Stirring apparatus and stirring tower type apparatus for polmerization reactions
US5145255A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 13, 1990 |
| Grant date | Sep 8, 1992 |
| Priority date | — |
| Expiry date | Dec 13, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2219/185
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
In order to improve mixing efficiency of highly viscous fluid, while structural simplicity being maintained, two types of stirring impellers are employed in a single stirring apparatus. One of such stirring impellers is a large flat impeller and the other is a slanted or screw-shaped impeller to cause an up-and-down flow. This principle is further utilized in a stirring tower type polymerization reaction apparatus which has an array of mixing areas, each of which corresponds to the stirring apparatus above, and partitions between the mixing areas. The partitions are disposed so that the temperature of reaction can be controlled easily. Undesirable effects such as "dead space", space in which flow is insufficient, and the attachment of gelled material to the rotational shaft can be avoided while rather obvious, but no less important, advantages of efficient and uniform mixing, etc., are secured.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.