A method for separating and purifying ammonium sulfate from the by-product solution of the flue gas desulfurizer regeneration process
A regeneration process, separation and purification technology, applied in separation methods, chemical instruments and methods, ammonium sulfate, etc., can solve the problems of high precision control system requirements, difficult crystallization and sweating rates, and poor reproducibility. High purification efficiency, reducing water pollution and high comprehensive utilization of resources
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Embodiment 1
[0038] 1) Fill the gel-type cation exchange resin Seplite LSI-010 in the exchange column by a wet method, first wash the resin with deionized water at a flow rate of 6BV / h until the pH of the effluent is 7-9, and then use a volume of 4BV, The ammonium bicarbonate solution with a molar concentration of 1mol / L rinses the resin at a flow rate of 1.5BV / h, and finally washes the resin with deionized water at a flow rate of 6BV / h until the pH of the effluent is 7-9 to obtain NH 4 + type cation exchange resin.
[0039] 2) NH 4 + Type cation exchange resin is filled in the cation exchange column by wet method. + NH bound to the resin 4 + An exchange reaction occurs, and the effluent of ammonium sulfate and ammonium bicarbonate at the bottom of the column is collected, and the Na in the effluent + When the concentration reaches 5mg / L as the end point, the collection is stopped. The ion exchange capacity Q of Seplite LSI-010 resin is determined to be 20.1mg / g. After drying at 55°...
Embodiment 2
[0040] Embodiment 2: scale-up experiment
[0041] 1) Fill the macroporous cation exchange resin Amberlite FPC22Na in the exchange column by wet method, first wash the resin with deionized water at a flow rate of 8BV / h until the pH of the effluent is 7-9, and then use a volume of 5BV and a molar concentration Wash the resin with 1.5mol / L ammonium bicarbonate solution at a flow rate of 1.5BV / h, and finally wash the resin with deionized water at a flow rate of 8BV / h until the pH of the effluent is 7-9 to obtain NH 4 + type cation exchange resin.
[0042] 2) Fill each of the two exchange columns with 120mL of wet resin (i.e. NH 4 + type cation exchange resin), and then two exchange columns are connected in series, and the regeneration by-product mixed solution is passed through the resin bed at a flow rate of 2BV / h, when the Na in the second exchange column effluent liquid + When the concentration reaches 5mg / L, stop the operation, regenerate the resins in the two columns, and...
Embodiment 3
[0044] 1) Fill the macroporous cation exchange resin Amberlite FPC 22Na in the exchange column by wet method, first use deionized water to wash the resin at a flow rate of 6BV / h until the pH of the effluent is 7-9, and then use a volume of 3BV, The ammonium sulfate solution with a molar concentration of 2mol / L rinses the resin at a flow rate of 1.5BV / h, and finally washes the resin with deionized water at a flow rate of 6BV / h until the pH of the effluent is 7-9 to obtain NH 4 + type cation exchange resin.
[0045] 2) NH 4 + Type cation exchange resin is filled in the cation exchange column by wet method. At room temperature, the mixed solution of regeneration by-products in the flue gas desulfurization agent regeneration process is passed through the resin bed at a flow rate of 8BV / h, and Na + NH bound to the resin 4 + The exchange reaction occurs, and the effluent at the bottom of the column is collected to use the Na in the effluent + When the concentration reached 5mg...
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