| 摘要 |
<p>The invention concerns a method of obtaining a concentrated tobacco extract, for use in a smoking material, from a dilute aqueous extract in which reverse osmosis is applied to the dilute extract, using a membrane substantially impermeable to the solute components of the extract. The reverse-osmosis process may be performed at substantially ambient temperature and at a pressure within the range of from 39 to 49 kg/cm2.</p> |
