Method for separating volatile substances from material mixtures and device for producing polyarylene sulfides

Patent metadata

Field	Value
Publication number	US-9670323-B2
Application number	US-201615181098-A
Country	US
Kind code	B2
Filing date	Jun 13, 2016
Priority date	Apr 30, 2012
Publication date	Jun 6, 2017
Grant date	Jun 6, 2017

Abstract

The present invention relates to a method for separating volatile substances, particularly iodine, diiodised aromatic compounds and/or mixtures thereof, from material mixtures containing said compounds. The invention further relates to a device for producing polyarylene sulphides, by means of which volatile substances, particularly iodine and diiodised aromatic compounds, can be separated from the polymers.

First claim

The invention claimed is:

1. An apparatus for producing polyarylene sulfides including at least one repeat unit in accordance with the general formula I

(where A represents a bivalent aromatic radical) produced by condensation polymerization of a di-iodized aromatic compound in accordance with the general formula II
I-A-I   Formula II

using a sulfidation agent, comprising
a) a precondensation stage comprising an agitating tub or a cascade of agitating tubs composed of a plurality of agitating tubs connected one after the other, wherein the agitating tub and/or the first agitating tub of the cascade of agitating tubs has at least one input possibility for the reactants, and has an outlet for the prepolymer, and downstream of the agitating tub or the cascade of agitating tubs further comprising;
b) a condensation polymerization step comprising at least one condensation polymerization reactor or a cascade of a plurality of condensation polymerization reactors connected one after the other, wherein the condensation polymerization reactor and/or the first condensation polymerization reactor of the cascade of a plurality of condensation polymerization reactors has an input possibility for the prepolymers obtained from the first step and has an output possibility for the polycondensate,
wherein the precondensation stage is connected to the condensation polymerization step via a product line,
characterized in that
the agitating tub or at least one agitating tub of the cascade of agitating tubs has at least one drainage possibility for gaseous side products and/or non-reacted reactants;
the condensation polymerization reactor or at least one condensation polymerization reactor of the cascade of condensation polymerization reactors connected one after the other has at least one drainage possibility for gaseous side products and/or non-reacted reactants;
wherein the at least one drainage possibility of the agitating tub or at least one tub of the cascade of agitating tubs opens into a condensation apparatus and/or a distillation column for the separation by distillation of the gaseous side products and/or non-reacted reactants; and
wherein the at least one drainage possibility of the condensation polymerization reactor or at least one condensation polymerization reactor of the cascade of condensation polymerization reactors connected one after the other opens into at least one desublimator, wherein the at least one distillation column is connected downstream of the at least one desublimator, and the distillation column being connected to the at least one desublimator via a line and having a head side drain and a sump side drain.

2. The apparatus in accordance with claim 1 , the distillation column of the at least one drainage possibility of the agitating tub or at least one tub of the cascade of agitating tubs has a feedback of non-reacted reactants into the agitation tub or into the first agitation tub of the cascade of agitation tubs respectively.

3. The apparatus in accordance with claim 1 , wherein the distillation column the at least one drainage possibility of the agitating tub or at least one tub of the cascade of agitating tubs has a drain at the head side, the drain being connected to at least one condenser or desublimator via a supply.

4. The apparatus in accordance with claim 1 , wherein the head side drain
a) opens into a condenser or into the at least one desublimator; or
b) is combined with the product flow stemming from a condenser.

5. The apparatus in accordance with claim 1 , wherein it comprises an apparatus for generating vacuum which
a) is connected to the at least one desublimator via at least one connection line; and/or
b) is connected to at least one condenser or to the at least one desublimator via at least one connection line.

Assignees

• Sk Chemicals Co Ltd

Inventors

• Schaferskupper Clifford
• Hille Thomas
• Jurgens Theodor
• Schumann Andre
• Gierszewski Lars
• Cha Il Hoon
• Kim Sung Gi
• Kim Yoon Cheol

Classifications

• C08G75/0213

  containing elements other than carbon, hydrogen or sulfur · CPC title

• C08G75/0281 Primary

  Recovery or purification · CPC title

• B01J19/24

  Stationary reactors without moving elements inside (B01J19/08, B01J19/26 take precedence; with stationary particles B01J8/02) · CPC title

• C08G75/0209

  derived from monomers containing one aromatic ring · CPC title

• C08G75/0263

  using elemental sulfur · CPC title