Production method of p-nitrophenol

Abstract

The invention relates to a production method of p-nitrophenol, which is based on a production system of p-nitrophenol, and comprises the following specific steps: carrying out positioning nitrification on phenol to synthesize p-nitrophenol, carrying out sedimentation, neutralization, washing and drying to obtain a crude p-nitrophenol product, and recrystallizing the crude product to obtain a high-purity product. According to the invention, p-nitrophenol is generated through positioning nitrification on phenol used as a raw material, a series of conventional operations are performed to obtain ap-nitrophenol crude product, and the p-nitrophenol crude product is recrystallized to obtain the high-purity p-nitrophenol. According to the invention, the production steps of p-nitrophenol are reduced, introduction of high-toxicity chlorobenzene and subsequent hydrolysis operation steps are avoided, the energy consumption and the production cost are further reduced, the high-purity product is crystallized from the p-nitrophenol crude product in a recrystallization mode, the purity and the yield of the product can be remarkably improved, the purity of the product is 98% or above, the yield ofthe product is 90% or above, and the method has good practicability and market prospects.

Description

technical field [0001] The invention relates to the technical field of chemical products, and more precisely relates to a production method of p-nitrophenol. Background technique [0002] p-Nitrophenol, pure product is light yellow crystal, odorless, melting point 114-116°C, boiling point 279°C, flash point 169°C, relative density 1.479 (20 / 4°C), slightly soluble in water (1.6%, 25°C) at room temperature ℃), not easy to volatilize with steam, easily soluble in ethanol, chloroform and ether, when dissolved in acid solution, the light yellow gradually recedes, between PH3~4, almost colorless, when dissolved in lye, the color deepens and can sublimate. [0003] p-Nitrophenol has a wide range of uses, it can be used as dye intermediates, raw materials for medicines and pesticides, acid-base indicators, analytical reagents, leather preservatives, and also used as intermediates for dyes, medicines and pesticides in organic synthesis body. p-Nitrophenol is also an important raw m...

AI Technical Summary

Problems solved by technology

[0004] Because the method is easy to get raw materials and simple process, most of the downstream products do not have high requirements on its quality. Therefore, the production of p-nitrophenol mostly adopts relatively primitive pure manual operation, and the automation level is low, but manual operation leads to feeding, reaction process and There are large errors in the cooling crystallization process, resulting in poor product quality and low yield

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