초록 ▼

A process for producing potassium phosphates by ion exchange using an Advanced Separation Device (ASD) is disclosed. The process is carried out by supplying a phosphate salt solution, a washing solution and a potassium salt regeneration solution to respective fixed feed ports in periodic fluid commu

A process for producing potassium phosphates by ion exchange using an Advanced Separation Device (ASD) is disclosed. The process is carried out by supplying a phosphate salt solution, a washing solution and a potassium salt regeneration solution to respective fixed feed ports in periodic fluid communication with a plurality of resin-filled chambers moving about a circular path. Passage of the phosphate salt solution through potassium loaded resin forms potassium phosphates and cation loaded resin by ion exchange. After washing out residual salts, the cation loaded resin is regenerated by adding a potassium salt which loads the resin with potassium and strips it of the cation in the form of a soluble cation salt. By virtue of the ASD, potassium phosphate may be produced continuously and with greater efficiency than is possible with conventional ion exchange processes since the potassium salt and phosphate salt feed solutions may be fortified in an intra-stage fashion, i.e. during the course of the ion exchange or regeneration stages. In similar fashion, the pH may be adjusted in an intra-stage fashion.

대표청구항 ▼

A process for producing potassium phosphate comprising the steps of: (A) providing an Advanced Separation Device having (i) a regeneration fluid feed port and at least two ion exchange fluid feed ports as well as corresponding regeneration fluid and ion exchange fluid discharge ports; (ii) a plurali

A process for producing potassium phosphate comprising the steps of: (A) providing an Advanced Separation Device having (i) a regeneration fluid feed port and at least two ion exchange fluid feed ports as well as corresponding regeneration fluid and ion exchange fluid discharge ports; (ii) a plurality of resin-filled chambers disposed between and moving about a circular path in periodic fluid communication with said feed and discharge ports; (B) supplying a metal phosphate salt ion exchange fluid to at least one of said at least two exchange fluid feed ports for delivery into chambers containing resin loaded with potassium, the metal of the phosphate salt having a greater affinity for said resin than the potassium and thereby being exchanged with the potassium to form a resin loaded with said metal and an interaction product including potassium phosphate and unexchanged ion exchange fluid which is discharged through at least one of said at least two ion exchange fluid discharge ports; (c) fortifying the interaction product with additional metal phosphate salt and supplying the fortified Iinteraction product into at least one ion exchange feed port subsequent to the ion exchange feed ports supplied in step (B) to form a second interaction product including potassium phosphate and unexchanged ion exchange fluid, the second interaction then being discharged from the Advanced Separation Device; (D) supplying a regeneration fluid containing a salt of potassium and an anion to said regeneration fluid feed port for delivery into chambers containing resin loaded with the metal of said phosphate salt, the potassium of said regeneration fluid having a greater affinity for said resin and thereby being exchanged with said metal to form resin loaded with potassium and a second interaction product comprising a water-soluble salt of said metal and said anion and unexchanged regeneration fluid which is discharged through said regeneration fluid discharge port.