间/对混酚分离技术的研究进展

间/对甲酚沸点十分接近,难以通过常规方法分离,这一问题已成为制约煤焦油粗酚精制发展的瓶颈.为此,笔者系统介绍了近年来常用的间/对混酚分离提纯技术,包括烷基化法、络合分离法、结晶分离法、模拟移动床吸附分离技术及膜分离技术等.通过对不同分离技术的优点和缺点进行分析和评估提出:烷基化法是目前最成熟的间/对混酚分离工业化方案,...

Research Progress on m/p-CresolsSeparation Process and Technology

It is difficult to separate m- and p- cresols byconventional methods due to their very close boiling points. This has been thebottleneck for the technology development of crude phenols refining from coaltar. Different m/p-cresols separationtechnologies developed in recent years were thoroughly reviewed, includingalkylation, complexation, crystallization, simulated moving bed adsorptionseparation and membrane separation technologies. After analysis and evaluationof the above processes and technologies, it is concluded that alkylation is themost mature technology at present, but the processing energy consumption ishigh. For the simulated moving bed adsorption separation technology, it ispromising for large-scale separation of m/p-cresolsin the future, however, selectivity and adsorption capacity of adsorbents stillneed to be improved. Therefore, research on the separation technology of m/p-cresols in the next stage shouldfocus on development and optimization of separation materials and separationprocesses. In addition, m/p-cresolsseparation technology should be integrated with separation technology ofphenolic compounds from coal tar to develop a comprehensive high value-addedcoal chemical industry chain from coal tar to produce refined phenolic products.