Method for decomposing polycarbonate
A technology for polycarbonate and decomposition products, which is applied in chemical instruments and methods, methods for chemically changing substances by using atmospheric pressure, and preparation of organic compounds, etc. issues of sex
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Embodiment 1
[0066] Into a tubular reaction tube made of SUS316 with a total volume of 6 mL, 0.11 g of polycarbonate resin pellets (AD-5503 manufactured by Teijin Chemicals Co., Ltd.) were added, 1.1 g of water was added, the pressure was set to 25 MPa, and the tube was sealed. The inside of the reaction tube was replaced with argon to make it an inert gas atmosphere, and then immersed in a sand bath preheated to 400°C for 3 minutes. Here, the ion product Kw under the above conditions = 10 -20 mol 2 / kg 2 , Dielectric constant = 2. Then, the reaction tube was dipped in water and rapidly cooled to room temperature, and the content was taken into a glass bottle. Under the temperature and pressure conditions of 20°C and 0.1 MPa, the content was a colorless and transparent homogeneous aqueous solution without solid components. In addition, gas is generated when taking it out. Then, when the above-mentioned aqueous solution was left to stand for a certain period of time, the precipitation o...
Embodiment 2
[0069] 0.08 g of polycarbonate resin pellets were added to the reaction tube, 0.84 g of water was added, and the pressure was adjusted to 25 MPa, followed by immersion in a sand bath preheated to 420° C., and decomposed in the same manner as in Example 1. Table 1 shows the ion product and dielectric constant under the above conditions. After the reaction, the content was taken into a glass bottle. Under the temperature and pressure conditions of 20° C. and 0.1 MPa, the content was a colorless and transparent homogeneous aqueous solution without solid components. The amount of 2,2-bis(4-hydroxyphenyl)propane contained in the aqueous solution was determined in the same manner as in Example 1, and is shown in Table 1.
Embodiment 3
[0071] 0.06 g of polycarbonate resin pellets were added to the reaction tube, 0.60 g of water was added, and the pressure was adjusted to 20 MPa, and the reaction tube was immersed in a sand bath preheated to 400° C., and decomposed in the same manner as in Example 1. Table 1 shows the ion product and dielectric constant under the above conditions. After the reaction, the content was taken into a glass bottle. Under the temperature and pressure conditions of 20° C. and 0.1 MPa, the content was a colorless and transparent homogeneous aqueous solution without solid components. Table 1 shows the amount of 2,2-bis(4-hydroxyphenyl)propane (bisphenol A) contained in the aqueous solution in the same manner as in Example 1.
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