Mechanistic and kinetic investigations in ultrasound assisted acid catalyzed biodiesel synthesis
► Mechanistic investigation of ultrasound enhanced acid catalyzed transesterification. ► Approach of coupling experiments with simulations of cavitation bubble dynamics. ► Anomalies of ultrasound assisted transesterification reaction observed. ► Physical effects of ultrasound and cavitation generate...
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| Veröffentlicht in: | Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2012-04, Vol.187, p.248-260 |
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| creator | Parkar, Priyanka A. Choudhary, Hanif A. Moholkar, Vijayanand S. |
| description | ► Mechanistic investigation of ultrasound enhanced acid catalyzed transesterification. ► Approach of coupling experiments with simulations of cavitation bubble dynamics. ► Anomalies of ultrasound assisted transesterification reaction observed. ► Physical effects of ultrasound and cavitation generate enormous interfacial area. ► Difference in cavitation bubble dynamics in oil and methanol responsible for anomalies.
This paper attempts to discern physical mechanism and kinetic aspects of ultrasound irradiation on transesterification of soybean oil with methanol using sulfuric acid as catalyst with approach of coupling experimental results with simulations of cavitation bubble dynamics. Kinetic constants as well as activation energies of transesterification reaction were determined at different alcohol to oil molar ratios and reaction temperatures. The results of this study reveal interesting features of inter–relation between mechanics of ultrasound/cavitation, and the intrinsic behavior (represented by specific rate constant) of the transesterification reaction. The beneficial effect of ultrasound irradiation on transesterification is of physical nature. Several anomalies of ultrasound assisted acid catalyzed transesterification (as compared to conventional system) are: occurrence of reaction at low temperature of 15°C (albeit with low conversions of 13.45% and 10.2% for alcohol to oil molar ratios of 6:1 and 12:1, respectively); despite higher activation energy, higher rate constant at low alcohol to oil molar ratio of 6:1; and minima shown by reaction rate constant with temperature. The major physical effect of sonication is fine emulsification that generates enormous interfacial area for reaction that overwhelms the effect of specific rate constant. As revealed by simulations, physical effects of cavitation (viz. micro-convection and shock waves) are more pronounced at low temperature, which is primary cause leading to these anomalies. |
| doi_str_mv | 10.1016/j.cej.2012.01.074 |
| format | Article |
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This paper attempts to discern physical mechanism and kinetic aspects of ultrasound irradiation on transesterification of soybean oil with methanol using sulfuric acid as catalyst with approach of coupling experimental results with simulations of cavitation bubble dynamics. Kinetic constants as well as activation energies of transesterification reaction were determined at different alcohol to oil molar ratios and reaction temperatures. The results of this study reveal interesting features of inter–relation between mechanics of ultrasound/cavitation, and the intrinsic behavior (represented by specific rate constant) of the transesterification reaction. The beneficial effect of ultrasound irradiation on transesterification is of physical nature. Several anomalies of ultrasound assisted acid catalyzed transesterification (as compared to conventional system) are: occurrence of reaction at low temperature of 15°C (albeit with low conversions of 13.45% and 10.2% for alcohol to oil molar ratios of 6:1 and 12:1, respectively); despite higher activation energy, higher rate constant at low alcohol to oil molar ratio of 6:1; and minima shown by reaction rate constant with temperature. The major physical effect of sonication is fine emulsification that generates enormous interfacial area for reaction that overwhelms the effect of specific rate constant. As revealed by simulations, physical effects of cavitation (viz. micro-convection and shock waves) are more pronounced at low temperature, which is primary cause leading to these anomalies.</description><identifier>ISSN: 1385-8947</identifier><identifier>EISSN: 1873-3212</identifier><identifier>DOI: 10.1016/j.cej.2012.01.074</identifier><language>eng</language><publisher>Oxford: Elsevier B.V</publisher><subject>Acid catalyst ; activation energy ; Applied sciences ; Biodiesel ; Catalysis ; Catalytic reactions ; Cavitation ; Chemical engineering ; Chemistry ; Colloidal state and disperse state ; emulsifying ; Exact sciences and technology ; General and physical chemistry ; Hydrodynamics of contact apparatus ; irradiation ; Kinetics ; mechanics ; methanol ; Physical and chemical studies. Granulometry. Electrokinetic phenomena ; Reactors ; Sonochemistry ; soybean oil ; sulfuric acid ; temperature ; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry ; Transesterification ; ultrasonics</subject><ispartof>Chemical engineering journal (Lausanne, Switzerland : 1996), 2012-04, Vol.187, p.248-260</ispartof><rights>2012 Elsevier B.V.</rights><rights>2015 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c449t-5a4219fd7e3bf48e2efc6cdde97536dddcdcc61f2e02852d2c73e4a9ec2120f53</citedby><cites>FETCH-LOGICAL-c449t-5a4219fd7e3bf48e2efc6cdde97536dddcdcc61f2e02852d2c73e4a9ec2120f53</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.cej.2012.01.074$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3548,27922,27923,45993</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=25785191$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Parkar, Priyanka A.</creatorcontrib><creatorcontrib>Choudhary, Hanif A.</creatorcontrib><creatorcontrib>Moholkar, Vijayanand S.</creatorcontrib><title>Mechanistic and kinetic investigations in ultrasound assisted acid catalyzed biodiesel synthesis</title><title>Chemical engineering journal (Lausanne, Switzerland : 1996)</title><description>► Mechanistic investigation of ultrasound enhanced acid catalyzed transesterification. ► Approach of coupling experiments with simulations of cavitation bubble dynamics. ► Anomalies of ultrasound assisted transesterification reaction observed. ► Physical effects of ultrasound and cavitation generate enormous interfacial area. ► Difference in cavitation bubble dynamics in oil and methanol responsible for anomalies.
