Abstract:

Polyarylester (PAR) is a high-performance specialty engineering plastic widely used in various industries. The mainstream synthesis method for PAR is interfacial polycondensation, favored for its mild reaction conditions, mature process and superior product performance. However, PAR produced by this method encounters significant post-processing challenges, especially during washing, which involves high water consumption and product losses. Therefore, optimizing the washing process to minimize water usage and product waste is critical. This study employed process simulation software to develop a PAR washing model. As the washing process involved two phases and multiple components, the built-in modules were inadequate for simulating the complex phase separation. To address this, a custom Fortran-based module was developed and integrated into the washing separation system, enabling phase separation calculations based on rigorous phase equilibrium mechanisms and facilitating the analysis of different washing methods' impacts on water consumption. This study proposed multi-stage crossflow and countercurrent washing methods, expanding on the traditional single-stage washing process. Simulation results identified the three-stage countercurrent washing method as the most cost-effective approach, reducing water consumption by 78.05% compared to the two-stage crossflow washing process.

Key words: polyarylester, washing, interfacial polymerization, simulation, optimization

摘要：

聚芳酯（PAR）是一种性能优异的特种工程塑料，广泛应用于各个行业中。目前，PAR主流的合成方法是界面缩聚法，因其反应条件温和、工艺成熟且产品性能优良而被广泛采用。然而，该方法合成的PAR产品在后处理过程中面临挑战，尤其是在洗涤环节，存在耗水量大和部分产品浪费等问题。因此，优化洗涤步骤以减少水耗和产品损失尤为重要。本文使用流程模拟软件建立了PAR洗涤模型，由于洗涤过程涉及两相多组分，且内置模块无法直接模拟复杂的洗涤相分离过程，因此在洗涤分离模块中基于Fortran语言开发并导入自定义模块，使其能够基于严格的相平衡机理进行分相计算，从而探讨不同洗涤方法对水耗的影响。基于传统的单级水洗工艺，本文提出了多级错流和逆流水洗工艺，并通过模拟确定了具有经济效益的工艺为三级逆流水洗工艺。结果显示，与两级错流水洗工艺相比，该工艺可节约78.05%的用水量。

关键词: 聚芳酯, 洗涤, 界面聚合, 模拟, 优化