Method for continuously recycling solvent-flux for industrially compounding PPTA
A co-solvent and solvent technology, applied in the field of polymer material synthesis, can solve problems such as unfavorable industrialized large-scale production, unrecycled salts, and reduced production efficiency, and achieves a solution that is conducive to popularization and application, improves solvent recovery rate, and protects the environment. Effect
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Embodiment 1
[0024] The method for continuous recovery and utilization of solvent-cosolvent for industrial synthesis of PPTA of the present invention is as follows: store the mother liquor composed of NMP, calcium chloride, water, oligomers, etc. in the storage tank, and store the extraction solvent chloroform in the extraction agent storage tank . The mother liquor that NMP, calcium chloride, water, oligomer etc. are formed with the flow rate (NMP content 30%) of 2410kg / h, extraction agent chloroform are sent into extraction tower with the flow rate of 5231kg / h and carry out extraction treatment with pump respectively; The pump sends the raffinate phase containing a small amount of extractant-calcium chloride aqueous solution into the stripping tower at a flow rate of 1570kg / h. The temperature of the tower kettle is controlled at 80°C. After being treated by the stripping tower, the extractant chloroform is recycled. The stripped water and calcium chloride are partially used as co-solvent...
Embodiment 2
[0026] The method for continuous recovery and utilization of solvent-cosolvent for industrial synthesis of PPTA of the present invention is as follows: store the mother liquor composed of NMP, calcium chloride, water, oligomers, etc. in the storage tank, and store the extraction solvent octane in the extraction agent storage tank middle. The mother liquor composed of NMP, calcium chloride, water, oligomers, etc. is sent to the extraction tower at a flow rate of 2410kg / h (NMP content 30%), and the extractant octane at a flow rate of 6038kg / h to carry out extraction treatment. Use a pump to send the raffinate phase containing a small amount of extractant-calcium chloride aqueous solution into the stripping tower at a flow rate of 1721kg / h. The temperature of the tower bottom is controlled at 130°C. After being treated by the stripping tower, the extractant is recycled. The stripped water and calcium chloride are partially used as co-solvent after being concentrated, and some are...
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