Patent ID: 8399705
Filing Date: 2013-03-19
Classification: C07C,C09K,C11D,D21C

Abstract:
1. A process to prepare an alkalimetal salt of glutamic acid-N,N-diacetic acid (GLDA) of the formula Na x K y H z GLDA, wherein x is equal to or more than 2 and lower than 4 and y is more than 0 and equal to or lower than 2, x+y is 3.5-4, and x+y+z=4, comprising reacting glutamic acid, a sodium or potassium salt thereof or a mixture thereof with formaldehyde, hydrogen cyanide, a potassium or sodium salt thereof or a mixture thereof and potassium hydroxide, sodium hydroxide or a mixture thereof, in an aqueous solution at an elevated temperature to remove formed NH 3 , wherein during the process the molar ratio of sodium to potassium in the reactants is between 1:1 and 7:1.