Process and apparatus for concentrating corrosive liquid using radiant heat
US4164441A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | May 31, 1977 |
| Grant date | Aug 14, 1979 |
| Priority date | — |
| Expiry date | May 31, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D1/22
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A corrosive liquid such as sulphuric acid is concentrated using two spaced concentric tubes. A film of the acid flows down the inside of the inner tube and hot flue gases contact the outside of the outer tube. Advantageously, the inner tube transmits radiant energy, e.g. is made of quartz, so the outer tube heats the inner tube by radiation. This absence of mechanical stress on the inner tube increases its life. The water vapor is taken off at the top of the inner tube and concentrated solution at the bottom. If desired, the tubes could be reversed with the flue gases going through the inner tube and the outer tube being of quartz with the liquid flowing on its outside.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.