3results about How to "Avoid violent reactions" patented technology

The invention discloses a method for synthesizing a tonalid intermediate HMT, and belongs to the technical field of organic synthesis. According to the method, a specific liquid catalyst and an organic solvent are selected to prepare a catalyst phase, raw materials required for synthesis of tonalid are mixed according to a reasonable ratio to form a raw material phase, then the two phases are introduced into a microchannel reactor for a catalytic reaction, and after the reaction is completed, a target product is obtained through post-treatment steps such as quenching, water washing and rectification. Aiming at the defects that a solid catalyst in the prior art is difficult to realize homogeneous reaction and the reaction process is violent and difficult to control, by optimizing catalyst type selection and reaction process design, a reaction system has good homogeneous property, the reaction process is milder and is easy to accurately regulate and control, the stability and reliability of product preparation are effectively improved, and the method is suitable for industrial production. The method is suitable for industrial large-scale production.

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.

This application relates to the field of heat treatment technology for metallic materials, and more particularly to a surface treatment liquid and a heat treatment method for zinc-based coated hot-formed steel. The surface treatment liquid is used in the surface treatment of zinc-based coated hot-formed steel. By mass fraction, the components of the surface treatment liquid include: phosphate: 0.5% to 1.0%, molybdate: 0.5% to 1.0%, organic surfactant: 0.01% to 0.1%, alcohol additive: 2% to 5%, and solvent: 92.9% to 96.99%. This surface treatment liquid can pre-construct a specially designed high-temperature stable composite protective film on the zinc-based coating, significantly improving the stability of the entire zinc-based coated hot-formed steel during the heat treatment process, ultimately obtaining heat-treated components with superior performance and better surface quality; and zinc combustion is difficult to occur during the overall heat treatment process.