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Biochemical conversion of rice straw into bioethanol,THEIR PRETREATEMENT METHODS
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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
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
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
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
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
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
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