Method for production of purified (meth)acrylic acid
AssigneeRohm and Haas Company
InventorsKeith F. Briegel, Michael Stanley DeCourcy, James Elder, James Jerrick Juliette, Joy Lydon Mendoza
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Abstract
The present invention relates to reducing corrosion of distillation equipment during azeotropic distillation of (meth)acrylic acid in the presence of dissolved copper, by providing aqueous (meth)acrylic acid having not more than 0.1% by weight formaldehyde, based on the total weight of the aqueous (meth)acrylic acid. The source of the copper may, for example, be copper-based polymerization inhibitors added to the aqueous (meth)acrylic acid and/or distillation equipment.
Claims10
A method for minimizing corrosion of apparatus during distillation of aqueous (meth)acrylic acid in the presence of dissolved copper, comprising:
- a) providing an aqueous acrylic acid feed stream comprising acrylic acid, water, and formaldehyde, wherein formaldehyde is present in an amount of not more than 0.1% by weight, based on the total weight of the aqueous acrylic acid stream;
- and
- b) purifying the aqueous acrylic acid feed stream by azeotropic distillation in the presence of dissolved copper.
Dependencies are inferred from the claim text.