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US 10,501,399 B2Granted
Lactic acid manufacturing method
AssigneeToray Industries, Inc.
InventorsKenji Kawamura, Miyuki Horiguchi, Satoshi Sakami, Katsushige Yamada
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Abstract
A method of producing lactic acid includes subjecting a lactic acid-containing solution to distillation to collect lactic acid from the vapor side (Step A); subjecting the lactic acid obtained in Step A to crystallization (Step B); subjecting the lactic acid slurry obtained in Step B to solid-liquid separation into lactic acid crystals and a mother liquor (Step C); and circulating the mother liquor obtained in Step C to Step B (Step D).
Claims21
A method of producing lactic acid comprising:
- subjecting a lactic-acid containing solution to distillation to collect lactic acid from the vapor side (Step A);
- subjecting the lactic acid obtained in Step A to crystallization (Step B);
- subjecting a lactic acid slurry obtained in (Step B) to solid-liquid separation into lactic acid crystals and a mother liquor containing a lactic acid oligomer (Step C);
- and
- circulating the mother liquor obtained in Step C to Step B (Step D),
- wherein a mixture of the mother liquor circulated in Step D and the lactic acid obtained in Step A is subjected to crystallization to obtain lactic acid crystals.
3 more elements
A method of producing lactic acid comprising:
- subjecting a lactic acid-containing solution to distillation to collect lactic acid from the vapor side (Step A);
- partially condensing vapor from the vapor side to produce liquid lactic acid and water, and condensing a remaining portion of the vapor to produce water and low boiling point components (Step A1);
- subjecting the lactic acid obtained in (Step A1) to crystallization (Step B);
- subjecting lactic acid slurry obtained in (Step B) to solid-liquid separation into lactic acid crystals and a mother liquor containing a lactic acid oligomer (Step C);
- and
- circulating the mother liquor obtained in (Step C) to (Step B) (Step D),
- wherein a mixture of the mother liquor circulated in Step D and the lactic acid obtained in Step A is subjected to crystallization to obtain lactic acid crystals.
4 more elements
A method of producing lactic acid comprising:
- subjecting a solution containing water and lactic acid to distillation to collect lactic acid from the vapor side (Step A), wherein the distillation comprises recovering vaporized lactic acid and a portion of the water in a first-stage condenser and recovering remaining water and low boiling components in a second-stage condenser;
- subjecting the lactic acid obtained in Step A to crystallization (Step B);
- subjecting the lactic acid slurry obtained in Step B to solid-liquid separation into lactic acid crystals and a mother liquor (Step C);
- and
- circulating the mother liquor obtained in Step C to Step B (Step D),
- wherein a mixture of the mother liquor circulated in Step D and the lactic acid obtained in Step A is subjected to crystallization to obtain lactic acid crystals.
3 more elements
Dependencies are inferred from the claim text.