Reaction #79447

Reaction equation

ethanol

triisobutylaluminum

ethylene

methanol

ethylene

→

ethylene/1-octene

Conditions

Workup

1. 1
   OtherTo a 2 liter-stainless steel autoclave thoroughly purged with nitrogen, 600 ml of hexane and 300 ml of 1-octene
2. 2
   workup.ADDITIONwere introduced
3. 3
   Otherwas elevated to 60° C
4. 4
   Otherpolymerization
5. 5
   Temperatureto maintain the total pressure at 3.0 Kg/cm2-G
6. 6
   Otherto terminate
7. 7
   Otherthe polymerization
8. 8
   Otherthe unreacted ethylene was purged out
9. 9
   OtherThe resulting reaction solution
10. 10
    Otherto precipitate a polymer
11. 11
    OtherThe polymer was separated by filtration
12. 12
    Otherdried overnight under reduced pressure

Procedure

To a 2 liter-stainless steel autoclave thoroughly purged with nitrogen, 600 ml of hexane and 300 ml of 1-octene were introduced, and the temperature of the system was elevated to 60° C. Then, 1 mmol of triisobutylaluminum and 0.5 ml (0.001 mmol in terms of Zr) of the catalyst solution prepared above were injected into the autoclave together with ethylene to initiate polymerization. Thereafter, only ethylene was continuously fed to maintain the total pressure at 3.0 Kg/cm2-G, and the polymerization was performed at 70° C. for 60 minutes. Then, a small amount of ethanol was fed to the system to terminate the polymerization, and the unreacted ethylene was purged out. The resulting reaction solution was introduced into a large excess of methanol to precipitate a polymer. The polymer was separated by filtration and dried overnight under reduced pressure, to obtain a long-chain branched ethylene/1-octene random copolymer.

Source