有序介孔材料上水合物法富集低浓度煤层气甲烷

项目名称： 有序介孔材料上水合物法富集低浓度煤层气甲烷

项目编号： No.21206108

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 化学工程及工业化学

项目作者： 孙艳

作者单位： 天津大学

项目金额： 25万元

中文摘要： 我国低浓度抽放煤层气规模不等且分散，很难集中利用，传统技术难以分离且极不经济。本项目利用水合物促进剂（如四氢呋喃等）和纳米尺度空间吸附势场的双重催化作用，在有序介孔材料孔内形成水合物，利用甲烷与氮气和氧气水合物生成压的较大差异，控制煤层气的操作压力，使其满足甲烷水合物的生成压力，而氮气和氧气的分压低于各自水合物的生成压力,从而强化甲烷/空气的分离。研究将制备系列具有不同表面性质的介孔材料，采用孔径调节等手段构建合理的纳米尺度空间，通过对纯组分气体和模拟煤层气水合物生成和解析过程的平衡研究和动力学研究，建立热力学和动力学模型，探讨纳米空间内水合物分离机理，明确各因素对产品气甲烷纯度和收率的影响。以填充促进剂水溶液的有序介孔材料为高效甲烷/空气分离剂，将水合物分离原理引入变压吸附分离工艺，实现低浓度煤层气甲烷富集的连续运行。

中文关键词： 煤层气甲烷；水合物；分离；介孔材料；水合物促进剂

英文摘要： The usage of methane captured from gas drainage in operational mines is very difficult because of the low concentration of methane and the scattered location of mines. Low temperature rectify,as a conventional method,is not economical. PSA is supported to be a good choice for its low investment, flexible maneuverability and low energy cost. But the main problem, low selectivity of adsorbent, is not resolved. The present project proposes a new method for the separation of methane, nitrogen and oxygen in the ordered mesoporous materials on the basic of different formation pressure of gas hydrate. The operational pressure of coalbed gas is controlled to make the partial pressure of methane reach the pressure at which methane hydrate forms, and the partial pressures of nitrogen and oxygen are lower than the pressures at which their hydrate form. This work uses mesoporous materials whose pores are filled with accelerant aqueous solution as high selective reagents. With the co-catalysis of accelerant（such as tetrahydrofuran） and adsorption potential field in nanospace, the formation pressure of gas hydrate decreases and the velocity of hydrate formation and decomposition speed up. The present work tunes up the pore size of ordered mesoporous material to build up an appropriate nanospace and selects the species and con

英文关键词： Coalbed Methane；Hydrates；Separation；Mesoporous Materials；Hydrate Accelerants