Processes for producing caprolactam and derivatives thereof from fermentation broths containing diammonium adipate or monoammonium adipate
View Patent ↗Processes for producing caprolactam (CL) and derivatives thereof from adipic acid (AA) obtained from fermentation broths containing diammonium adipate (DAA) or monoammonium adipate (MAA).
1. A process for producing CL from a clarified DAA-containing fermentation broth or MAA-containing fermentation broth comprising:
(a) distilling the broth under greater than ambient pressure at a temperature of >100° C. to about 300° C. to form an overhead that comprises water and ammonia, and a liquid bottoms that comprises AA and at least about 20 wt % water;
(b) cooling and/or evaporating the bottoms to attain a temperature and composition sufficient to cause the bottoms to separate into a liquid portion and a solid portion that is substantially pure AA;
(c) separating the solid portion from the liquid portion; and
(d) contacting at least a part of the solid portion with hydrogen, optionally in the presence of a solvent, in the presence of a hydrogenation catalyst and an ammonia source, at a temperature of about 25° C. to about 500° C. and a pressure of about 0.5 to about 40 MPa to produce the CL.
2. A process for producing CL from a clarified DAA-containing fermentation broth or MAA-containing fermentation broth comprising:
(a) adding an ammonia separating solvent and/or a water azeotroping solvent to the broth;
(b) distilling the broth at a temperature and pressure sufficient to form an overhead that comprises water and ammonia, and a liquid bottoms that comprises AA and at least about 20 wt % water;
(c) cooling and/or evaporating the bottoms to attain a temperature and composition sufficient to cause the bottoms to separate into a liquid portion and a solid portion that is substantially pure AA;
(d) separating the solid portion from the liquid portion; and
(e) contacting at least a part of the solid portion with hydrogen, optionally in the presence of a solvent, in the presence of a hydrogenation catalyst and an ammonia source, at a temperature of about 25° C. to about 500° C. and a pressure of about 0.5 to about 40 MPa to produce the CL.
3. The process of claim 1 , wherein producing the CL comprises dehydrating at least part of the solid portion in the presence of an ammonia source to produce an amide of AA followed by hydrogenation of the amide to form CL.
4. The process of claim 1 , further comprising converting the CL to NYLON 6.
5. The process of claim 1 , wherein the fermentation broth is obtained by fermenting a carbon source in the presence of a microorganism selected from the group consisting of Candida tropicalis (Castellani) Berkhout, anamorph strain OH23 having ATCC accession number 24887; E. coli strain AB2834/pKD136/pKD8.243 A/pKD8.292 having ATCC accession number 69875; E. coli cosmid clone 5B12 comprising a vector expressing the cyclohexanone monoxygenase encoded by SEQ ID NO: 1, E. coli cosmid clone 5F5 comprising a vector expressing the cyclohexanone monoxygenase encoded by SEQ ID NO: 1; E. coli cosmid clone 8F6 comprising a vector expressing the cyclohexanone monoxygenase encoded by SEQ ID NO: 1; E. coli cosmid clone 14D7 comprising a vector expressing the cyclohexanone monoxygenase encoded by SEQ ID NO: 1; and Verdezyne Yeast.
6. The process of claim 2 , wherein distilling the broth is carried out in the presence of an ammonia separating solvent which is at least one selected from the group consisting of diglyme, triglyme, tetraglyme, sulfoxides, amides, sulfones, polyethyleneglycol (PEG), butoxytriglycol, N-methylpyrolidone (NMP), ethers, and methyl ethyl ketone (MEK) or in the presence of a water azeotroping solvent which is at least one selected from the group consisting of toluene, xylene, methylcyclohexane, methyl isobutyl ketone, hexane, cyclohexane and heptane.
7. The process of claim 2 , wherein producing the CL comprises dehydrating at least part of the solid portion in the presence of an ammonia source to produce an amide of AA followed by hydrogenation of the amide to form CL.
8. The process of claim 2 , further comprising converting the CL to NYLON 6.
9. The process of claim 3 , further comprising converting the CL to NYLON 6.
10. The process of claim 7 , further comprising converting the CL to NYLON 6.
11. The process of claim 2 , wherein the fermentation broth is obtained by fermenting a carbon source in the presence of a microorganism selected from the group consisting of Candida tropicalis (Castellani) Berkhout, anamorph strain OH23 having ATCC accession number 24887; E. coli strain AB2834/pKD136/pKD8.243 A/pKD8.292 having ATCC accession number 69875; E. coli cosmid clone 5B12 comprising a vector expressing the cyclohexanone monoxygenase encoded by SEQ ID NO: 1, E. coli cosmid clone 5F5 comprising a vector expressing the cyclohexanone monoxygenase encoded by SEQ ID NO 1; E. coli cosmid clone 8F6 comprising a vector expressing the cyclohexanone monoxygenase encoded by SEQ ID NO: 1; E. coli cosmid clone 14D7 comprising a vector expressing the cyclohexanone monoxygenase encoded by SEQ ID NO: 1; and Verdezyne Yeast.