精对苯二甲酸浆料压力过滤滤饼洗涤、脱水特性的试验研究

THEORETICAL AND EXPERIMENTAL STUDY OF THE FILTER CAKE WASHING AND DRYING PERFORMANCE DURING PTA SLURRY PRESSURE FILTRATION

对精对苯二甲酸(PTA)浆料的压力过滤过程滤饼洗涤和脱水进行试验研究。对影响PTA滤饼洗涤及脱水的各因素进行分析,考察洗涤强度、洗涤量等操作参数对PTA滤饼洗涤效果的影响,获得PTA滤饼洗涤的数学模型;考察PTA滤饼脱水过程各操作参数对滤饼含湿率的影响,获得脱水时间、脱水压差等操作参数对PTA滤饼含湿率的影响规律。为开发PTA浆料一级压力过滤技术取代目前广泛使用的两级压力离心分离技术提供试验数据。

A theoretical and experimental study of the filter cake washing and drying performance during the pressure filtration of purified terephthalic acid （PTA） slurry was conducted. Factors affecting the filter cake washing and drying performance were analyzed theoretically. The influence of operating parameters, such as washing intensity and washing water amount on the washing effect was studied, and a mathematical model of PTA filter cake washing was developed. The influence of filter cake drying parameters, such as time and pressure, on the moisture content of filter cake was analyzed, and an affecting rule was obtained. These results will be helpful for the development of one-step PTA pressure filtration technology, which might replace the existed popular two-step PTA centrifugal separation technology in future.