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Location:Home > TECHNOLOGY

Industrial technology transfer of 20,000 tons of 3,5,6-trichloropyridin-2-ol

Share Last update:2018-11-19 14:40

Product Name:Sodium 3,5,6-trichloropyridin-2-ol

CAS No.:37439-34-2



Technology Details


Cooperation mode:Transfer or cooperative production


Market price:Under the background of the increasing market demand for chlorpyrifos in the current industrial chain, the market prospects of the project products are relatively broad. China has become the world's largest production base for chlorpyrifos. In 2010, the production of chlorpyrifos in China was about 50,000 tons, and the production capacity exceeded 110,000 tons/year. The global consumption of chlorpyrifos (converted into the original drug) was close to 80,000 tons, and the compound annual growth rate in the past five years. Reached 12%.

Route of Synthesis:The production process of this project uses trichloroacetyl chloride and acrylonitrile as raw materials to form sodium trichloropyridinium by addition, cyclization and aromatization.

Equipment needed:

Solvent Treatment Kettle|F12500| CS|14
Solvent distillation kettle|F16000| CS |10
Refined kettle|F12500|CS|20 sets
Crystallization kettle|F10000| CS | 22
Alkali solution kettle|Fl0000|搪玻璃|8 sets
Insulation kettle|F10000 |CS|8 sets
Desolvent kettle F5000|搪玻璃|8 sets of various tanks, pumps, distillation towers, centrifuges, dryers, etc.

Wastes:There is basically no waste gas and solid waste, and the wastewater is 35,000 tons/year.

More information

This project uses trichloroacetyl chloride and acrylonitrile as starting materials, and adds, cyclizes and aromatizes at a certain temperature in the presence of a solvent and a catalyst to obtain sodium trichloropyridinium.
The process is as follows:
(1) Addition/cyclization: The raw materials are separately pumped into the respective metering tanks, and then charged into the glass-lined reactor according to the molar ratio of trichloroacetyl chloride, acrylonitrile and nitrobenzene (1:1.4:2.5), and the appropriate amount is added. Catalyst (CuCl).
The oil boiler is turned on to start heating (the heat transfer oil is the heating medium to improve the performance of the reactor, so the heat transfer oil is used as the heat carrier), and the cooler is turned on to freeze the brine. The temperature is raised to 135 ° C (starting at around 80 ° C), and the reaction is kept at a constant temperature for 20 hours. After the reaction is completed, the reaction material is pumped to the distillation pot, and the cooler return tube is opened, and the heat transfer oil is heated to 120 ° C to 130 ° C to remove the distillation under reduced pressure. Dissolve, keep the negative pressure 2.7~4.0KPa, and remove the solvent to the receiving tank for solvent purification or purification.
(2) Alcoholysis / aromatization The residual liquid in the distillation pot was driven into the alkali decomposing kettle, and the 33% NaOH solution was slowly added dropwise to carry out alkali hydrolysis. The reaction kettle was used to absorb the heat released by the reaction in the chilled brine, and the temperature was controlled. 20 ° C ~ 40 ° C, to pH = 10, stop the addition, the kettle material is placed in the plate and frame filter press for filtration, the waste water into the waste water tank, wet products to the dryer after drying and weighing packaging.
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