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Production process of o-fluoronitrobenzene

A technology for o-fluoronitrobenzene and production process, which is applied in the field of production technology of o-fluoronitrobenzene, can solve the problems of difficulty in recovering odor, difficulty in recovering sulfolane, easy explosion of nitro compounds, etc., and achieves scientific and reasonable process design. , easy recovery, high reaction efficiency

Inactive Publication Date: 2010-09-22
盘锦鸿鹤氟化学有限公司
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Problems solved by technology

O-fluoronitrobenzene is a commonly used chemical product. Most of the processes for producing o-fluoronitrobenzene use sulfolane as a solvent, but the recovery of sulfolane is difficult, and the nitro substances in high temperature periods are prone to explosion. Dimethyl sulfoxide is used to Recycling odor is also difficult to solve; in addition, choosing a catalyst with low price and high reactivity is also a technical problem that needs to be solved in this process

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  • Production process of o-fluoronitrobenzene
  • Production process of o-fluoronitrobenzene

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Embodiment Construction

[0013] The present invention will be further explained below in conjunction with specific examples.

[0014] The specific production process of o-fluoronitrobenzene, the steps are as follows:

[0015] (1) Fluorination: add o-chloronitrobenzene, tetramethylammonium chloride, DMF, and potassium fluoride into the kettle (note that potassium fluoride must be added quickly, and try to avoid its contact with air), heat up under stirring, and keep The reaction is carried out at a temperature of 175-185°C. Sampling was carried out after 4 hours of reaction. If the content of o-fluoronitrobenzene in the raw material was less than 3% (GC normalization subtracted solvent analysis), the reaction was considered to be over. If > 3%, continue to keep warm until the standard is reached. The reaction was stopped and distillation under reduced pressure was started.

[0016] (2) Distillation under reduced pressure: first slowly evacuate to prevent bumping, and when the temperature of the kett...

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Abstract

The invention discloses a production process of o-fluoronitrobenzene. Fluorination is carryied out on main materials of o-chloronitrobenzene and potassium fluoride, and then after vacuum distillation and rectification, the o-fluoronitrobenzene product can be obtained. The process has scientific and reasonable design and adopts DMF as the solvent which is easy to be recycled and has high reaction efficiency; and simultaneously, tetramethylammonium chloride as the catalyst is cheap and has high reaction activity, thus saving the cost.

Description

technical field [0001] The invention relates to a compound synthesis method, in particular to a production process of o-fluoronitrobenzene. Background technique [0002] O-fluoronitrobenzene, the English abbreviation is O-FNB, the molecular formula is C 6 h 4 FNO 2 , Pale yellow transparent liquid, easily soluble in organic solvents, insoluble in water. O-fluoronitrobenzene is a commonly used chemical product. Most of the processes for producing o-fluoronitrobenzene use sulfolane as a solvent, but the recovery of sulfolane is difficult, and the nitro substances in high temperature periods are prone to explosion. Dimethyl sulfoxide is used to Recycling odor is also difficult to solve; in addition, choosing a catalyst with low price and high reactivity is also a technical problem that needs to be solved in this process. Contents of the invention [0003] In order to overcome above-mentioned deficiency, the present invention provides a kind of production technology of o-f...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C205/12C07C201/12
Inventor 郭振伟刘文波
Owner 盘锦鸿鹤氟化学有限公司
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