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分子筛与固定吸附床在高效脱除甲基二乙醇胺（MDEA）及轻质石脑油净化方面的协同效应

Highly efficient methyldiethanolamine (MDEA) removal and light naphtha purification synergistic effect of molecular sieves and fixed adsorption bed.

作者信息

Zhang Bin, Bai Zhishan, Wang Bingjie, Luo Huiqing

机构信息

State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology Shanghai 200237 China

出版信息

RSC Adv. 2019 May 20;9(28):15727-15737. doi: 10.1039/c9ra00308h.

DOI:10.1039/c9ra00308h
PMID:35521399
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9064283/
Abstract

Light naphtha is an important raw material for the production of benzene, toluene, and xylene from cracking in tubular furnaces for the production of ethylene and propylene. Light naphtha contains MDEA which is left behind after desulfurization. MDEA remaining in light naphtha will cause high alkalinity of light naphtha, which decreases product quality and increases costs. Additionally, MDEA itself is not easy to degrade and is harmful to human skin, so the removal of MDEA is of great significance for the purification of light naphtha and the protection of the environment. In this paper, a molecular sieve (13X) is compared with silica gel and resin (NKA-9) as a means of removing MDEA from light naphtha synergism with a fixed adsorption bed. The adsorption capacity decreased in the order of 13X > NKA-9 > silica gel, with values of 53.189, 45.889 and 34.863 mg g, respectively. Similarly, the effectiveness of steam for 13X regeneration after adsorption saturation was investigated, and the steam regeneration restored 95% of the activity of the fresh 13X. Furthermore, the adsorption mechanism of MDEA in light naphtha by 13X was studied, and it was confirmed that the adsorption process was dominated by chemisorption, supplemented by physisorption. The -OH and -NH functional groups were the main groups involved in the chemisorption, and capillary action and hydrogen bond action may be involved in physisorption.

摘要

轻石脑油是管式炉裂解生产乙烯和丙烯过程中生产苯、甲苯和二甲苯的重要原料。轻石脑油含有脱硫后残留的甲基二乙醇胺（MDEA）。残留在轻石脑油中的MDEA会导致轻石脑油碱度升高，从而降低产品质量并增加成本。此外，MDEA本身不易降解，对人体皮肤有害，因此去除MDEA对轻石脑油的净化和环境保护具有重要意义。本文将分子筛（13X）与硅胶和树脂（NKA-9）进行比较，作为在固定吸附床中协同去除轻石脑油中MDEA的一种方法。吸附容量顺序为13X＞NKA-9＞硅胶，分别为53.189、45.889和34.863 mg/g。同样，研究了吸附饱和后蒸汽对13X再生的有效性，蒸汽再生恢复了新鲜13X活性的95%。此外，研究了13X对轻石脑油中MDEA的吸附机理，证实吸附过程以化学吸附为主，物理吸附为辅。-OH和-NH官能团是参与化学吸附的主要基团，物理吸附可能涉及毛细管作用和氢键作用。

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