Preparation of coconut shell-based carbon molecular sieves for air separation by pressure swing adsorption
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摘要: 提出以椰殼預炭化料為骨料、酚醛樹脂為黏結劑制備變壓吸附空分制氮用炭分子篩的新工藝路線，包括成型、炭化、水蒸氣活化、兩步苯氣相碳沉積調孔等主要工序；完善了炭分子篩的變壓吸附空分評價手段，即以變壓吸附空分為基本手段，結合變壓吸附脫附尾氣總量及其中O2濃度等參數分析，準確表征炭分子篩制備過程中樣品的微孔孔容和孔徑變化，從而實現對炭分子篩制備工藝參數的精確控制.所得的椰殼基炭分子篩具有較高的抗壓強度，其變壓吸附空分性能接近商業炭分子篩產品.Abstract: A novel process for preparation of a carbon molecular sieve (CMS) was proposed. With coconut shell char as a carbon precursor and phenol formaldehyde resin (PF) as a binder, the process consists of a series of stages, i. e., forming, carbonization, activation with steam, and two-step chemical vapor deposition with benzene as a carbon source. The CMS has been used as an adsorbent in pressure swing adsorption (PSA) of air for N2 production. The evaluation method of CMS based on PSA was developed by introducing a couple of analysis items including the amount of the effluent desorption gas in PSA and the O2 concentration in it. In this way, the development of the effective volume and size of the micropores of CMS during the preparation stages could be followed and controlled on purpose. The coconut shell-based CMS prepared by this method has a superior compressive strength and a comparable PSA performance to those commercial CMSs.
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Key words:
- carbon molecular sieves /
- pressure swing adsorption /
- coconut shells /
- air separation
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參考文獻
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