The rehydration of dehydrated products of boehmite with different textural morphology calcined at the temperature below 1000℃ is investigated by XRD and SEM.It is found that every dehydrated alumina is capable of bei...The rehydration of dehydrated products of boehmite with different textural morphology calcined at the temperature below 1000℃ is investigated by XRD and SEM.It is found that every dehydrated alumina is capable of being rehydratied and the rehydration product is boehmite. Rehydrates with different textural morphology have been produced from aluminas with different textural morphology, and the textural morphology of a rehydrate depends both on the starting alumina and on the hydrothermal conditions.The rehydration ability of aluminas is determined by their textural morphology and calcined temperature. Aluminas are directly rehydrated to rehydrate and the rehydration process is not the reverse. Process of the dehydration of the initial boehmite.展开更多
Dehydrated sorghum flour （＂ogi＂） is useful as additional ingredient in certain food and pharmaceutical formulation, this could be obtained by soaking sorghum in water for 3 to 4 days, wet milling the soaked materi...Dehydrated sorghum flour （＂ogi＂） is useful as additional ingredient in certain food and pharmaceutical formulation, this could be obtained by soaking sorghum in water for 3 to 4 days, wet milling the soaked material, and fermentation for another 3 to 4 days. Typically, the fermented product is boiled into a pap or cooked into a stiff porridge. However, the fermented product can not be easily handled or stored and does not have a long shelf life （typically less than a week）. Dehydrating the fermented product into flour is one of the ways that is being employed to overcome these problems. Equilibrium moisture content （EMC） of dehydrated sorghum flour （aka ＂ogi＂） was therefore determined at two temperatures of 25℃ and 40℃ and four salt solutions. Zinc chloride （ZnCl2）, potassium acetate （KC2H3O2）, calcium chloride （CaCl2） and sodium chloride （NaCl） salts were prepared to correspond to equilibrium relative humidities of 10.0% to 75.4%. The moisture sorption characteristics of the sorghum product showed the characteristics S-shaped sorption isotherm curve that is typically obtained for agricultural products. The equilibrium data and the monomolccular layer moisture content values were estimated using the Brunauer-Emmett-Teller （BET） equation. The moisture content range for optimum storage of the dehydrated sorghum flour lies between 2.84% to 3.69% at 25℃ and 6.84% and 7.67% at 40℃. The information obtained from this study will help in the design and selection of storage and packaging systems for dehydrated sorghum flour.展开更多
文摘The rehydration of dehydrated products of boehmite with different textural morphology calcined at the temperature below 1000℃ is investigated by XRD and SEM.It is found that every dehydrated alumina is capable of being rehydratied and the rehydration product is boehmite. Rehydrates with different textural morphology have been produced from aluminas with different textural morphology, and the textural morphology of a rehydrate depends both on the starting alumina and on the hydrothermal conditions.The rehydration ability of aluminas is determined by their textural morphology and calcined temperature. Aluminas are directly rehydrated to rehydrate and the rehydration process is not the reverse. Process of the dehydration of the initial boehmite.
文摘Dehydrated sorghum flour （＂ogi＂） is useful as additional ingredient in certain food and pharmaceutical formulation, this could be obtained by soaking sorghum in water for 3 to 4 days, wet milling the soaked material, and fermentation for another 3 to 4 days. Typically, the fermented product is boiled into a pap or cooked into a stiff porridge. However, the fermented product can not be easily handled or stored and does not have a long shelf life （typically less than a week）. Dehydrating the fermented product into flour is one of the ways that is being employed to overcome these problems. Equilibrium moisture content （EMC） of dehydrated sorghum flour （aka ＂ogi＂） was therefore determined at two temperatures of 25℃ and 40℃ and four salt solutions. Zinc chloride （ZnCl2）, potassium acetate （KC2H3O2）, calcium chloride （CaCl2） and sodium chloride （NaCl） salts were prepared to correspond to equilibrium relative humidities of 10.0% to 75.4%. The moisture sorption characteristics of the sorghum product showed the characteristics S-shaped sorption isotherm curve that is typically obtained for agricultural products. The equilibrium data and the monomolccular layer moisture content values were estimated using the Brunauer-Emmett-Teller （BET） equation. The moisture content range for optimum storage of the dehydrated sorghum flour lies between 2.84% to 3.69% at 25℃ and 6.84% and 7.67% at 40℃. The information obtained from this study will help in the design and selection of storage and packaging systems for dehydrated sorghum flour.
