Research On Recycling Of Potassium And Removing Sodium From Mother Liquor B

Potassium and sodium in the mother liquor B and Ca²⁺ in the dilute juice is the mainly inorganic in the sugar beet sugar.This article present a new technology for juice and mother liquor B clarification, that K+ in mother liquor B adsorbed by sodium resin,then it eluted by sodium sulfate from the resin column obtain potassium, the resin generated at the same time .then use the calcium resin moving potassium and sodium from the mother liquor B, After that the resin will regenerated by dilute juice.The main contentsa as follows:1. In the static condition, the adsorption capacity,elution rate, adsorption isotherm parameters etc of K+ in mother liquor B is research. obtain the adsorption balance of K + at the BK001 resin the will fit Langmuir adsorption isotherm equations.research the influence of temperature, potassium concentration, and particle size of resin on K+ get the speed-conrolling step, reaction order and apparent energy of activation of BK001, The results show that eaction order 1.389 and apparent energy of activation 35.1 kJ/mol. Then, the kinetics model of K+ in mother liquor B extraction process by BK001 was established:2. In the dynamic conditions, The process conditions of separation and elution of K+ on ion exchange column chromatography were studied. Single factor experiment and orthogonal experiments is carry out to research effect of resin penetration exchange capacity by temperature, concentration of K+, flow rate,resin height. The results show, the best process condition of adsorbing K+ using resin BK001 was that,temperature 60℃, molasses brix 50°Bx, flow rate 2BV/h, and the ratio of height to diameter of the resin column was 8:1. The process conditions affect the separation of potassium in the order: resin height﹥temperature﹥concentration of K+﹥flow rate. Under the optimum process conditions, 90mL of resin bed can absorb K+ 5.29g. The optimum condition of eluting K+ using Na2SO₄ eluant is that, the mass and volume of eluant was 10.6g and 5BV, temperature 80℃and the flow rate was 2 BV/h. Under these conditions the elution rate was 98.6 %.3. Single factor experiment was carry out to determine the factors effecting to the resin penetration exchange capacity. The results show,the optimal technique for the calcium ion-exchange BK001 resin to elute K⁺ and Na ⁺ from the mother liquor B is, mother liquor B temperature is 60℃, the degree brix is 50°Bx, velocity is 2 BV/h and resin for the high aspect ratio is 8:1.4. Compared the effect of potassium crystal by insulation crystallization, natural crystallization and quick frozen crystallization method.The results show, the quality of potassium sulfate by quick frozen crystallization is most but have particle size small;the purity of potassium sulfate by natural crystallization is the highest; the purity of potassium sulfate by insulation crystallization is the lowest.5. For ten cycle experiment, the resin useing recycling of potassium from mother liquor B and moving potassium and sodium from mother liquor B is researched. The results show,The BK001 resin in Na⁺ form is stabled at first 8 period ,then the resin is polluted and it efficiency reduced . the resin in Na⁺ form was saturated adsorpted by K⁺ when processing 5BV mother liquor B. The resin in Ca2⁺ form was tabled at first 8 period, then the resin efficiency reduced it can processing 5BV mother liquor B.The rate that eluting Na⁺ can reach to 35.26%, the rate that eluting K⁺ can reach to 48.59%.The resin used 8 period should regenerated by acid or alkali. Pilot experiment proved that the above conclusions.