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

Patent metadata

Field	Value
Publication number	US-9567438-B2
Application number	US-201514860207-A
Country	US
Kind code	B2
Filing date	Sep 21, 2015
Priority date	Apr 30, 2012
Publication date	Feb 14, 2017
Grant date	Feb 14, 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. A method for separating iodine of at least one di-iodized aromatic compound in accordance with the general formula II
I-A-I   Formula II

(where A represents a bivalent aromatic radical) and/or mixtures thereof from material mixtures comprising iodine and/or the at least one di-iodized aromatic compound in accordance with the general formula II characterized in that
a) a first part of the iodine, the at least one di-iodized aromatic compound in accordance with the general formula II, and/or the mixture thereof is/are separated at a pressure which is equal to or larger than the pressure which is present at the triple point of iodine; and
b) a second part of the iodine, the di-iodized aromatic compound in accordance with the general formula II, and/or the mixture thereof is/are separated at a pressure which is smaller than the pressure which is present at the triple point of iodine; wherein in both steps a) and b) the material mixture respectively has temperatures at which at least iodine is present in a gaseous state at the said pressures.

2. The method in accordance with claim 1 , wherein the material mixture includes polyarylene sulfides including at least one repeat unit in accordance with the general formula I
A-S   Formula I

(where A represents a bivalent aromatic radical) and/or includes prepolymers thereof.

3. The method in accordance with claim 1 , wherein the separation is brought about by means of a condensation polymerization reaction in which a compound in accordance with formula II is transformed into a polyarylene sulfide in accordance with the general formula I using a sulfidation agent.

4. The method in accordance with claim 3 , wherein the condensation polymerization is carried out in two steps, wherein
a) in a first step the compound in accordance with the general formula II is brought to a reaction using a sulfidation agent and a prepolymer of the polyarylene sulfide of the general formula I is produced by condensation polymerization; and
b) in a second step subsequent to the first step a condensation polymerization of the prepolymer is carried out,
wherein the separation from the first step takes place at pressures ≧126 mbar (absolute pressure) and from the second step takes place at pressures of <126 mbar (absolute pressure).

5. The method in accordance with claim 1 , wherein
a) the first separated part is supplied to a distillation stage and/or condensation stage and the iodine is liquefied; and
b) the second part is supplied to a desublimation step and the iodine is desublimated.

6. The method in accordance with claim 1 , wherein the separation of the first part takes place at
a) temperatures of the material mixture of 250 to 320° C.; and/or
b) at pressures of ≧126 to 1200 mbar (absolute pressure).

7. The method in accordance with claim 1 , wherein the separation of the second part takes place at
a) temperatures of the material mixture of 285 to 320° C.; and/or
b) at pressures of 0.01 to <126 mbar (absolute pressure).

8. The method in accordance with claim 3 , wherein
a) the bivalent aromatic radical A is selected from the group comprising ortho radicals, meta radicals or paraphenyl radicals, biphenyl radicals, in particular p-p′-biphenyl radicals, diphenylether radicals, in particular p-p′-diphenylether radicals, naphthyl radicals and/or benzophenone radicals; and/or
b) the sulfidation agent is selected from the group comprising sulfur and/or alkali sulfides.

9. The method in accordance with claim 6 , wherein the separation of the first part takes place at temperatures of the material mixture of 260 to 285° C.

10. The method in accordance with claim 6 , wherein the separation of the first part takes place at pressures of ≧126 to 500 mbar (absolute pressure).

11. The method in accordance with claim 6 , wherein the separation of the first part takes place at pressures of 130 to 335 mbar (absolute pressure).

12. The method in accordance with claim 7 , wherein the separation of the second part takes place at temperatures of the material mixture of 290 to 300° C.

13. The method in accordance with claim 7 , wherein the separation of the second part takes place at pressures of 0.1 to 50 mbar (absolute pressure).

14. The method in accordance with claim 7 , wherein the separation of the second part takes place at pressures of 0.2 to 10 mbar (absolute pressure).

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

• C08G75/0263

  using elemental sulfur · CPC title

• B01J19/24

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

• B01J19/245

  placed in series · CPC title

• B01J2219/24

  Stationary reactors without moving elements inside · CPC title

• C08G75/0209

  derived from monomers containing one aromatic ring · CPC title