Method for preparing o-nitroanisole and p-nitroanisole from mixed nitrochlorobenzene

A technology for p-nitroanisole and o-nitroanisole is applied in the field of preparing o-nitroanisole and p-nitroanisole, and can solve the problem of intractable waste residue, poor operation safety performance and harsh operating conditions and other problems to achieve the effect of reducing production costs and saving energy
CN103073431AInactive Publication Date: 2013-05-01CHANGZHOU JIASEN CHEM
0 Cites 10 Cited by

Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
CHANGZHOU JIASEN CHEM
Publication Date
2013-05-01
Estimated Expiration
Not applicable Β· inactive patent

Smart Images

  • Figure 1
    Figure 1
Patent Text Reader

Abstract

The invention relates to a method for preparing o-nitroanisole and p-nitroanisole from mixed nitrochlorobenzene. According to the invention, mixed nitrochlorobenzene consisting of a product obtained after nitration of chlorobenzene, o-nitrochlorobenzene, m-nitrochlorobenzene and p-nitrochlorobenzene is used as a raw material, and in a methanol system, 30% of alkali lye and a phase-transfer catalyst are added for a reaction to prepare products of o-nitroanisole and p-nitroanisole, wherein m-nitrochlorobenzene does not participate in the reaction. The method provided by the invention overcomes the problems of great investment for rectifying tower equipment, great energy consumption in rectification, high cost, long process flow, harsh operation conditions, poor operational safety performances and generation of waste residues hardly to treat in rectification-crystallization separation of mixed nitrochlorobenzene in conventional production processes for o-nitroanisole and p-nitroanisole and overcomes the technical problems of generation of considerable alkaline waste water containing sodium hyposulfite and production of a poor-quality product in a sodium sulfide reduction process.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The present invention relates to the technical field of preparation methods of o-nitroanisole and p-nitroanisole, in particular to a product obtained by nitration of chlorobenzene, o-p-nitrochlorinated benzene, m-p-nitrochlorinated benzene and P-nitrochlorinated benzene is a method for preparing o-nitroanisole and p-nitroanisole by mixing nitrochlorinated benzene as a raw material. Background technique

[0002] o-Nitroanisole and p-Nitroanisole are important organic intermediates. The key step to produce nitrophenyl ether with chlorobenzene as raw material is to produce nitrochlorobenzene mixture through mixed acid nitration reaction, nitrochlorobenzene mixture After rectification-crystallization separation, o-nitrochlorobenzene, m-nitrochlorobenzene and p-nitrochlorobenzene are obtained, and then they are further processed by etherification to obtain the corresponding nitrophenyl ether products. Although there are mature processes and "three wastes" ...

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