Olefin polymerizer, polyolefin production system, and process for producing polyolefin

Patent metadata

Field	Value
Publication number	US-9592486-B2
Application number	US-201314401029-A
Country	US
Kind code	B2
Filing date	May 1, 2013
Priority date	May 14, 2012
Publication date	Mar 14, 2017
Grant date	Mar 14, 2017

Abstract

An olefin polymerization reactor comprising a tubular portion that extends in a vertical direction; a tapered portion disposed inside the tubular portion, an inside diameter of the tapered portion decreasing downwardly, and including a vertically penetrating orifice at a bottom end thereof; a tubular lower deflector disposed above the orifice of the tapered portion, an outside diameter of the tubular lower deflector increasing downwardly, a bottom end thereof being located away from an inner wall of the tubular portion, and including a vertically penetrating orifice at a top end thereof; and an upper deflector disposed above the orifice of the lower deflector, an outside diameter of the upper deflector increasing downwardly, a top end thereof being closed, a bottom end thereof being located away from the inner wall of the tubular portion, and an outside diameter at the bottom end being equal to or greater than an inside diameter of the orifice of the lower deflector.

First claim

The invention claimed is:

1. An olefin polymerization reactor comprising:
a tubular portion that extends in a vertical direction;
a tapered portion disposed inside the tubular portion, an inside diameter of the tapered portion decreasing downwardly, and comprising a vertically penetrating orifice at a bottom end thereof;
a tubular lower deflector disposed above the orifice of the tapered portion, an outside diameter of the tubular lower deflector increasing downwardly and a bottom end thereof being located away from an inner wall of the tubular portion, and comprising a vertically penetrating orifice at a top end thereof; and
an upper deflector disposed above the orifice of the lower deflector, an outside diameter of the upper deflector increasing downwardly, a top end thereof being closed, a bottom end thereof being located away from the inner wall of the tubular portion, and an outside diameter at the bottom end being equal to or greater than an inside diameter of the orifice of the lower deflector,
wherein the area of the outer surface of the upper deflector is smaller than the area of the outer surface of the lower deflector.

2. The polymerization reactor according to claim 1 , wherein the bottom end of the upper deflector is located below the top end of the lower deflector.

3. The polymerization reactor according to claim 1 , wherein the bottom end of the upper deflector is located above the top end of the lower deflector.

4. The polymerization reactor according to claim 1 , wherein the inside diameter of the orifice of the lower deflector is 0.5 to 2.0 times the inside diameter of the orifice of the tapered portion.

5. The polymerization reactor according to claim 1 , wherein the outside diameter of the upper deflector at the bottom end is equal to or less than 3 times the inside diameter of the orifice of the lower deflector.

6. The polymerization reactor according to claim 1 , wherein the outside diameter of the lower deflector at the bottom end is 0.35 to 0.65 times the inside diameter of the tubular portion.

7. The polymerization reactor according to claim 1 , further comprising a liquid olefin supply section that causes liquid olefin to contact the outer surface of the upper deflector.

8. The polymerization reactor according to claim 1 , comprising a plurality of combinations of the tubular portion, the tapered portion, the lower deflector and the upper deflector.

9. The polymerization reactor according to claim 8 , wherein the plurality of combinations are arranged in the vertical direction.

10. The polymerization reactor according to claim 8 , further comprising transporting means for transporting polyolefin particles from one of the combinations to another of the combinations.

11. The polymerization reactor according to claim 1 , wherein an angle of inclination formed by the outer surface of the lower deflector with respect to a horizontal plane is greater than an angle of repose of polyolefin particles in the cylinder.

12. The polymerization reactor according to claim 1 , wherein an angle of inclination formed by the outer surface of the upper deflector with respect to a horizontal plane is greater than an angle of repose of polyolefin particles in the cylinder.

13. The polymerization reactor according to claim 1 , wherein the outer surface of the upper deflector is a conical surface.

14. The polymerization reactor according to claim 1 , wherein the outer surface of the lower deflector forms part of a conical surface.

15. The polymerization reactor according to claim 1 , comprising a straight pipe that extends upward in the vertical direction at the top end of the lower deflector.

16. The polymerization reactor according to claim 1 , comprising a straight pipe that extends downward in the vertical direction at the bottom end of the upper deflector.

17. A process for producing polyolefin in which a spouted bed of polyolefin particles is formed on the tapered portion in the polymerization reactor according to claim 1 to polymerize olefin, wherein the spouted bed is formed such that the whole lower deflector is exposed above the top surface of the spouted bed.

18. A process for producing polyolefin according to claim 17 , further comprising:
a step of continuously supplying olefin to the olefin polymerization reactor, continuously extracting a gas containing unreacted olefin from the olefin polymerization reactor and sending all or part of the extracted gas back to the olefin polymerization reactor;
a step of cooling the whole or part of the extracted gas and obtaining an olefin-containing condensate; and
a step of supplying the condensate to the outer surface of the upper deflector.

19. A polyolefin production system used in the process according to claim 17 , comprising:
an olefin pre-polymerization reactor that polymerizes olefin in the presence of an olefin polymerization catalyst and forms polyolefin particles; and
the olefin polymerization reactor connected downstream of the olefin pre-polymerization reactor.

20. A process for producing polyolefin in which olefin is polymerized using the polyolefin production system according to claim 19 .

Assignees

• Sumitomo Chemical Co

Inventors

• Sato Hideki

Classifications

• C08F2/01

  characterised by special features of the polymerisation apparatus used · CPC title

• C08F110/06

  Propene · CPC title

• C08F10/00

  Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond · CPC title

• B01J8/245 Primary

  Spouted-bed technique · CPC title

• B01J2208/06

  Details of tube reactors containing solid particles · CPC title