Chemoreaction drying technology: principle, application and roles

Sustainable Agriculture Transformation for The Nations Welfare of Indonesia and Malaysia

Soekarto, S.T.^1 ; Zakaria, F.R.^1

Department of Food Science and Technology, Faculty of Agricultural Engineering, Bogor Agricultural Institute, Indonesia^1

关键词: Cell viability;    Drying process;    Drying technology;    Drying temperature;    Electrical energy;    Heat production;    High-quality products;    Yeast culture;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/196/1/012003/pdf
DOI  :  10.1088/1755-1315/196/1/012003

来源: IOP

【 摘 要 】

The potential of chemoreaction drying technology application in Indonesia is upright due to the abundant availability of natural lime. Traditionally, the lime is burnt and CaO, traditionally called burnt lime or fire lime is produced. Burnt lime is used as raw materials for construction and chemical industry. Adding water to CaO changes the burnt lime to become Ca (OH)2, which has higher price than the burnt lime, and produces heat that can be used as chemoreaction reactant for drying process. The special drying natures of CaO will be synergized during the chemoreaction drying process in the closed containers containing the burnt lime reactant and materials to be dried. The drying process in chemoreaction become special because the drying is held at slightly above room temperature, which is about 35°C. The resulting dry product can reach the water level 2 - 4 %; hence the product will be durable with very high quality. The weakness in the conduction of the chemoreaction drying process can be resolved by the use of burnt lime doubled in quantity and the drying process is compensated with longer time without depending on availability of electrical energy. Chemoreaction drying involves the process of evaporation of water in the material to be dried and heat production by the burnt lime used. The advantages of chemoreaction drying technology can be applied to produce many types of dried high quality products, without losing the expensive essential oil. Chemoreaction drying has been used to drying up seeds (corn, soybean, peanut, red chili) to produce quality seeds with very high growing power. Chemoreaction drying was also used to dry brem, a traditional fermented cake, that become highly hygroscopic sheets with 10 - 15 % water content with very good quality. The drying experiment was also be done on yeast (Saccharomyces serevisiae) suspension to obtain dried form for storage culture. with cell viability of 109/ml and in form of fine flour yeast culture. The experiments on pepper at drying temperature 29-30°C produce dry pepper with 4 - 8% moisture. The most important role of the chemoreaction drying process is able to maintain the essential oil with the loss only 1.4 %. The quality of nutmeg by chemoreaction drying was much higher, than the sun dryed.