Glycerol (medical grade) preparation method using a by-product of a bio-diesel process
US7998317B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Sep 5, 2008 |
| Grant date | Aug 16, 2011 |
| Priority date | — |
| Expiry date | Apr 7, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S203/08
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A glycerol preparation method for preparation of medical grade glycerol from a by-product of a bio-diesel process includes a first stage phosphoric acid chemical reaction process and a posterior by-product centrifugal separation process to have the phosphoric acid chemical reaction by-product be separated into free fatty acid, potassium phosphoric acid, and a crude glycerol and methanol mixture. The crude glycerol and methanol mixture is further processed through a first step of thin film evaporation process where methanol is reclaimed, a second step of thin film evaporation process where the mixture is dehydrated, a third step of molecular distillation process where an industrial grade glycerol of purity over 95% is extracted, and a fourth step of molecular distillation process where a medical grade glycerol of purity in exceed of 99.75% that meets USP/BP standards is extracted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.