Purification of cadaverine using high boiling point solvent
One aspect of the invention relates to a method for the purification of cadaverine from an aqueous cadaverine composition comprising one or more involatile impurities, the method comprising: a) distilling or evaporating the aqueous cadaverine composition wherein one or more solvents are added to the evaporation/distillation system before the evaporation/distillation starts, during the evaporation/distillation and/or after the evaporation/distillation substantially stops when no more evaporation/distillation is observed to produce purified cadaverine, wherein the evaporation or distillation is done at a heating temperature of about 80° C. to about 180° C. and under a pressure of 1 atm or lower, and the one or more solvents comprise at least one or more high boiling point (HBP) solvents having a boiling point of at least about 185° C. (1 atm); and b) recovering the one or more HBP solvents.
1. A method for the purification of cadaverine from an aqueous cadaverine composition comprising one or more involatile impurities, the method comprising:
a) distilling or evaporating the aqueous cadaverine composition wherein one or more solvents are added to the evaporation/distillation system before the evaporation/distillation starts, during the evaporation/distillation and/or after the evaporation/distillation substantially stops when no more evaporation/distillation is observed to produce purified cadaverine, wherein the evaporation or distillation is done at a heating temperature of about 80° C. to about 180° C. and under a pressure of 1 atm or lower, and the one or more solvents comprise at least one or more high boiling point (HBP) solvents having a boiling point of at least about 185° C. (1 atm); and
b) recovering the one or more HBP solvents.
2. The method of claim 1 , wherein the one or more HPB solvents are recovered at a recovery yield of about 50% to about 99%.
3. The method of claim 1 , wherein the recovered one or more HBP solvents have a purity of about 90% to about 99%.
4. The method of claim 1 , wherein step b) comprises phase separation after adding water, and/or distillation.
5. The method of claim 4 , wherein the distillation in step b) is carried out at a reduced pressure or ambient pressure.
6. The method of claim 5 , wherein the reduced pressure is about −0.15 MPa to about 0 MPa.
7. The method of claim 4 , wherein the amount of water added is about 0.5 to about 10 times by weight of the amount of the residue obtained after the distillation or evaporation in step a).
8. The method of claim 7 , wherein the amount of water added is about 1 to about 3 times by weight of the amount of the residue obtained after the distillation or evaporation in step a).
9. The method of claim 1 , wherein the one or more HBP solvents are selected from the group consisting of alkanes, chloroalkanes, benzene derivatives, alcohols, ethers, amines, esters, nitriles, and any combinations thereof.
10. The method of claim 9 , wherein the one or more HBP solvents are selected from the group consisting of C 14 alkanes, an alkane mixture of C 11 , C 12 , C 13 and/or C 14 alkanes, biphenyl ether, and dodecanol.