Method of preparing alpha-chlorothalonil
A technology of chlorothalonil and configuration, which is applied in botany equipment and methods, biocides, plant growth regulators, etc., and can solve problems such as imperfect detection methods, high energy consumption, and high equipment and operation requirements
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Embodiment 1
[0021] Put 20 grams of chlorothalonil-based materials based on β-type chlorothalonil in a four-necked round-bottomed flask with a volume of 150 ml equipped with a reflux condenser, a stirrer, a thermometer and a sampling port with a ground plug. Inject absolute ethanol into the sampling port. The amount of absolute ethanol injected is just enough to submerge the chlorothalonil material. The flask assembly was placed in a constant temperature bath and heated until a small amount of solvent reflux occurred (reflux temperature about 78° C.), at which point stirring was started and timing was started. Every two hours, stop stirring, open the sampling port, and use a sampler with a semi-fused glass filter plate to take out part of the wet solid phase sample from the bottom of the flask for detection. Return the liquid phase remaining in the sampler when sampling to the flask. After sampling, continue to start stirring. After the wet solid phase sample was dried in a vacuum dryin...
Embodiment 2
[0023] Put 20 grams of chlorothalonil-based materials based on β-type chlorothalonil in a four-necked round-bottomed flask with a volume of 150 ml equipped with a reflux condenser, a stirrer, a thermometer and a sampling port with a ground plug. Inject toluene into the sampling port. The amount of toluene injected is just enough to submerge the chlorothalonil material. The flask assembly was placed in a constant temperature bath and heated until a small amount of solvent reflux occurred (reflux temperature about 111° C.), at which point stirring was started and timing was started. Sampling time and processing method are identical with embodiment one. After the wet solid phase sample was dried in a vacuum drying oven with a maximum temperature of 80° C., the characteristic peak of β-type chlorothalonil was detected by X-ray powder diffraction method (2-theta=26.5±0.1°). The characteristic peak of β-type chlorothalonil in the first sampling has disappeared. No characteristic ...
Embodiment 3 7
[0025] The experimental condition of embodiment three-seven is identical with embodiment one.
[0026] Example number
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