Continuous process for producing an aqueous solution of ferric chloride
US4066748A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 13, 1976 |
| Grant date | Jan 3, 1978 |
| Priority date | — |
| Expiry date | Aug 13, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S423/16
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An aqueous solution of ferric chloride directly usable for purifying water is produced from a pickling liquor containing ferrous chloride by a process comprising the steps of PA0 1. continuously concentrating the pickling liquor by evaporation to at least about 34.25% by weight ferrous chloride concentration; PA0 2. continuously neutralizing the resulting concentrated liquor, which still contains free hydrochloric acid, by means of a fluidized bed of iron oxide particles (e.g. mill scales); and PA0 3. continuously countercurrently chlorinating the resulting neutralized concentrated liquor in two successive reaction zones, to the extent of from 73 to 86% at a temperature of from 35.degree. to 75.degree. C in the first reaction zone and the balance at a temperature of from 40.degree. to 100.degree. C in the second reaction zone. The product of said process is an aqueous solution containing per liter at least 40% by weight of ferric chloride, less than 0.1% by weight of ferrous chloride and less than 0.1% by weight of ferrous chloride. Chlorination yield is practically quantitative.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.