Process and reagents for the inhibition or reduction of scale formation during phosphoric acid production

摘要

Processes and reagents for inhibiting or eliminating scale formation during wet-process phosphoric acid production are provided and include adding to a wet-process phosphoric acid production stream a scale inhibiting amount of a reagent having an aliphatic or aromatic compound containing at least two hydroxy groups, and at least one amine.

主权项

1. A process for inhibiting or eliminating scale during wet-process phosphoric acid production comprising:
adding to a wet-process phosphoric acid production stream a scale inhibiting amount of a reagent comprising
i) from about 10 to about 1000 grams per ton of P2O5 by weight of an aromatic compound according to Formula (I) wherein
each of X and Y is independently selected from the group consisting of H, OH, NH2, halides, SH, CN, CHO, COOH, and PO3H; andR is chosen from H or selected from the group consisting of C1-C10 alkyl, C6-C20 aryl, and C7-C20 aralkyl, wherein said group is optionally substituted with one or more substituents selected from the group consisting of OH, NH2, halogen, SH, CN, CHO, COOH, and PO3H; andwherein the compound contains at least two hydroxyl groups, and has a molecular weight of 3,000 Da or less; andii) from about 10 to about 1000 grams per ton of P2O5 by weight of at least one amine,thereby inhibiting or eliminating scale in said phosphoric acid production process.