Starch- g-poly(vinyl alcohol) as a compatibilizing agent for reducing the phase separation rates of polyvinyl alcohol/starch pastes has been investigated by blending and dissolving the two polymers in distilled water....Starch- g-poly(vinyl alcohol) as a compatibilizing agent for reducing the phase separation rates of polyvinyl alcohol/starch pastes has been investigated by blending and dissolving the two polymers in distilled water. The separation rates were quantitatively evaluated by the term of initiul demixing time. The grafted starches, with a series of grafting ratios, were prepared by grafting a number of vinyl acetate onto granular cornstarch in aqueous dispersion and then alcoholating in methanol. It was found that the addition of small amounts of starch- g poly (vinyl alcohol ) in the size compositions can effectively decrease the separation rates of the blended pastes in comparison to pure starch/PVA ones.Moreover, the influence of the grafting ratio, starch content, and PVA variety on the separation rates was also studied.展开更多
Ethanol production from starchy cereal grains is increasing rapidly due to increasing demand for alternative fuels.In Canada,wheat is the primary feedstock in ethanol plants.To improve the productivity of the ethanol ...Ethanol production from starchy cereal grains is increasing rapidly due to increasing demand for alternative fuels.In Canada,wheat is the primary feedstock in ethanol plants.To improve the productivity of the ethanol plants in terms of product quality and yield,debranning of wheat grains may be employed.Debranning is advantageous in two ways.Firstly,bran removal increases the starch content of the feedstock,improving the fermentation efficiency of the ethanol plants.Secondly,bran,a valuable co-product can be used as an animal feed ingredient.In this study,experiments to optimize the debranning process were carried out using two kinds of abrasive equipment,the Satake and the TADD(tangential abrasive dehulling device)mills.Wheat samples(30 and 200 g)were debranned in the Satake mill at 1215,1412,and 1515 r/min rotational speeds,30,36,and 40 grit sizes,and 30,60,and 90 s retention times,and in the TADD mill at 900 r/min rotational speed,30,36,50,and 80 grit sizes,and 120,180,240,and 300 s retention times.In addition to debranning efficiency,the starch separation efficiencies of the two mills were calculated in different debranning conditions.In the Satake mill,the 30 g and 200 g sample size,1412 r/min and 1515 r/min rotational speeds,all grit sizes,and 60 s of retention time demonstrated the highest debranning efficiency.Correspondingly,optimal results in the TADD mill were obtained with 200 g sample size,900 r/min rotational speed,50 and 80 grit sizes,and 180 s and 240 s retention times.However,based on the experimental results,Satake mill provided better debranning values compared to the TADD mill.The starch separation efficiency values supported these results.展开更多
基金It was financially supported by China Postdoctoral Science Foundation[1995]No.7
文摘Starch- g-poly(vinyl alcohol) as a compatibilizing agent for reducing the phase separation rates of polyvinyl alcohol/starch pastes has been investigated by blending and dissolving the two polymers in distilled water. The separation rates were quantitatively evaluated by the term of initiul demixing time. The grafted starches, with a series of grafting ratios, were prepared by grafting a number of vinyl acetate onto granular cornstarch in aqueous dispersion and then alcoholating in methanol. It was found that the addition of small amounts of starch- g poly (vinyl alcohol ) in the size compositions can effectively decrease the separation rates of the blended pastes in comparison to pure starch/PVA ones.Moreover, the influence of the grafting ratio, starch content, and PVA variety on the separation rates was also studied.
基金The financial support for this project was through the Feed Opportunities in the Bioethanol Industries(FOBI)network under the Agricultural Bioproducts Innovation Program(ABIP)of Agriculture and Agri-FoodCanada.
文摘Ethanol production from starchy cereal grains is increasing rapidly due to increasing demand for alternative fuels.In Canada,wheat is the primary feedstock in ethanol plants.To improve the productivity of the ethanol plants in terms of product quality and yield,debranning of wheat grains may be employed.Debranning is advantageous in two ways.Firstly,bran removal increases the starch content of the feedstock,improving the fermentation efficiency of the ethanol plants.Secondly,bran,a valuable co-product can be used as an animal feed ingredient.In this study,experiments to optimize the debranning process were carried out using two kinds of abrasive equipment,the Satake and the TADD(tangential abrasive dehulling device)mills.Wheat samples(30 and 200 g)were debranned in the Satake mill at 1215,1412,and 1515 r/min rotational speeds,30,36,and 40 grit sizes,and 30,60,and 90 s retention times,and in the TADD mill at 900 r/min rotational speed,30,36,50,and 80 grit sizes,and 120,180,240,and 300 s retention times.In addition to debranning efficiency,the starch separation efficiencies of the two mills were calculated in different debranning conditions.In the Satake mill,the 30 g and 200 g sample size,1412 r/min and 1515 r/min rotational speeds,all grit sizes,and 60 s of retention time demonstrated the highest debranning efficiency.Correspondingly,optimal results in the TADD mill were obtained with 200 g sample size,900 r/min rotational speed,50 and 80 grit sizes,and 180 s and 240 s retention times.However,based on the experimental results,Satake mill provided better debranning values compared to the TADD mill.The starch separation efficiency values supported these results.
