Processes for producing (meth)acrylic acid

Details Processes for producing (meth)acrylic acid Processes for producing (meth)acrylic acid

2006-03-21

2006-03-21

Zucker, Paul A. (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

C562S598000

Reexamination Certificate

active

07015357

ABSTRACT:
In the purification and distillation step of acrylic acid (including (meth)acrylic acid), stable continuous operation for a long period is enabled by inhibiting the undesirable polymerization reaction of acrylic acid thereby to prevent the device from a trouble such as clogging. A process for producing acrylic acid which comprises purifying crude acrylic acid prepared by vapor-phase catalytic oxidation by distillation, wherein the concentration of β-acryloxypropionic acid in the feed stream to a distillation column mainly for the separation of water from acrylic acid is controlled to be at most one-fiftieth of the concentration of acrylic acid; the concentration of β-acryloxypropionic acid in the feed stream to a distillation column mainly for the separation of acetic acid from acrylic acid is controlled to be at most one-fortieth of the concentration of acrylic acid; and the concentration of β-acryloxypropionic acid in the feed stream to a distillation column mainly for the separation of acrylic acid from water, acetic acid and a solvent is controlled to be at most one-fiftieth of the concentration of acrylic acid.

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