A kind of continuous preparation method of pyraclostrobin suspension concentrate
A technology of pyraclostrobin and suspending agent, which is applied in the field of preparation of pyraclostrobin suspending agent, can solve the problems of low utilization rate, and achieve the effect of high utilization rate, low cost and significant progress
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Embodiment 1
[0039] Embodiment 1: Utilize the method preparation of the present invention
[0040] 1: Take 100 grams of commercially available pyraclostrobin, add 5 grams of water, add 200 ml of methanol, heat up to 60 degrees, stir, all pyraclostrobin is dissolved, and slowly (according to the rate of 0.5 degrees per minute, cool down, ) Cool down to 20 degrees, crystals are precipitated, continue to cool down to 0-5 degrees, and keep warm at 0-5 degrees for 4 hours;
[0041] 2: Keep the temperature rising at a rate of 5 degrees per minute to raise the temperature. When the temperature rises to 40 degrees, some of the samples are not dissolved. Continue to cool down, and the cooling rate is maintained at 5 degrees per minute; the temperature is lowered to 0-5 degrees and kept for 4 hours.
[0042] 3: Repeat operation 2 for 3 times.
[0043] 4: After operation 3 is completed, distill methanol under reduced pressure until the methanol content of the residue is less than 1%, control the vac...
Embodiment 2
[0046] Embodiment 2: Utilize the method preparation of the present invention
[0047] 1: Take 100 grams of commercially available pyraclostrobin, add 20 grams of water, add 200 ml of methanol, heat up to 64 degrees, stir, all pyraclostrobin is dissolved, and slowly (according to the rate of 1 ℃ per minute, cool down, ) Cool down to 10 degrees, crystals are precipitated, continue to cool down to 0-5 degrees, and keep warm at 0-5 degrees for 8 hours;
[0048] 2: Keep the temperature rising at a rate of 1 degree / minute to raise the temperature. When the temperature rises to 45 degrees, some of the samples are not dissolved, and continue to cool down. The cooling rate is maintained at 1 degree / minute; the temperature is lowered to 0-5 degrees and kept for 10 hours.
[0049] 3: Repeat operation 2 for 5 times.
[0050] 4: After operation 3 is completed, distill methanol under reduced pressure until the methanol content of the residue is less than 0.5%, control the vacuum degree to ...
Embodiment 3
[0053] Embodiment 3: Utilize the method preparation of the present invention
[0054] 1: Take 100 grams of commercially available pyraclostrobin, add 2 grams of water, add 200 milliliters of methanol, heat up to 40 degrees, stir, pyraclostrobin is completely dissolved, and slowly (according to the rate of 5 degrees per minute, cool down, ) Cool down to 20 degrees, crystals are precipitated, continue to cool down to 0-5 degrees, and keep warm at 0-5 degrees for 10 hours;
[0055] 2: Keep the temperature rising at a rate of 0.5 degrees per minute to raise the temperature. When the temperature rises to 30 degrees, some of the samples are not dissolved, and continue to cool down. The cooling rate is maintained at 2 degrees per minute; the temperature is lowered to 0-5 degrees and kept for 24 hours.
[0056] 3: Repeat operation 2 for 2 times.
[0057] 4: After operation 3 is completed, distill methanol under reduced pressure until the methanol content of the residue is less than 2%,...
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