ПАРОФАЗНИЙ СИНТЕЗ ЛАКТИДУ З ЕТИЛЛАКТАТУ НА TiO2/SiO2-КАТАЛIЗАТОРI
The lactide is monomer for production of polylac- tide – biodegradable polymer that use as an ecological packagingmaterial. In an industry the two-stage lactide synthesis is applied. At first, lactic acid condenses into the oligomer using Sn-octanoate catalyst, then oligo- mer depolymerizes to lacti...
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V.I.Vernadsky Institute of General and Inorganic Chemistry
2019
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oai:ojs2.1444248.nisspano.web.hosting-test.net:article-66 |
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| institution |
Ukrainian Chemistry Journal |
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2019-08-16T10:36:33Z |
| collection |
OJS |
| language |
English |
| topic |
ethyl lactate lactide supported catalysts titanium dioxide. |
| spellingShingle |
ethyl lactate lactide supported catalysts titanium dioxide. Brei, Volodymyr Varvarin, A Levytska, Svetlana Glushchuk, Ya ПАРОФАЗНИЙ СИНТЕЗ ЛАКТИДУ З ЕТИЛЛАКТАТУ НА TiO2/SiO2-КАТАЛIЗАТОРI |
| topic_facet |
ethyl lactate lactide supported catalysts titanium dioxide. ethyl lactate lactide supported catalysts titanium dioxide. ethyl lactate lactide supported catalysts titanium dioxide. |
| format |
Article |
| author |
Brei, Volodymyr Varvarin, A Levytska, Svetlana Glushchuk, Ya |
| author_facet |
Brei, Volodymyr Varvarin, A Levytska, Svetlana Glushchuk, Ya |
| author_sort |
Brei, Volodymyr |
| title |
ПАРОФАЗНИЙ СИНТЕЗ ЛАКТИДУ З ЕТИЛЛАКТАТУ НА TiO2/SiO2-КАТАЛIЗАТОРI |
| title_short |
ПАРОФАЗНИЙ СИНТЕЗ ЛАКТИДУ З ЕТИЛЛАКТАТУ НА TiO2/SiO2-КАТАЛIЗАТОРI |
| title_full |
ПАРОФАЗНИЙ СИНТЕЗ ЛАКТИДУ З ЕТИЛЛАКТАТУ НА TiO2/SiO2-КАТАЛIЗАТОРI |
| title_fullStr |
ПАРОФАЗНИЙ СИНТЕЗ ЛАКТИДУ З ЕТИЛЛАКТАТУ НА TiO2/SiO2-КАТАЛIЗАТОРI |
| title_full_unstemmed |
ПАРОФАЗНИЙ СИНТЕЗ ЛАКТИДУ З ЕТИЛЛАКТАТУ НА TiO2/SiO2-КАТАЛIЗАТОРI |
| title_sort |
парофазний синтез лактиду з етиллактату на tio2/sio2-каталiзаторi |
| title_alt |
VAPOR-PHASE SYNTHESIS OF LACTIDE FROM ETHYL LACTATE OVER TiO2/SiO2 CATALYST ПАРОФАЗНЫЙ СИНТЕЗ ЛАКТИДА ИЗ ЭТИЛЛАКТАТА НА TiO2/SiO2-КАТАЛИЗАТОРЕ |
| description |
The lactide is monomer for production of polylac- tide – biodegradable polymer that use as an ecological packagingmaterial. In an industry the two-stage lactide synthesis is applied. At first, lactic acid condenses into the oligomer using Sn-octanoate catalyst, then oligo- mer depolymerizes to lactide. The drawbacks of this liquid-phase method are a significant amount of by- products — dimers and trimers of lactic acid and low lactide yield.Now a direct vapor-phase condensation of lactic acid and its esters to lactide is considered as alternative to the industrial process. One-stage lactide obtaining and use of solid catalysts are advantages of such method. In this work, the vapor-phase transfor- mation of ethyl lactate over supported TiO2/SiO2 and TiO2/Al2O3 oxides in nitrogen flow at 200–300 °С
was studied. The oxide samples were obtained by impregnating silica gel and γ -alumina with an approp- riate amount of titanium tetrabutoxide solution in iso- propanol, then dried at 80 oC, and finally calcined at 500 oC in air for 4 h. The catalysts were characterized by BET method, X-ray diffraction and UV-Vis diffuse reflectance spectroscopy. Catalytic experi- ments were carried out in a steel flow reactor at 200
–270 °С and atmospheric pressure. The load on a ca-talyst was varied in the interval of 8.2–36.4 mmol ethyllactate/(gcat⋅ h) that corresponds gas hourly space velo- city of the mixture of ethyl lactate and nitrogen of 1230–1490 h–1. It was shown that TiO2/SiO2 with5 wt.% content of titanium dioxide provides 48 % conversion of ethyl lactate with selectivity and pro- ductivity towards lactide 74 % and 7.0 mmol/(gcat⋅ h)at 270 °C, respectively. It was found thatTiO2/SiO2 is more efficiently for lactide producing (STY = 6.2 mmol/(gcat⋅ h) compared to TiO2/Al2O3catalyst (STY =1.8 mmol/(gcat⋅ h). It was shown that spent TiO2/ SiO2 catalyst fully restores activity after regenerati- on in air at 500 °С for 2 h. The two-stage scheme of ethyl lactate condensation with the participation of coordina- tion-unsaturated titanium ions is discussed. |
| publisher |
