Method for producing acrylic acid and acrylic acids esters
AssigneeBASF SE
InventorsGerhard Nestler, Jürgen Schröder, Gerhard Bolz
Life of this patent
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Abstract
A process for preparing acrylic acid and/or acrylates, which comprises stage A with or without stages B and C: A: cooling a gaseous reaction mixture which comprises acrylic acid and is obtained in the gas-phase oxidation to prepare acrylic acid, using an inert high-boiling solvent, to give a gaseous mixture comprising acrylic acid; B: separating the gaseous mixture comprising acrylic acid to give a low-boiling fraction, a crude acrylic acid, and a bottom product, and C: esterifying the crude acrylic acid obtained in stage B by means of one or more alkanols to give an esterification mixture comprising one or more acrylates and one or more acetic esters.
Claims20
A process comprising:
- obtaining an acrylic acid gaseous reaction mixture by gas-phase oxidation;
- cooling said mixture in the presence of an inert high-boiling solvent;
- and
- separating said mixture to provide a low-boiling fraction, a crude acrylic acid fraction, and a bottoms product.
A process for preparing an acrylate, or a mixture of two or more thereof, which comprises:
- A:
- cooling a gaseous reaction mixture which comprises acrylic acid and is obtained in the gas-phase oxidation to prepare acrylic acid, using an inert high-boiling solvent, to give a gaseous mixture comprising acrylic acid;
- B:
- separating the gaseous mixture comprising acrylic acid to give a low-boiling fraction, a crude acrylic acid, and a bottom product;
- and
- C:
- esterifying the crude acrylic acid obtained in stage B by means of one or more alkanols to give an esterification mixture comprising one or more acrylates and one or more acetic esters.
A process comprising:
- obtaining an acrylic acid gaseous reaction mixture by gas-phase oxidation;
- cooling said mixture in the presence of an inert high-boiling solvent;
- separating said mixture to provide a low-boiling fraction, a crude acrylic acid fraction, and a bottoms product, wherein said separating is conducted in a distillation column;
- and
- obtaining the crude acrylic acid via a sidestream takeoff of the distillation column.
A process comprising:
- obtaining an acrylic acid gaseous reaction mixture by gas-phase oxidation;
- cooling said mixture in the presence of an inert high-boiling solvent;
- separating said mixture to provide a low-boiling fraction, a crude acrylic acid fraction, and a bottoms product, wherein said separating is conducted in a distillation column;
- obtaining the crude acrylic acid via a sidestream takeoff of the distillation column;
- and
- converting said crude acrylic acid to pure acrylic acid, said separating is conducted in a distillation column.
Dependencies are inferred from the claim text.