5A吸附剂真空重量法吸附性能的研究

Study on the Measurement of 5A Adsorbent Adsorption Capacity by Vacuum Gravimetric Method

摘要: 以5A分子筛吸附剂为原料，采用真空重量法对吸附剂吸附性能进行了研究。考察了真空重量法的脱气温度、脱气时间、脱气真空度、吸附相对压力等重要因素对吸附量的影响。研究结果表明，脱气温度为350℃，脱气时间为3 h，脱气真空度 < 0.1 MPa、吸附环境温度和吸附温度为25℃，吸附相对压力P/P₀为0.1，样品吸附饱和后质量差值 < 0.1 mg为吸附终点。在该试验条件下，与原有高真空法相比较，更能简单、快捷、准确地评价5A脱腊分子筛吸附性能，能够满足对吸附剂吸附性能的评价及其质量控制的需求，更好地指导5A脱腊分子筛产品的研发和生产。

Abstract: The adsorption performance of 5A molecular sieve adsorbent is studied by using the vacuum gravimetric method. The influence of degassing temperature, degassing time, degassing vacuum degree, adsorption relative pressure and other important factors on the adsorption capacity by vacuum gravimetric method is studied. The results show that the degassing temperature is 350℃, degassing time is 3 h, degassing vacuum degree < 0.1 Mpa, adsorption ambient temperature and adsorption temperature are 25˚C, adsorption relative pressure P/P₀ is 0.1, the end point of the adsorption is when the sample adsorption reaches saturation and sample mass difference < 0.1 mg. Compared with the original high vacuum gravimetric method，under this test condition we can evaluate the adsorption performance of 5A dewaxing molecular sieves easier, faster and more accurate, which can satisfy the needs of adsorbent adsorption performance evaluation and quality control, make better guidance on the research and production of the 5A dewaxing molecular sieve product.