Abstract: Soft impurities are widely present in organic solutions, and could have significant effects on filtration process. Soft impurities can be deformed to any angel under differential pressure, resulting in penetrating，plugging and other problems in the filtration system. An onsite testing method based on automatic differential pressure monitoring was described in this paper. This method is suitable for both solid and soft particles. Filtration power, a newly developed factor was introduced to indirectly express the content of soft impurities. It is regarded that soft impurities are higher when filtration power is higher while solid particle levels remains normal.

Key words: soft impurities, filtration quality, online test for filtrate quality

摘要： 柔性杂质广泛存在于有机高分子溶液中，对过滤的影响显著而独特，受力可产生几乎任意大的变形，导致滤除困难、系统堵塞等问题，因此柔性杂质的表征、过滤质量的检测均存在特殊困难。本文介绍了一种以压差自动测量为基础的滤液质量检测方法，既适用于固体杂质，也能够反映柔性杂质含量。同时还引入过滤功率的概念，用来间接表征物料中柔性杂质的含量。结果表明，若过滤功率异常升高且固体粒度未发生显著变化，表示物料中柔性杂质含量异常增高。

关键词: 柔性杂质, 过滤质量, 滤液质量在线检测