Process for purifying a contaminated hydrochloric acid composition
US11352255B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 11, 2017 |
| Grant date | Jun 7, 2022 |
| Priority date | — |
| Expiry date | May 31, 2039 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07H1/00
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A purified hydrochloric acid composition is prepared from a stream of a contaminated hydrochloric acid composition by a process comprising a distillation treatment, wherein at least a first distillation column is operated at a first pressure and a second distillation column is operated at a second pressure, which second pressure is lower than the first pressure; wherein the contaminated hydrochloric acid composition comprises water, contaminants and hydrochloric acid in a first hydrochloric acid concentration of above the azeotropic composition of hydrochloric acid and water at the first pressure; wherein a part of the stream of the contaminated hydrochloric acid composition is fed into the first distillation column to yield a first bottom product comprising water and hydrochloric acid with a hydrochloric acid concentration below the first hydrochloric acid concentration and a first top product comprising hydrochloric acid in a concentration above the azeotropic hydrochloric acid composition at the first pressure; wherein at least a portion of the first bottom product is passed to the second distillation column; wherein another part of the stream of the contaminated hydrochloric ac…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.