30%.

Key words: PX plant, heavy desorbent, light desorbent, scale ratio, column configuration, heat integration, heat furnace, energy consumption