PPT on HDPE

1. HDPE (High density
Polyethylene)
.

2. Zieglar-Natta catalyst
 .
Tm
X X
X
X
Al
R
R
R
Catalyst Co-catalyst
Tm - Transition metal from Group IV to Group VII Transition Element
X - Halogen atom
Al - Aluminum
R - Alkyl Group

3. Two component ZN Catalyst
 .
Transition Metal salt Organometallic Compound
(Catalyst) (cocatalyst)
TiCl4 ( C2H5)3 Al
TiCl3 Cl ( C2H5)2 Al
Zr(OC3H7)4 Al Cl ( C2H5)2 Al
VCl3 or VCl4 ( C2H5)3 Al

4. ZN catalyst Mechanism
 .

5. Manufacturing processes for HDPE
 1. Zieglar or Solution Process
 2. Slurry Process a. light hydrocarbon loop reactor process
b. heavier Hydrocarbon stirred tank reactor Process
 3. Phillips process
 4. Gas Phase process

6. Zieglar Process for HDPE
 Temp- 50 -90oC. Pressure -1-5 atm. In cyclohexane

7. Zieglar process
 .

8. Indiana process
 Solvent- cyclohexane or isopentane
 Catalyst is metal oxide such as cobalt molybdate
with sodium, calcium, or sodiumhydride as
promoter.
 Temperature - 230-270oC
 Pressure - 500-1000 psi

9. Philliphs Process (Chromium
Catalyst)
Chromium compound is supported on porous high surface area
oxide carrier such as Silica, silica-alumina, alumina and
Aluminophosphates.
Temp- 140-170oC, Pressure-500psi , diluent low boiling isobutene

10. Commercial PE Production
Technologies
 .

11. Molecular Weight Distribution curve
of HDPE resin

12. ZN vs Metallocene Catalyst
 .

13. Properties of Three commercial HDPE Grades

14. Injection Molding
 ZN catalyst based resin is used.
 MFI 3-80
 Cups, toys, housewares, crates, food
containers etc.

15. Blow molding
 Chromium catalyzed based resin is used.
 Resin with Broad molecular weight
distribution and low MFI
 MFI 0.1-0.5
 Bottles for food packaging, detergents,
oils
household material, industrial drums, fuel
tanks for automobiles.

16. Blow molding of HDPE
 .

17. Blown film
 Chromium catalyzed based resin is used.
 Metallocene catalyst for high clarity films.
 Food packaging, drum liners, grocery and
merchant bags, geomembrane sheeting.

18. Thermoforming
 Chromium catalyzed based resin is used.
 Stiffness, toughness and good melt
strength are all achieved from chromium
oxide catalyst base resin.
 MFI 0.05-0.2
 Trays, Pans, for lining the beds of pickup
tricks and other vehicles for flooring etc.

19. .
 Pipe and tubing- Chromium based
 Filaments- Zn and Chromium based
 Rotomolding Zn and metallocene based

20. Manufacturers
 .

21. General Properties of HDPE
 .

22. General properties of LDPE