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Refined polycarbonic ester organic solution and process for preparing high purity polycarbonic ester

A technology of polycarbonate and organic solution, applied in the field of manufacturing high-purity polycarbonate, can solve problems such as no record in the present invention, no disclosure, etc.

Active Publication Date: 2005-08-03
IDEMITSU KOSAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, it has not been disclosed under what operating conditions to perform the separation operation with the coagulation separator, and there is no description about the present invention.

Method used

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  • Refined polycarbonic ester organic solution and process for preparing high purity polycarbonic ester
  • Refined polycarbonic ester organic solution and process for preparing high purity polycarbonic ester
  • Refined polycarbonic ester organic solution and process for preparing high purity polycarbonic ester

Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0079] (1) Manufacture of polycarbonate oligomers

[0080] Bisphenol A (BPA) was dissolved in a caustic soda (NaOH) aqueous solution having a concentration of 6% by mass to obtain a BPA-NaOH solution having a concentration of 14.5% by mass. The obtained BPA-NaOH solution was mixed at 40 L / hr, the p-tert-butylphenol (PTBP: molecular weight modifier)-dichloromethane solution with a concentration of 25% by mass at 0.35 L / hr, and the solvent dichloromethane at 18.5 L / hr. The flow rate was immersed in a cooling tank at 20° C., introduced into a tubular reactor with an inner diameter of 6 mm and a length of 30 m, and then blown into phosgene at a flow rate of 3.8 kg / hr. The reaction mixture from the reactor was introduced into a separation tank, and the aqueous phase was separated to obtain an organic phase containing a dichloromethane solution of polycarbonate oligomers.

[0081] The properties of the obtained polycarbonate oligomer were analyzed and the results are shown below. ...

Embodiment 1

[0087]Dichloromethane was added to the reaction mixture containing polycarbonate obtained according to the above-mentioned Production Example 1, and the polycarbonate concentration of the polycarbonate solution on the organic phase side was adjusted to 12% by mass. Dichloromethane solution of polycarbonate (organic phase) and aqueous phase. The water content in the separated organic phase was measured and found to be 7500 ppm by mass. In addition, when the crude polycarbonate before adding dichloromethane was measured by another method to measure the viscosity average molecular weight of the polymer, MV=28700, when analyzing the water phase side, BPA was dissolved at a concentration of 21g / L, and the NaOH concentration was 0.22mol / L.

[0088] The dichloromethane solution (organic phase) containing polycarbonate obtained in this way was mixed at 600 L / hr, and the caustic soda aqueous solution of pH=13 modulated with NaOH was used at 60 L / hr with an in-line mixer (manufactured...

Embodiment 2～11

[0091] Except for changing the flow rate of the polymer solution, the supply amount of the aqueous cleaning solution, the stirring power, and the material of the parts in the coagulation separator as described in Table 1 below, the implementation was carried out according to Example 1. The results are shown in Table 1.

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PUM

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Abstract

The invention is to provide a process for manufacturing a high-purity polycarbonate, comprising: mixing a crude polycarbonate organic solution after completion of the polycondensation reaction by an interfacial polycondensation method which contains water-soluble impurities, with an aqueous washing liquid to form an emulsion; and performing purification using a coalescer. The manufacturing process performs the operation while controlling a draw-out amount of the polycarbonate organic solution whose moisture has been removed and which is drawn out from the coalescer and a discharge amount of the aqueous solution from the coalescer top which contains the impurities along with part of the polycarbonate organic solution, so that the polycarbonate organic solution and the aqueous washing liquid may not form a substantial interface by separating into two phases of the organic phase and the aqueous phase at least in the element section inside the coalescer. By operating as in the above, the manufacturing process produces the purified polycarbonate organic solution stably and produces the high-purity polycarbonate using the purified organic solution.

Description

technical field [0001] The invention relates to a method for preparing refined polycarbonate by washing the crude polycarbonate organic solution containing water-soluble impurities obtained by interfacial polycondensation with aqueous washing liquid, and using the refined polycarbonate organic solution to produce high-purity polycarbonate Methods. In further detail, the present invention relates to mixing aqueous washing liquid washing and crude polycarbonate organic solution containing water-soluble impurities obtained by interfacial polycondensation, emulsifying, and using a coalescer to separate the emulsion into organic phase and For the aqueous phase containing impurities, when the refined polycarbonate organic solution is produced, the coagulation separator is operated under specific operating conditions to prevent the adhesion and accumulation of impurities with intermediate specific gravity on at least part of the coagulation separator, and stabilize A method for effi...

Claims

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Application Information

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IPC IPC(8): C08G64/40
Inventor 久西律行齐藤荣藏
Owner IDEMITSU KOSAN CO LTD
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