biochemical conversion of rice straw into bioethanol

Biochemical conversion of rice straw into

bioethanolBy SREEREMYASMphil

LecturerMercy collegePalakkad

1048699Growing energy demands in transportation industrial and other sectors with a simulta-neousreduction of green house gas emissions

i) biomasses are geographically more evenly distributed than fossil fuels amphence the energy sourceswillbe domestic and provide security of supply

1048699ii) lignocellulosicwastes minimize the potential conflict between land use for food (and feed) and energy feedstock production

WHY BIOETANOL FROM BIOMASS

Rice straw( cellulose 37 hemicell-ulose24 amplignin(14)-an abundant biomass Production 731 million tonesannum -produce about 205 billion litrebioethanol

1048699Wheat and rice straw together 200 million tonnes annum in India

10486991 kg rice straw has 350 g of cellulose which depends upon variety and the geographical location This can theoret-icallyyield 220 g 283 ml ethanol

RICE STRAW-COMPOSITION amp PRODUCTION

Rice straw( Collected locally) washed and desoiledby froth-floatation in water air dried amp chopped into small pieces Partially delignifiedusing 4 NH4OH at 15 bar amp120oC for 20 min in an autoclave at a volume ratio of 54 Washed with hot water repeatedly till free from alkali

1048699NH4OHtreated rice straw is dipped in 1 sulphuricacid and autoclaved at 120oC for 15 min at 15 bar

PRETREATMENT OF RICE STRAW

saccharification-more effective in the combined successive acid and enzyme catalysis The sugar and ethanol yields are 10-12 more in this method compared to those with liquid enzymatic saccharification-cum-fermentation

CONCLUSIONS

This is due to better accessibility of the cellulose to cellulaseenzyme by the removal of hemicelluloseand lignin Substantiated by its faster thermal degradation in the temperature range 200-400oC and nearly complete degradation at 400oC in the former case

CONCLUSION

Biochemical conversion of rice straw into bioethanol

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CONCLUSIONS

CONCLUSION

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1048699Growing energy demands in transportation industrial and other sectors with a simulta-neousreduction of green house gas emissions












CONCLUSIONS


CONCLUSION


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CONCLUSIONS

CONCLUSION

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CONCLUSIONS


CONCLUSION


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CONCLUSIONS

CONCLUSION

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CONCLUSION


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CONCLUSIONS

CONCLUSION

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CONCLUSIONS

CONCLUSION

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biochemical conversion of rice straw into bioethanol

Environment

rice straw cellulose

nh4ohtreated rice straw

g of cellulose whichdepends

thermal degradation

nearlycomplete degradation

growing energy

energy feedstock production

ethanol yields are10