http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
( Md Sufi Ullah Siddik Bhuyan ),( Eun Hei Lee ),( Abul Hasnat Md Ashraful Alam ),( Soa Choi ),( Ruri Lee ),( Kwanghyeon Song ),( Yong Chan Seo ) 한국폐기물자원순환학회(구 한국폐기물학회) 2015 한국폐기물자원순환학회 심포지움 Vol.2015 No.2
Subcritical hydrolysis followed by methyl estrification was used to produce bio-diesel from low valued waste cooking oil at mild reaction conditions in this study. More than 90% fatty acid methyl esther (FAME) conversion was achieved by subcritical hydrolysis without using catalysts at 275℃ for 45 minutes. The highest conversion to linoleic acid (C18:2) was obtained at this condition. The higher content of free fatty acid (FFA) in waste cooking oil resulted in higher conversion to FAME. It was also observed more prominent at high temperature due to auto catalytic behavior of FFA. FAME yield found about 92% without using catalyst; whereas 98% yield was obtained using 80% TiO2 loading S-TiO<sub>2</sub>/MCM-41 catalyst at 220℃ and 20 minutes. The amount of FAME increased may be due to trans-esterification of un-reacted TG, DG, and MG with methanol remained during the hydrolysis stage. The higher FAME conversion means the better quality bio-diesel.
Md Sufi Ullah Siddik Bhuyan,Eun Hei Lee,Abul Hasnat MD Ashraful Alam,Soa Choi,Ruri Lee,Kwanghyeon Song,Yong Chan Seo 한국폐기물자원순환학회 2015 한국폐기물자원순환학회 학술대회 Vol.2015 No.11
Subcritical hydrolysis followed by methyl estrification was used to produce bio-diesel from low valued waste cooking oil at mild reaction conditions in this study. More than 90% fatty acid methyl esther (FAME) conversion was achieved by subcritical hydrolysis without using catalysts at 275℃ for 45 minutes. The highest conversion to linoleic acid (C18:2) was obtained at this condition. The higher content of free fatty acid (FFA) in waste cooking oil resulted in higher conversion to FAME. It was also observed more prominent at high temperature due to auto catalytic behavior of FFA. FAME yield found about 92% without using catalyst; whereas 98% yield was obtained using 80% TiO2 loading S-TiO2/MCM-41 catalyst at 220℃ and 20 minutes. The amount of FAME increased may be due to trans-esterification of un-reacted TG, DG, and MG with methanol remained during the hydrolysis stage. The higher FAME conversion means the better quality bio-diesel.
( Md Sufi Ullah Siddik Bhuyan ),( Eun Hei Lee ),( Abul Hasnat Md Ashraful Alam ),( Soa Choi ),( Ruri Lee ),( Kwanghyeon Song ),( Yong Chan Seo ) 한국폐기물자원순환학회(구 한국폐기물학회) 2015 한국폐기물자원순환학회 추계학술발표논문집 Vol.2015 No.-
Subcritical hydrolysis followed by methyl estrification was used to produce bio-diesel from low valued waste cooking oil at mild reaction conditions in this study. More than 90% fatty acid methyl esther (FAME) conversion was achieved by subcritical hydrolysis without using catalysts at 275℃ for 45 minutes. The highest conversion to linoleic acid (C18:2) was obtained at this condition. The higher content of free fatty acid (FFA) in waste cooking oil resulted in higher conversion to FAME. It was also observed more prominent at high temperature due to auto catalytic behavior of FFA. FAME yield found about 92% without using catalyst; whereas 98% yield was obtained using 80% TiO<sub>2</sub> loading S-TiO<sub>2</sub>/MCM-41 catalyst at 220℃ and 20 minutes. The amount of FAME increased may be due to trans-esterification of un-reacted TG, DG, and MG with methanol remained during the hydrolysis stage. The higher FAME conversion means the better quality bio-diesel.
