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US 2026/0274781 A1Published application
Method for recovering heavy by-products from the manufacture of acrylic acid
AssigneeArkema France
InventorsMichel FAUCONET, Frederic SANDRE, Fanny DANTON
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Abstract
A process for regenerating acrylic acid (AA), by thermal cracking, from heavy by-products (residues referred to as AAHP) from an AA production unit, with a view to recycling them in the acrylic acid production plant. This process includes two steps: hydrolysis and cracking, carried out batchwise in the same reactor, and improves the current performance of cracking plants.
Claims12
A process for regenerating heavy by-products from an acrylic acid production unit (AAHP), said process comprising the following steps:
- i. introducing said heavy by-products into a reactor;
- ii. heating the heavy by-products at a hydrolysis temperature of between 80° C. and 200° C.;
- iii. adding water simultaneously or at a final temperature until a water/acrylic acid (AA) heavy products ratio of 0.1 to 1.3 is reached, progressively for a period of from 1 to 10 h to obtain a mixture of hydrolyzed products;
- iv. in the same reactor, subjecting said mixture containing the hydrolyzed heavy products and water to batch thermal cracking, producing a gaseous overhead stream containing acrylic acid (AA) and water and a bottom stream comprising residue concentrated in heavy products,
- v. recovering a lighter fraction rich in AA and water that can be recycled to various points in the process,
- vi. recovering said residue for the purpose of a removal treatment.
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Dependencies are inferred from the claim text.