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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  • Summary
  • 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

Method used

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  • Recycling treatment method for p-aminophenol production waste water

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0048] Example 1

[0049] The wastewater is produced during the process of preparing p-nitrophenol through alkaline hydrolysis, acidification, and crystallization of p-nitrochlorobenzene, and then reducing the iron powder to obtain p-aminophenol product. The wastewater is yellow, and the TOC is 2033mg / L, [H + ] Is 0.4mol / L, the iron ion concentration is 924mg / L, and the p-nitrophenol concentration is 2000mg / L.

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

[0051] (2) Use (50 times the mass of solid waste) (60℃) hot water to pulp and filter the filter residue, then use concentrated hydrochloric acid (36w.t.%)...

Example Embodiment

[0057] Example 2

[0058] Waste water is p-nitrochlorobenzene produced in the process of preparing p-nitrophenol through alkaline hydrolysis, acidification, and crystallization, and then reducing iron powder to obtain p-aminophenol product. The wastewater is yellow, with a TOC of 2420mg / L, [H + ] Is 0.24mol / L, the iron ion concentration is 864mg / L, and the p-nitrophenol concentration is 2109mg / L.

[0059] (1) Add sodium hydroxide solution (30w.t.%) to the p-nitrophenol wastewater for neutralization and flocculation, adjust the pH of the wastewater to 8.8, add 0.2% powdered activated carbon, stir, flocculate, and filter, and the iron ion concentration in the filtrate Reduce to 15mg / L, waste water TOC is reduced to 1672.22mg / L, removal rate is 30.9%, and the generated filter residue accounts for 1.41% of waste water quality;

[0060] (2) Use (50 times the mass of solid waste) (60℃) hot water to pulp and filter the filter residue, then use concentrated hydrochloric acid (36w.t.%) to adj...

Example Embodiment

[0066] Example 3

[0067] Waste water is p-nitrochlorobenzene produced in the process of preparing p-nitrophenol through alkaline hydrolysis, acidification and crystallization, and then reducing iron powder to obtain p-aminophenol product. Waste water is yellow, TOC is 1862mg / L, [H + ] Is 0.52mol / L, the iron ion concentration is 986mg / L, and the p-nitrophenol concentration is 1833mg / L.

[0068] (1) Add sodium hydroxide solution (30w.t.%) to the p-nitrophenol wastewater for neutralization and flocculation, adjust the pH of the wastewater to 9, add 0.1% powdered activated carbon, stir, flocculate, and filter, and the iron ion concentration in the filtrate Reduce to 15mg / L, waste water TOC is reduced to 1340.64mg / L, removal rate is 28%, and the generated filter residue accounts for 1.39% of waste water quality;

[0069] (2) Use (50 times the mass of solid waste) (60℃) hot water to pulp and filter the filter residue, then use concentrated hydrochloric acid (36w.t.%) to adjust the pH valu...

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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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