본 연구에서는 바이오디젤 제조를 위한 원료로서 커피찌꺼기(spent coffee grounds, SCG)를 이용하였다. SCG에서 추출한 오일은 바이오디젤 생산을 위한 반응조건을 최적화하고자 한다. SCG의 오일 함량은 15~17%이고 오일의 acid value(AV)는 6.6 mgKOH/g, 유리지방산(free fatty acid, FFA) 3.3%이었다. 높은 FFA함량을 낮추기 위해 H2SO4를 이용한 ...
본 연구에서는 바이오디젤 제조를 위한 원료로서 커피찌꺼기(spent coffee grounds, SCG)를 이용하였다. SCG에서 추출한 오일은 바이오디젤 생산을 위한 반응조건을 최적화하고자 한다. SCG의 오일 함량은 15~17%이고 오일의 acid value(AV)는 6.6 mgKOH/g, 유리지방산(free fatty acid, FFA) 3.3%이었다. 높은 FFA함량을 낮추기 위해 H2SO4를 이용한 산 촉매 에스테르화 방법과 포화 NaOH 알칼리촉매 전처리 방법을 비교하였다. 산 촉매 에스테르화 방법과 알칼리촉매 방법의 FFA 제거율은 각각 78.4, 81.7%이고 수율은 98, 65%였다. 반응표면분석법으로 산 촉매 전처리 방법의 주요 인자들을 최적화하였다. 최적반응조건은 0.87% H2SO4, 21.2% methanol, 74.7℃이고, 이 조건에서 예상되는 AV는 1.40 mgKOH/g (FFA 0.7%)이다. 이 모델의 R2은 0.9899로 신뢰도가 높았다. 전처리한 SCG 오일은 NaOH, KOH, CH3ONa를 이용하여 알칼리 촉매 에스테르화 반응에 의해 바이오디젤로 전환시킨 결과, KOH가 가장 효율적이었다. 최적조건인 메탄올/오일 6:1, 1.25% KOH, 65℃에서 생성된 fatty acid methyl ester 함량을 정량한 결과 97~98% 전환율을 보였다. 오일 추출 후 잔여물을 산가수분해하여 당분석한 결과, 주요 당성분(g/g)은 glucose 9.8, galactose 11.8, mannose 30.6으로써 타 발효산업의 탄소원으로 이용 가능하리라 사료된다.
본 연구에서는 바이오디젤 제조를 위한 원료로서 커피찌꺼기(spent coffee grounds, SCG)를 이용하였다. SCG에서 추출한 오일은 바이오디젤 생산을 위한 반응조건을 최적화하고자 한다. SCG의 오일 함량은 15~17%이고 오일의 acid value(AV)는 6.6 mgKOH/g, 유리지방산(free fatty acid, FFA) 3.3%이었다. 높은 FFA함량을 낮추기 위해 H2SO4를 이용한 산 촉매 에스테르화 방법과 포화 NaOH 알칼리촉매 전처리 방법을 비교하였다. 산 촉매 에스테르화 방법과 알칼리촉매 방법의 FFA 제거율은 각각 78.4, 81.7%이고 수율은 98, 65%였다. 반응표면분석법으로 산 촉매 전처리 방법의 주요 인자들을 최적화하였다. 최적반응조건은 0.87% H2SO4, 21.2% methanol, 74.7℃이고, 이 조건에서 예상되는 AV는 1.40 mgKOH/g (FFA 0.7%)이다. 이 모델의 R2은 0.9899로 신뢰도가 높았다. 전처리한 SCG 오일은 NaOH, KOH, CH3ONa를 이용하여 알칼리 촉매 에스테르화 반응에 의해 바이오디젤로 전환시킨 결과, KOH가 가장 효율적이었다. 최적조건인 메탄올/오일 6:1, 1.25% KOH, 65℃에서 생성된 fatty acid methyl ester 함량을 정량한 결과 97~98% 전환율을 보였다. 오일 추출 후 잔여물을 산가수분해하여 당분석한 결과, 주요 당성분(g/g)은 glucose 9.8, galactose 11.8, mannose 30.6으로써 타 발효산업의 탄소원으로 이용 가능하리라 사료된다.
In this study, spent coffee grounds were used for manufacturing biodiesel. Reaction conditions of oil extracted from SCG was aimed at optimizing for manufacturing biodiesel. The oil content of SCG was 15 to 17%, the acid value (AV) of this oil was 6.6 mgKOH/g and free fatty acid (FFA) content was 3....
In this study, spent coffee grounds were used for manufacturing biodiesel. Reaction conditions of oil extracted from SCG was aimed at optimizing for manufacturing biodiesel. The oil content of SCG was 15 to 17%, the acid value (AV) of this oil was 6.6 mgKOH/g and free fatty acid (FFA) content was 3.3%. In order to reduce the high FFA content, pretreatment method with H2SO4 acid catalyst and pretreatment method with NaOH alkali catalyst were compared. Rate of reduction for FFA by acid catalyzed esterification method and alkali catalyst pretreatment method were 78.4% and 81.7% each and the yield rate were 98% and 65%. Major factors in acid catalyzed esterification method were optimized using response surface methodology (RSM). Optimal response condition was at sulfuric acid of 0.87%, methanol of 21.2 and 74.7℃, AV expected under this condition was 1.40 mgKOH/g (FFA of 0.7%). Coefficient of determination of this model was 0.9899 which indicates high reliability. As a result of converting pretreatment SCG oil to biodiesel by alkali-catalyzed transesterification using NaOH, KOH and CH3ONa, KOH was proven to be the most efficient. Also, as a result of weighing fatty acid methyl ester(FAME) content generated at optimal condition which was methanol to oil molar ratio of 6:1, KOH of 1.25% and 65℃, conversion rate was 97~98%. After analyzing the sugars from residues after the oil extraction by acid hydrolysis, major sugar components (g/g) were glucose 9.8, galactose 11.8 and mannose 30.6. Therefore, SCG was considered that it can be used as a carbon resource at other fermentation industry.
In this study, spent coffee grounds were used for manufacturing biodiesel. Reaction conditions of oil extracted from SCG was aimed at optimizing for manufacturing biodiesel. The oil content of SCG was 15 to 17%, the acid value (AV) of this oil was 6.6 mgKOH/g and free fatty acid (FFA) content was 3.3%. In order to reduce the high FFA content, pretreatment method with H2SO4 acid catalyst and pretreatment method with NaOH alkali catalyst were compared. Rate of reduction for FFA by acid catalyzed esterification method and alkali catalyst pretreatment method were 78.4% and 81.7% each and the yield rate were 98% and 65%. Major factors in acid catalyzed esterification method were optimized using response surface methodology (RSM). Optimal response condition was at sulfuric acid of 0.87%, methanol of 21.2 and 74.7℃, AV expected under this condition was 1.40 mgKOH/g (FFA of 0.7%). Coefficient of determination of this model was 0.9899 which indicates high reliability. As a result of converting pretreatment SCG oil to biodiesel by alkali-catalyzed transesterification using NaOH, KOH and CH3ONa, KOH was proven to be the most efficient. Also, as a result of weighing fatty acid methyl ester(FAME) content generated at optimal condition which was methanol to oil molar ratio of 6:1, KOH of 1.25% and 65℃, conversion rate was 97~98%. After analyzing the sugars from residues after the oil extraction by acid hydrolysis, major sugar components (g/g) were glucose 9.8, galactose 11.8 and mannose 30.6. Therefore, SCG was considered that it can be used as a carbon resource at other fermentation industry.
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