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Recycling treatment method for p-aminophenol production waste water

A technology for p-aminophenol and waste water production, applied in water/sewage treatment, natural water treatment, chemical instruments and methods, etc., can solve the problems of inability to recover p-nitrophenol, incomplete recovery of nitrophenol, and high energy consumption for evaporation , to achieve the effect of resource recycling, industrial application, and simple operation of the treatment process

Inactive Publication Date: 2017-09-01
ZHEJIANG QICAI ECO TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the catalytic oxidation degradation technology cannot recover useful substances in the wastewater, and needs to add oxidants, and the cost is high; the resin adsorption-evaporative desalination technology cannot recover p-nitrophenol in iron sludge, the recovery of p-nitrophenol is not complete, and evaporation can High consumption, the obtained salt is hazardous waste

Method used

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  • Recycling treatment method for p-aminophenol production waste water

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The waste water is produced in the process of p-nitrochlorobenzene prepared by alkali hydrolysis, acidification and crystallization to obtain p-aminophenol products, and then reduced by iron powder. The waste water is yellow, and the TOC is 2033mg / L, [H + ] is 0.4mol / L, the iron ion concentration is 924mg / L, and the concentration of p-nitrophenol is 2000mg / L.

[0050] (1) Add sodium hydroxide solution (30w.t.%) to p-nitrophenol wastewater to carry out neutralization and flocculation, adjust the wastewater pH value to 8.5, add 0.1% powdered activated carbon, stir, flocculate, filter, and the iron ion concentration in the filtrate Reduced to 18mg / L, the wastewater TOC dropped to 1553mg / L, the removal rate was 30.9%, and the generated filter residue accounted for 1.38% of the wastewater quality;

[0051] (2) Utilize (50 times solid waste quality) (60 ℃) hot water to beat and filter the filter residue, and then use concentrated hydrochloric acid (36w.t.%) to adjust the pH v...

Embodiment 2

[0058] The waste water is produced in the process of p-nitrochlorobenzene prepared by alkali hydrolysis, acidification and crystallization to obtain p-aminophenol products, and then reduced by iron powder. The waste water is yellow, and the TOC is 2420mg / L, [H + ] is 0.24mol / L, the iron ion concentration is 864mg / L, and the concentration of p-nitrophenol is 2109mg / L.

[0059] (1) Add sodium hydroxide solution (30w.t.%) to p-nitrophenol wastewater to carry out neutralization and flocculation, adjust the wastewater pH value to 8.8, add 0.2% powdered activated carbon, stir, flocculate, filter, and the iron ion concentration in the filtrate Reduced to 15mg / L, the wastewater TOC dropped to 1672.22mg / L, the removal rate was 30.9%, and the resulting filter residue accounted for 1.41% of the wastewater quality;

[0060] (2) Utilize (50 times solid waste quality) (60 ℃) hot water to beat and filter the filter residue, and then use concentrated hydrochloric acid (36w.t.%) to adjust the ...

Embodiment 3

[0067] The waste water is produced in the process of p-nitrochlorobenzene prepared by alkali hydrolysis, acidification, and crystallization to obtain p-aminophenol products through iron powder reduction. The waste water is yellow, and the TOC is 1862mg / L, [H + ] is 0.52mol / L, the iron ion concentration is 986mg / L, and the concentration of p-nitrophenol is 1833mg / L.

[0068] (1) Add sodium hydroxide solution (30w.t.%) to p-nitrophenol wastewater to carry out neutralization and flocculation, adjust the wastewater pH value to 9, add 0.1% powdered activated carbon, stir, flocculate, filter, and the iron ion concentration in the filtrate Reduced to 15mg / L, the wastewater TOC dropped to 1340.64mg / L, the removal rate was 28%, and the resulting filter residue accounted for 1.39% of the wastewater quality;

[0069] (2) Utilize (50 times solid waste quality) (60 ℃) hot water to beat and filter the filter residue, and then use concentrated hydrochloric acid (36w.t.%) to adjust the pH val...

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Abstract

The invention discloses a recycling treatment method for p-aminophenol production waste water, which comprises the followings of: (1) pretreatment, i.e., regulating the p-aminophenol production waste water to a neutral or weakly-alkaline state, adding a coagulant to carry out coagulation, and filtering to obtain filtrate I and filter residues; (2) primary recovery of p-nitrophenol, i.e., washing the filter residues with hot water, regulating washing effluent to an acid state and cooling, filtering to obtain filtrate II and p-nitrophenol crystals, recovering the p-nitrophenol, and recycling the filtrate II for washing the filter residues; (3) secondary recovery of the p-nitrophenol, i.e., regulating pH of the filtrate I to 0.5 to 4, and recovering the p-nitrophenol by adopting resin absorption; (4) post treatment, i.e., carrying out post processing on resin absorption effluent to recover inorganic salt. The treatment process disclosed by the invention takes neutralization flocculation-p-nitrophenol primary recovery-p-nitrophenol secondary recovery-post treatment as a main line, implements recycling recovery treatment of waste water and implements zero emission, and secondary pollution is obviously reduced.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment, in particular to a resource treatment method for p-aminophenol production wastewater. Background technique [0002] p-aminophenol, also known as p-hydroxyaniline, 4-aminophenol, or PAP for short, is an important organic intermediate widely used in medicine, fuel and organic synthesis. In the pharmaceutical industry, p-aminophenol is mainly used in the synthesis of paracetamol, clofenac, vitamin B1, compound nicotinamide, etc. It is also used in rubber, fuel, feed, petroleum and photographic industries. [0003] p-Aminophenol was originally made from p-nitrosophenol by reducing it with tin powder in an acidic medium, and later changed to the method of reducing p-nitrophenol or p-nitrochlorobenzene with iron powder. It is still widely used all over the world. The process for preparing p-aminophenol by reduction of p-nitrophenol iron powder is as follows: adding sodium hydroxide to p...

Claims

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Application Information

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IPC IPC(8): C02F9/08C07C201/16C07C205/22C02F101/34C02F101/38C02F103/36
CPCC02F9/00C02F1/285C02F1/32C02F1/46104C02F1/5236C02F1/5245C02F1/66C02F1/722C02F1/725C02F1/76C02F2001/5218C02F2101/345C02F2101/38C02F2103/36C07C201/16C07C205/22
Inventor 林金华吴勇前郝震简卫张静张宁
Owner ZHEJIANG QICAI ECO TECH CO LTD
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