Method using cooling crystallization method to increase whiteness of bisphenol AF
A cooling crystallization and bisphenol technology, applied in the field of cooling crystallization to improve the whiteness of bisphenol AF, can solve the problems of yellowing, unsatisfactory whiteness, affecting product quality, etc., and achieve the effect of improving whiteness
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[0024] Example 1
[0025] A cooling crystallization method to improve the whiteness of bisphenol AF includes the following steps:
[0026] 1) 2400 parts by weight of anhydrous methanol, 1200 parts by weight of crude bisphenol AF, and 12 parts by weight of tartaric acid are sequentially added to the reaction kettle, and stirred (the stirring rate is 500 r / min).
[0027] 2) Increase the temperature, control the temperature in the reactor at 65°C, and age for 60 minutes.
[0028] 3) After the crude bisphenol AF is completely dissolved, the temperature is first naturally cooled to 52°C to produce crystals, and the crystals are cultivated for 30 minutes. Open the frozen brine inlet valve of the reactor, and cool to 10°C at a rate of 15°C / h.
[0029] 4) Filter, rinse and dry the obtained crystals. Among them, first rinse the crystals with anhydrous methanol, and then wash the crystals with water.
[0030] 5) Repeat steps 1) to 4) to cool and crystallize once to obtain a finished product. Amo...
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[0031] Example 2
[0032] A cooling crystallization method to improve the whiteness of bisphenol AF includes the following steps:
[0033] 1) Add 2000 parts by weight of anhydrous methanol, 1100 parts by weight of crude bisphenol AF, and 10 parts by weight of tartaric acid in sequence to the reactor, and stir (the stirring rate is 450 r / min).
[0034] 2) Increase the temperature, control the temperature in the reactor at 63°C and age for 70 minutes.
[0035] 3) After the crude bisphenol AF is completely dissolved, the temperature is first naturally cooled to 50°C to produce crystals, and the crystals are cultivated for 35 minutes. Open the frozen brine inlet valve of the reactor and cool to 8°C with a cooling rate of 13°C / h.
[0036] 4) Filter, rinse and dry the obtained crystals. Among them, first rinse the crystals with anhydrous methanol, and then wash the crystals with water.
[0037] 5) Repeat steps 1) to 4) to cool and crystallize once to obtain a finished product. Wherein, in st...
Example Embodiment
[0038] Example 3
[0039] A cooling crystallization method to improve the whiteness of bisphenol AF includes the following steps:
[0040] 1) 2800 parts by weight of anhydrous methanol, 1300 parts by weight of crude bisphenol AF, and 14 parts by weight of tartaric acid are sequentially added to the reactor, and stirred (stirring rate is 550r / min).
[0041] 2) Increase the temperature, control the temperature in the reactor at 67°C, and age for 50 minutes.
[0042] 3) After the crude bisphenol AF is completely dissolved, the temperature is first naturally cooled to 54°C to produce crystals, and the crystals are cultivated for 25 minutes. Open the frozen brine inlet valve of the reactor and cool to 12°C at a cooling rate of 17°C / h.
[0043] 4) Filter, rinse and dry the obtained crystals. Among them, first rinse the crystals with anhydrous methanol, and then wash the crystals with water.
[0044] 5) Repeat steps 1) to 4) to cool and crystallize once to obtain a finished product. Among the...
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