Preparation method of cyclopentanone oxime

The invention discloses a method for preparing cyclopentanone oxime, which comprises the following steps: carrying out ammoximation reaction on cyclopentanone, gaseous ammonia and hydrogen peroxide under the action of a catalyst, filtering the reaction mixture while hot to obtain a cyclopentanone oxime aqueous solution, and cooling and crystallizing the cyclopentanone oxime aqueous solution to obtain a cyclopentanone oxime product. Compared with the prior art, the preparation method not only avoids the use of harmful solvents, shortens the production process flow, reduces the energy consumption and improves the production efficiency, but also has the characteristics of mild reaction conditions, high cyclopentanone conversion rate, good cyclopentanone oxime selectivity, high purity and the like, and is beneficial to large-scale industrial production. 本发明公开了一种环戊酮肟制备的方法，该方法是将环戊酮、气氨和双氧水在催化剂作用下进行氨肟化反应后，反应混合物趁热过滤，得到环戊酮肟水溶液，所述环戊酮肟水溶液进行冷却结晶，得到环戊酮肟产品。该制备方法相对现有工艺，不但避免了使用有害溶剂，缩短了生产工艺流程、降低了能耗、提高了生产效率，而且具有反应条件温和、环戊酮转化率高、环