Browse Prior Art Database

USE OF A STAINLESS STEEL METAL CLOTH FOR FILTRATION OF POLYOLEFIN CATALYST

IP.com Disclosure Number: IPCOM000031460D
Publication Date: 2004-Sep-27
Document File: 1 page(s) / 8K

Publishing Venue

The IP.com Prior Art Database

Abstract

In traditional olefin catalyst manufacture, a Funda filter using a 20 micron TEFLON® cloth has been used to capture catalysts and separate them from solvents during manufacture. A stainless steel cloth with the same 20 micron can serve the same function. Filtration rates using the stainless steel cloth increased from 20% to 250%, depending on the manufacturing stage and the catalyst being manufactured. These improved filtration rates enhance the overall capture efficiency of the filter and thus increase the unit's production rate. Further, the increased filtrate flow rate may allow batch cycle times to be reduced by 3-10%. The improved capture efficiency may also allow the scale-up of catalyst systems to larger batch sizes. The higher filtrate flow rates have also enabled the reduction of residual solvents such as monochlorobenzene from the catalysts. This decrease in residual solvent allows for more removal during the washing step and thus a purer product.

This text was extracted from a Microsoft Word document.
This is the abbreviated version, containing approximately 76% of the total text.

USE OF A STAINLESS STEEL METAL CLOTH FOR FILTRATION OF POLYOLEFIN CATALYST

Polyolefin catalysts are used to make polymers from one or more alpha olefins such as ethylene, propylene, butene and higher alpha olefins.  Diene containing monomers may be included as comonomers also.  These catalyst may be used in gas phase, slurry, high pressure and solutions processes or combinations of these processes.  A wide variety of catalysts are used including, but limited to, Ziegler-Natta or metallocene single-site catalysts.

In traditional polyolefin catalyst manufacture, a multi-leaf filters have has been used to capture catalysts and separate them from solvents during manufacture.  Filter types include multi-leaf, Nutsche single plate, Rosenmund single place and rotating types such as Funda and Schenk.  Filter mesh sizes range from 10 to 70 for these applications.  Typically a 20 micron TEFLON® filter cloth is used in many processes.   A metal filter cloth with the same nominal size (20 micron mesh size) can serve the same function.

Filtration rates using the stainless steel cloth can be increased from 20% to 250%, depending on the manufacturing stage and the catalyst being manufactured.  These improved filtration rates enhance the overall capture efficiency of the filter and thus increase the unit’s production rate.  Further, the increased filtrate flow rate may allow shorter total filtration time and thus batch cycle times to be reduced by 3-10%.  The improved capture...