Production method of p-nitrophenol

A production method and a technology for p-nitrophenol are applied in the production field of p-nitrophenol, and can solve the problems of errors in the cooling crystallization process, low automation level, poor product quality, etc., so as to reduce energy consumption and production costs, improve purity and Yield, effect of reducing production steps

Inactive Publication Date: 2020-09-25
ANHUI DONGZHI GUANGXIN AGROCHEMICAL CO LTD
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Production method of p-nitrophenol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Such as figure 1 Shown, a kind of production method of p-nitrophenol, production method is based on the production system of p-nitrophenol, and production system comprises the nitration tank that is arranged on the front end, and the downstream of nitration tank is provided with settling tank and crude product centrifuge, settling tank And the downstream of the centrifuge is provided with an alkali cleaning kettle, the downstream of the alkali cleaning kettle is provided with a washing kettle, the downstream of the water washing kettle is provided with an oven for drying the crude product, and the downstream of the drying oven for the crude product is provided with a recrystallization kettle, and the downstream of the recrystallization kettle is arranged There are high-quality centrifuges and high-quality drying ovens;

[0025] The production method includes the following steps:

[0026] 1). Nitrification: transfer phenol to phenol spray tank, heat up to 80°C, mix conc...

Embodiment 2

[0039] The difference between this embodiment and embodiment 1 is:

[0040]A production method of p-nitrophenol, the production method is based on the production system of p-nitrophenol, the production system includes a nitration tank arranged at the front end, a settling tank and a crude product centrifuge are arranged downstream of the nitration tank, the settling tank and the centrifuge The downstream of the alkali washing kettle is provided with an alkali washing kettle, the downstream of the alkali washing kettle is provided with a washing kettle, the downstream of the water washing kettle is provided with an oven for drying crude products, the downstream of the drying oven for crude products is provided with a recrystallization kettle, and the downstream of the recrystallization kettle is provided with a fine centrifugal Machine and fine drying oven;

[0041] The production method includes the following steps:

[0042] 1). Nitrification: transfer phenol to phenol spray ...

Embodiment 3

[0054] The difference between this embodiment and embodiment 1, 2 is:

[0055] A production method of p-nitrophenol, the production method is based on the production system of p-nitrophenol, the production system includes a nitration tank arranged at the front end, a settling tank and a crude product centrifuge are arranged downstream of the nitration tank, the settling tank and the centrifuge The downstream of the alkali washing kettle is provided with an alkali washing kettle, the downstream of the alkali washing kettle is provided with a washing kettle, the downstream of the water washing kettle is provided with an oven for drying crude products, the downstream of the drying oven for crude products is provided with a recrystallization kettle, and the downstream of the recrystallization kettle is provided with a fine centrifugal Machine and fine drying oven;

[0056] The production method includes the following steps:

[0057] 1). Nitrification: transfer phenol to phenol sp...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C07C201/08C07C201/16C07C205/22
CPCC07C201/08C07C201/16C07C205/22
Inventor 黄中桂袁晓林朱礼华杨镭王彪
Owner ANHUI DONGZHI GUANGXIN AGROCHEMICAL CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap