Abstract
A large amount of COG (coke oven gas) is produced from coking plants every year, which contains 55–60% H2. In this work, the breakthrough separation of H2 from COG with ZIF-8/ethylene glycol-water slurry was studied. Following the investigation of the (ab-ad)sorption isotherms of the single component gas CH4 and H2, the main components of coke oven gas, in different slurries and their corresponding viscosities, and the influence of the operating conditions on the dynamic performance of CH4/H2 separation in slurry were studied in a bubble column. Low temperature, inlet flow rate, high pressure, and solid content can extend the breakthrough time, where the longest breakthrough time interval between H2 and CH4 can be as long as 70 min, meaning the high purity of H2 product could be obtained easily. All the results of this work prove the feasibility of the slurry method to separate CH4/H2 mixture and provide a theoretical basis for practical industrial applications.
Highlights
Coal plays a vital role in meeting global energy needs and is critical to infrastructure development
The liquid solvent of the Zeolitic imidazolate frameworks (ZIFs)-8 slurry in this article is all at the above ratio
The content of ZIF-8 in slurry contributes to the increase of the viscosity of the slurry, which is an important physical property in industrial applications and has a great influence on the mass transfer rate and flow resistance
Summary
Coal plays a vital role in meeting global energy needs and is critical to infrastructure development. A huge amount of COG, about 7 × 1010 m3, is produced every year, but the majority was directly discharged into the atmosphere, causing serious environment pollution and a huge waste of energy resources. How to use it efficiently and reasonably is a significant issue related to environment protection, comprehensive resources utilization, energy conservation, and emission reduction. The utilization of COG mainly includes direct combustion, power generation, synthetic chemical materials [2,3], direct reduction iron production, and hydrogen and syn-gas production [4], etc. In terms of the technology of producing high-purity hydrogen from COG, it has become focused by researchers for its maturation and significant economic benefits, especially compared with the hydrogen production by water electrolysis [5]
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