Method for obtaining 2-hydroxy-4-methylthiobutyric acid (MHA) which is stable in storage
First Claim
Patent Images
1. A method for obtaining 2-hydroxy-4-methylthiobutyric acid (MHA) which is stable in storage, comprising:
- distilling a highly-concentrated liquid MHA containing >
95% by weight monomeric and oligomeric components of MHA for an average residence time of the MHA between 1 and 1×
104 s, under reduced pressure of between 1×
10-3 and 5×
104 Pa, at a temperature in a range between 40° and
200°
C., at which the monomeric MHA is converted into a gaseous state for a time period which is sufficiently short that formation of significant by-product components is avoided.
6 Assignments
0 Petitions
Accused Products
Abstract
A method for obtaining 2-hydroxy-4-methylthiobutyric acid (methionine-hydroxy analog, MHA) in primarily free form which is stable in storage by distilling a product solution containing MHA and by producing MHA product mixtures with improved storage stability from such a distillate. The distillate can be produced directly starting from MHA raw products from any MHA production process, which can optionally also contain solvent or water. The starting material may also be a commercial MHA product.
-
Citations
12 Claims
-
1. A method for obtaining 2-hydroxy-4-methylthiobutyric acid (MHA) which is stable in storage, comprising:
distilling a highly-concentrated liquid MHA containing >
95% by weight monomeric and oligomeric components of MHA for an average residence time of the MHA between 1 and 1×
104 s, under reduced pressure of between 1×
10-3 and 5×
104 Pa, at a temperature in a range between 40° and
200°
C., at which the monomeric MHA is converted into a gaseous state for a time period which is sufficiently short that formation of significant by-product components is avoided.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
Specification