( Md Sufi Ullah Siddik Bhuyan ),( Taeha Kim ),( Soa Choi ),( Ruri Lee ),( Kwanghyeon Song ),( Sunho Whang ),( Eunhee Lee ),( Younghwan Chu ),( Yongchan Seo ) 한국폐기물자원순환학회(구 한국폐기물학회) 2014 한국폐기물자원순환학회 심포지움 Vol.2014 No.2
Subcritical hydrolysis followed by methyl estrification was useful for the production of biodiesel from low valued waste cooking oil at mild reaction conditions in this study. More than 90 % FFA content was achieved by subcritical hydrolysis without using catalysts at 275℃, 45 min and linoleic acid (C18:2) composition observed the highest. The presence of the initial amount of free fatty acid (FFA) in waste cooking oil was accelerated the rate of reaction compared to the refined soybean oil. It is observed more prominent at high temperature due to auto catalytic behavior of FFA. FAME yield found about 92% without using catalyst; whereas 98% yield was obtained using 80% TiO<sub>2</sub> loading S-TiO<sub>2</sub>/MCM-41 catalyst at 220℃ and 20 minutes. The amount of FAME increased may be due to trans esterification of un reacted TG, DG and MG with methanol remained during the hydrolysis stage. The higher FAME yield was obtained relatively at low reaction conditions that would be given high quality biodiesel.
금속 촉매를 적용한 물의 subcritical 조건하에서 폐식용유의 가수분해공정에 대한 연구
김태하,( Md. Sufi Ullah Siddik Bhuyan ),송광현,신명철,이루리,최소아,서용찬,주영환 한국폐기물자원순환학회(구 한국폐기물학회) 2014 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2014 No.-
화석연료의 고갈에 따른 대체 연료의 등장에 대한 필요로 인하여 바이오디젤에 대한 연구가 활발하게 진행되고 있다. 현재 바이오디젤의 원료로 일반적으로 사용되는 식물성 오일의 경우 식용 오일을 연료로 사용함에 따르는 도덕적 문제와 더불어 높은 원료 가격으로 인한 생산비용의 상승문제 등의 문제점이 지적되고 있다. 이러한 문제점을 해결하기위한 방법으로 사용후 버려지는 폐식용 오일을 이용한 바이오 디젤 생산에 대한 연구가 활발하게 진행되고 있다. 폐식용유내에 존재하는 유리지방산(FFAs ; Free Fatty acids)을 제거하기위한 별도의 고순도화 공정없이 폐식용유를 바이오디젤을 생산하는 원료로 곧바로 투입할 수 있는 기술중의 하나로 폐식용유를 물의 subcritical 조건(150℃<T<370℃,0.4<p<22Mpa)에서 가수분해시켜 FFAs (Free Fatty Acids)로 변환시킨후 에스테르화 반응을 통해 바이오디젤을 생산하는 기술이 최근 소개되고 있다. 이 공정의 경우 반응조건(온도 및 압력)이 실제 공정을 구현하기에 가혹하다는 문제점이 지적되고 있다. 따라서 본 연구에서는 폐식용유를 물의 subcritical 조건에서 가수분해 시키는데 있어서 다양한 금속 촉매들을 반응 공정에 적용함을 통해 반응 조건을 완화시킬 수 있는 방법을 제안하고자한다. 각각의 방법에서 생성된 FFAs 의 분석을 위하여 산가(Acid Value), 비누화가(Saponification Value)를 측정하였고 이를 통해 FFAs의 전환율을 구하였다. 또한 생산된 FFAs의 성분 분석을 위해 기체크로마토그래피(GC - FID) 분석을 실시하였다.
Sungha Hong,Md. Sufi Ullah Siddik Bhuyan,Kwan Ju Lee,Myung chul shin,Yongchan Seo,Taeha Kim,Younghwan Chu 한국폐기물자원순환학회 2013 한국폐기물자원순환학회 학술대회 Vol.2013 No.2
Recently biodiesel has drawn much attraction as renewable enegy due to its environmental benefits and the fact that it is made from renewable resources. However, the production cost of biodiesel is one of the main hurdle to commercialize it. One of the way to reduce the biodiesel production cost is to use the waste cooking oil as feedstock. In the conventional transesterification process of waste cooking oils for biodiesel production, the presence of free fatty acids and water causes severe problems such as formation of soap and decreasing of catalyst yield. Much effort has been devoted to solve the above problems and one of the promising way is the supercritical methanol treatment which is performed at the methanol supercritical environment (>239.45℃, >8.10 Mpa)one of the serious problems of the application of SCM process for the biodiesel production is the tough operation condition(high pressure, high temperature. In this study, we have studied about the supercritical methanol treatment for the biodiesel production with the soybean waste cooking oil as a feedstock in the present of various heterogeneous solid catalysts such as mesoporous silica and acid-doped mesorpous silica. Biodiesel conversion was increased at more mild opreation condition to the previous studies by using the catalysts. The conversion was more enhanced by modifying the catalysts.
