반응 #1470446

반응 방정식

styrene

styrene

ethylene

styrene

Tris(pentafluorophenyl)boron

hydrogen

ethylene

→

Ethylene/Styrene

용매

isopentane

cyclohexane

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후처리

1. 1
   기타The polymer is prepared in a 400 gallon (1514 liter)
2. 2
   기타are purified
3. 3
   기타to remove water and oxygen
4. 4
   기타The inhibitor in the styrene is also removed
5. 5
   기타Inerts are removed
6. 6
   기타by purging the vessel with ethylene
7. 7
   workup.ADDITIONHydrogen is added
8. 8
   기타vessel is controlled
9. 9
   기타Prior to polymerization
10. 10
    온도the vessel is heated to the desired run temperature
11. 11
    workup.ADDITIONadded to the vessel
12. 12
    온도to maintain vessel pressure
13. 13
    온도to maintain a mole ratio with respect
14. 14
    농축to the ethylene concentration
15. 15
    기타ethylene is removed from the reactor, about 1000 ppm of Irganox™ 1010 anti-oxidant
16. 16
    workup.ADDITIONis then added to the solution
17. 17
    기타the polymer is isolated from the solution
18. 18
    기타The resulting polymers are isolated from solution
19. 19
    기타by stripping with steam in a vessel

실험 절차

The polymer is prepared in a 400 gallon (1514 liter) agitated semi-continuous batch reactor. The reaction mixture consists of about 250 gallons (946 liter) of styrene and a solvent comprising a mixture of cyclohexane (85 weight percent) and isopentane (15 weight percent). Prior to addition, solvent, styrene and ethylene are purified to remove water and oxygen. The inhibitor in the styrene is also removed. Inerts are removed by purging the vessel with ethylene. The vessel is then pressure controlled to a set point with ethylene. Hydrogen is added to control molecular weight. The temperature in the. vessel is controlled to set-point by varying the jacket water temperature on the vessel. Prior to polymerization, the vessel is heated to the desired run temperature and the catalyst components, i.e. (tert-butylamido)dimethyl(tetramethyl-η5-cyclopentadienyl)silane 5dimethyltitatium(IV) catalyst, CAS# 135072-62-7, Tris(pentafluorophenyl)boron, CAS# 001109-15-5, Modified methylaluminoxane Type 3A, CAS# 146905-79-5, are flow controlled, on a mole ratio basis of 1/3/5 respectively, combined and added to the vessel. After starting, the polymerization is allowed to proceed with ethylene supplied to the reactor as required to maintain vessel pressure. In some cases, hydrogen is added to the headspace of the reactor to maintain a mole ratio with respect to the ethylene concentration. At the end of the run, the catalyst flow is stopped, ethylene is removed from the reactor, about 1000 ppm of Irganox™ 1010 anti-oxidant is then added to the solution and the polymer is isolated from the solution. The resulting polymers are isolated from solution by stripping with steam in a vessel. In the case of the steam stripped material, additional processing is required in extruder like equipment to reduce residual moisture and any unreacted styrene.

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