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The waste water treatment method of the p-nitrochlorobenzene route of para-position ester

A nitrochlorobenzene route, wastewater treatment technology, applied in natural water treatment, multi-stage water treatment, water/sewage treatment, etc., can solve the problems of toxicity, high cost of DMF, wastewater pollution, etc. The effect of high water efficiency and high energy consumption

Active Publication Date: 2020-06-19
新乡市锦源化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But, because the condensation reaction of nitrochlorobenzene route uses DMF as solvent, and DMF cost is high and has toxicity, and the pollution of this waste water is serious

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A kind of waste water treatment method of the p-nitrochlorobenzene route of para-ester, comprising:

[0041] Prepare the water-removing molecular sieve according to the volume ratio of 3A molecular sieve and 4A molecular sieve is 4:1. Add the activated water-removing molecular sieve into the condensation waste water and keep the mechanical stirring at 100r / min: pass nitrogen gas preheated to 70°C into the condensation waste water at a rate of 0.15L / min per liter of solution, and continue to ventilate for 100min; the ventilating ends Afterwards, reduce the pressure to 0.65 atm and keep it for 180 minutes; after finishing the decompression, increase the pressure to 1.25 atm and keep it for 80 minutes, and separate the solid and liquid to obtain the first concentrate. Attach the activated water-removing molecular sieve to the stirring rod, keep the stirring rod rotating at 250r / min, pressurize the container to 1.6atm and heat it to 90°C, spray the atomized first concentrat...

Embodiment 2

[0043] A kind of waste water treatment method of the p-nitrochlorobenzene route of para-ester, comprising:

[0044] Prepare the water-removing molecular sieve according to the volume ratio of 3A molecular sieve and 4A molecular sieve is 5:1. Add the activated water-removing molecular sieve into the condensation wastewater and maintain a mechanical stirring of 120r / min: pass nitrogen gas preheated to 50°C into the condensation wastewater at a rate of 0.2L / min per liter of solution, and continue to ventilate for 90min; the ventilating is over Then decompress to 0.75atm and keep it for 150min; after finishing the decompression, pressurize to 1.3atm and keep it for 100min, and separate the solid and liquid to get the first concentrate. Attach the activated water-removing molecular sieve to the stirring rod, keep the stirring rod rotating at 300r / min, pressurize the container to 1.8atm and heat it to 100°C, spray the atomized first concentrated liquid into the container and stir T...

Embodiment 3

[0046] A kind of waste water treatment method of the p-nitrochlorobenzene route of para-ester, comprising:

[0047] Prepare the water-removing molecular sieve according to the volume ratio of 3A molecular sieve and 4A molecular sieve is 3:1. Add the activated water-removing molecular sieve into the condensation wastewater and maintain a mechanical stirring of 80r / min: pass nitrogen gas preheated to 80°C into the condensation wastewater at a rate of 0.1L / min per liter of solution, and continue ventilation for 120min; the ventilation is over Afterwards, reduce the pressure to 0.55 atm and keep it for 200 minutes; after finishing the decompression, increase the pressure to 1.2 atm and keep it for 60 minutes, and separate the solid and liquid to obtain the first concentrate. Attach the activated water-removing molecular sieve to the stirring rod, keep the stirring rod rotating at 200r / min, pressurize the container to 1.5atm and heat it to 80°C, spray the atomized first concentrate...

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PUM

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Abstract

The invention discloses a wastewater treatment method for p-nitrochlorobenzene routes of para-esters, and belongs to the field of para-ester wastewater treatment. The treatment method includes performing primary concentration and secondary concentration on condensed wastewater. The primary concentration step includes injecting nitrogen into the condensed wastewater while continuously stirring withthe presence of a dewatering molecular sieve to complete a first dewatering stage, stopping injection, performing pressure-relief treatment to complete a second dewatering stage, stopping pressure relief, and performing pressurization treatment to complete a third dewatering stage to obtain a first concentrated solution. The second concentration step includes contacting the atomized first concentrated solution with a stirring rod while the stirring rod with the dewatering molecular sieve is rotated continuously, and collecting liquid to obtain a second concentrated solution. The dewatering molecular sieve comprises at least one or two of a 3A molecular sieve and a 4A molecular sieve. The wastewater treatment method has the advantages that DMF (dimethyl formamide) in the condensed wastewater can be recycled effectively, difficulty of the treatment process is lowered, energy consumption is low, and production cost and pollution are reduced.

Description

technical field [0001] The invention relates to the field of waste water treatment of para-esters, and in particular to a waste water treatment method of the p-nitrochlorobenzene route of para-esters. Background technique [0002] Para-ester, alias p-β-sulfone ethylsulfoneaniline, vinylsulfone sulfate, 4-sulfone ethylsulfoneaniline, p-β-hydroxyethylsulfoneaniline sulfate, p-β-hydroxyethylsulfoneaniline sulfate . Para-ester is an important intermediate of reactive dyes, and is used to synthesize reactive dyes containing vinylsulfone groups such as EF type, KN type, M / KM type, and ME type. [0003] The para-ester is a temporary water-soluble group, which can not only improve the solubility of the dye when it is applied, but also the reactive dye containing hydroxyethyl sulfone sulfate group has a low affinity to the fiber during dyeing, which may achieve the effect of level dyeing and generate Dye-fiber ether bond, ether bond has good acid resistance and thermal stability, w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28C02F103/36
CPCC02F1/281C02F2103/36C02F2209/02C02F2209/03C02F2301/08
Inventor 闫玲玲魏艳军蔡红新魏宗良徐周庆
Owner 新乡市锦源化工有限公司