Synthesis process of fenitrothion
A synthesis process, the fenitrothion technology, is applied in the fenitrothion synthesis process field, which can solve the problems of low content of fenitrothion, easy decomposition and failure, and many by-products, so as to achieve less by-products, avoid fire accidents, and dehydrate fast effect
Active Publication Date: 2017-10-20
连云港埃森化学有限公司
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Problems solved by technology
The agent is stable to light, and it is easy to decompose and fail when exposed to high temperature. It is hydrolyzed in an alkaline medium, and iron, tin, aluminum, copper, etc. will cause the drug to decompose. It can be stored in a glass bottle for a long time. The current preparation method produces fenitrothion Low phosphorus content, many by-products, serious pollution
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment
[0028] A synthetic technique for fenitrothion, the steps are as follows:
[0029] (1) Preparation of m-cresol and sodium nitrite mixed solution: earlier, in the sodium nitrite storage tank, the sodium nitrite solution is squeezed into the sodium nitrite metering tank with a submerged pump, and 850Kg32% of the sodium nitrite solution is added to the mixing kettle In the process, the m-cresol in the m-cresol storage tank is then squeezed into the m-cresol metering tank with a submerged pump, and 421kg of m-cresol is also added in the mixing kettle, and the mixing kettle is started to stir so that the two materials are mixed evenly. Keep the mixture at room temperature for later use;
[0030] (2) Nitrosation reaction: After checking that the equipment is normal, first put the dilute nitric acid prepared in the dilute acid storage tank into the dilute acid metering tank with a submerged pump, and then put 5950Kg of 18-20% dilute nitric acid into the nitrosation kettle During the ...
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A synthesis process of fenitrothion comprises the following steps: (1) preparing a mixed solution of m-cresol and sodium nitrite; (2) performing a nitrosation reaction; (3) performing an oxidation reaction; (4) filtering to obtain crude nitrate; (5) performing a condensation reaction; (6) washing by using alkaline and water; (7) desolventizing to obtain the finished product fenitrothion. Compared with the prior art, the synthesis process of fenitrothion has the beneficial effects as follows: after 4-nitro-m-cresol in the nitrate reacts with soda ash to obtain phenol sodium salt, with anhydrous cuprous chloride as a catalyst, condensation is performed on the phenol sodium salt and methyl chloride, and after a crude product is decolorized by using activated carbon and washed by using the alkali and the water, distillation under reduced pressure is performed to obtain the finished fenitrothion original medicine, so that pollution caused by harmful impurities is reduced, few byproducts are produced, and occurrence of a fire accident in the product drying process is avoided. According to a solvent method adopted by the invention, the dewatering speed is high, the production process is simplified, the production efficiency is improved, and the production cost is reduced.
Description
Technical field: [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a synthesis process of fenitrothion. Background technique: [0002] Fenitrothion (fenitrothion) is an organophosphorus insecticide. Moderate toxicity, low toxicity to humans and animals, the acute oral LD50 of rats is 400-800 mg / kg, and the acute percutaneous LD50 of rats is 1200 mg / kg. Fenitrothion has contact killing and stomach poisoning effects, no systemic and fumigation effects, medium residual effect period, wide insecticidal spectrum, special effect on Lepidoptera larvae, and can also control Hemiptera, Coleoptera and other pests. The agent is stable to light, and it is easy to decompose and fail when exposed to high temperature. It is hydrolyzed in an alkaline medium, and iron, tin, aluminum, copper, etc. will cause the drug to decompose. It can be stored in a glass bottle for a long time. The current preparation method produces fenitrothion The ...
Claims
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Patent Timeline
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CPCC07F9/18
Inventor 刘伟周雄飞李惠跃张彦祥乐贵洲
Owner 连云港埃森化学有限公司