US2017320973A1PendingUtilityA1

Polymerisation process and polymerisation unit comprising a degassing section

Assignee: INEOS EUROPE AGPriority: Feb 26, 2014Filed: Jul 26, 2017Published: Nov 9, 2017

Est. expiryFeb 26, 2034(~7.6 yrs left)· nominal 20-yr term from priority

Inventors:Jean-Louis Chamayou Luc Girardot Pierre Mangin Kevin Peter Ramsay

C08L 23/025C08F 6/005B01J 2219/24C08F 6/10B01D 19/00C08F 6/00B01D 19/0063B01J 19/24B01D 19/0005C08F 210/14

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Abstract

The present invention relates to processes and apparatus useful for the production of polymer powder, and in particular to processes and apparatus for the degassing of polymer powder.

Claims

exact text as granted — not AI-modified

1 - 11 . (canceled) 
     
     
         12 . Polymerisation unit for producing polymer powder comprising
 at least one polymerisation reactor for the polymerisation of monomer and at least one comonomer   and a degassing section comprising a first cylindrical degassing vessel (V1) in which light (co)monomer(s) are degassed and a second cylindrical degassing vessel (V2) provided in series with the first cylindrical degassing vessel (V1),   
       wherein vessel V1 and vessel V2 are each connected to a vent recovery unit, and further wherein the cross-sectional area (S2) of the second degassing vessel is greater than 1.5 times the cross-sectional area (S1) of the first degassing vessel [S2&gt;1.5×S1]. 
     
     
         13 . Polymerisation unit according to  claim 12  wherein there is provided a third cylindrical degassing vessel in series (V3) in which the active polymer powder is polished and/or deactivated. 
     
     
         14 . Polymerisation unit according to  claim 12  wherein the cross-sectional area (S2) of the second degassing vessel is greater than 2 times the cross-sectional area (S1) of the first degassing vessel [S2&gt;2×S1]. 
     
     
         15 . Polymerisation unit according to  claim 12  wherein the cross-sectional area (S2) of the second degassing vessel is smaller than 10 times the cross-sectional area (S1) of the first degassing vessel [S2&lt;10×S1]. 
     
     
         16 . Polymerisation unit according to  claim 12  wherein the ratio between [the ratio between the height (H2) and the diameter (D2) of the second degassing vessel] and [the ratio between the height (H1) and the diameter (D1) of the first degassing vessel] is lower than 1, i.e. [(H2/D2)/(H1/D1)]&lt;1. 
     
     
         17 . Polymerisation unit according to  claim 12  wherein the ratio between [the ratio between the height (H2) and the diameter (D2) of the second degassing vessel] and [the ratio between the height (H1) and the diameter (D1) of the first degassing vessel] is higher than 0.3, i.e. [(H2/D2)/(H1/D1)]&gt;0.3. 
     
     
         18 . Polymerisation unit according to  claim 12  wherein vessel V2 is used as a surge silo for polymer powders which do not contain heavy comonomer(s). 
     
     
         19 . Polymerisation unit according to  claim 12  wherein vessel V1 and vessel V2 are connected to vent recovery units VR1 and VR2 respectively, and VR1 and VR2 each comprise a compression, a refrigeration and a separation stage which allow separating the vent gas exiting the degasser into a gas/liquid stream. 
     
     
         20 . Polymerisation unit according to  claim 12  wherein vessel V1 and vessel V2 are connected to vent recovery units VR1 and VR2 respectively, wherein VR1 and VR2 include compression stages, and wherein the pressure—after the compression stage—of VR2 is lower than the pressure—after the compression stage—of VR1 (pVR2&lt;pVR1). 
     
     
         21 . Polymerisation unit according to  claim 14  wherein the cross-sectional area (S2) of the second degassing vessel is greater than than 2.5 times the cross-sectional area (S1) of the first degassing vessel [S2&gt;2.5×S1]. 
     
     
         22 . Polymerisation unit according to  claim 21  wherein the cross-sectional area (S2) of the second degassing vessel is greater than than 3 times the cross-sectional area (S1) of the first degassing vessel [S2&gt;3×S1]. 
     
     
         23 . Polymerisation unit according to  claim 15  wherein the cross-sectional area (S2) of the second degassing vessel is less than 8 times the cross-sectional area (S1) [S2&lt;8×S1]. 
     
     
         24 . Polymerisation unit according to  claim 16  wherein the ratio between [the ratio between the height (H2) and the diameter (D2) of the second degassing vessel] and [the ratio between the height (H1) and the diameter (D1) of the first degassing vessel] is lower than 0.8. 
     
     
         25 . Polymerisation unit according to  claim 24  wherein the ratio between [the ratio between the height (H2) and the diameter (D2) of the second degassing vessel] and [the ratio between the height (H1) and the diameter (D1) of the first degassing vessel] is lower than 0.7. 
     
     
         26 . Polymerisation unit according to  claim 12  wherein the ratio between [the ratio between the height (H2) and the diameter (D2) of the second degassing vessel] and [the ratio between the height (H1) and the diameter (D1) of the first degassing vessel] is higher than 0.4. 
     
     
         27 . Polymerisation unit according to  claim 20  wherein pVR2&lt;0.5 pVR1. 
     
     
         28 . Polymerisation unit according to  claim 27  wherein pVR2&lt;0.2 pVR1.

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