Study On Preparation Method Of Inositol From Maceration Water Of Corn

Inositol is a kind of saturation ring polyols, and its molecular formula is C6H12O6. It exists in all kinds of natural tissue of animal, plant and microorganism. Inositol is one of B-group vitamin, which is used extensively in medicine, food, forage industry and high-grade cosmetics. The main materials of inositol production in China are the by-products produced in the processing of farm products, such as maceration water of corn and rice bran. Accompanying with the improving of living standard, the demand for inositol is increasing continuously and the market price has trended stable. In the national markets, the global demands for inositol are about 6000 ton per year, while the domestic producing capacity is only about 2500 ton per year. China is the main exporter of inositol, about 90% of inositol produced in domestic is exported, but the productive technology is backward, and the productivity is low. Moreover, the research and development of deep processing for inositol are not enough, new productive technology which has high productivity and low cost needs to been developed. Now, in order to improve economic benefit, how to reduce the productive cost and improve technology level and market competitiveness has been a critical task. On the basis of investigation and research for productive technology of inositol, the technological process of inositol from maceration water of corn is studied in detail in this paper. At the meantime, technical parameters were optimized. The technological process of inositol production is as follows: adsorption of phytic acid through ion exchange resin, desorption of phytic base to form sodium phytate, concentration of sodium phytate, hydrolysis of concentrated liquid, crystallization and filter to remove disodium hydrogen phosphate, refinement of hydrolyzate, concentration of hydrolyzate, drying, crystallization, and the product inositol is obtained. This new method has lots of advantages, such as wider raw materials, lower cost, higher pure of the product. The main and the innovations in this dissertation are as following: (1) In the process of adsorption of phytic acid through ion exchange resin, choose a suitable ion exchange resin is vital for the adsorption. Through experiments the effects of adsorption quantity to the total adsorptive capacity of different ion exchange resins and the diameters of ion exchange resins are determined. Based on the experimental data, suitable anion exchange resins are chosen to adsorb phytic acid. For the adsorptive experiments of phytic acid, the main factors affecting the results are the adsorption space velocity of raw material liquid, the desorptive space velocity of desorbent, the temperature of desorption and the concentration of desorbent. Through orthogonal experiments, the optimum technical conditions are determined as follows. The adsorption space velocity of raw material liquid is 3h-1, the desorption space velocity of desorbent is 2h-1, the temperature of desorption is 35℃, and the concentration of desorbent is 6.5%. With the optimal conditions, the recovery rate of sodium phytate reaches over 98.59%. Before the process of desorption, the temperature of preheating washing water is 40℃～50℃, and after desorption the Ph value of sodium phytate should be adjusted to 7~8 by using ion exchange resin. In the process of concentration of desorbent, vacuum distillation is used to keep the vacuity above 0.08Mpa. The changing curves of space velocity of adsorption to time, lost quantity of resin to the pressure and lost quantity of resin to space velocity of liquid are measured, all these data can be used to guide practical production. (2) In the process of hydrolysis of sodium phytate, orthogonal experiments are used again to determine the optimal technological conditions: the reaction time is 10h, the reaction pressure is 10atm, and the concentration of desorbent is 20%. Though the repeating experiments, the recovery rate of inositol is obtained for above 80%. The operation method for purifying disodium hydrogen phosphate is determined. (3) New calculating method for the recovery rate of inositol is presented, which can reflect accurately the recovery rate of inositol. The method is: 100%the inositol quality in theorythe recovery rate of inositol= the inositol quality actually ×(4) Meanwhile the product inositol produced from maceration water of corn with ion exchange resin method is analyzed through infrared spectrum, and the error-trial dioptric high-performance liquid chromatography is adopted to analyze the product. Through the...