Hydrolysis of Waste Cooking Oil in Supercritical CO2
Taeha Kim,Younghwan Chu,Md. Sufi Ullah Siddik Bhuyan,Kwan Ju Lee,Myung chul shin,Sungha Hong,Yongchan Seo 한국폐기물자원순환학회 2013 한국폐기물자원순환학회 학술대회 Vol.2013 No.2
Hydrolysis of triacylglycerol(TAG) from fats and oils to glycerol and free fatty acid (FFA), also referred to as fat splitting, is an important reaction for the olechemical industry. Typically, hydrolysis is carried out at 100-260℃ and 100-7000 kPa using 0.4-0.15(w/w) initial water to oil ratio with or without catalysts. It is an endothermic reaction occurs in a stepwise manner where TAG is initially hydrolyzed to diacyglycerol (DAG) then to monoacylglycerol(MAG) and finally to glycerol. Water, in its subcritical state, can be used as both a solvent and reactant for the hydrolysis of triglycerides. subcritical water (150℃<T<370℃,0.4<p<22Mpa) can act as an acid or base catalyst. To investigate milder reaction conditions, in this study, waste cooking oil and fresh soybean oils will be hydrolyzed to free fatty acids with deionized water under SC CO2 medium in a batch reactor. Effects of the reaction temperature, time and solvent to feed ratio on FFA in the hydroysis at equilibrium will also observed for optimum conversion of oil. The reaction products will be analyzed by acid-base titration, GC FID and HPLC.
PO34 : Hydrolysis of Waste Cooking Oil in Supercritical CO2
( Tae Ha Kim ),( Md Sufi Ullah Siddik Bhuyan ),( Kwan Ju Lee ),( Myung Chul Shin ),( Sung Ha Hong ),( Yong Chan Seo ),( Young Hwan Chu ) 한국폐기물자원순환학회(구 한국폐기물학회) 2013 한국폐기물자원순환학회 심포지움 Vol.2013 No.4
Hydrolysis of triacylglycerol(TAG) from fats and oils to glycerol and free fatty acid (FFA), also referred to as fat splitting, is an important reaction for the olechemical industry. Typically, hydrolysis is carried out at 100-260℃ and 100-7000 kPa using 0.4-0.15(w/w) initial water to oil ratio with or without catalysts. It is an endothermic reaction occurs in a stepwise manner where TAG is initially hydrolyzed to diacyglycerol (DAG) then to monoacylglycerol(MAG) and finally to glycerol. Water, in its subcritical state, can be used as both a solvent and reactant for the hydrolysis of triglycerides. subcritical water (150℃<T<370℃,0.4< p<22Mpa) can act as an acid or base catalyst. To investigate milder reaction conditions, in this study, waste cooking oil and fresh soybean oils will be hydrolyzed to free fatty acids with deionized water under SC CO2 medium in a batch reactor. Effects of the reaction temperature, time and solvent to feed ratio on FFA in the hydroysis at equilibrium will also observed for optimum conversion of oil. The reaction products will be analyzed by acid-base titration, GC FID and HPLC.
( Sung Ha Hong ),( Tae Ha Kim ),( Md Sufi Ullah Siddik Bhuyan ),( Kwan Ju Lee ),( Myung Chul Shin ),( Young Hwan Chu ),( Yong Chan Seo ) 한국폐기물자원순환학회(구 한국폐기물학회) 2013 한국폐기물자원순환학회 심포지움 Vol.2013 No.4
Recently biodiesel has drawn much attraction as renewable enegy due to its environmental benefits and the fact that it is made from renewable resources. However, the production cost of biodiesel is one of the main hurdle to commercialize it. One of the way to reduce the biodiesel production cost is to use the waste cooking oil as feedstock. In the conventional transesterification process of waste cooking oils for biodiesel production, the presence of free fatty acids and water causes severe problems such as formation of soap and decreasing of catalyst yield. Much effort has been devoted to solve the above problems and one of the promising way is the supercritical methanol treatment which is performed at the methanol supercritical environment (>239.45oC, >8.10 Mpa)one of the serious problems of the application of SCM process for the biodiesel production is the tough operation condition(high pressure, high temperature. In this study, we have studied about the supercritical methanol treatment for the biodiesel production with the soybean waste cooking oil as a feedstock in the present of various heterogeneous solid catalysts such as mesoporous silica and acid-doped mesorpous silica. Biodiesel conversion was increased at more mild opreation condition to the previous studies by using the catalysts. The conversion was more enhanced by modifying the catalysts.