V.I.Vernadsky Institute of General and Inorganic Chemistry |
| publishDate |
2019 |
| url |
https://ucj.org.ua/index.php/journal/article/view/66 |
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AT breivolodymyr vaporphasesynthesisoflactidefromethyllactateovertio2sio2catalyst AT varvarina vaporphasesynthesisoflactidefromethyllactateovertio2sio2catalyst AT levytskasvetlana vaporphasesynthesisoflactidefromethyllactateovertio2sio2catalyst AT glushchukya vaporphasesynthesisoflactidefromethyllactateovertio2sio2catalyst AT breivolodymyr parofaznyjsintezlaktidaizétillaktatanatio2sio2katalizatore AT varvarina parofaznyjsintezlaktidaizétillaktatanatio2sio2katalizatore AT levytskasvetlana parofaznyjsintezlaktidaizétillaktatanatio2sio2katalizatore AT glushchukya parofaznyjsintezlaktidaizétillaktatanatio2sio2katalizatore AT breivolodymyr parofaznijsintezlaktiduzetillaktatunatio2sio2katalizatori AT varvarina parofaznijsintezlaktiduzetillaktatunatio2sio2katalizatori AT levytskasvetlana parofaznijsintezlaktiduzetillaktatunatio2sio2katalizatori AT glushchukya parofaznijsintezlaktiduzetillaktatunatio2sio2katalizatori |
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2025-09-24T17:43:31Z |
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oai:ojs2.1444248.nisspano.web.hosting-test.net:article-662019-08-16T10:36:33Z VAPOR-PHASE SYNTHESIS OF LACTIDE FROM ETHYL LACTATE OVER TiO2/SiO2 CATALYST ПАРОФАЗНЫЙ СИНТЕЗ ЛАКТИДА ИЗ ЭТИЛЛАКТАТА НА TiO2/SiO2-КАТАЛИЗАТОРЕ ПАРОФАЗНИЙ СИНТЕЗ ЛАКТИДУ З ЕТИЛЛАКТАТУ НА TiO2/SiO2-КАТАЛIЗАТОРI Brei, Volodymyr Varvarin, A Levytska, Svetlana Glushchuk, Ya ethyl lactate, lactide, supported catalysts, titanium dioxide. ethyl lactate, lactide, supported catalysts, titanium dioxide. ethyl lactate, lactide, supported catalysts, titanium dioxide. The lactide is monomer for production of polylac- tide – biodegradable polymer that use as an ecological packagingmaterial. In an industry the two-stage lactide synthesis is applied. At first, lactic acid condenses into the oligomer using Sn-octanoate catalyst, then oligo- mer depolymerizes to lactide. The drawbacks of this liquid-phase method are a significant amount of by- products — dimers and trimers of lactic acid and low lactide yield.Now a direct vapor-phase condensation of lactic acid and its esters to lactide is considered as alternative to the industrial process. One-stage lactide obtaining and use of solid catalysts are advantages of such method. In this work, the vapor-phase transfor- mation of ethyl lactate over supported TiO2/SiO2 and TiO2/Al2O3 oxides in nitrogen flow at 200–300 °С was studied. The oxide samples were obtained by impregnating silica gel and γ -alumina with an approp- riate amount of titanium tetrabutoxide solution in iso- propanol, then dried at 80 oC, and finally calcined at 500 oC in air for 4 h. The catalysts were characterized by BET method, X-ray diffraction and UV-Vis diffuse reflectance spectroscopy. Catalytic experi- ments were carried out in a steel flow reactor at 200 –270 °С and atmospheric pressure. The load on a ca-talyst was varied in the interval of 8.2–36.4 mmol ethyllactate/(gcat⋅ h) that corresponds gas hourly space velo- city of the mixture of ethyl lactate and nitrogen of 1230–1490 h–1. It was shown that TiO2/SiO2 with5 wt.% content of titanium dioxide provides 48 % conversion of ethyl lactate with selectivity and pro- ductivity towards lactide 74 % and 7.0 mmol/(gcat⋅ h)at 270 °C, respectively. It was found thatTiO2/SiO2 is more efficiently for lactide producing (STY = 6.2 mmol/(gcat⋅ h) compared to TiO2/Al2O3catalyst (STY =1.8 mmol/(gcat⋅ h). It was shown that spent TiO2/ SiO2 catalyst fully restores activity after regenerati- on in air at 500 °С for 2 h. The two-stage scheme of ethyl lactate condensation with the participation of coordina- tion-unsaturated titanium ions is discussed. The lactide is monomer for production of polylac- tide – biodegradable polymer that use as an ecological packagingmaterial. In an industry the two-stage lactide synthesis is applied. At first, lactic acid condenses into the oligomer using Sn-octanoate catalyst, then oligo- mer depolymerizes to lactide. The drawbacks of this liquid-phase method are a significant amount of by- products — dimers and trimers of lactic acid and low