Incorporation of sweet sorghum Juice in the current dry-grind ethanol process for improved ethanol yields, energy saving, and water efficiency
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1 Incorporation of sweet sorghum Juice in the current dry-grind ethanol process for improved ethanol yields, energy saving, and water efficiency RCN Conference on Pan American Biofuels & Bioenergy Sustainability Recife, Brazil. Nana Baah Appiah-Nkansah Kealin Saul William Rooney Donghai Wang
2 Introduction
3 Ethanol production in the US Production, availability, and use of fuel ethanol is expected to increase. Energy Independence and Security Act of 2007
4 Varieties of Ethanol blended fuel exists in the US
5 Varieties of Ethanol blended fuel exists in the US
6
7 Sweet Sorghum
8 Stem juice is rich in fermentable sugar % sucrose, 9-33% glucose, and 6-21% fructose). Short period of growth period (140 days) Draught resistant. Higher biomass yield (45-80 t/ha). Environmentally friendly; Requires less fertilizer, water usage for cultivation.
9 Objective
10 To develop a new technology for the current ethanol industry using sweet sorghum juice for ethanol production - to improve ethanol yield; safe water; energy conservation.
11 Conventional Dry Grind Ethanol Production Process from Grain Sorghum E Cooking = 10-20% E Ethanol production
12 Methodology
13 Three phases 1. Varying sorghum grain flour loading
14 Three phases 1. Varying sorghum grain flour loading 2. Varying enzymatic hydrolyzing time
15 Three phases 1. Varying sorghum grain flour loading 2. Varying enzymatic hydrolyzing time 3. Raw starch hydrolysis (by GSHE) (An energy conserving alternative process)
16 Ethanol Fermentation of sweet sorghum with varying sorghum grain flour loading Grain Sorghum flour 0 g, 6 g, 9 g, 12 g, 15 g
17 Ethanol Fermentation of sweet sorghum with varying sorghum grain flour loading Grain Sorghum flour 0 g, 6 g, 9 g, 12 g, 15 g Sweet Sorghum juice (100 ml) Slurring
18 Ethanol Fermentation of sweet sorghum with varying sorghum grain flour loading Grain Sorghum flour 0 g, 6 g, 9 g, 12 g, 15 g Sweet Sorghum juice (100 ml) Slurring α-amylase (Liquozyme) 86 C, 60 min, 180 rpm
19 Ethanol Fermentation of sweet sorghum with varying sorghum grain flour loading Grain Sorghum flour 0 g, 6 g, 9 g, 12 g, 15 g Sweet Sorghum juice (100 ml) Slurring α-amylase (Liquozyme) Glucoamylase(Spirizyme) + Saccharomyces cerevisiae (Yeast) Liquefaction Simultaneous Saccharification & 86 C, 60 min, 180 C, 72 hours, 150 rpm
20 Ethanol Fermentation of sweet sorghum with varying sorghum grain flour loading Grain Sorghum flour 0 g, 6 g, 9 g, 12 g, 15 g Sweet Sorghum juice (100 ml) Slurring α-amylase (Liquozyme) Glucoamylase(Spirizyme) + Saccharomyces cerevisiae (Yeast) Liquefaction Simultaneous Saccharification & 86 C, 60 min, 180 C, 72 hours, 150 rpm Drying Distillation DDGS Ethanol
21 Ethanol Fermentation of sweet sorghum with varying sorghum grain flour loading Grain Sorghum flour 0 g, 6 g, 9 g, 12 g, 15 g Sweet Sorghum juice (100 ml) Slurring α-amylase (Liquozyme) Glucoamylase(Spirizyme) + Saccharomyces cerevisiae (Yeast) Liquefaction Simultaneous Saccharification & 86 C, 60 min, 180 C, 72 hours, 150 rpm Drying Distillation DDGS Ethanol
22 Results
23 Means in the same column followed by different superscript letters indicate significant differences (P 0.05) Ethanol yeild (v/v) Juice Only J + 6 g J + 9 g J + 12 g J + 15 g Control Fermentation Time (hrs) Juice sugar content (%) Flour starch content (%) Juice only Juice + 6 g flour Juice + 9 g flour Juice+ 12 g four Juice + 15 g flour Theoretical ethanol yield (V/V) Actual Ethanol yield (V/V) Ethanol fermentation efficiency (%) a b b a c b d c e d 28.5 % Control- 30 g flour (db) b d
24 Grain Sorghum flour 4 Samples (15 g) Sweet Sorghum juice (100 ml) Slurring α-amylase (Liquozyme) Glucoamylase(Spirizyme) + Saccharomyces cerevisiae (Yeast) Liquefaction Simultaneous Saccharification & 86 C, min, 180 C, 72 hours, 150 rpm Drying Distillation DDGS Ethanol
25 Ethanol Yied (v/v) J+15g'30 min J+15g'45 min J+15g'60 min J+15g'90 min Fermentation time (hrs) Hydrolysis time (min) Juice sugar content (%) Flour starch content (%) Theoretical ethanol yield (V/V) Actual Ethanol yield (V/V) Ethanol fermentation efficiency (%) a c a c a a a b Means in the same column followed by different superscript letters indicate significant differences (P 0.05).
26 Low temperature hydrolysis
27 Low Energy Ethanol Production Process Granular Hydrolyzing Starch Enzyme
28 Ethanol Fermentation by Granular Starch Hydrolyzing Enzyme (No Cooking) Grain Sorghum flour 0 g, 6 g, 9 g, 12 g, 15 g Sweet Sorghum juice (100 ml) Slurring GHSE (Stargen 002) 48 C, 2 hours, 180 rpm Saccharomyces cerevisiae (Yeast) Simultaneous Saccharification & C, 72 hours, 150 rpm Drying Distillation DDGS Ethanol
29 Ethanol Yeild (v/v) Juice Only J+6 J+9 J+12 J Fermentation Time (hrs) Juice sugar content (%) Flour starch content (%) Theoretical ethanol yield (V/V) Actual Ethanol yield (V/V) Ethanol fermentation efficiency (%) Juice only a a Juice + 6 g flour b b Juice + 9 g flour c b Juice + 12 g flour d c Juice + 15 g flour e d Means in the same column followed by different superscript letters indicate significant differences (P 0.05).
30 Conclusion
31 Ethanol yield : 28% higher than conventional ethanol method. Enzymatic hydrolysis time reduced by 30 minutes. Strong potential for ethanol production from by granular starch hydrolyzing enzyme.
32 Acknowledgment This material is based upon work supported by National Science Foundation Grant: From Crops to Commuting: Integrating the Social, Technological, and Agricultural Aspects of Renewable and Sustainable Biorefining (I-STAR); NSF Award No.: DGE
33
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