Method for the dosage of a fluidized polymerization catalyst into a polymerization reactor
US5385992A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 26, 1993 |
| Grant date | Jan 31, 1995 |
| Priority date | — |
| Expiry date | Oct 26, 2013 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B7/06
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method is provided for controlling the dosage of a fluidized polymerizing catalyst into a polymerization reactor. The method comprises mixing a solid polymerization catalyst with wax and feeding the flowing catalyst-wax mixture through a pipe to the dosage pump. The inlet opening of the cylinder of the dosage pump is opened to draw catalyst-wax mixture through the inlet opening by means of the back motion of the piston. The inlet opening is then closed and the outlet opening is opened. Flowing catalyst-wax mixture is then pressed from the cylinder through the outlet opening by means of the back motion of the piston. The outlet opening is then closed. Opening and closing of the inlet and outlet openings is carried out by rotating an intermediate pipe arranged between the cylinder and piston so that a transmission opening in the intermediate pipe moves upon either the inlet or outlet opening. The intermediate pipe surface always covers at least one of the inlet or outlet openings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.