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Method for preparing polycarbonate with continuous two-phase interface phosgene method

A polycarbonate and phase interface technology, which is applied in the field of continuous two-phase interface phosgene preparation of polycarbonate, can solve the problems of large consumption of phosgene and lye, complicated process, and increased difficulty of the preparation process, so as to reduce unit consumption , Simplify the process control steps, reduce the effect of phosgene alkaline hydrolysis rate and the amount of lye added

Active Publication Date: 2011-04-27
WANHUA CHEM GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

The phosgene organic phase and the phenoxide salt phase are mixed by a static mixer and then quickly entered into a continuous stirring full-mixed tank reactor, and the excess ratio of phosgene is reduced to 10.2~ 14%, but the process is complicated, and in order to control the end group equivalent ratio of the oligomer emulsion in the fully mixed tank, the molar equivalent ratio of the alkali metal hydroxide introduced in the photochemical reaction stage to the functional group of bisphenol has reached 1.1 ~1.5
[0010] In summary, in order to ensure the molecular weight of the final product in the existing two-step process for preparing polycarbonate by interfacial phosgene method, it is necessary to strictly control the chloroformate end in the polycarbonate oligomer emulsion in the photochemical reaction stage. The equivalent ratio of phosgene and phenolic oxyanion terminal groups is slightly higher than 1, so it is necessary to control the main reaction of phosgene and bisphenol in the photochemical reaction stage, which not only increases the difficulty of the preparation process, but also causes photochemical reaction. Large consumption of gas and lye

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  • Method for preparing polycarbonate with continuous two-phase interface phosgene method

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Experimental program
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Embodiment 1

[0049] Add 1,801g of bisphenol A, 9,558g of water, and 660g of sodium hydroxide to a mixing tank, mix and dissolve to form a sodium phenoxide brine phase; add 850g of liquid phosgene and 13,203g of dichloromethane to another mixing tank, and mix to form an organic phase. The sodium phenolate brine phase and the organic phase, which accounted for 99% of the total amount of the bisphenol A sodium brine phase, were injected into the photochemical reactor composed of a static mixer at a flow rate of 397g / min and 468g / min, and entered after staying for 1.5min. Also in the coupling reactor that is made of static mixer, in the reactor, inject the sodium phenate brine phase of remainder, concentration simultaneously and be the end-capping agent of 5wt%, described end-capping agent is p-tert-butylphenol Dichloromethane solution, concentration are the catalyzer of 1.5wt%, and described catalyzer is the dichloromethane solution of triethylamine and the sodium hydroxide solution that conce...

Embodiment 2

[0051] Add 1,802g of bisphenol A, 9,560g of water, and 660g of sodium hydroxide to a mixing tank, mix and dissolve to form a sodium phenoxide brine phase; add 850g of liquid phosgene and 13,205g of dichloromethane to another mixing tank, and mix to form an organic phase. The sodium phenolate brine phase and the organic phase, which account for 99.5% of the total amount of the bisphenol A sodium brine phase, are injected into the photochemical reactor composed of a static mixer at a flow rate of 399g / min and 468g / min, and enter after staying for 1.5min. In the coupling reactor that is also constituted by a static mixer, inject the remaining amount of sodium phenolate salt phase, 5% mass fraction of end-capping agent p-tert-butylphenol / dichloromethane solution, 1.5% mass fraction into the reactor simultaneously. Fractions of catalyst triethylamine / dichloromethane solution and 30% mass fraction of sodium hydroxide solution, the flow rates of the four are 2g / min, 12.8g / min, 7g / min,...

Embodiment 3

[0053]Add 1,802g of bisphenol A, 9,559g of water, and 660g of sodium hydroxide to a mixing tank, mix and dissolve to form a sodium phenoxide brine phase; add 849g of liquid phosgene and 13,202g of dichloromethane to another mixing tank, and mix to form an organic phase. The sodium phenolate brine phase and the organic phase, which accounted for 95% of the total amount of the bisphenol A sodium brine phase, were injected into the photochemical reactor composed of a static mixer at a flow rate of 381g / min and 468g / min, and entered after staying for 1.5min. In the coupling reactor that is also constituted by a static mixer, inject the remaining amount of sodium phenolate salt phase, 5% mass fraction of end-capping agent p-tert-butylphenol / dichloromethane solution, 1.5% mass fraction into the reactor simultaneously. Fractions of catalyst triethylamine / dichloromethane solution and 30% mass fraction of sodium hydroxide solution, the flow rates of the four are 20g / min, 12.8g / min, 7g / m...

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Abstract

The invention relates to a novel method for preparing polycarbonate with a continuous two-phase interface phosgene method, comprising the following steps: carrying out photochemical reaction on alkali metal hydroxide solution and organic phase to prepare polycarbonate oligomer emulsion, wherein bisphenol or polyphenol or mixture of the bisphenol and the polyphenol is dissolved in the alkali metal hydroxide solution, the alkali metal hydroxide solution accounts for 95-99.5 percent of the weight in the formula, and the organic phase contains phosgene; and carrying out coupling reaction on the polycarbonate oligomer emulsion and the residual alkali metal hydroxide solution to finally prepare polycarbonate resin. The method for preparing the polycarbonate with the continuous two-phase interface phosgene method is simpler in process than the existing method for preparing the polycarbonate, and the loss of the phosgene and the alkali liquor is reduced effectively.

Description

technical field [0001] The invention relates to a continuous production method of polycarbonate, more specifically to a method for preparing polycarbonate by continuous two-phase interfacial phosgene method. Background technique [0002] Polycarbonate (PC) has outstanding impact resistance, creep resistance, high tensile strength, bending strength, elongation and rigidity, can withstand the explosion of the TV screen, and has high durability Heat and cold resistance, can be used in the range of -100 ℃ ~ 140 ℃, excellent electrical properties, low water absorption, good light transmission, visible light transmittance can reach about 90%, and any coloring can be applied. At present, large-scale industrial production is mainly aromatic polycarbonate, which is the second largest engineering plastic after nylon in the world. It has a wide range of uses in the national economy and has entered automobiles, electronics, construction, office equipment, and packaging. , sports equipm...

Claims

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Application Information

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IPC IPC(8): C08G64/24
Inventor 张雷张宏科宋林嵘华卫琦徐超乔石张振威潘勇军胡亦锋杨径靖臧西旺冯凯
Owner WANHUA CHEM GRP
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