PROCESS FOR PREPARING ACRYLIC ACID BY A THERMOLYSIS OF POLY-3-HYDROXYPROPIONATE CATALYZED BY AT LEAST ONE MOLECULAR ACTIVE COMPOUND
First Claim
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1. A process for preparing acrylic acid, comprising:
- thermolyzing poly-3-hydroxypropionate in the presence of a catalyst of at least one molecular organic active compound comprising a tertiary nitrogen atom covalently bonded to three different carbon atoms, thereby obtaining the acrylic acid,whereinthe at least one molecular organic active compound comprises;
no heteroatom other than carbon and hydrogen over and above nitrogen and oxygen,no nitrogen covalently bonded to one or more hydrogen atoms,at most one oxygen atom covalently bonded to a hydrogen atom,no oxygen atom which comprises a covalent double bond to any of the three different carbon atoms, andneither a radical of an aromatic hydrocarbon nor a radical of a substituted aromatic hydrocarbon, andthe at least one molecular organic active compound has a boiling point of at least 150°
C. and at most 350°
C. at a pressure of 1.0133·
105 Pa, anda melting point of at most 70°
C. at a pressure of 1.0133·
105 Pa.
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Abstract
A process for preparing acrylic acid by thermolysis of poly-3-hydroxypropionate in the presence of one or more specific tertiary amines as a catalyst.
29 Citations
37 Claims
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1. A process for preparing acrylic acid, comprising:
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thermolyzing poly-3-hydroxypropionate in the presence of a catalyst of at least one molecular organic active compound comprising a tertiary nitrogen atom covalently bonded to three different carbon atoms, thereby obtaining the acrylic acid, wherein the at least one molecular organic active compound comprises; no heteroatom other than carbon and hydrogen over and above nitrogen and oxygen, no nitrogen covalently bonded to one or more hydrogen atoms, at most one oxygen atom covalently bonded to a hydrogen atom, no oxygen atom which comprises a covalent double bond to any of the three different carbon atoms, and neither a radical of an aromatic hydrocarbon nor a radical of a substituted aromatic hydrocarbon, and the at least one molecular organic active compound has a boiling point of at least 150°
C. and at most 350°
C. at a pressure of 1.0133·
105 Pa, anda melting point of at most 70°
C. at a pressure of 1.0133·
105 Pa. - 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)
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Specification