Process for preparing polyarylene ether ketone
View Patent ↗A process for preparing a polyarylene ether ketone, comprising: a) reacting an aromatic dihalogen compound with a bisphenol and/or a halophenol in the presence of alkali metal carbonate and/or alkaline earth metal carbonate in a high-boiling aprotic solvent to give a polyarylene ether ketone, b) wet-comminuting the solidified reaction mixture in the presence of water, c) washing with an organic solvent, d) washing with water and e) drying the washed product, wherein the wet-comminuted reaction mixture is fed to the two-stage washing with a residual moisture content of at least 1% by weight, which process leads to distinctly reduced residual contents of salts and reaction solvents.
1. A process for preparing a polyarylene ether ketone, comprising:
a) reacting an aromatic dihalogen compound with a bisphenol and/or a halophenol in the presence of alkali metal carbonate and/or alkaline earth metal carbonate in a high-boiling aprotic solvent to give a polyarylene ether ketone,
b) wet-comminuting the solidified reaction mixture of step a) in the presence of water, to obtain a wet-comminuted reaction mixture;
c) washing the wet-comminuted reaction mixture of step b) with an organic solvent, to obtain a product,
d) washing the product of step c) with water, to obtain a washed product, and
e) drying the washed product,
c) and d) being referred to as two-stage washing, wherein steps b), c) and d) are performed in this order,
wherein the wet-comminuted reaction mixture is fed to the two-stage washing with a residual moisture content of 1 to 12% by weight; and
wherein the polyarylene ether ketone has a Na content of at most 15 ppm, a K content of <1 ppm, and a S content of at most 180 ppm.
2. A process according to claim 1 , wherein the high-boiling aprotic solvent comprises diphenyl sulfone.
3. A process according to claim 1 , wherein the polyarylene ether ketone is a PEEK, a PEK, a PEKK or a PEEKK.
4. A process according to claim 2 , wherein the polyarylene ether ketone is a PEEK, a PEK, a PEKK or a PEEKK.
5. A process according to claim 1 , wherein the water wash includes a wash with a dilute acid.
6. A process according to claim 2 , wherein the water wash includes a wash with a dilute acid.
7. A process according to claim 3 , wherein the water wash includes a wash with a dilute acid.
8. A process according to claim 4 , wherein the water wash includes a wash with a dilute acid.
9. A process according to claim 5 , wherein the acid is selected from the group of hydrochloric acid, sulfuric acid, orthophosphoric acid, pyrophosphoric acid, polyphosphoric acid, metaphosphoric acid and phosphonic acid.
10. A process according to claim 6 , wherein the acid is selected from the group of hydrochloric acid, sulfuric acid, orthophosphoric acid, pyrophosphoric acid, polyphosphoric acid, metaphosphoric acid and phosphonic acid.
11. A process according to claim 7 , wherein the acid is selected from the group of hydrochloric acid, sulfuric acid, orthophosphoric acid, pyrophosphoric acid, polyphosphoric acid, metaphosphoric acid and phosphonic acid.
12. A process according to claim 8 , wherein the acid is selected from the group of hydrochloric acid, sulfuric acid, orthophosphoric acid, pyrophosphoric acid, polyphosphoric acid, metaphosphoric acid and phosphonic acid.
13. A process according to claim 1 , wherein the residual moisture content is at least 2% by weight.
14. A process according to claim 1 , wherein the residual moisture content is at least 3% by weight.
15. A process according to claim 1 , wherein the residual moisture content is at least 4% by weight.
16. A process according to claim 1 , wherein the residual moisture content is at most 10% by weight.
17. A process according to claim 1 , wherein the residual moisture content is 2 to 10% by weight.