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Process of producing pentafluorophenol

A technology of pentafluorophenol and pentafluorobromobenzene, which is applied in the field of pentafluorophenol production, can solve the problems that restrict the industrial production process of pentafluorophenol, the supply of raw materials cannot be guaranteed, and hexafluorobenzene is difficult to obtain. The effect of high purity and simple production process

Active Publication Date: 2006-10-18
内蒙古永太化学有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] For these two processes, due to the difficulty in obtaining hexafluorobenzene, the supply of raw materials cannot be guaranteed during production, which seriously restricts the industrial production process of pentafluorophenol

Method used

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  • Process of producing pentafluorophenol
  • Process of producing pentafluorophenol
  • Process of producing pentafluorophenol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0030] Refer to attached figure 1 . Install electric stirring paddle, dropping funnel, N 2 The inlet pipe, thermometer and five-ball reflux condenser are equipped with a calcium chloride drying tube on the condenser.

[0031] 12.6g (0.52mol) of magnesium chips inside the bottle, 1 small grain of iodine and 150ml of tetrahydrofuran, N 2 Heat up to 50°C under protection, add dropwise a solution made of 123.5g (0.50mol) pentafluorobromobenzene and 120ml tetrahydrofuran, the reaction temperature is 50-55°C, keep warm for 2 hours after addition, and cool to room temperature. The above reaction is a Grignard reaction, the product is a Grignard reagent, and the reaction equation is:

[0032]

[0033] Stir in a 1000ml three-necked bottle, put a thermometer, and a dropping funnel, put 200ml of tetrahydrofuran and 63.6g (0.6mol) of 85% tert-butyl hydroperoxide into the bottle, cool to -15°C, and add dropwise at -15 to 10°C A good Grignard reagent was added and incubated for 1 hou...

Embodiment 1-2

[0038] Pre-weigh 130kg of magnesium chips and 500g of iodine, measure 150L of tetrahydrofuran, add them into a 500L reaction pot, open the valve of the stirring and condenser, connect the drying pipe, fill the air in the kettle with nitrogen, and maintain an appropriate nitrogen flow rate, Heat up to 50°C and stir for 30 minutes, add 4-6% of the total amount of pentafluorobromobenzene tetrahydrofuran solution prepared in advance to 1300kg: 120L from the high-level tank, wait for the reaction in the pot to start, and the internal temperature will rise to 50-55°C , the remaining pentafluorobromobenzenetetrahydrofuran solution was added, and kept at this temperature for 2 hours. After the end, the jacket was opened to cool water and cooled to room temperature for use.

[0039] Put 200L tetrahydrofuran and 640kg peroxide into a 1000L dry reaction pot, and when it is cooled to -15°C, add the Grignard reagent to be used in the previous step, and control the dropping temperature at -1...

Embodiment 1-3～ Embodiment 1-15

[0042] Among the above examples, examples 1-3 to 1-12 use tetrahydrofuran as the organic solvent. Embodiment 1-13 uses ether as the organic solvent, embodiment 1-14 uses propyl ether as the organic solvent, embodiment 1-15 uses isopropyl ether as the organic solvent, and embodiment 1-16 uses butyl ether as the organic solvent.

[0043] Embodiment 1-3~Example 1-8 Grignard reaction temperature 50~55 ℃, embodiment 1-9~Example 1-11 Grignard reaction temperature 57~63 ℃, embodiment 1-2~embodiment 1- 14 The Grignard reaction temperature is 39-45°C, the Grignard reaction temperature is 32-38°C in Example 1-15, and the Grignard reaction temperature is 62-68°C in Example 1-16.

[0044]The mol ratio of embodiment 1-3~embodiment 1-8 pentafluorobromobenzene and magnesium is 1: 1.2, the mol ratio of embodiment 1-9~embodiment 1-11 pentafluorobromobenzene and magnesium is 1: 0.95, The mol ratio of embodiment 1-12~embodiment 1-14 pentafluorobromobenzene and magnesium is 1: 1.0, and th...

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Abstract

The present invention provides process of preparing pentafluoropheol. Pentafluoro bromobenzene as initial material is first made to produce Grignard reaction to result in Grignard reagent, and the Grignard reagent is then oxidized with peroxide to prepare pentafluoropheol. The process of the present invention has simple technological process, no need of special apparatus, high product yield, high product purity and low production cost.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for producing pentafluorophenol. Background technique [0002] Fluorophenol is an important chemical intermediate, which is mainly used in the preparation of pharmaceutical, liquid crystal and polymer material intermediates. Its English name is Pentafluorophenol, and its structural formula is Molecular formula is C 6 HF 5 O, the molecular weight is 184.07, the CAS is 771-61-9, it is a white crystal, easy to absorb water, and the melting point is 34-36 ℃. Judging from literature reports, it passes through the following two process routes: [0003] 1, [0004] [0005] 2, [0006] [0007] For these two processes, due to the difficulty in obtaining hexafluorobenzene, the supply of raw materials cannot be guaranteed during production, which seriously restricts the industrial production process of pentafluorophenol. Conte...

Claims

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Application Information

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IPC IPC(8): C07C39/27C07C37/60
Inventor 何人宝钟建新王莺妹章正秋
Owner 内蒙古永太化学有限公司
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