Method and system for refining long chain dicarboxylic acid
US11155512B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | May 29, 2020 |
| Grant date | Oct 26, 2021 |
| Priority date | — |
| Expiry date | May 29, 2040 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC12P7/44
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present disclosure provides a method and a system for refining long chain dicarboxylic acid, said method comprising the following steps: (1) subjecting a long chain dicarboxylic acid fermentation broth or a treated liquid therefrom to a membrane filtration, an acidification/crystallization, a solid-liquid separation and drying to give a long chain dicarboxylic acid crude product; (2) subjecting the long chain dicarboxylic acid crude product to a vacuum distillation to give the long chain dicarboxylic acid product; wherein the pressure in the vacuum distillation is ≤100 Pa. By using the refining method according to the present disclosure, the procedure is simplified, and the purity of the obtained product is high, and the disadvantages such as poor quality of the product obtained by crystallization from a solvent and environment pollution caused by a solvent can be overcome.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.