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Non-polluted method for producing o-chloroaniline with ferrous powder as reducer

An o-chloroaniline and non-polluting technology is applied in the field of production of o-chloroaniline by reduction of non-polluting iron powder, which can solve problems such as heavy pollution and high energy consumption, and achieve the effects of saving consumption, reducing consumption and reducing production.

Inactive Publication Date: 2009-03-04
淮安嘉诚高新化工股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to: provide a method for producing o-chloroaniline by reduction of non-polluting iron powder, solve the defects of heavy pollution and high energy consumption in the production of o-chloroaniline by the reduction method of iron powder at present, and realize the clean production of o-chloroaniline

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0012] Example 1: O-chloroaniline was produced according to the following specific steps: 1) o-Nitrochlorobenzene, hydrochloric acid, water and iron powder were put into a reaction kettle at a mass ratio of 1:0.017:0.33:1, and the reduction reaction was carried out at a temperature of 90°C;

[0013] 2) Transfer the feed liquid after the reduction reaction to a rake-type vacuum dryer to separate o-chloroaniline, water and iron sludge, o-chloroaniline and water are steamed out together, and the crude product of o-chloroaniline and water are separated after condensation , the separated water is returned to the reduction process, and the iron powder obtained after drying is packaged and sold; the temperature during the vacuum distillation process is 130°C, and the pressure is -0.095MPa;

[0014] 3) The crude product of o-chloroaniline obtained after separation is sent to a rectification tower for rectification to obtain the finished product of o-chloroaniline. The product yield is...

example 2

[0015] Example 2: Production of o-chloroaniline according to the following specific steps: 1) Put o-nitrochlorobenzene, hydrochloric acid, water and iron powder into a reaction kettle at a mass ratio of 1:0.017:0.33:1, and perform a reduction reaction at a temperature of 95°C;

[0016] 2) Transfer the feed liquid after the reduction reaction to a rake-type vacuum dryer to separate o-chloroaniline, water and iron sludge, o-chloroaniline and water are steamed out together, and the crude product of o-chloroaniline and water are separated after condensation , the separated water is returned to the reduction process, and the iron powder obtained after drying is packaged and sold; the temperature during the vacuum distillation process is 155°C, and the pressure is -0.063MPa;

[0017] 3) The crude product of o-chloroaniline obtained after separation is sent to a rectification tower for rectification to obtain the finished product of o-chloroaniline. The product yield is 97.5%, the pr...

example 3

[0018] Example 3: Production of o-chloroaniline according to the following specific steps: 1) Put o-nitrochlorobenzene, hydrochloric acid, water and iron powder into the reactor at a mass ratio of 1:0.017:0.33:1, and carry out the reduction reaction at a temperature of 100°C;

[0019] 2) Transfer the feed liquid after the reduction reaction to a rake-type vacuum dryer to separate o-chloroaniline, water and iron sludge, o-chloroaniline and water are steamed out together, and the crude product of o-chloroaniline and water are separated after condensation , the separated water is returned to the reduction process, and the iron powder obtained after drying is packaged and sold; the temperature during the vacuum distillation process is 180°C, and the pressure is -0.03MPa;

[0020] 3) The crude product of o-chloroaniline obtained after separation is sent to a rectification tower for rectification to obtain the finished product of o-chloroaniline. The product yield is 97.1%, the prod...

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Abstract

The invention relates to an environment friendly method for reduction producing o-chloroaniline with iron powder. The method comprises adopting o-nitrochlorobenzene as the raw material and the iron powder as a reducing agent; separating o-chloroaniline, water andiron mud by vacuum distilling to obtain a coarse o-chloroaniline product; and refining by rectifying to obtain o-chloroaniline. The method solves the defects in the prior art on heavy pollution and high energy consumption, and implements the clear production of o-chloroaniline.

Description

technical field [0001] The invention relates to a production method of o-chloroaniline, in particular to a method for reducing pollution-free iron powder to produce o-chloroaniline. Background technique [0002] O-chloroaniline is an important organic chemical intermediate, widely used in polyurethane, pesticide, medicine and dye industries. [0003] There are many ways to synthesize o-chloroaniline, which can be summarized as follows: iron powder reduction method, alkali sulfide reduction method, electrolytic reduction method, methanol cracking hydrogen reduction method, zinc powder reduction method, hydrogenation reduction method, etc. From the comparison of the production process, the iron powder reduction method and the alkali sulfide reduction method have been included in the list of eliminated processes in my country due to heavy pollution and high energy consumption; the electrolytic reduction method consumes too much energy; Too mature, on the other hand, the consump...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C211/52C07C209/36
Inventor 王士玉
Owner 淮安嘉诚高新化工股份有限公司
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