초록 ▼

Acrylic acid is separated from its solutions in tri-n-butyl phosphate by establishing from such a solution a vapor phase comprising substantially all of the acrylic acid and a portion of the solvent, at a temperature below the degradation point of the acrylic acid; next partially or totally condensi

Acrylic acid is separated from its solutions in tri-n-butyl phosphate by establishing from such a solution a vapor phase comprising substantially all of the acrylic acid and a portion of the solvent, at a temperature below the degradation point of the acrylic acid; next partially or totally condensing said vapor phase; and then distilling the acrylic acid from such condensation product, while maintaining an amount of acrylic acid at the base of the distillation column, and conducting the distillation under conditions such that neither solvent degradation nor acrylic acid crystallization results.

대표청구항 ▼

A process for the separation and recovery of essentially pure acrylic acid and essentially pure tri-N-butyl phosphate from a solvent solution thereof, which comprises (i) vaporizing a feed stream of acrylic acid/tri-N-butyl phosphate solvent solution at a temperature not in excess of 160°C., such as

A process for the separation and recovery of essentially pure acrylic acid and essentially pure tri-N-butyl phosphate from a solvent solution thereof, which comprises (i) vaporizing a feed stream of acrylic acid/tri-N-butyl phosphate solvent solution at a temperature not in excess of 160°C., such as to avoid degradation of the tri-N-butyl phosphate, and, whereby there is thus established (ii) a vapor phase comprising virtually all of the acrylic acid and a fraction of the tri-N-butyl phosphate solvent and (iii) a liquid phase consisting essentially of said tri-N-butyl phosphate solvent; (iv) recovering said liquid phase (iii); (v) at least partially condensing said vapor phase (ii); and thence (vi) distilling the condensate (v) at a temperature not in excess of 160°C. and under such reduced pressure as to avoid acrylic acid crystallization, to obtain a distillate (vii) comprising essentially pure acrylic acid and an acrylic acid/tri-N-butyl phosphate distilland (viii), while maintaining the amount of acrylic acid in said distilland (viii) to between 1 and 20%.