Process for the preparation of liquid 2-hydroxy-...

Details Process for the preparation of liquid 2-hydroxy-... Process for the preparation of liquid 2-hydroxy-...

Category

C - Chemistry, Metallurgy

Subcategory

07

Subsubcategory

C

CPC

260/526.5

IPC codes

C07C 323/52 (2006.01)

Type

Patent

Patent number

CA 1269995

Description

PROCESS FOR THE PREPARATION OF LIQUID 2-HYDROXY-METHYLTHIOBUTYRIC ACID Abstract of the Disclosure A process for the preparation of 2-hydroxy-4- methylthiobutyric acid is disclosed. 2-Hydroxy-4- methylthiobutyronitrile is hydrolyzed with mineral acid to produce an aqueous hydrolyzate containing 2-hydroxy- 4-methylthiobutyric acid and substantially free of unreacted 2-hydroxy-4-methylthiobutyronitrile and 2- hydroxy-4-methylthiobutyramide. 2-Hydroxy-4- methylthiobutyric acid is recovered from the hydrolyzate by extraction. Extraction may be carried out without prior separation from the hydrolyzate solution of any substantial fraction of solids present therein, and 2- hydroxy-4-methylthiobutyric acid may be recovered from the extract by steam distillation. The extraction solvent has a boiling point of between about 60°C and about 200°C, and the distribution coefficients for 2- hydroxy-4-methylthiobutyric acid between extract and raffinate, and between extract specimen and wash water, favor transfer to and retention of the acid product in the organic phase.

Application Number

467698

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