Purifying method for bifenthrin
A technology of bifenthrin and a purification method is applied in chemical instruments and methods, preparation of carboxylic acid esters, preparation of organic compounds, etc., can solve problems such as poor operating environment and large loss of organic solvents, and achieves low cost and product purity. High, improve the effect of the working environment
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Embodiment 1
[0022] Add 500 kg of 96.5% bifenthrin crude oil, 1500 kg of water, and 250 kg of cyclohexane into the stirring tank, raise the temperature to 60°C while stirring, and cool down to 40°C after half an hour, and then cool down at 1000°C Cut for 1 hour at rpm. When the temperature dropped to 5°C, the shearing was stopped, the material was filtered out, and dried under floor heating to obtain 476.3 kg of bifenthrin with a content of 98.3%, and the specific gravity was between 0.65 and 0.75. The oil phase is separated and recycled separately.
Embodiment 2
[0023] Example 2 Take 500 kilograms of 91.42% bifenthrin crude oil, filter and stratify in Example 1, then add activated carbon to absorb and remove impurities to make up 1500 kilograms, add 250 kilograms of cyclohexane into the stirring tank and stir to raise the temperature to 70 ° C, half Cool down to 40°C in 1 hour, then cut at 1000 rpm for 1 hour while cooling down, stop shearing when the temperature drops to 5°C, filter and discharge, and dry under floor heating to obtain 450 kg of biphenyl with a content of 98.1% Pyrethrin crystal, the specific gravity is between 0.65 and 0.75.
[0024] Purification method of the present invention and existing purification method purification result comparison are shown in Table 1
[0025] Table 1
[0026] Product purity Whether there is dust in the environment current technology 96.2% Large dust, pollute the environment The method of the invention More than 98% No dust, good working environment
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