Limestone-based sorbent agglomerates for removal of sulfur compounds in hot gases and method of making
US4316813A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 4, 1980 |
| Grant date | Feb 23, 1982 |
| Priority date | — |
| Expiry date | Aug 4, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J20/3042
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Sulfur-containing compounds such as hydrogen sulfide and sulfur oxides arising from gasification or combustion of organic fuels such as coal may be removed from the hot gases by attrition resistant, highly reactive limestone-based sorbent agglomerates. The agglomerates are formed by crushing and powdering naturally occurring limestone into grains of fine particle size and binding the powdered limestone grains with a binder that is stable at high temperature, for example a colloidal grade of attapulgite clay. Volatile liquid is added to the mix of binder and powdered limestone to form a paste-like mixture, which is then agglomerated in compression-type agglomerating equipment to form spheroidal agglomerates having good green strength. In fluidized bed combustion applications, these agglomerates have attrition resistance equivalent to conventional natural limestone granules and are far more reactive in terms of sulfur pickup.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.