High-purity and thermodynamically stable amicarbazone crystal and preparation method thereof

The invention provides a high-purity and thermodynamically stable amicarbazone crystal and a preparation method thereof, and relates to the technical field of herbicides, the amicarbazone crystal is a triclinic crystal, the space group is that the cell parameters are alpha = 114.163 degrees, beta = 119.268 degrees and gamma = 94.136 degrees, and the purity of the amicarbazone crystal is 96.5% or above. The preparation method comprises the following steps: preparing an amicarbazone crystal seed, and carrying out induced crystallization by using the amicarbazone crystal seed. The amicarbazone crystal provided by the invention is more thermodynamically stable, and compared with the existing amicarbazone in an amorphous or crystal form, the amicarbazone crystal has better herbicidal activity, and especially improves the herbicidal effect on two weeds, namely barnyard grass and millet. 本发明提供了一种高纯度、热力学稳定的氨唑草酮晶体及其制备方法，涉及除草剂技术领域，氨唑草酮晶体为三斜晶，空间群为晶胞参数为α＝114.163°，β＝119.268°，γ＝94.136°，氨唑草酮晶体的纯度为96.5％以上。其制备方法包括：氨唑草酮晶体晶种的制备