Abstract

Methanol conversion to dimethyl ether using alumina-modified silica gel based adsorbents was studied. ASM, ASM VS, BASF KC-Trockenperlen H, BASF KC-Trockenperlen WS, and NIAP-AOS adsorbents used in industrial adsorption installations for natural gas treatment were tested. The composition and structural characteristics of the commercial adsorbents were characterized by X-ray fluorescence and X-ray diffraction analysis and by low-temperature nitrogen adsorption and were correlated with the catalytic activity. The dependences of the concentration of the dimethyl ether formed on the reaction temperature and carrier gas flow rate through the adsorbents were determined. Methanal, diethyl ether, acetone, methyl acetate, and ethanol were identified as by-products of methanol conversion on the tested adsorbents. The results of thermocatalytic transformations of methanol on the adsorbents demonstrated good prospects for using ASM silica gel modified with 4.6% aluminum oxide for natural gas treatment in industry; its use allows reduction of the methanol emission to the atmosphere. At 290°С and flow rate of nitrogen containing 197 ± 3 mg L^–1 methanol of 1200 mL min^–1, the methanol conversion on ASM 1 adsorbent reached 91 wt %, and the dimethyl ether yield reached 49 wt %.

中文翻译：

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氧化铝改性硅胶对甲醇转化二甲醚的催化活性

摘要

研究了使用氧化铝改性硅胶基吸附剂将甲醇转化为二甲醚。测试了用于天然气处理工业吸附装置的 ASM、ASM VS、BASF KC-Trockenperlen H、BASF KC-Trockenperlen WS 和 NIAP-AOS 吸附剂。商业吸附剂的组成和结构特征通过 X 射线荧光和 X 射线衍射分析以及低温氮气吸附表征，并与催化活性相关。确定了形成的二甲醚浓度对反应温度和通过吸附剂的载气流速的依赖性。甲醇、乙醚、丙酮、乙酸甲酯和乙醇被确定为测试吸附剂上甲醇转化的副产物。甲醇在吸附剂上的热催化转化结果表明，4.6%氧化铝改性的ASM硅胶在工业上用于天然气处理具有良好的前景；它的使用可以减少甲醇排放到大气中。在 290°С 和含 197 ± 3 mg L 氮气的流速下^–1甲醇为 1200 mL min ^–1，ASM 1 吸附剂上的甲醇转化率达到 91 wt%，二甲醚产率达到 49 wt%。