Process for purifying (meth)acrylic acid
AssigneeRohm and Haas Company
InventorsAlan E. Sopchik, Stephen T. Cohn
Life of this patent
Estimating the term…
Abstract
A process for producing a grade of (meth)acrylic acid having residual formaldehyde levels of under 100 parts per million.
Claims11
A process for producing a pure grade (meth)acrylic acid, comprising contacting an aqueous crude (meth)acrylic acid, which comprises formaldehyde as an impurity, with at least 0.5 molar equivalent of cysteine per mole of formaldehyde impurity, wherein the contacting is conducted under conditions sufficient to reduce the concentration of the formaldehyde impurity to less than 100 ppm per 100 weight parts (meth)acrylic acid, wherein the aqueous crude (meth)acrylic acid comprises at least 5 wt. % water, and wherein the contacting is conducted in an absorber, quench tower, or dehydration column.
Dependencies are inferred from the claim text.