This paper attempts to discern physical mechanism and kinetic aspects of ultrasound irradiation on transesterification of soybean oil with methanol using sulfuric acid as catalyst with approach of coupling experimental results with simulations of cavitation bubble dynamics. Kinetic constants as well as activation energies of transesterification reaction were determined at different alcohol to oil molar ratios and reaction temperatures. The results of this study reveal interesting features of inter–relation between mechanics of ultrasound/cavitation, and the intrinsic behavior (represented by specific rate constant) of the transesterification reaction. The beneficial effect of ultrasound irradiation on transesterification is of physical nature. Several anomalies of ultrasound assisted acid catalyzed transesterification (as compared to conventional system) are: occurrence of reaction at low temperature of 15°C (albeit with low conversions of 13.45% and 10.2% for alcohol to oil molar ratios of 6:1 and 12:1, respectively); despite higher activation energy, higher rate constant at low alcohol to oil molar ratio of 6:1; and minima shown by reaction rate constant with temperature. The major physical effect of sonication is fine emulsification that generates enormous interfacial area for reaction that overwhelms the effect of specific rate constant. As revealed by simulations, physical effects of cavitation (viz. micro-convection and shock waves) are more pronounced at low temperature, which is primary cause leading to these anomalies.</description><subject>Acid catalyst</subject><subject>activation energy</subject><subject>Applied sciences</subject><subject>Biodiesel</subject><subject>Catalysis</subject><subject>Catalytic reactions</subject><subject>Cavitation</subject><subject>Chemical engineering</subject><subject>Chemistry</subject><subject>Colloidal state and disperse state</subject><subject>emulsifying</subject><subject>Exact sciences and technology</subject><subject>General and physical chemistry</subject><subject>Hydrodynamics of contact apparatus</subject><subject>irradiation</subject><subject>Kinetics</subject><subject>mechanics</subject><subject>methanol</subject><subject>Physical and chemical studies. Granulometry. Electrokinetic phenomena</subject><subject>Reactors</subject><subject>Sonochemistry</subject><subject>soybean oil</subject><subject>sulfuric acid</subject><subject>temperature</subject><subject>Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry</subject><subject>Transesterification</subject><subject>ultrasonics</subject><issn>1385-8947</issn><issn>1873-3212</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2012</creationdate><recordtype>article</recordtype><recordid>eNp9kEFv1DAQhaMKpJbCD-BELohTgseJk1icUAW0UqseoGfjjsetl9Qpnmyl5dczq604cvIb63tPM6-q3oJqQcHwcdMibVqtQLcKWjX2R9UJTGPXdBr0C9HdZJrJ9uNx9Yp5o5QaLNiT6ucV4b3PideEtc-h_pUy7XXKTySfd35NS2YZ6-28Fs_LViDPLA4SgSnU6Fc_7_7IeJuWkIhprnmX13sS6nX1MvqZ6c3ze1rdfP3y4-y8ubz-dnH2-bLBvrdrY3yvwcYwUncb-4k0RRwwBLKj6YYQAgbEAaImpSejg8axo95bQrlPRdOdVh8OuY9l-b2V1d1DYqR59pmWLTs7TDCCNqOQcCCxLMyFonss6cGXnQPl9mW6jZMy3b5Mp8BJmeJ5_5zuGf0ci8-Y-J9RYicDFoR7d-CiX5y_K8LcfJcgoxQoo_o98elAkJTxlKg4xkQZKaRCuLqwpP_s8Rd94JW4</recordid><startdate>20120401</startdate><enddate>20120401</enddate><creator>Parkar, Priyanka A.</creator><creator>Choudhary, Hanif A.</creator><creator>Moholkar, Vijayanand S.</creator><general>Elsevier B.V</general><general>Elsevier</general><scope>FBQ</scope><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QO</scope><scope>7ST</scope><scope>8FD</scope><scope>C1K</scope><scope>FR3</scope><scope>P64</scope><scope>SOI</scope></search><sort><creationdate>20120401</creationdate><title>Mechanistic and kinetic investigations in ultrasound assisted acid catalyzed biodiesel synthesis</title><author>Parkar, Priyanka A. ; Choudhary, Hanif A. ; Moholkar, Vijayanand S.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c449t-5a4219fd7e3bf48e2efc6cdde97536dddcdcc61f2e02852d2c73e4a9ec2120f53</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2012</creationdate><topic>Acid catalyst</topic><topic>activation energy</topic><topic>Applied sciences</topic><topic>Biodiesel</topic><topic>Catalysis</topic><topic>Catalytic reactions</topic><topic>Cavitation</topic><topic>Chemical engineering</topic><topic>Chemistry</topic><topic>Colloidal state and disperse state</topic><topic>emulsifying</topic><topic>Exact sciences and technology</topic><topic>General and physical chemistry</topic><topic>Hydrodynamics of contact apparatus</topic><topic>irradiation</topic><topic>Kinetics</topic><topic>mechanics</topic><topic>methanol</topic><topic>Physical and chemical studies. Granulometry. Electrokinetic phenomena</topic><topic>Reactors</topic><topic>Sonochemistry</topic><topic>soybean oil</topic><topic>sulfuric acid</topic><topic>temperature</topic><topic>Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry</topic><topic>Transesterification</topic><topic>ultrasonics</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Parkar, Priyanka A.