Spray drying method
US6308434A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 9, 2001 |
| Grant date | Oct 30, 2001 |
| Priority date | — |
| Expiry date | Jan 9, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D1/18
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Improved spray drying methods of have been developed. The spray drying method includes use of a primary drying chamber and a secondary drying apparatus which includes tubing having a length sufficient to increase the contact time between the drying gas and the droplets/particles to dry the particles to the extent desired, at a drying rate and temperature which would be too low to provide adequate drying without the secondary drying apparatus. The secondary drying apparatus increases the drying efficiency of the spray dryer system without increasing the drying rate, while minimizing loss in yield. The ratio of the length of tubing to the length of the primary drying chamber is at least 2:1. The tubing diameter is substantially smaller than the diameter of the primary drying chamber, such that the particles move at higher velocity through the tubing to minimize product losses. The ratio of the cross-sectional area of the primary drying chamber to the cross-sectional area of the tubing most preferably is about 16:1. The tubing preferably is in a compact coil design, which can more easily be transported and which has minimum space requirements, and may optionally include a jacket to co…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.