Glutamic acid N,N-diacetic amide, glutamic acid N-acetic amide N-acetonitrile, alkali metal salts thereof, process to prepare them and their use
View Patent ↗The present invention relates to glutamic acid N,N-diacetic amide, potassium or sodium glutamate N,N-diacetic amide, glutamic acid N-acetic amide N-acetonitrile, potassium or sodium glutamate N-acetic amide N-acetonitrile, to processes to prepare such compounds and the use thereof.
1. A solid compound of glutamic acid N,N-diacetic amide, potassium or sodium glutamate N,N-diacetic amide, glutamic acid N-acetic amide N-acetonitrile, or potassium or sodium glutamate N-acetic amide N-acetonitrile, wherein the solid compound is in isolatable form.
2. A process to prepare the acetic amide compound of claim 1 , comprising the hydrolysis of glutamic acid N,N-diacetonitrile, or the potassium or sodium salt thereof, at a pH between 0.5 and 7.
3. The process of claim 2 further comprising in a subsequent step isolating the glutamic acid-N,N-diacetic amide, glutamic acid N-monoacetic amide N-monoacetonitrile or the potassium or sodium salt thereof by a crystallization or precipitation step.
4. A process to prepare the acetic amide compound of claim 1 , 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, and in a subsequent step hydrolyzing the nitrile compound formed in the first step at a pH between 0.5 and 7.
5. The process of claim 2 further comprising performing a subsequent hydrolysis at a temperature of at least 90.degree. C. and an alkaline pH to give glutamic acid-N,N-diacetic acid or the sodium or potassium salt thereof.
6. The process of claim 4 further comprising performing a subsequent hydrolysis at a temperature of at least 90.degree. C. and an alkaline pH to give glutamic acid-N,N-diacetic acid or the sodium or potassium salt thereof.
7. A process to prepare glutamic acid N,N-diacetic acid or salts thereof comprising the step of hydrolyzing the acetic amide compound of claim 1 .
8. A crystallization inhibitor comprising the solid compound of claim 1 .
9. An oil well composition comprising the solid compound of claim 1 .
10. A detergent composition comprising the solid compound of claim 1 .
11. A descaling composition comprising the solid compound of claim 1 .
12. A microbial composition comprising the solid compound of claim 1 .
13. A micronutrient composition comprising the solid compound of claim 1 .
14. A gas sweetening composition comprising the solid compound of claim 1 .
15. A pulp and paper bleaching composition comprising the solid compound of claim 1 .
16. A aqueous solution comprising glutamic acid N,N-diacetic amide, potassium or sodium glutamate N,N-diacetic amide, glutamic acid N-acetic amide N-acetonitrile, potassium or sodium glutamate N-acetic amide N-acetonitrile, wherein the solution has a pH between 0.5 and 7.