Process for preparing acrylic acid from ethylene oxide and carbon monoxide
First Claim
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1. A process for preparing acrylic acid from ethylene oxide and carbon monoxide, the process comprising:
- converting by carbonylating ethylene oxide dissolved in an aprotic solvent with carbon monoxide at elevated pressure and elevated temperature in the presence of a catalyst system comprising a cobalt source in a reaction zone A to obtain a product mixture A comprising poly-3-hydroxypropionate,removing poly-3-hydroxypropionate from the product mixture A in a separation zone A, andthermolyzing poly-3-hydroxypropionate removed in separation zone A in a thermolysis zone A to form acrylic acid,wherein the removing comprises at least one of;
adding water, an aqueous solution, or both, as an aqueous precipitation liquid to a portion of product mixture A, to a total amount of product mixture A, or both, in order to precipitate poly-3-hydroxypropionate presently dissolved in the portion of product mixture A or in the total amount of product mixture A;
orwashing poly-3-hydroxypropionate removed from product mixture A in separation zone A with water, with an aqueous solution, or both, as an aqueous wash liquid.
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Abstract
A process for preparing acrylic acid from ethylene oxide and carbon monoxide, in which ethylene oxide is carbonylated in an aprotic solvent with carbon monoxide in the presence of a cobalt catalyst system to give poly-3-hydroxypropionate, the cobalt content in the poly-3-hydroxypropionate formed is reduced with the aid of water and/or an aqueous solution as a precipitation and/or wash liquid, and the poly-3-hydroxypropionate is subsequently split by thermolysis to give acrylic acid.
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Citations
43 Claims
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1. A process for preparing acrylic acid from ethylene oxide and carbon monoxide, the process comprising:
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converting by carbonylating ethylene oxide dissolved in an aprotic solvent with carbon monoxide at elevated pressure and elevated temperature in the presence of a catalyst system comprising a cobalt source in a reaction zone A to obtain a product mixture A comprising poly-3-hydroxypropionate, removing poly-3-hydroxypropionate from the product mixture A in a separation zone A, and thermolyzing poly-3-hydroxypropionate removed in separation zone A in a thermolysis zone A to form acrylic acid, wherein the removing comprises at least one of; adding water, an aqueous solution, or both, as an aqueous precipitation liquid to a portion of product mixture A, to a total amount of product mixture A, or both, in order to precipitate poly-3-hydroxypropionate presently dissolved in the portion of product mixture A or in the total amount of product mixture A;
orwashing poly-3-hydroxypropionate removed from product mixture A in separation zone A with water, with an aqueous solution, or both, as an aqueous wash liquid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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Specification