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Preparation method of p-nitrophenol

A technology of p-nitrophenol and p-nitroaniline, which is applied in the field of preparation of p-nitrophenol, can solve problems such as pressurization, wastewater discharge, high temperature, etc., and achieve the effects of simple treatment method, safe process route, and simple operation steps

Active Publication Date: 2015-05-27
QUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The technical effect of this new technology described by this patented describes an improved way for making certain chemical compounds that have fewer side products than previous methods or requiring less expensive materials compared to current processes. This makes it easier to produce these substances without having too much pressure on them during production. Additionally, there're no complicated operations needed but just one step at once, which means they don’t harm any other things around us when used again afterward.

Problems solved by technology

The technical problem addressed in this patented text relates to manufacture or use of p- nitro phenols (p-NPs) due their instability during preparation processes like heated hydrations. These methods involve complicated steps involving multiple reactions that can result in wasted resources and environmental concerns associated therewith.

Method used

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Examples

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Effect test

Embodiment 1

[0021] (1) Salt-forming reaction: add 40g of water to a 250ml four-neck flask equipped with a thermometer, a spherical condenser, and mechanical stirring, and slowly add 40g of concentrated sulfuric acid under the condition of rapid stirring and air bath cooling, observe the temperature, and change the temperature of the oil bath. At 120°C, add 13.8g of p-nitroaniline three times, heat up to reflux after addition, react for 10 minutes until the solution is clear, remove the oil bath, air cool to below 50°C, change the water bath to cool to room temperature, a large amount of white solids precipitate out.

[0022] (2) Diazotization reaction: Transfer the reaction solution from the previous step to a low-temperature constant temperature bath, control the temperature to 0-5°C, slowly add a saturated aqueous solution containing 7g of sodium nitrite dropwise, and keep warm for 2 hours after the dropwise addition is completed. Add an appropriate amount of urea to the reaction solutio...

Embodiment 2

[0029] (1) Salt-forming reaction: add 40g of water to a 250ml four-neck flask equipped with a thermometer, a spherical condenser, and mechanical stirring, and slowly add 40g of concentrated sulfuric acid under the condition of rapid stirring and air bath cooling, observe the temperature, and change the temperature of the oil bath. At 120°C, add 13.8g of p-nitroaniline three times, heat up to reflux after addition, react for 10 minutes until the solution is clear, remove the oil bath, air cool to below 50°C, change the water bath to cool to room temperature, a large amount of white solids precipitate out.

[0030] (2) Diazotization reaction: transfer the reaction solution from the previous step to a low-temperature constant temperature bath, and control the temperature to 0-5°C. Slowly add a saturated aqueous solution containing 7g of sodium nitrite dropwise, and keep warm for 2 hours after the dropwise addition. After the warming is over, add an appropriate amount of urea to th...

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Abstract

The invention discloses a preparation method of p-nitrophenol. The method comprises the following steps: mixing a raw material, namely paranitroaniline, with a sulfuric acid aqueous solution and carrying out salt-forming reaction; carrying out diazotization reaction on the reaction product with a saturated sodium nitrite solution; hydrolyzing the obtained heavy nitride to obtain a p-nitrophenol crude product and a mother liquid; and recrystallizing the p-nitrophenol crude product to obtain a product, namely the pure p-nitrophenol product, wherein the mother liquid is recycled and reused. The preparation method is safe in process route; the operation steps are simple and convenient; the technological design is environment-friendly; most of mother liquid basically can be repeatedly recycled and reused; and the recycling and reusing treatment method is simple.

Description

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Claims

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Application Information

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Owner QUZHOU UNIV
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