</creatorcontrib><creatorcontrib>Choudhary, Hanif A.</creatorcontrib><creatorcontrib>Moholkar, Vijayanand S.</creatorcontrib><collection>AGRIS</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Biotechnology Research Abstracts</collection><collection>Environment Abstracts</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Engineering Research Database</collection><collection>Biotechnology and BioEngineering Abstracts</collection><collection>Environment Abstracts</collection><jtitle>Chemical engineering journal (Lausanne, Switzerland : 1996)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Parkar, Priyanka A.</au><au>Choudhary, Hanif A.</au><au>Moholkar, Vijayanand S.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Mechanistic and kinetic investigations in ultrasound assisted acid catalyzed biodiesel synthesis</atitle><jtitle>Chemical engineering journal (Lausanne, Switzerland : 1996)</jtitle><date>2012-04-01</date><risdate>2012</risdate><volume>187</volume><spage>248</spage><epage>260</epage><pages>248-260</pages><issn>1385-8947</issn><eissn>1873-3212</eissn><abstract>► Mechanistic investigation of ultrasound enhanced acid catalyzed transesterification. ► Approach of coupling experiments with simulations of cavitation bubble dynamics. ► Anomalies of ultrasound assisted transesterification reaction observed. ► Physical effects of ultrasound and cavitation generate enormous interfacial area. ► Difference in cavitation bubble dynamics in oil and methanol responsible for anomalies.
This paper attempts to discern physical mechanism and kinetic aspects of ultrasound irradiation on transesterification of soybean oil with methanol using sulfuric acid as catalyst with approach of coupling experimental results with simulations of cavitation bubble dynamics. Kinetic constants as well as activation energies of transesterification reaction were determined at different alcohol to oil molar ratios and reaction temperatures. The results of this study reveal interesting features of inter–relation between mechanics of ultrasound/cavitation, and the intrinsic behavior (represented by specific rate constant) of the transesterification reaction. The beneficial effect of ultrasound irradiation on transesterification is of physical nature. Several anomalies of ultrasound assisted acid catalyzed transesterification (as compared to conventional system) are: occurrence of reaction at low temperature of 15°C (albeit with low conversions of 13.45% and 10.2% for alcohol to oil molar ratios of 6:1 and 12:1, respectively); despite higher activation energy, higher rate constant at low alcohol to oil molar ratio of 6:1; and minima shown by reaction rate constant with temperature. The major physical effect of sonication is fine emulsification that generates enormous interfacial area for reaction that overwhelms the effect of specific rate constant. As revealed by simulations, physical effects of cavitation (viz. micro-convection and shock waves) are more pronounced at low temperature, which is primary cause leading to these anomalies.</abstract><cop>Oxford</cop><pub>Elsevier B.V</pub><doi>10.1016/j.cej.2012.01.074</doi><tpages>13</tpages></addata></record> |
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| subjects | Acid catalyst activation energy Applied sciences Biodiesel Catalysis Catalytic reactions Cavitation Chemical engineering Chemistry Colloidal state and disperse state emulsifying Exact sciences and technology General and physical chemistry Hydrodynamics of contact apparatus irradiation Kinetics mechanics methanol Physical and chemical studies. Granulometry. Electrokinetic phenomena Reactors Sonochemistry soybean oil sulfuric acid temperature Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry Transesterification ultrasonics |
| title | Mechanistic and kinetic investigations in ultrasound assisted acid catalyzed biodiesel synthesis |
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