Abstract

A method for synthesizing a ketoxime is provided. In a system of an aqueous carbonate solution, a reaction is performed on a ketone, ammonia and hydrogen peroxide by using a titanium-silicon molecular sieve as a catalyst to obtain the ketoxime. Moreover, a reaction progress is judged and an optimal reaction ratio is determined by a real-time monitoring of a pH value in a reaction system during the reaction. In the present invention, by monitoring the pH value in the reaction system, the progress of the reaction is judged, thereby determining the optimal reaction ratio. The pH of the system is further adjusted by an aqueous carbonate solution to increase the reaction velocity and conversion rate of the ammonia.

IPC Classes  ?

• C07C 249/14 - SeparationPurificationStabilisationUse of additives

Abstract

The present invention discloses a triazine compound, a preparation method therefor, and an application thereof. A novel triazine compound is prepared using 2,2'-dihydroxybiphenyl, phosphorus oxychloride, triethylamine, and melamine as the main raw materials. The compound not only has a carbon source (biphenyl structure), but also an acid source (phosphoric acid structure) and a gas source (melamine). The charring agent thus produced has favorable charring properties, a high thermal decomposition temperature, and good stability, and produces a large amount of carbon residue. The preparation method of the present invention features mild reaction conditions, fewer side reactions, a simple operation flow, a greatly shortened reaction period, and safe and readily available raw materials, and uses water as a reaction medium, avoiding use of organic solvents, simplifying post-treatment processes, and facilitating industrial production. The solvent and mother liquor of the present invention can be recycled and reused, allowing for a simple process operation flow, and avoiding the disadvantages in existing processes of prolonged reaction times and usage of large amounts of organic solvents.

IPC Classes  ?

• C07F 9/6574 - Esters of oxyacids of phosphorus
• C08K 5/3492 - Triazines
• C08K 5/527 - Cyclic esters

Abstract

Disclosed is a process method for the synthesis of a ketoxime. The method comprises reacting a ketone and ammonia with hydrogen peroxide to obtain a ketoxime with a titanium silicon zeolite as a catalyst in an aqueous carbonate solution system; and determining the reaction course by means of real-time monitoring of the pH of the reaction system during the reaction and determining an optimum reaction ratio. In the present invention, the reaction course is determined by monitoring the pH within the reaction system, and thereby determining the optimum reaction ratio, and the pH is further adjusted with an aqueous carbonate solution to improve the reaction rate and ammonia conversion rate.

IPC Classes  ?

• C07C 249/08 - Preparation of compounds containing nitrogen atoms doubly-bound to a carbon skeleton of oximes by reaction of hydroxylamines with carbonyl compounds
• C07C 251/42 - Oximes with oxygen atoms of oxyimino groups bound to hydrogen atoms or to carbon atoms of unsubstituted hydrocarbon radicals with the carbon atom of at least one of the oxyimino groups bound to a carbon atom of a ring other than a six-membered aromatic ring
• C07C 251/38 - Oximes with oxygen atoms of oxyimino groups bound to hydrogen atoms or to carbon atoms of unsubstituted hydrocarbon radicals with the carbon atoms of the oxyimino groups bound to hydrogen atoms or to acyclic carbon atoms to carbon atoms of a saturated carbon skeleton