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国际农业工程大会

作者： Fei Yu Roger Ruan Yuhuan Liu Paul Chen Xiangyang Lin Shaobo Deng Erik Hare Vance Morey Tom Yang Caishui Chen Chengmei Liu and Yingyu GaoBiosystems and Agricultural Engineering University of Minnesota St. Paul MN 55108 USAThe Key Laboratory of Food Science of MOE Nanchang University Jiangxi 330047 China. US Army Natick Solider Center Natick MA 01760 USA.

＜正＞ In this study, corn stover was liquefied in acidic conditions, and several polymer materials were subsequently prepared from the liquefied mass. The effectual solvent for the liquefaction process was selected, and the influence of various liquefaction conditions was also investigated. The polyols from the liquefaction were then separated and purified through a series of processes, such as dilution, pH adjustment, filtration, evaporation and ozonolysis. Processes for

关键词： Corn stover Liquefaction ethylene carbonate ethylene glycol bio-polyol biopolymer.

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Effects of Temperature and Concentration on the Rheological Behavior of Polyacrylamide-Based Polymers

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Journal of Chemistry and Chemical Engineering 2014年第5期8卷 535-543页

作者： Joselisse Soares de Carvaiho Santos Marcia Maria Lima Duarte Eduardo Lins de Barros Neto Department of Chemical Engineering Federal University of Rio Grande do Norte Lagoa Nova 59078-970 Brasil

Polymers are high molecular weight molecules that provide high viscosity at low concentrations to the media they are inserted. In the oil industry, they are used for enhanced oil recovery and for drilling fluids, where its viscosity is an important factor for a greater efficiency. From all the polymers used by industry, the polyacrylamide and the biopolymer.xantham gum are those, which appear significantly in those applications. Taking that into consideration, this work intends to study the effects of the physical, chemical and structural parameters of those polymers in their rheological behaviour, by varying their concentrations from 400 ppm to 2,000 ppm and their temperatures from 298 K to 328 K, which are values similar to those found in the field. For that, a Brookfield Viscometer-Brookfield Engineering Labs rheometer was used. The results acquired showed that the increase on the polyacrylamides ionicity generates and increase on the medium viscosity. For the temperature, its increase causes a reduction of viscosity for the low ionicity polyacrylamides, while increases the viscosity for the high ionicity ones. In the comparative study between xantham gum and polyacrylamides, it was possible to notice that, even though the biopolymer.is more complex, its viscosity still is lower when compared to the polyacrylamides.

关键词： Rheology of polymer polyacrylamide biopolymer.

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