Process for the co-production of long chain amino acids and dibasic acids
There is disclosed a process for the co-production of long chain ω-amino acid and long chain dibasic acid, comprising: (1) reacting long chain ketoacid derivative with hydroxylamine or subjecting ketoacid derivative to an ammoximation to yield oxime derivative; (2) subjecting oxime derivative to Beckmann rearrangement to yield a mixture of mixed amide derivatives; (3) hydrolyzing the mixed amide derivatives to produce long chain ω-amino acid and long chain dibasic acid.
1. A process for the co-production of long chain ω-amino acid of formula (V) and long chain dibasic acid of formula (IV), comprising:
(1) reacting the ketoacid derivative (I) of the formula:
in a solvent with hydroxylamine or subjecting the ketoacid derivative (I) in a solvent to ammoximation to produce oxime acid derivative (II) of the formula:
wherein X is OR or NR 1 R 2 , wherein OR is C 1 -C 8 monohydric alcohol or polyhydric alcohol, R 1 and R 2 are each independently hydrogen or C 1 -C 8 alkyl group, m is an integral from 0 to 10, n is an integral from 6 to 20;
(2) subjecting the oxime derivative (II) in a solvent to Beckmann rearrangement to yield a mixture of amide derivatives (IIIa) and (IIIb)
and
(3) hydrolyzing the mixed amide derivatives to long chain ω-amino acid (V) and long chain dibasic acid (IV)
2. The process according to claim 1 , wherein the temperature for oximation is maintained from 0° C. to 100° C., and the pH is in a range of 3 to 14.
3. The process according to claim 1 , wherein catalyst for the Beckmann rearrangement of step (2) is sulfuric acid, an activated chlorine-containing compound, or a mixture of a Lewis acid and an activated chlorine-containing compound.
4. The process according to claim 1 , wherein the solvent for oximation, ammoximation, and Beckmann rearrangement is the same or a different solvent.
5. The process according to claim 1 , wherein the mixed amide derivatives are hydrolyzed by an acid or a mixture of acids to produce long chain ω-amino acid (V) and long chain dibasic acid (IV).
6. The process according to claim 1 , wherein the mixed amide derivatives are hydrolyzed by a base or a mixture of bases to produce long chain ω-amino acid (V) and long chain dibasic acid (IV).
7. The process according to claim 1 , wherein long chain ω-amino acid (V) and long chain dibasic acid (IV) are separated from their mixture by a stepwise neutralization.
8. The process according to claim 1 , wherein long chain ω-amino acids of the formula (V) are 9-aminononanoic acid, 11-aminoundecanoic acid, and 13-aminotridecanoic acid.
9. The process according to claim 1 , wherein long chain dibasic acids of the formula (IV) are sebacic acid, dodecanedioic acid, and brassylic acid.
10. The process according to claim 1 , wherein polyhydric alcohol is selected from ethylene glycol, propylene glycol, butanediol, or glycerol.