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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

Active Publication Date: 2018-01-23
浙江希尔化工股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the bisphenol AF that makes in the prior art, generally turns yellow, and whiteness is not ideal enough, has influenced product quality

Method used

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  • Method using cooling crystallization method to increase whiteness of bisphenol AF

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Experimental program
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Effect test

Embodiment 1

[0025] A kind of cooling crystallization method improves the method for bisphenol AF whiteness, comprises the following steps:

[0026] 1) Add 2400 parts by weight of anhydrous methanol, 1200 parts by weight of crude bisphenol AF and 12 parts by weight of tartaric acid to the reactor in sequence, and stir (stirring speed is 500 r / min).

[0027] 2) Raise the temperature, control the temperature in the reactor at 65°C, and age for 60 minutes.

[0028] 3) After the bisphenol AF crude product is completely dissolved, the temperature is naturally lowered to 52°C to produce crystals, and the crystals are grown for 30 minutes. Then, the frozen brine inlet valve of the reactor is opened and the temperature is lowered to 10°C at a cooling rate of 15°C / h.

[0029] 4) The obtained crystals are filtered, rinsed and dried. Wherein, the crystals are rinsed with anhydrous methanol first, and then washed with water.

[0030] 5) Repeat step 1) to step 4) cooling and crystallizing once to obt...

Embodiment 2

[0032] A kind of cooling crystallization method improves the method for bisphenol AF whiteness, comprises 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 to the reactor in sequence, and stir (stirring speed is 450 r / min).

[0034] 2) Raise the temperature, control the temperature in the reactor at 63° C., and age for 70 minutes.

[0035] 3) After the bisphenol AF crude product is completely dissolved, the temperature is naturally lowered to 50°C to produce crystals, and the crystals are grown for 35 minutes, then the frozen brine inlet valve of the reactor is opened, and the temperature is lowered to 8°C at a cooling rate of 13°C / h.

[0036] 4) The obtained crystals are filtered, rinsed and dried. Wherein, the crystals are rinsed with anhydrous methanol first, and then washed with water.

[0037] 5) Repeat step 1) to step 4) cooling and crystallizing once to ob...

Embodiment 3

[0039] A kind of cooling crystallization method improves the method for bisphenol AF whiteness, comprises the following steps:

[0040] 1) Add 2800 parts by weight of anhydrous methanol, 1300 parts by weight of crude bisphenol AF and 14 parts by weight of tartaric acid to the reactor in sequence, and stir (stirring speed is 550 r / min).

[0041] 2) Raise the temperature, control the temperature in the reactor at 67° C., and age for 50 minutes.

[0042] 3) After the bisphenol AF crude product is completely dissolved, the temperature is naturally lowered to 54°C to produce crystals, and the crystals are grown for 25 minutes. Open the frozen brine inlet valve of the reactor and cool down to 12°C at a cooling rate of 17°C / h.

[0043] 4) The obtained crystals are filtered, rinsed and dried. Wherein, the crystals are rinsed with anhydrous methanol first, and then washed with water.

[0044] 5) Repeat step 1) to step 4) cooling and crystallizing once to obtain a finished product. W...

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Abstract

The invention relates to the field of chemical industry and discloses a method using a cooling crystallization method to increase the whiteness of bisphenol AF. The method includes the steps of firstly, sequentially adding absolute methanol, crude bisphenol AF and activated clay, activated carbon, hydrogen peroxide or tartaric acid into a reaction kettle, and stirring; secondly, heating, controlling the temperature in the reaction kettle to be at 63-67 DEG C, and aging for 50-70 minutes; thirdly, after the crude bisphenol AF is dissolved completely, naturally cooling to 50-54 DEG C to achievecrystallization, growing the crystals for 25-35 minutes, and cooling to 8-12 DEG C; fourthly, filtering, eluting and drying the obtained crystals; fifthly, repeating the cooling crystallization once to obtain the final product. The method has the advantages that multiple influence factors which are not discovered so far in the prior art and have important influence on the whiteness of the bisphenol AF are discovered, the complete method which is used for increasing the whiteness of the bisphenol AF and based on the influence factors is developed, and experiment results show that the method caneffectively increase the whiteness of the bisphenol AF.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for improving the whiteness of bisphenol AF by cooling crystallization. Background technique [0002] Bisphenol AF is mainly used as a crosslinking agent for fluorine rubber, which can make rubber products have good compression deformation resistance, chemical corrosion resistance and thermal stability. Bisphenol AF can be used as a monomer to synthesize special fluorine-containing polyimide, fluorine-containing polyamide, fluorine-containing polyester, fluorine-containing polycarbonate and other fluorine-containing polymers, which are used as gas separation membranes, dielectric coatings, optical fibers Sheath, photocell substrate, adhesive, etc., widely used in microelectronics, optics, space technology, etc. [0003] At present, there are many preparation methods of bisphenol AF. For example, Chinese patent CN200810243703.1 discloses a preparation method of bisphenol...

Claims

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Application Information

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IPC IPC(8): C07C37/84C07C39/367
Inventor 王建武陈慧华
Owner 浙江希尔化工股份有限公司
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