3results about How to "Reaction process green" patented technology

This invention relates to the field of N-(2,4-dinitrophenyl)-4-nitrobenzamide preparation technology, specifically to a green method for preparing nitramide compounds. The method involves adding a catalyst and dispersant to a reactor and mixing them uniformly. Then, a first and a second stream of materials are simultaneously added dropwise to the reactor for reaction. The temperature within the system is controlled during the dropwise addition. After the dropwise addition is complete, the temperature is increased to continue the reaction. After the reaction is completed, N-(2,4-dinitrophenyl)-4-nitrobenzamide is obtained through post-treatment. The first stream is a dispersion containing 4-nitro-N-phenylbenzamide, and the second stream is a nitrating agent consisting of a uniform mixture of N₂O₅ and nitric acid. This preparation method features high product conversion rate, a mild reaction process, safe and controllable production process, effectively reduces the amount of residual intermediates, and minimizes pollution.

The invention discloses a preparation method of a carbon dot / silicon carbide composite material as well as a product and application thereof, and the preparation method comprises the following steps: (1) taking coal pitch as a raw material, mixing with an oxidizing agent, carrying out oxidation reaction, and then carrying out post-treatment to obtain carbon dots; and (2) mixing the carbon dots and silicon carbide prepared in the step (1) with deionized water, and performing hydrothermal reaction to obtain the carbon dot / silicon carbide composite material. The prepared composite material can improve the light absorption capacity and the photo-generated carrier generation capacity, and the hydrogen peroxide generation rate can be remarkably increased when the composite material is applied to the photocatalytic hydrogen peroxide generation reaction as a catalyst.

The invention relates to a method for preparing cyclododecanone oxime, which comprises the following steps: in the presence of a solid acid catalyst, cyclododecanone, an oxime compound and an optional solvent are mixed for oxime exchange reaction, and the solvent is a non-acidic solvent. According to the method disclosed by the invention, the oxime in the oxime compound is replaced by cyclododecanone under the action of the solid acid catalyst instead of using a liquid acid catalyst, so that the problems that the liquid acid catalyst is difficult to separate from the reaction liquid, the catalyst cannot be repeatedly used and the like are solved; the separation and purification process of the product and the reaction liquid in the oxime exchange reaction process is effectively simplified, and the method is a continuous and green production process and has a better application prospect.