Study On Extraction Of Inositol From Paddy Hull And Mensuration On Thermodynamic Dada

Inositol is a fine chemical industry raw material, and has higher value-add. It has been widely applied to the industry of pharmaceutical, food, feed, as well as daily chemical matters, and so on.A new preparation technique of inositol was investigated from paddy hull in this paper. Putting high boiling polyhydric alcohol and certain quantity of solid super acid catalyst into an aqueous solution of phytic acid, in which the phytic acid was hydrolyzed at atmospheric pressure. Inositol was obtained after filtering, crystaling, drying hydroiyzing resultants. Due to the particularity of the catalyst, it was possibility that higher quality of inositol can be carried out with success during one-time crystallization. Because of the characteristic of catalyst, this process of hydroiyzing phytic acid was simplified during the technique of inositol, such as removing from impurities, decoloring, concentrating, and so on.The different SO₄^2-/TiO₂ solid super acids of which applied as the catalysts of hydroiyzing phytic acid were prepared. The reacting conditions were optimized by means of the Orthogonal Test Method (L16-4-4). The experimental results showed that there were different effects of different factors on the phytic acid hydroiyzing reaction. The sequence of effect on the reaction result was given by the type of catalyst > proportion of glycerin > reaction time > usage of catalyst. The better technical conditions were acquired in which were the Ti22 type of catalyst, 3.5 the proportion of glycerin to phytic acid, the reaction time of 21h, and the dosage of catalyst was 0.25% of the quality of phytic acid, respectively. The effects of different preparation method of SO₄^2-/ TiO₂ solid super acids on the phytic acid hydroiyzing reaction were investigated, and the best preparation conditions were made sure in which the concentration of the spirit of sulphur was 1.00 mol/L, the temperature of dryness was 100℃, the temperature of calcinations was 500℃, the time of calcinations was 2h, respectively. The surface acid strength, specific surface area and thermal analysis were studied on SO₄^2-/TiO₂ solid super acid.On the basic of the results extracted phytin from paddy hull at our laboratory previously, phytic acid was extracted from phytin by dissolving method. According to given the better technical conditions of industry phytic acid hydrolyzating reaction in this paper, the phytic acid extracted from paddy hull was hydrolyzed, and the conversion rate was 62.98%. It was lower than the hydrolyzating conversion 72.35% of which came from the industry phytic acid.The thermodynamics of inositol were determined by XRY-1C calorimeter, DSC and DTG-TGA, respectively. The combustion enthalpy and the formation enthalpy of inositol is -2805.1 kJ·mol^-1 and -1270.94 kJ·mol^-1 at the standard state. The melting range, the melting heat, and decomposition temperature is 225.37～231.92℃, 256.67 J·g^-1, 300℃for inositol, respectively. The necessary basic data of inositol are provided for the exploiting new synthesis method, engineering design and industrialized production.