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Separation Of Biological Succinic Acid

Posted on:2016-12-28Degree:MasterType:Thesis
Country:ChinaCandidate:Z X ZhanFull Text:PDF
GTID:2271330482971855Subject:Chemical Engineering
Abstract/Summary:PDF Full Text Request
Succinic acid is an important four carbon compound industrially. As the organic synthesis raw materials, intermediate products or chemicals, succinic acid is widely used in many fields of medicine, food additives, solvents and green biodegradable plastics. In this work, the extraction process of succinic acid were explored. Using crystallization, cation exchange resin and solvent extraction separation, succinic acid is separated from sodium succinate solution, these would provide theoretical guidance for industrial production of succinic acid. The thesis includes three parts.(1) Crystallization of sodium succinate solution. The effects of initial concentration, crystallization temperature, crystallization time on the crystallization process were investigated. Experimental results show that, the higher the initial concentration, the higher the yield of crystallization. When the initial concentration was 24%, the crystallization temperature was 0 ℃, the crystallization time was 60min, the yield was 44.7%.(2) Exchange and adsorption of sodium ion from sodium succinate solution by cation exchange resin. Three different cationic resin were screened, and saturated adsorption capacity of the cation exchange resin JK006 was highest, reaching 57mg/g, adsorption equilibrium time was 90s. The adsorption of sodium ion was studied by dynamic method. When the initial concentrations were 50mg/ml and 100mg/ml. the breakthrough volume of JK006 were 56ml and 40ml. the adsorption isotherms of sodium ions on the resin JK006 were fitted, and the highest degree of fitting was Langmuir isotherm equation, this indicated that the adsorption of sodium ions on the resin JK006 belongs monolayer adsorption. The kinetic equations were used to fit the data of adsorption of sodium ion on JK006, where Ho and McKay (proposed second-order equation) model had the highest degree of linear correlation, this indicated that the adsorption process of sodium ions was affected by liquid film diffusion and internal diffusion. At the same time, the batch and continuous adsorption mathematical model were established, and the data of simulation coincided with experimental values.these indicated that the mathematical model established in this work, can accurately described the batch and continuous ion exchange and adsorption process of sodium ion from sodium succinate solution by cation exchange resin.(3) Recovery of succinic acid from aqueous solution by extraction. A variety of extraction agents were screened, cyclohexanone is used for extraction of succinic acid, of which the single-stage extraction rate was 57.5%,5min was selected as the extraction time, the ratio is 2. and the temperature is room temperature. After three cross-flow extraction, the initial concentration of succinic acid is 10%. the extraction rate was up to 99.25%. and the concentration of succinic acid in raffmate phase was less than 0.1%.
Keywords/Search Tags:succinic acid, crystallization, ion exchange, solvent extraction
PDF Full Text Request
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