Graduate Thesis Or Dissertation

 

Henry's Law constants for pollutants from the wood industry in room temperature ionic liquids Public Deposited

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/qz20sv948

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  • The emission of organic compounds from wood manufacturing facilities is an important regulatory concern due to their effects on ambient air quality. Control technologies, such as oxidizers and biofiltration, are used to remove organics from air streams; however, most removal technologies have high costs or cause additional negative environmental impact. Room-temperature ionic liquids (RTILs) are liquid organic salts at ambient temperature and have the potential to be used to absorb organic compounds from airstreams. In this study, the Henry's Law constants were determined for methanol and a-pinene in four imidazolium-based RTILs (BMIN-BF₄, BMIN-PF₆, HMIN-PF₆, and OMIN-PF₆) and four phosphonium-based RTILs (IL105, TBPD, THPD, and lL106). This was done in the dry condition and with 2% water content. At 60°C, Henry's Law constants ranged from 0.04 to 0.13 for methanol and 0.01 to 0.04 for a-pinene (mole fraction units). The values increased as the temperature increased from 30°C to 90°C in accordance with the Van't Hoff equation. In some cases, the presence of water increased the Henry's Law constant. Imidazolium-based ILs were unstable when heated, especially in the presence of water and are not recommended as absorbents. Of the ILs tested, THPD was best absorbent for both methanol and a-pinene. The used RTILs containing contaminants can be recycled using high temperature and vacuum. The removal efficiency may reach 100%.
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