lactide yield.Now a direct vapor-phase condensation of lactic acid and its esters to lactide is considered as alternative to the industrial process. One-stage lactide obtaining and use of solid catalysts are advantages of such method. In this work, the vapor-phase transfor- mation of ethyl lactate over supported TiO2/SiO2 and TiO2/Al2O3 oxides in nitrogen flow at 200–300 °С was studied. The oxide samples were obtained by impregnating silica gel and γ -alumina with an approp- riate amount of titanium tetrabutoxide solution in iso- propanol, then dried at 80 oC, and finally calcined at 500 oC in air for 4 h. The catalysts were characterized by BET method, X-ray diffraction and UV-Vis diffuse reflectance spectroscopy. Catalytic experi- ments were carried out in a steel flow reactor at 200 –270 °С and atmospheric pressure. The load on a ca-talyst was varied in the interval of 8.2–36.4 mmol ethyllactate/(gcat⋅ h) that corresponds gas hourly space velo- city of the mixture of ethyl lactate and nitrogen of 1230–1490 h–1. It was shown that TiO2/SiO2 with5 wt.% content of titanium dioxide provides 48 % conversion of ethyl lactate with selectivity and pro- ductivity towards lactide 74 % and 7.0 mmol/(gcat⋅ h)at 270 °C, respectively. It was found thatTiO2/SiO2 is more efficiently for lactide producing (STY = 6.2 mmol/(gcat⋅ h) compared to TiO2/Al2O3catalyst (STY =1.8 mmol/(gcat⋅ h). It was shown that spent TiO2/ SiO2 catalyst fully restores activity after regenerati- on in air at 500 °С for 2 h. The two-stage scheme of ethyl lactate condensation with the participation of coordina- tion-unsaturated titanium ions is discussed. The lactide is monomer for production of polylac- tide – biodegradable polymer that use as an ecological packagingmaterial. In an industry the two-stage lactide synthesis is applied. At first, lactic acid condenses into the oligomer using Sn-octanoate catalyst, then oligo- mer depolymerizes to lactide. The drawbacks of this liquid-phase method are a significant amount of by- products — dimers and trimers of lactic acid and low lactide yield.Now a direct vapor-phase condensation of lactic acid and its esters to lactide is considered as alternative to the industrial process. One-stage lactide obtaining and use of solid catalysts are advantages of such method. In this work, the vapor-phase transfor- mation of ethyl lactate over supported TiO2/SiO2 and TiO2/Al2O3 oxides in nitrogen flow at 200–300 °С was studied. The oxide samples were obtained by impregnating silica gel and γ -alumina with an approp- riate amount of titanium tetrabutoxide solution in iso- propanol, then dried at 80 oC, and finally calcined at 500 oC in air for 4 h. The catalysts were characterized by BET method, X-ray diffraction and UV-Vis diffuse reflectance spectroscopy. Catalytic experi- ments were carried out in a steel flow reactor at 200 –270 °С and atmospheric pressure. The load on a ca-talyst was varied in the interval of 8.2–36.4 mmol ethyllactate/(gcat⋅ h) that corresponds gas hourly space velo- city of the mixture of ethyl lactate and nitrogen of 1230–1490 h–1. It was shown that TiO2/SiO2 with5 wt.% content of titanium dioxide provides 48 % conversion of ethyl lactate with selectivity and pro- ductivity towards lactide 74 % and 7.0 mmol/(gcat⋅ h)at 270 °C, respectively. It was found thatTiO2/SiO2 is more efficiently for lactide producing (STY = 6.2 mmol/(gcat⋅ h) compared to TiO2/Al2O3catalyst (STY =1.8 mmol/(gcat⋅ h). It was shown that spent TiO2/ SiO2 catalyst fully restores activity after regenerati- on in air at 500 °С for 2 h. The two-stage scheme of ethyl lactate condensation with the participation of coordina- tion-unsaturated titanium ions is discussed. V.I.Vernadsky Institute of General and Inorganic Chemistry 2019-08-15 Article Article Physical chemistry Физическая xимия Фізична xімія application/pdf https://ucj.org.ua/index.php/journal/article/view/66 10.33609/0041-6045.85.7.2019.31-37 Ukrainian Chemistry Journal; Vol. 85 No. 7 (2019): Ukrainian Chemistry Journal; 31-37 Украинский химический журнал; Том 85 № 7 (2019): Украинский химический журнал; 31-37 Український хімічний журнал; Том 85 № 7 (2019): Український хімічний журнал; 31-37 2708-129X 2708-1281 en https://ucj.org.ua/index.php/journal/article/view/66/41 |