Reduced down time for maintenance, Reduced loss of the feedstock due to polymerisation, Less pre-polymer deposits and improved efficiency.

Transcription

1 GEOlube CL 1400 S Product Data GEOlube CL 1400 S TECHNICAL DATA SHEET Europe Charleston Road Hardley, Hythe Southampton, Hampshire SO45 3ZG UK Introduction During the production of low-density polyethylene, the ethylene gas feedstock is compressed at pressures up to 3500 bar. The final stage compression is carried out in high speed reciprocating compressors known as hyper-compressors. A variety of lubricants are suitable for use with hypercompressors. However, polyalkylene glycols (PAGs) are generally the most cost effective. North America 300 Brookside Avenue Building #23, Suite 100 Ambler, PA USA (Toll Free ) GEOlubricants@geosc.com Typical Physical Properties* Property Value Method Viscosity@ 40 C, cst 272 ASTM D C, kg/m ASTM D1298 Viscosity index Flash point, COC, C 259 ASTM D92 Pour point, C -7 ASTM D97 * The typical values presented here are believed to be accurate; they should not, however, be considered to constitute a specification.

2 Advantages over other types of lubricants are as follows: 1. PAGs are much less soluble in ethylene than are white oils and polyisobutylenes; therefore, a two-fold advantage is observed: a. viscosity reduction due to ethylene dissolving in the lubricant is minimised, b. lubricant is much less likely to be removed or washed from the plunger running zone. Thus, the overall lubricant consumption and compressor maintenance requirements are reduced. The consumption of polyalkylene glycol is usually less than half the corresponding consumption of white oil or polyisobutylene in the same conditions. 2. PAGs have superior load carrying and lubricant performance compared to white oils and polyisobutylenes, thus minimising wear on plungers and packings. Typical lifetime figures for packings reported by end users are in the range of 20,000-40,000 hrs. 3. PAGS have relatively flat pressure-viscosity characteristics compared to white oils and polyisobutylenes and mixtures thereof. This means that they flow more readily in the compressor high pressure lubricant lines and are much less likely to solidify in the lines at lower temperatures - see figures 1,2 & 3. For these reasons, polyalkylene based ethylene compressor lubricants offer the best possible lubricating performance with outstanding economy. GEOlube CL 1400 S proves to be the most effective at reducing pre-polymer formation and is also recommended for use under conditions where co-polymers of ethylene with other monomers are being manufactured, for example, vinyl acetate monomer. GEOlube CL 1400 S is recommended for co-polymers of ethylene and vinyl acetate (VAM) containing up to 15% vinyl acetate. In the polymerisation of ethylene where conditions result in some pre-polymerisation of the ethylene in the hyper-compressor or heat exchanger, GEOlube CL 1400 S offers performance advantages, including: Reduced down time for maintenance, Reduced loss of the feedstock due to polymerisation, Less pre-polymer deposits and improved efficiency. GEOlube CL 1400 S is a stable, non-corrosive, high flashpoint liquid which can be stored in mild steel tanks under air or nitrogen. However, it can absorb moisture so appropriate measures to avoid this should be taken. 2

3 Comparison with Polyisobutylene / White Oil Blends This lubricant is widely used and generally preferred to lubricants containing either single components. Typically it must be heated at 40 C before entering the cylinder, otherwise viscosity problems can be encountered. This is not required for GEOlube CL1400 S PAG. The consumptions of PIB/white oil lubricants are also typically substantially higher than with PAG type lubricants and the packing life significantly lower. Problems can also be encountered due to the interaction with the additives in the PIB/white oils lubricants. The carry over of small quantities of PAG lubricants also appears to have a positive effect on film strength, compared to where PIB/white oil lubricant has been used, during the manufacture of polyethylene film. In favour of the PIB / white oil solution is its lower unit cost, though this is more than offset by higher consumption compared with PAG. PIB / white oil should be preferred for polyethylene which is to be used for the manufacture of high tension cable grades as it has less effect on the dielectric constant of polyethylene. In most cases therefore, polyalkylene glycols are considered the lubricant of choice. Figure 1: Viscosity & Temperature Curves for polyethylene compressor lubes GEOlube CL

4 Figure 2: Viscosity & Pressure Curves for polyethylene compressor lubes GEOlube CL 1400 GEOlube CL 1300 Figure 3: Viscosity & Pressure Curves for polyethylene compressor lubes GEOlube CL 1300 GEOlube CL

5 OEM Approvals GEOlube CL 1400 S has been tested and approved by Burckhardt Compression AG. Product Compliance GEOlube CL 1400 S is manufactured to comply with the following FDA 21CFR sections: and may therefore be used in relevant applications where the potential for incidental food contact may exist. The FDA Status of this material has been independently certified by NSF and it is included in the current NSF White Book Listing of Nonfood Compounds. Nonfood Compounds Program Listed Category H1 Registration# GEOlube CL 1400 S is produced exclusively from components listed as additives in Synoptic Document N.7, Draft of Provisional list of monomers and additives used in the manufacture of plastics and coatings intended to come into contact with foodstuffs. The Commission of the European Communities Directorate General III Industry Industrial Affairs III: Consumers Goods Industries. Foodstuffs Legislation and Scientific and Technical Aspects, Ref CS/PM/2356. GEOlube CL 1400 S conforms to the Halal requirements in accordance with Islamic Law. (Copy of Halal Certificate available on request). Kosher Status of GEOlube CL 1400 S : Pareve Passover (Copy of Kosher Certificate available on request) 5

6 Registration & Regulatory Information Please refer to the safety datasheet. Handling & Storage This product can be stored for at least 2 years at ambient storage temperature and conditions without any deterioration. Please refer to the safety datasheet for all relevant information. Miscellaneous Various pack types available; please contact your local GEO Specialty Chemicals representative for further information. GEOlube is a registered trademark of GEO Specialty Chemicals, Inc. All information and data, including the formulations and procedures discussed herein, are believed to be correct. However, this should not be accepted as a guarantee of their accuracy, and confirming tests should be run in your laboratory or plant. No statement should be construed as a recommendation for any use which would violate any patent rights. Sales of all products are pursuant to terms and conditions included in GEO Specialty Chemicals sales documents. Nothing contained therein shall constitute a guarantee or warranty with respect to the products described or their use. Safety information regarding these products is contained in their Safety Data Sheets. Users of these products are urged to review and use this information. 6 Reviewed: November 2017