ACRYLIC ACID PRODUCTION METHODS
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Abstract
In one aspect, the present invention encompasses safe and efficient methods for providing highly pure acrylic acid. In certain embodiments, the inventive methods include the step of producing polypropiolactone from ethylene oxide at a first location, transporting the polymer to a second location and pyrolyzing the polypropiolactone to provide glacial acrylic acid. In certain embodiments, the step of pyrolyzing the polymer is performed continuously in conjunction with a polymerization process to make SAPs.
36 Citations
49 Claims
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1-27. -27. (canceled)
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28. A method for producing polyacrylic acid, comprising:
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forming polypropiolactone at a first location; pelletizing at least some of the polypropiolactone; transporting at least some of the pelletized polypropiolactone from the first location to a second location by truck, train, tanker, barge, or ship, or any combinations thereof; converting at least some of the pelletized polypropiolactone to acrylic acid at the second location; and directly feeding the acrylic acid to an acrylic acid polymerization reactor. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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43. A method for producing polyacrylic acid, comprising:
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contacting ethylene oxide with carbon monoxide in the presence of a metal carbonyl compound at a first location to produce beta propiolactone; reacting the beta propiolactone with a polymerization initiator to form polypropiolactone at the first location; pelletizing at least some of the polypropiolactone at the first location; transporting at least some of the pelletized polypropiolactone from the first location to a second location by truck, train, tanker, barge, or ship, or any combinations thereof; converting at least some of the pelletized polypropiolactone to acrylic acid at the second location; and directly feeding the acrylic acid to an acrylic acid polymerization reactor without isolation and storage of the acrylic acid, wherein the method does not require the addition, removal, or a combination thereof, of stabilizers to or from the acrylic acid fed directly to the acrylic acid polymerization reactor. - View Dependent Claims (44, 45, 46)
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47. A method for producing polyacrylic acid, comprising:
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transporting polypropiolactone from a first location to a second location by truck, train, tanker, barge, or ship, or any combinations thereof; converting at least some of the polypropiolactone to acrylic acid at a second location; and directly feeding the acrylic acid to an acrylic acid polymerization reactor without isolation and storage of the acrylic acid. - View Dependent Claims (48, 49)
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Specification