ALTERING THE CRYSTAL SIZE DISTRIBUTION OF N-(PHOSPHONOMETHYL) IMINODIACETIC ACID FOR IMPROVED FILTRATION AND PRODUCT QUALITY

摘要

Improved processes for preparing and crystallizing N- (phosphonomethyl)iminodiacetic acid are provided. The processes include addi ng N-(phosphonomethyl)iminodiacetic acid seed crystals to N- (phosphonomethyl)iminodiacetic acid reaction solutions. Provided are beds of crystallized N-(phosphonomethyl)iminodiacetic acid having improved permeability and filtration rate and reduced impurities.