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US Patent 7439391 Multi-stage glycolic acid crystallization

Patent 7439391 was granted and assigned to E.I. Du Pont De Nemours And Company on October, 2008 by the United States Patent and Trademark Office.

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Patent abstract

The present invention relates to a high yield process to prepare high purity crystalline glycolic acid using a multi-loop crystallization process characterized by high liquid and/or solid recycle, said process suitable for large scale purification and producing high purity glycolic acid with low diglycolic acid content.

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