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以精制棉为原料,采用N-甲基吗啉-N-氧化物(NMMO)直接溶解纤维素,制备纤维素/NMMO/H2O溶液,添加碳化钨作为惰性增重剂,通过反相悬浮和程序降温制备成纤维素/碳化钨复合微球.结果表明,NMMO溶解法制备的纤维素/碳化钨复合微球球形度好,在介质中的密度达到1.6～2.4g/mL,孔度约为70%,平均孔径为25nm,比表面积为60～70m2/mL,微球粒径具有明显的对数正态分布.扩张床内扩张性能良好,Bo准数大于40,轴向扩散系数处于10-6数量级,床层稳定,可以作为扩张床吸附剂(EBA)的基质.与商业介质Streamline相比,在相同扩张率下,本文制备的扩张床基质可以用于较高的流速,满足扩张床吸附的高处理量要求.
Using refined cotton as raw material, cellulose was directly dissolved by using N-methylmorpholine-N-oxide (NMMO) to prepare a solution of cellulose / NMMO / H2O, adding tungsten carbide as inert weighting agent, The results showed that the sphericity of cellulose / tungsten carbide composite microspheres prepared by NMMO dissolution method was good, the density in the medium reached 1.6 ~ 2.4g / mL and the porosity was about 70 %, Average pore diameter of 25nm, specific surface area of 60 ~ 70m2 / mL, microspheres have a significant logarithmic normal distribution of particle size.The expansion of the expanded bed is good, the Bo criterion is greater than 40 and the axial diffusion coefficient is 10-6 Order of magnitude and stable bed, which can be used as the matrix of expanded bed adsorbent (EBA) .Compared with the commercial medium Streamline, the expanded bed matrix prepared in this paper can be used at higher flow rate to meet the requirements of expanded bed adsorption High throughput requirements.