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US 2025/0145765 A1Published application
Process and apparatus for the purification of polyetherketoneketone
AssigneeGharda Chemicals Limited
InventorsPrakash D. TRIVEDI, Shrikant A. MAHAJAN, Hemant Y. PARDESHI, Atulkumar R. RAJA
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Abstract
The present disclosure relates to a process and an apparatus for the purification of polyetherketoneketone (PEKK). The process involves purifying the PEKK by using a solvent with continuous reflux to obtain the purified PEKK with enhanced product characteristics. The process of the present disclosure is simple, and economical, reduces the solvent usage and time for purification, and produces purified PEKK with comparatively high yield and purity.
Claims20
A process for purifying polyetherketoneketone (PEKK), said process comprising the following steps:
- a. mixing PEKK containing impurities with a solvent in a solvent collection vessel (100);
- b. stirring said PEKK and said solvent at a predetermined rpm to obtain a slurry mixture;
- c. heating said slurry mixture at a first predetermined temperature to leach the impurities present in PEKK into solvent;
- d. separately loading said solvent in a solvent vaporization vessel (200);
- e. heating said solvent in the solvent vaporization vessel (200) at a second predetermined temperature to vaporize the solvent in said solvent vaporization vessel (200);
- f. leading the solvent vapours from said solvent vaporization vessel (200) to a first condenser to condense said solvent vapours into the solvent collection vessel (100) and ensuring the level of the solvent in solvent collection vessel (100) is always above the level of said slurry mixture;
- g. filtering said slurry mixture in the solvent collection vessel (100) to allow solvent loaded with impurities formed in the solvent collection vessel (100) to flow into the solvent vaporization vessel (200);
- h. circulating said solvent repeatedly between said solvent collection vessel (100) and said solvent vaporization vessel (200);
- i. drawing samples periodically of the solvent flowing into said solvent vaporization vessel (200) until the solvent flowing from the solvent collection vessel (100) to the solvent vaporization vessel (200) contains impurities below a set threshold;
- j. obtaining wet purified PEKK from the solvent collection vessel (100) which has impurities below the said set threshold;
- and
- k. drying said wet purified PEKK to obtain purified PEKK.
9 more elements
An apparatus to purify polyetherketoneketone (PEKK), said apparatus comprising:
- a. a solvent collection vessel (100) for loading PEKK and a solvent;
- b. a solvent vaporization vessel (200) for receiving the solvent, said solvent vaporization vessel (200) operatively positioned below solvent collection vessel (100);
- c. stirring means for stirring the PEKK and the solvent in the solvent collection vessel (100) at a predetermined rpm to form a slurry mixture;
- d. a first heating means for heating said slurry mixture in said solvent collection vessel (100);
- e. a second heating means for vaporizing said solvent in said solvent vaporization vessel (200);
- f. a first condenser fitted to said solvent collection vessel (100);
- g. a first conduit means connecting said solvent vaporization vessel (200) to said first condenser to permit solvent vapours to flow from said solvent vaporization vessel (200) to said first condenser, and further configured to allow said vapours to condense in said first condenser and flow into said solvent collection vessel (100);
- h. a second condenser fitted to said solvent collection vessel (100) configured to receive residual vapours from said solvent collection vessel (100) and said first condenser and further configured to convert said received residual vapours to condensed solvent and still further configured to allow the converted condensed solvent to flow back into the solvent collection vessel (100);
- i. a filtering arrangement configured at the base of the solvent collection vessel (100) to permit solvent loaded with impurities to flow out of the base of said solvent collection vessel (100);
- j. a second conduit (145) means configured to receive the solvent loaded with impurities flowing out of the base of said solvent collection vessel (100) after passing through said filtering arrangement and transmit said solvent loaded with impurities to said solvent vaporization vessel (200);
- k. a branch formed in said second conduit (145) configured to enable periodic drawing of samples of said solvent loaded with impurities for determining the threshold of impurities present in said drawn sample;
- and
- l. drying means for drying said wet purified PEKK obtained from said solvent collection vessel (100).
10 more elements
Dependencies are inferred from the claim text.