Claims
- 1. A process for the high pressure production of homopolymers of ethylene, which comprises:
- (a) introducing a feed material comprising ethylene in a non-batchwise manner into a polymerization zone which does not contain a dispersant, which is maintained at a pressure of at least 200 atmospheres and at a temperature of 150.degree.-320.degree. C. and which contains a catalyst comprised of a titanium compound and an organoaluminum derivative combined in such amounts that the atomic ratio Al/Ti ranges from 6-20;
- (b) polymerizing the monomer reactants in a non-batchwise manner;
- (c) withdrawing polymerized material at a temperature of 150.degree.-250.degree. C. from said polymerization zone and adding from 0.08-0.20 mole of an organic peroxide per gram atom of the sum of the gram atoms of aluminum and titanium in said catalyst, said organic peroxide having a decomposition temperature of 90.degree.-150.degree. C. to said withdrawn polymerization material in order to deactivate the catalyst therein;
- (d) separating the polymer product component of the withdrawn material from any unreacted monomer under superatmospheric pressure, thereby affecting polymer produce recovery; and
- (e) recycling the separated unreacted monomer of step (d) to said polymerization zone.
- 2. The process according to claim 1, in which the organic peroxide is supplied in said deactivation step in the form of the solution thereof in an organic hydrocarbon.
- 3. The process according to claim 1, in which the organic peroxide is supplied in said deactivation step in the form of the solution thereof in an organic hydrocarbon of a concentration of 0.01% to 95% by weight.
- 4. The process according to claim 1, in which the organic peroxide is added to the polymerization product under a pressure of at least 150 atmospheres.
- 5. The process according to claim 1, wherein the pressure within said polymerization reactor during polymerization ranges from 500 to 4000 kg/cm.sup.2.
- 6. The process according to claim 1, wherein said separation step (d) is a two step separation process of a first high pressure separation step conducted at a pressure of 100 to 350 kg/cm.sup.2, followed by a low pressure separator step operated at a pressure of 0 to 5 kg/cm.sup.2.
- 7. The process according to claim 6, wherein said high pressure separator step is conducted at a pressure of 180 to 250 kg/cm.sup.2.
- 8. The process according to claim 1, wherein said organic peroxide is a member selected from the group consisting of a peroxyester, a diacylperoxide, a peroxydicarbonate and mixtures thereof.
- 9. The process according to claim 8, wherein said organic peroxide is di-2-ethylhexylperoxydicarbonate, t-butylperoxypivalate, acetylperoxide, octanoylperoxide, t-butylperoxyisobutyrate, 3,5,5-trimethylhexanoylperoxide or mixtures thereof.
Priority Claims (1)
Number |
Date |
Country |
Kind |
57-108970 |
Jun 1982 |
JPX |
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Parent Case Info
This application is a continuation of application Ser. No. 506,588, filed June 22, 1983, now abandoned.
US Referenced Citations (6)
Continuations (1)
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Number |
Date |
Country |
Parent |
506588 |
Jun 1983 |
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