Method for producing high-purity caprolactam
AssigneeMitsubishi Kasei Corporation
InventorsKazuo Tan, Takashi Hironaka, Michio Nakamura
Life of this patent
Estimating the term…
Abstract
A method for producing high-purity caprolactam from a mixture comprising a melt of crude caprolactam and water, which comprises cooling the mixture in a crystallizer under a reduced pressure of from 1 to 22 Torr while maintaining the water concentration in the mixture at a level of from 0.5 to 10% by weight, to crystallize high-purity caprolactam, and then separating the resulting crystals.
Claims4
A method for producing high-purity caprolactam from a mixture comprising a melt of crude caprolactam and water, which comprises cooling the mixture in a crystallizer under a reduced pressure of from 1 to 22 Torr while maintaining the water concentration in the mixture at a level of from 0.5 to 10% by weight, to crystallize high-purity caprolactam, and then separating the resulting crystals.
Dependencies are inferred from the claim text.