Purification of liquid streams using carbon dioxide
US6221254A · kind A · utility
Inventors
Key dates
| Filing date | Aug 25, 1998 |
| Grant date | Apr 24, 2001 |
| Priority date | — |
| Expiry date | Aug 25, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/905
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method of purifying an aqueous liquid stream is provided, wherein the liquid stream is pressurized and contains proteinaceous materials, such as blood, and suspended solids, comprising the introduction of carbon dioxide into the liquid stream in a manner to reduce the pH of the liquid stream sufficient to cause coagulation ofthe proteinaceous materials. Specifically, it is intended that the pH of the liquid stream is reduced to a level below the isoelectric point of the proteinaceous materials, preferably at a level below pH 4.5. In a preferred method, the liquid stream is moved by a dissolved gas pump, wherein the carbon dioxide is introduced into the dissolved gas pump, and wherein a first portion of the gas is caused to dissolve within the liquid stream, and a second portion of the gas is caused to entrain within the liquid stream in the form of micro-fine bubbles. The method further preferably comprises reducing the pressure of the liquid stream in an amount sufficient to cause the further formation of bubbles which adhere to the proteinaceous materials which have coagulated and which reduces the pH of the liquid stream; recovering the gas which escapes the liquid stream; and…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.