Agitator for a horizontal polymerization reactor having contiguous paddle stations with paddles and sub-stations with sub-station paddles
US6350054B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 7, 1998 |
| Grant date | Feb 26, 2002 |
| Priority date | — |
| Expiry date | Dec 7, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2219/182
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Improved apparatus for mechanically stirring a quench-cooled subfluidized particulate bed of polymerized monomer lowers lumping of polymer particles by using substantially contiguous paddle stations disposed along the drive shaft within the reactor in combination with a plurality of sub-stations in at least one paddle station class, each sub-station having a width along the shaft of no more than 50 percent of the total width of the paddle station, and sub-station paddles attached to the shaft at each sub-station so as to sweep through the particulate bed. In some embodiments, a first class of stations is, advantageously, disposed within the reactor along a portion of the drive shaft in repeating groups of at least two stations and a second class of stations with sub-stations is disposed within the reactor along another portion of the drive shaft, preferably in repeating groups of at least one more than the number of stations in the repeating group of the first class, to further reduce lumping of polymer particles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.