Method for preparing o-nitrophenol through phenol nitration selectivity

A technology of o-nitrophenol and selectivity, applied in the field of o-nitrophenol preparation, can solve the problem that o-nitrophenol content is difficult to exceed 95%, o-nitroanisole is difficult to recycle, and o-nitrophenol selection Poor performance and other problems, to achieve the effect of short preparation cycle, low cost, and improved catalytic activity
CN102942487BInactive Publication Date: 2014-04-09LIAOCHENG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
LIAOCHENG UNIV
Publication Date
2014-04-09
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for preparing o-nitrophenol, which comprises the following steps: nitrating phenol in mild conditions with silica loaded heteropoly acid cesium as a catalyst and low-concentration nitric acid as a nitrating agent; and successively performing extraction, distillation, steam distillation and recrystallization to obtain the o-nitrophenol. The silica loaded heteropoly acid cesium is formed by loading 1% to 40% (wt%) of heteropoly acid cesium to silica. The method for preparing o-nitrophenol has the advantages of high phenol conversion rate, high o-phenol nitration selectivity, easiness in preparation of the catalyst, high catalytic activity, easy separation of the catalyst after the action, reusability and broad application prospects.
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Description

technical field

[0001] The invention relates to a method for preparing o-nitrophenol, more specifically, the invention relates to a method for preparing o-nitrophenol with high selectivity. Background technique

[0002] O-nitrophenol can be used as an intermediate in medicine, dyes, rubber additives and photosensitive materials, and can also be used as a monochromatic pH value indicator, so the preparation of o-nitrophenol is very important. At present, the production process of o-nitrophenol is relatively mature, but there are some defects in various processes.

[0003] The traditional method is to use nitric acid as a nitrating agent to nitrate phenol, but the selectivity of o-nitrophenol in this method is poor, and the product is a mixture of o-nitrophenol and p-nitrophenol, which is then distilled, cooled, and crystallized to obtain o-nitrophenol. Nitrophenol, this method is because concentrated nitric acid has oxidation property, and phenol is oxidized to quinone compo...

Claims

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