Process for generating acid anhydrides
AssigneeCleantech Building Materials PLC
InventorsJohnathan Gorke, Brian Hashiguchi, Michael Konnick, Jeffrey Elks, Jeremy Patt, Juan Gamboa
Life of this patent
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Abstract
Provided is a method of producing an anhydride of an organic mono-acid comprising contacting an organic mono-acid and a thermally regenerable anhydride to produce the anhydride of the organic mono-acid, and either a diacid of the regenerable anhydride, a partially hydrolyzed regenerable anhydride, or both. In a particular example, acetic acid and glutaric anhydride can be reacted to form acetic anhydride.
Claims21
A method of producing an anhydride of a carboxylic acid comprising:
- contacting a carboxylic acid and a thermally regenerable carboxylic acid anhydride to produce the anhydride of the carboxylic acid and a diacid of the regenerable carboxylic acid anhydride or a partially hydrolyzed regenerable carboxylic acid anhydride;
- wherein a reaction between the carboxylic acid and the thermally regenerable carboxylic acid anhydride excludes the use of perchloric acid;
- forming a first stream comprising the anhydride of the carboxylic acid and unreacted carboxylic acid and a second stream comprising the diacid of the regenerable carboxylic acid anhydride or partially hydrolyzed regenerable carboxylic acid anhydride and unreacted regenerable carboxylic acid anhydride;
- separating the unreacted carboxylic acid from the anhydride of the carboxylic acid by distillation;
- and
- recycling the separated, unreacted carboxylic acid.
A method of producing an anhydride of a carboxylic acid comprising:
- contacting a carboxylic acid and a thermally regenerable carboxylic acid anhydride to produce the anhydride of the carboxylic acid and a diacid of the regenerable carboxylic acid anhydride or a partially hydrolyzed regenerable carboxylic acid anhydride;
- wherein a reaction between the carboxylic acid and the thermally regenerable carboxylic acid anhydride excludes the use of perchloric acid;
- forming a first stream comprising the anhydride of the carboxylic acid and unreacted carboxylic acid and a second stream comprising the diacid of the regenerable carboxylic acid anhydride or partially hydrolyzed regenerable carboxylic acid anhydride and unreacted regenerable carboxylic acid anhydride;
- separating the unreacted carboxylic acid from the anhydride of the carboxylic acid by distillation;
- and
- heating the second stream to regenerate the regenerable carboxylic acid anhydride.
A method of producing an anhydride of a carboxylic acid comprising:
- contacting a carboxylic acid and a thermally regenerable carboxylic acid anhydride to produce the anhydride of the carboxylic acid and a diacid of the regenerable carboxylic acid anhydride or a partially hydrolyzed regenerable carboxylic acid anhydride;
- wherein a reaction between the carboxylic acid and the thermally regenerable carboxylic acid anhydride excludes the use of perchloric acid;
- and
- adding the carboxylic acid over multiple stages.
A method of producing an anhydride of a carboxylic acid comprising:
- contacting a carboxylic acid and a thermally regenerable carboxylic acid anhydride to produce the anhydride of the carboxylic acid and a diacid of the regenerable carboxylic acid anhydride or a partially hydrolyzed regenerable carboxylic acid anhydride;
- wherein a reaction between the carboxylic acid and the thermally regenerable carboxylic acid anhydride excludes the use of perchloric acid;
- and
- adding a salt of the carboxylic acid.
A method of producing an anhydride of a carboxylic acid comprising:
- contacting a carboxylic acid and a thermally regenerable carboxylic acid anhydride to produce the anhydride of the carboxylic acid and a diacid of the regenerable carboxylic acid anhydride or a partially hydrolyzed regenerable carboxylic acid anhydride;
- wherein a reaction between the carboxylic acid and the thermally regenerable carboxylic acid anhydride excludes the use of perchloric acid;
- forming a first stream comprising the anhydride of the carboxylic acid and unreacted carboxylic acid and a second stream comprising the diacid of the regenerable carboxylic acid anhydride or partially hydrolyzed regenerable carboxylic acid anhydride and unreacted regenerable carboxylic acid anhydride;
- separating the unreacted carboxylic acid from the anhydride of the carboxylic acid by distillation;
- and
- diverting a portion of the carboxylic acid to a vessel containing the second stream.
Dependencies are inferred from the claim text.