Einzeltreffer — DigiBib

The present invention relates to methods for controlling a process for the production of a polymer by polymerisation of a monomer which process comprises at least one of: maintaining a substantially constant effective flow ratio (EFR), said effective flow ratio being defined as: EFR=(Qcomo−Lcomo)/(Qmono—Lmono) Qcomo and Qmono being, respectively, flow rates of comonomer and monomer to the reactor, Lcomo and Lmono being, respectively losses of comonomer and monomer, and: maintaining a substantially constant effective flow ratio (EFR), said effective flow ratio being defined as: EFR−(Qhyd—Lhyd)/(Qmono—Lmono) Qhyd and Qmono being, respectively, flow rates of hydrogen and monomer reactor, Lhyd and Lmono being, respectively, losses of hydrogen and monomer.

Titel:	METHOD FOR PRODUCTION OF POLYMER
Link:	Zum Volltext
Veröffentlichung:	2015
Medientyp:	Patent
Sonstiges:	Nachgewiesen in: USPTO Patent Applications Sprachen: English Document Number: 20150246989 Publication Date: September 3, 2015 Appl. No: 14/427493 Application Filed: September 24, 2013 Claim: 1-15. (canceled) Claim: 16. A method for controlling a process for the production of a polymer by polymerisation of a monomer and a comonomer which process comprises: maintaining a substantially constant effective flow ratio (EFR), said effective flow ratio being defined as: EFR=(Qcomo−Lcomo)/(Qmono−Lmono) Qcomo and Qmono being, respectively, flow rates of comonomer and monomer to the reactor, Lcomo and Lmono being, respectively, losses of comonomer and monomer. Claim: 17. A method according to claim 16 wherein Qmono and Qcomo are flow rates of fresh monomer and fresh comonomer to the reactor. Claim: 18. A method according to claim 16 wherein Lmono and Lcomo are losses of monomer and comonomer to purges. Claim: 19. A method for controlling a process for the production of a polymer by polymerisation of a monomer which process comprises: maintaining a substantially constant effective flow ratio (EFR), said effective flow ratio being defined as: EFR=(Qhyd−Lhyd)/(Qmono−Lmono) Qhyd and Qmono being, respectively, flow rates of hydrogen and monomer to the reactor, Lhyd and Lmono being, respectively, losses of hydrogen and monomer. Claim: 20. A method according to claim 19 wherein Qmono and Qhyd are flow rates of fresh monomer and fresh hydrogen to the reactor. Claim: 21. A method according to claim 19 wherein Lmono and Lhyd are losses of monomer and hydrogen to purges. Claim: 22. A method according to claim 16 which is applied under both steady-state and non-steady-state conditions. Claim: 23. A method according to claim 19 which is applied under both steady-state and non-steady-state conditions. Claim: 24. A method according to claim 16 which is a method for the start-up or transition of a process for the production of a polymer by polymerisation of a monomer and which process comprises during the start-up or transition: I. maintaining a substantially constant effective flow ratio (EFR), said effective flow ratio being defined as: EFR=(Qcomo−Lcomo)/(Qmono−Lmono) Qcomo and Qmono being, respectively, flow rates of comonomer and monomer to the reactor, Lcomo and Lmono being, respectively, losses of comonomer and monomer. and optionally II. maintaining a substantially constant effective flow ratio (EFR), said effective flow ratio being defined as: EFR=(Qhyd−Lhyd)/(Qmono−Lmono) Qhyd and Qmono being, respectively, flow rates of hydrogen and monomer to the reactor, Lhyd and Lmono being, respectively, losses of hydrogen and monomer. Claim: 25. A method according to claim 19 which is a method for the start-up or transition of a process for the production of a polymer by polymerisation of a monomer and which process comprises during the start-up or transition: I. maintaining a substantially constant effective flow ratio (EFR), said effective flow ratio being defined as: EFR=(Qhyd−Lhyd)/(Qmono−Lmono) Qhyd and Qmono being, respectively, flow rates of hydrogen and monomer to the reactor, Lhyd and Lmono being, respectively, losses of hydrogen and monomer, and optionally. II. maintaining a substantially constant effective flow ratio (EFR), said effective flow ratio being defined as: EFR=(Qcomo−Lcomo)/(Qmono−Lmono) Qcomo and Qmono being, respectively, flow rates of comonomer and monomer to the reactor, Lcomo and Lmono being, respectively, losses of comonomer and monomer. and optionally Claim: 26. A method according to claim 24 which comprises the above control during a start-up and subsequent steady-state operation. Claim: 27. A method according to claim 25 which comprises the above control during a start-up and subsequent steady-state operation. Claim: 28. A method according to claim 24 which comprises the above control during a transition and in preceding and subsequent steady-state operations. Claim: 29. A method according to claim 25 which comprises the above control during a transition and in preceding and subsequent steady-state operations. Claim: 30. A method according to claim 16 which is carried out in a gas phase fluidized-bed reactor. Claim: 31. A method according to claim 19 which is carried out in a gas phase fluidized-bed reactor. Claim: 32. A method according to claim 16 wherein the monomer is ethylene or propylene. Claim: 33. A method according to claim 19 wherein the monomer is ethylene or propylene. Claim: 34. A method according to claim 32 wherein the comonomer is an olefin having 4 to 8 carbon atoms, or ethylene where propylene is the monomer, or an olefin having 4 to 8 carbon atoms, or propylene where ethylene is the monomer. Claim: 35. A method according to claim 16 where the polymerisation process uses a Ziegler-Natta type catalyst, optionally in conjunction with a cocatalyst which is an organometallic compound of a metal from Groups I to III of the Periodic Classification of the Elements. Claim: 36. A method according to claim 19 where the polymerisation process uses a Ziegler-Natta type catalyst, optionally in conjunction with a cocatalyst which is an organometallic compound of a metal from Groups I to III of the Periodic Classification of the Elements. Current International Class: 08

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METHOD FOR PRODUCTION OF POLYMER