PTA氧化残渣回收装置萃取过滤器优化改造

Optimization and Modification of the Extraction Filter of the PTA Oxidation Residue Recovery Device

摘要: 精对苯二甲酸氧化单元产生富含醋酸、TA、IPA、BA、PT酸的残渣，残渣进入资源化处置装置，利用甲苯作为萃取剂萃取氧化单元所产生残渣中的副产物苯甲酸BA、对羧基苯甲醛PT酸，固相TA、IPA通过萃取过滤器M-5003分离后进入干燥机进行干燥，油相即甲苯和苯甲酸的混合溶液通过真空精馏塔首先使甲苯与苯甲酸BA分离，塔顶馏出液为甲苯，塔底苯甲酸进入精馏塔提纯，最终通过冷却水切片机切片生产高纯度苯甲酸。萃取过滤器M-5003用于过滤分离对苯二甲酸和间苯二甲酸固相颗粒物，过滤后的滤饼经喷淋洗涤后，用氮气反吹至干燥机进行干燥，最终得到干燥的IPA副产物。本文以一套220万吨/年PTA装置为例，在甲苯萃取过滤单元，萃取过滤器M-5003设计处理能力为11 t/h，设计过滤周期为30 min，其中过滤时间为10 min，由于过滤器初始设计问题，导致过滤器运行时间缩短，滤饼下料不畅，过滤器整体负荷无法达到11 t/h，使资源化装置频繁停车检修，开工率较低，通过现场调研分析，提出一系列改造方案，最终使萃取过滤器处理能力满足设计要求。

Abstract: The oxidation unit produces the residue rich in acetic acid, ta, IPA, ba, pt acid, Resiresidue into the resource disposal device, The by-products benzoate ba, p-carboxybenzaldehyde pt acid in the residue produced by using toluene as the extraction agent, Solid phase ta, IPA are separated by extraction filter M-5003 and entered into the dryer for drying, The oil phase namely a mixed solution of toluene and benzoic acid was passed through a vacuum distillation to first separate the toluene from benzoic acid ba, The top distillation is toluene, Tower benzoic acid into benzoic acid into the distillation purification, High-purity benzoic acid was finally produced by cooling the water slicer slices. The extraction filter M-5003 is used to filter and separate the solid phase particles of terephthalic acid and resorphthalate. After the filter cake is sprayed, it is dried with nitrogen to dry the dried IPA by-product. This paper takes a set of 2.2 million ton/year PTA device as an example, in the toluene extraction filter unit, the design processing capacity of the extraction filter M-5003 is 11 t/h, the design filtration period is 30 min, and the filter time is 10min. Due to the initial design problems of the filter, the filter running time is shortened, the overall filter load can not reach 11 t/h, which makes the recycling device stop frequently for maintenance, and the operating rate is low. Through the field investigation and analysis, a series of transformation schemes are put forward, and finally the processing capacity of the extraction filter meet the design requirements.