Conversion of Hydrated Ethanol to Gasoline over HZSM-5 Catalyst
Date Issued
2011
Date
2011
Author(s)
Wu, Jing-Yang
Abstract
Energy issue has attracted worldwide attention during the past half a century. In 1973, the oil crisis erupted. Many countries suffered huge economic loss because these countries were dependent on imports of fossil fuel resources. At the same time, Mobil developed the MTG (Methanol to gasoline) process. MTG process successfully converted methanol to gasoline range hydrocarbons using a zeolite catalyst. It provided a way for synthetic fuels production. Later, under the impact of oil shortage and the raise of environmental awareness, the developments of renewable energy were gradually emphasized. Among which bioethanol from biomass was the focus of developments.
In this study, we used HZSM-5 as catalyst to convert ethanol broth to gasoline range hydrocarbons, and we discussed the influences of the concentration of ethanol, feeding rate, temperature, and pressure on the yield and product distribution.
The optimal conditions for the formation of liquid hydrocarbons were as follows: water content 28% (w/w), WHSV 1 hr-1, temperature 350°C and partial pressure 60 kg/cm2. Under optimal conditions, the yield of liquid hydrocarbons reached 69.32%. Furthermore, in order to examine the effects of cleaning mechanism on the activity and efficiency of catalyst, long term reaction-regeneration experiments were performed under the conditions: water content 28% (w/w), WHSV 1 hr-1, temperature 350°C and partial pressure 5 kg/cm2.
The results showed that the ethanol flush program can effectively remove residual reactants left in the reactor. The ethanol flush program initiated before shutdown or regeneration. In that program, ethanol broth continuously fed and temperature was gradually reduced to 80°C, then helium was fed before the reactor was cooled to room temperature. After 210 hours reaction, the activity of catalysts was not reduced significantly. During the period of reaction, the liquid product yield remained at 48.88 ± 1.66%.
Subjects
Hydrated ethanol
zeolite catalyst
gasoline
hydrocarbon
regeneration
SDGs
Type
thesis
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