Conversion of Aqueous Ethanol to Gasoline over HZSM-5 Zeolite
Date Issued
2010
Date
2010
Author(s)
Wu, Ting-Hsi
Abstract
The purpose of this study is using catalyst HZSM-5 (Si/Al=45) to convert aqueous ethanol to liquid type hydrocarbon. Four parameters including moisture content, weight hourly space velocity (WHSV), temperature and pressure were studied for the selectivity of products. Then the optimal ones were applied in the operating of long term reaction-regeneration experiments to examine the activity and efficiency of catalyst.
The results showed that, the selectivity of liquid products was affected by moisture content especially when the moisture content was over 60% (w/w). That is, in excess moisture content, it was not suitable for the dehydration of ethanol. Therefore, 72% (w/w) ethanol was selected for the optimal feeding in the study.
Furthermore, the more the WHSV, the shorter the contacting time in the reactor and in the meantime the incomplete polymerization made the selectivity of liquid products decreased. The yield of liquid products increased with the rising pressure. The catalyst deactivated and damaged due to the coke with high carbon on the surface.
In summary, the oil quality synthesized in this test was familiar with the commercial 95 unleaded gasoline from CPC. The optimal parameters were WHSV=4.30 h-1, 350˚C and 60 kg/cm2. The yield of liquid products and theoretical yield of hydrocarbon could be achieved 30.7% and 70% respectively. The long term reaction-regeneration experiments showed the catalyst activity could not be completely regenerated. It could provide over 10% the selectivity of liquid products by using both constant time and limited selectivity of liquid products as the indicators in comparing with that just using limited selectivity of liquid product as the indicator.
Subjects
HZSM-5
Methanol to gasoline
Ethanol to gasoline
Type
thesis
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