Preparation method of high-quality spinning pitch, product and application of high-quality spinning pitch
A high-quality, spinning technology, used in textiles and papermaking, fiber chemical characteristics, etc., can solve the problems of severe reaction conditions, low yield, low product purity, etc., and achieve mild reaction conditions, high safety factor, and high reactivity. Effect
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Embodiment 1
[0044] Add 300mL of toluene, 14.38g of liquid bromine, and 21.33g of 1-methylnaphthalene (the molar ratio of 1-methylnaphthalene to the brominating agent is 1.7:1) in a 500mL three-necked flask in sequence. Nitrogen was used as a protective atmosphere, and the nitrogen flow rate was 50 mL / min. The reactants were placed in a constant temperature water bath at 50° C. to preheat them, and magnetic stirring was used to ensure that the reactants were evenly mixed. When the temperature of the reaction material rises to 50° C., continue to maintain the magnetic stirring state, and turn on the xenon lamp (300w) to carry out the photocatalytic reaction for 6 hours. After the reaction is completed, the product is suction filtered, washed with water, distilled under reduced pressure, and dried to obtain 1-bromomethylnaphthalene. The yield and selectivity of 1-bromomethylnaphthalene were measured by GC-MS, and the results showed that the yield of 1-bromomethylnaphthalene could reach 94%, ...
Embodiment 2
[0047] Add 300mL of benzene, 14.38g of liquid bromine, and 21.33g of 1-methylnaphthalene (the molar ratio of 1-methylnaphthalene to the brominating agent is 1.7:1) into a 500mL three-necked flask in sequence. Nitrogen was used as a protective atmosphere, and the nitrogen flow rate was 50 mL / min. The reactants were placed in a constant temperature water bath at 50° C. to preheat them, and magnetic stirring was used to ensure that the reactants were evenly mixed. When the temperature of the reaction material rises to 50° C., continue to maintain the magnetic stirring state, and turn on the xenon lamp (300w) to carry out the photocatalytic reaction for 5 hours. After the reaction is completed, the product is suction filtered, washed with water, distilled under reduced pressure, and dried to obtain 1-bromomethylnaphthalene. The yield and selectivity of 1-bromomethylnaphthalene were measured by GC-MS, and the results showed that the yield of 1-bromomethylnaphthalene could reach 96%...
Embodiment 3
[0050] Add 300mL of carbon tetrachloride, 12.53g of boron tribromide, and 21.33g of 2-methylnaphthalene (the molar ratio of 2-methylnaphthalene to brominating agent is 3:1) in sequence in a 500mL three-necked flask. Nitrogen gas was introduced into the reaction system as a protective atmosphere, and the flow rate of nitrogen gas was 75mL / min. The reactant was placed in a constant temperature water bath at 60°C to preheat it, and magnetic stirring was used to ensure that the reaction material was evenly mixed. When the temperature of the reaction material rises to 60° C., continue to maintain the state of magnetic stirring, and turn on the xenon lamp (300w) to carry out the photocatalytic reaction for 4 hours. After the reaction is completed, the product is suction filtered, washed with water, distilled under reduced pressure, and dried to obtain 2-bromomethylnaphthalene. The yield and selectivity of 2-bromomethylnaphthalene were determined by GC-MS, and the results showed that...
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