Device for synthesizing a polymer with reduced formation of deposits in the reaction chamber

Patent metadata

Field	Value
Publication number	US-2016130398-A1
Application number	US-201414897020-A
Country	US
Kind code	A1
Filing date	Jun 11, 2014
Priority date	Jun 12, 2013
Publication date	May 12, 2016
Grant date	—

Abstract

The invention relates to a device for synthesizing a polymer accompanied by separating a gaseous substance. Said device comprises: a reactor chamber ( 1 ) having a substantially circular cylinder-shaped upper section ( 11 ), which is delimited by two circular surfaces ( 111, 112 ) and a circumferential surface ( 113 ) and has a longitudinal cylinder axis, and a lower section ( 12 ), the upper section ( 11 ) and the lower section ( 12 ) being connected to one another via the first circular surface ( 111 ); an inlet opening ( 2 ); a first outlet opening ( 3 ), which is arranged in a wall of the lower section ( 12 ); a second outlet opening ( 4 ), which is arranged in the second circular surface ( 112 ) or in the circumferential surface ( 113 ) between the inlet opening ( 2 ) and the second circular surface ( 112 ); and a removal device ( 51 ), which is arranged so as to be movable along the longitudinal cylinder axis at least between the second circular surface ( 112 ) and the inlet opening ( 2 ), and contacts the circumferential surface ( 113 ). The invention further relates to a method comprising: feeding an oligomer melt ( 7 ) into a circular cylinder-shaped first section ( 11 ) of a reaction chamber ( 1 ) through an inlet opening ( 2 ) tangentially to a circumferential surface ( 113 ) of the first section ( 11 ); polymerizing the oligomer melt ( 7 ) to form a polymer melt ( 8 ); removing the polymer melt ( 8 ) from the reaction chamber ( 1 ) through a first outlet opening ( 3 ) of the reaction chamber ( 1 ); and removing a gaseous substance ( 9 ) from the reaction chamber ( 1 ) through a second outlet opening ( 4 ) of the reaction chamber ( 1 ) above the inlet opening ( 2 ). Deposits on at least one inner wall of the first section ( 11 ) of the reaction chamber ( 1 ) above the inlet opening ( 2 ) are removed by a removal device ( 51 ).

First claim

1 . A continuous process for synthesizing a polymer with separation of a gaseous substance in an apparatus comprising
a reaction space ( 1 ) comprising an essentially circular cylindrical upper section ( 11 ) which is delimited by two circular faces ( 111 , 112 ) and one shell face ( 113 ) and has a longitudinal cylinder axis, and a lower section ( 12 ), the upper section ( 11 ) and the lower section ( 12 ) being joined to one another via the first circular face ( 111 ), an inlet orifice ( 2 ) disposed within the shell face ( 113 ) such that tangential introduction of a liquid through the inlet orifice ( 2 ) along the shell face ( 113 ) into the upper section ( 11 ) is enabled, a first outlet orifice ( 3 ) disposed in a wall of the lower section ( 12 ), a second outlet orifice ( 4 ) disposed in the second circular face ( 112 ) or in the shell face ( 113 ) between the inlet orifice ( 2 ) and the second circular face ( 112 ), and at least one first removal device ( 51 ) disposed so as to be movable along the longitudinal cylinder axis at least between the second circular face ( 112 ) and the inlet orifice ( 2 ) and is in contact with the shell face ( 113 ), having the following process steps: a) feeding a prepolymer melt ( 7 ) into a circular cylindrical first section ( 11 ) of a reaction space ( 1 ) through an inlet orifice ( 2 ) tangentially to a shell face ( 113 ) of the first section ( 11 ), b) polymerizing the prepolymer melt ( 7 ) to give a polymer melt ( 8 ), c) removing the polymer melt ( 8 ) from the reaction space ( 1 ) through a first outlet orifice ( 3 ) of the reaction space ( 1 ), and d) removing a gaseous substance ( 9 ) from the reaction space ( 1 ) through a second outlet orifice ( 4 ) of the reaction space ( 1 ) above the inlet orifice ( 2 ), wherein deposits on at least one inner wall of the upper section ( 11 ) of the reaction space ( 1 ) above the inlet orifice ( 2 ) are removed by at least the first removal device ( 51 ).

2 . The process according to claim 1 , wherein the first removal device ( 51 ) is rotated about the longitudinal cylinder axis of the first section ( 11 ).

3 . The process according to claim 1 , wherein the inlet orifice ( 2 ) is connected by means of an inlet line ( 21 ) to the second circular face ( 112 ) of the upper section ( 11 ), the first removal device ( 51 ) having an orifice through which the inlet line ( 21 ) is conducted.

4 . The process according to claim 1 , wherein the second outlet orifice ( 4 ) is connected to an outlet line ( 41 ) in which there is disposed a second removal device ( 52 ) which is disposed so as to be movable along the outlet line ( 41 ) and is in contact with the inner face of the outlet line ( 41 ).

5 . The process according to claim 1 , wherein a cross section of the lower section ( 12 ) decreases from the upper section ( 11 ) toward the first outlet orifice ( 3 ).

