But figuring out exactly how to regenerate ammonia borane from the residuum left after hydrogen has been extracted remains a stumbling block. |
This SSB product contains no residuum and low sulphur content, providing an attractive feedstock to refineries. |
The barite ore is massive and occurs within residuum derived from carbonate units. |
From balsam of copaiba, by distilling off the oil until the residuum assumes the consistence of an extract. |
All the rest of the state was a mere unprivatisable residuum, which had to be preserved for electoral reasons but which would never be much good. |
But solutions can also form deposits by dissolving and removing valueless material, leaving a residuum of less-soluble ore minerals. |