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US 2001/0020111 A1Published application
Method for producing acrylic acid
AssigneeNippon Shokubai Co., Ltd.
InventorsKouji Ueno, Masatoshi Ueoka, Sei Nakahara
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Abstract
A method of producing highly purified acrylic acid in a high yield is provided. A method of producing acrylic acid including the steps of an oxidation step, an absorption step, a distillation step, a crystallization step, and a dimer decomposition step.
Claims17
A method for producing acrylic acid, comprising:
- an oxidation step, an absorption step, a distillation step, a crystallization step, and a dimer decomposition step.
A method for producing acrylic acid, the method comprises the steps of:
- a) catalytic vapor phase oxidizing propylene and/or acrolein with a molecular oxygen containing gas;
- b) introducing the obtained gaseous mixture to an acrylic acid absorption column, and contacting the mixture with a solvent to absorb the mixture as a solution containing acrylic acid;
- c) subjecting the solution containing acrylic acid to a distillation step to separate a crude acrylic acid substantially not containing solvent from the solution as a column bottom stream and/or a column side stream;
- d) feeding the crude acrylic acid to a crystallization step to melt crystallize the acrylic acid and separate the acrylic acid into a purified acrylic acid and a residual mother liquid;
- and
- e) feeding the residual mother liquid to an acrylic acid dimer decomposition step to obtain a distillate, and feeding the distillate to at least one step selected from the group consisting of the crystallization step, the distillation step, and the absorption step.
3 more elements
Dependencies are inferred from the claim text.