Effect of C3-Alcohol Impurities on Alumina-Catalyzed Bioethanol Dehydration to Ethylene: Experimental Study and Reactor Modeling
The impact of feedstock impurities on catalytic process is among the crucial issues for processing real raw materials. A real and model 92%-bioethanol contaminated with 0.03–0.3% mol 1-propanol or 2-propanol were used to make ethylene on a proprietary alumina catalyst in isothermal flow reactor. We...
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MDPI AG
2023-03-01
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| Series: | Catalysts |
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| Online Access: | https://www.mdpi.com/2073-4344/13/3/509 |
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| author | Elena V. Ovchinnikova Sardana P. Banzaraktsaeva Maria A. Kovgan Victor A. Chumachenko |
| author_facet | Elena V. Ovchinnikova Sardana P. Banzaraktsaeva Maria A. Kovgan Victor A. Chumachenko |
| author_sort | Elena V. Ovchinnikova |
| collection | DOAJ |
| description | The impact of feedstock impurities on catalytic process is among the crucial issues for processing real raw materials. A real and model 92%-bioethanol contaminated with 0.03–0.3% mol 1-propanol or 2-propanol were used to make ethylene on a proprietary alumina catalyst in isothermal flow reactor. We proposed a formal kinetic model to describe the impure bioethanol conversion to ethylene and byproducts and used it to evaluate the multi-tubular reactor (<i>MTR</i>) for 60 KTPA ethylene production. The simulated data agree well with experimental results. Under reaction-controlled conditions, C3-alcohols strongly suppress the formation of by-products and ethylene-from-ethanol, and slightly inhibit the formation of ethylene-via-ether. It is the suppression of the ethylene-via-ether route that causes a decrease in ethanol conversion. The predominant formation of ethylene-via-ether results in an increased ethylene yield but doubling the catalyst load is required to achieve conversion as for pure feedstock. 2-Propanol has a stronger effect on dehydration than 1-propanol. Diffusion inside the grain’s levels out the effect of C3-alcohols on the process in <i>MTR</i>, giving an ethylene yield as high as ~98% while dehydrating a contaminated 92% ethanol. However, impurities dilute ethanol and generate propylene (which contaminates target product), and these worsen feedstock consumption and ethylene productivity in <i>MTR.</i> |
| first_indexed | 2024-03-11T06:47:38Z |
| format | Article |
| id | doaj.art-6b37752af5b2491093defc50a127efb1 |
| institution | Directory Open Access Journal |
| issn | 2073-4344 |
| language | English |
| last_indexed | 2024-03-11T06:47:38Z |
| publishDate | 2023-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Catalysts |
| spelling | doaj.art-6b37752af5b2491093defc50a127efb12023-11-17T10:10:25ZengMDPI AGCatalysts2073-43442023-03-0113350910.3390/catal13030509Effect of C3-Alcohol Impurities on Alumina-Catalyzed Bioethanol Dehydration to Ethylene: Experimental Study and Reactor ModelingElena V. Ovchinnikova0Sardana P. Banzaraktsaeva1Maria A. Kovgan2Victor A. Chumachenko3Boreskov Institute of Catalysis SB-RAS, 5, Lavrentiev Ave., Novosibirsk 630090, RussiaBoreskov Institute of Catalysis SB-RAS, 5, Lavrentiev Ave., Novosibirsk 630090, RussiaBoreskov Institute of Catalysis SB-RAS, 5, Lavrentiev Ave., Novosibirsk 630090, RussiaBoreskov Institute of Catalysis SB-RAS, 5, Lavrentiev Ave., Novosibirsk 630090, RussiaThe impact of feedstock impurities on catalytic process is among the crucial issues for processing real raw materials. A real and model 92%-bioethanol contaminated with 0.03–0.3% mol 1-propanol or 2-propanol were used to make ethylene on a proprietary alumina catalyst in isothermal flow reactor. We proposed a formal kinetic model to describe the impure bioethanol conversion to ethylene and byproducts and used it to evaluate the multi-tubular reactor (<i>MTR</i>) for 60 KTPA ethylene production. The simulated data agree well with experimental results. Under reaction-controlled conditions, C3-alcohols strongly suppress the formation of by-products and ethylene-from-ethanol, and slightly inhibit the formation of ethylene-via-ether. It is the suppression of the ethylene-via-ether route that causes a decrease in ethanol conversion. The predominant formation of ethylene-via-ether results in an increased ethylene yield but doubling the catalyst load is required to achieve conversion as for pure feedstock. 2-Propanol has a stronger effect on dehydration than 1-propanol. Diffusion inside the grain’s levels out the effect of C3-alcohols on the process in <i>MTR</i>, giving an ethylene yield as high as ~98% while dehydrating a contaminated 92% ethanol. However, impurities dilute ethanol and generate propylene (which contaminates target product), and these worsen feedstock consumption and ethylene productivity in <i>MTR.</i>https://www.mdpi.com/2073-4344/13/3/509bioethanol to ethylene dehydrationalumina catalystpropanol impuritieskinetic modelmathematical simulationmulti-tubular fixed-bed reactor |
| spellingShingle | Elena V. Ovchinnikova Sardana P. Banzaraktsaeva Maria A. Kovgan Victor A. Chumachenko Effect of C3-Alcohol Impurities on Alumina-Catalyzed Bioethanol Dehydration to Ethylene: Experimental Study and Reactor Modeling Catalysts bioethanol to ethylene dehydration alumina catalyst propanol impurities kinetic model mathematical simulation multi-tubular fixed-bed reactor |
| title | Effect of C3-Alcohol Impurities on Alumina-Catalyzed Bioethanol Dehydration to Ethylene: Experimental Study and Reactor Modeling |
| title_full | Effect of C3-Alcohol Impurities on Alumina-Catalyzed Bioethanol Dehydration to Ethylene: Experimental Study and Reactor Modeling |
| title_fullStr | Effect of C3-Alcohol Impurities on Alumina-Catalyzed Bioethanol Dehydration to Ethylene: Experimental Study and Reactor Modeling |
| title_full_unstemmed | Effect of C3-Alcohol Impurities on Alumina-Catalyzed Bioethanol Dehydration to Ethylene: Experimental Study and Reactor Modeling |
| title_short | Effect of C3-Alcohol Impurities on Alumina-Catalyzed Bioethanol Dehydration to Ethylene: Experimental Study and Reactor Modeling |
| title_sort | effect of c3 alcohol impurities on alumina catalyzed bioethanol dehydration to ethylene experimental study and reactor modeling |
| topic | bioethanol to ethylene dehydration alumina catalyst propanol impurities kinetic model mathematical simulation multi-tubular fixed-bed reactor |
| url | https://www.mdpi.com/2073-4344/13/3/509 |
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