6 . The process according to claim 1 , wherein the speed with which the polymer melt ( 8 ) moves toward the first outlet orifice ( 3 ) rises with falling distance from the first outlet orifice ( 3 ).

7 . The process according to claim 6 , wherein the polymer melt ( 8 ) is transported by means of a transport apparatus ( 6 ) to the first outlet orifice ( 3 ).

8 . The process according to claim 1 , wherein the polymer comprises a thermoplastic polymer.

9 . The process according to claim 1 , wherein the polymer is a polyamide and the gaseous substance is steam.

10 . The process according to claim 1 , wherein the polymer is a semiaromatic polyamide comprising at least one repeat unit having an aromatic group and at least one repeat unit having an aliphatic or cycloaliphatic group in incorporated form.

11 . The process according to claim 8 wherein the polymer is a polyamide selected from the group consisting of PA 6.T, PA 9.T, PA8.T, PA 10.T, PA 12.T, PA 6.I, PA 8.I, PA 9.I, PA 10.I, PA 12.I, PA 6.T/6, PA 6.T/10, PA 6.T/12, PA 6.T/6.I, PA6.T/8.T, PA 6.T/9.T, PA 6.T/10T, PA 6.T/12.T, PA 12.T/6.T, PA 6.T/6.I/6, PA 6.T/6.I/12, PA 6.T/6.I/6.10, PA 6.T/6.I/6.12, PA 6.T/6.6, PA 6.T/6.10, PA 6.T/6.12, PA 10.T/6, PA 10.T/11, PA 10.T/12, PA 8.T/6.T, PA 8.T/66, PA 8.T/8.I, PA 8.T/8.6, PA 8.T/6.I, PA 10.T/6.T, PA 10.T/6.6, PA 10.T/10.I, PA 10T/10.I/6.T, PA 10.T/6.I, PA 4.T/4.I/46, PA 4.T/4.I/6.6, PA 5.T/5.I, PA 5.T/5.I/5.6, PA 5.T/5.I/6.6, PA 6.T/6.I/6.6, PA MXDA.6, PA IPDA.I, PA IPDA.T, PA MACM.I, PA MACM.T, PA PACM.I, PA PACM.T, PA MXDA.I, PA MXDA.T, PA 6.T/IPDA.T, PA 6.T/MACM.T, PA 6.T/PACM.T, PA 6.T/MXDA.T, PA 6.T/6.I/8.T/8.I, PA 6.T/6.I/10.T/10.I, PA 6.T/6.I/IPDA.T/IPDA.I, PA 6.T/6.I/MXDA.T/MXDA.I, PA 6.T/6.I/MACM.T/MACM.I, PA 6.T/6.I/PACM.T/PACM.I, PA 6.T/10.T/IPDA.T, PA 6.T/12.T/IPDA.T, PA 6.T/10.T/PACM.T, PA 6.T/12.T/PACM.T, PA 10.T/IPDA.T, PA 12.T/IPDA.T and copolymers and mixtures thereof.

12 . The process according to claim 8 , wherein the polymer is selected from the group consisting of polyamides, thermoplastic polyurethanes, polyolefins, vinylaromatic polymers, polyesters, polyacetals, polycarbonates, polysulfones, polyether sulfones and mixtures thereof.

13 . The process according to claim 2 , wherein the polymer is a polyamide and the gaseous substance is steam.

14 . The process according to claim 2 , wherein the polymer is a semiaromatic polyamide comprising at least one repeat unit having an aromatic group and at least one repeat unit having an aliphatic or cycloaliphatic group in incorporated form.

15 . The process according to claim 6 , wherein the polymer comprises a thermoplastic polymer.

16 . The process according to claim 6 , wherein the polymer is a polyamide and the gaseous substance is steam.

17 . The process according to claim 6 , wherein the polymer is a semiaromatic polyamide comprising at least one repeat unit having an aromatic group and at least one repeat unit having an aliphatic or cycloaliphatic group in incorporated form.

18 . The process according to claim 7 , wherein the polymer comprises a thermoplastic polymer.

19 . The process according to claim 7 , wherein the polymer is a polyamide and the gaseous substance is steam.

20 . The process according to claim 7 , wherein the polymer is a semiaromatic polyamide comprising at least one repeat unit having an aromatic group and at least one repeat unit having an aliphatic or cycloaliphatic group in incorporated form.

Assignees

• Basf Se

Inventors

• Zhu Ning
• Stammer Achim
• Clauss Joachim
• Witt Uwe
• Kory Gad
• Biedasek Silke

Classifications

• B01J19/20

  in the form of helices, e.g. screw reactors · CPC title

• C08G69/04

  Preparatory processes · CPC title

• C08F2/002

  Scale prevention in a polymerisation reactor or its auxiliary parts · CPC title

• C08F2/005

  by addition of a scale inhibitor to the polymerisation medium · CPC title

• C08L77/06

  Polyamides derived from polyamines and polycarboxylic acids (C08L77/10 takes precedence) · CPC title