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A method for treating pyridine wastewater

A treatment method, pyridine technology, applied in natural water treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve the problems of high cost of pyridine production wastewater incineration treatment, environmental pollution, high treatment cost, etc.

Active Publication Date: 2017-04-19
河北美邦工程科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for treating pyridine wastewater, which solves the problems of high cost of pyridine production wastewater incineration and environmental pollution, and simultaneously recovers ammonia, pyridine and derivatives, and realizes emission reduction and efficiency enhancement
In order to solve the problems of high processing cost and environmental pollution caused by traditional incineration, the present invention proposes to add a low-vacuum flash stripping device after the pyridine production wastewater device to effectively separate the organic phase aqueous solution and ammonia gas, and obtain ammonia water through forced absorption of gas phase ammonia ; The organic aqueous solution is subjected to adsorption and desorption processes through a fixed bed adsorption device to obtain colorless water, which can be discharged up to the standard after being treated by a conventional biochemical sewage treatment device. Pyridine and its derivatives, returned to the original system and effectively separated and utilized through rectification

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  • A method for treating pyridine wastewater
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Effect test

Embodiment 1

[0030] (1) Low vacuum flash stripping

[0031] In the process of high-temperature synthesis of pyridine using acetaldehyde + formaldehyde + liquid ammonia, the red pyridine waste water discharged from the pyridine extraction tower with a COD of 25000mg / L, consisting of 5000ppm pyridine / 3-picoline, 5% ammonia and water, is pressurized Pumped into a low-vacuum flash stripping device for separation, the pressure was controlled at 0.1 MPa, and the temperature was 95°C to obtain gas-phase ammonia and liquid-phase pyridine and 3-picoline solutions with a pH of 9.5;

[0032] (2) gas phase absorption

[0033] The gas phase ammonia obtained in step (1) is sent to the absorption tower for absorption, the pressure in the tower is controlled to 0.03MPa, the temperature is 20°C, and water is used as the absorbent to obtain ammonia water, which is reused in the pyridine production process;

[0034] (3) Fixed bed adsorption

[0035] The liquid phase pyridine and 3-picoline solution obtaine...

Embodiment 2

[0042] (1) Low vacuum flash stripping

[0043] In the process of high-temperature synthesis of pyridine using acetaldehyde + formaldehyde + liquid ammonia, the red pyridine waste water discharged from the pyridine extraction tower with a COD of 27000mg / L, consisting of 6000ppm pyridine, 3-picoline, 6% ammonia and water, is pressurized Pumped into a low-vacuum flash stripping device for separation, the control pressure of the atomization chamber is 0.01MPa, and the temperature is 80°C to obtain gas-phase ammonia and liquid-phase pyridine and 3-picoline solutions with a pH of 8.0;

[0044] (2) gas phase absorption

[0045] The gas phase ammonia obtained in the step (1) is sent to the absorption tower for absorption, the 0.05MPa in the tower is controlled, the temperature is controlled at 25°C, and water is used as the absorbent to obtain ammonia water, which is reused in the pyridine production process;

[0046] (3) Fixed bed adsorption

[0047] The liquid phase pyridine / 3-pic...

Embodiment 3

[0054] (1) Low vacuum flash stripping

[0055] In the process of high-temperature synthesis of pyridine using acetaldehyde + formaldehyde + liquid ammonia, the red pyridine wastewater discharged from the pyridine extraction tower with a COD of 29000mg / L, consisting of 7000ppm pyridine, 3-picoline, 5.5% ammonia and water, is pressurized Pumped into a low-vacuum flash stripping device for separation, the control pressure of the atomization chamber is 0.02MPa, and the temperature is 90°C to obtain gas-phase ammonia and liquid-phase pyridine and 3-picoline solutions with a pH of 7;

[0056] (2) gas phase absorption

[0057] The gas phase ammonia obtained in the step (1) is sent to the absorption tower for absorption, the pressure in the tower is controlled to 0.02MPa, the temperature is controlled at 20°C, and water is used as the absorbent to obtain ammonia water, which is reused in the pyridine production process;

[0058] (3) Fixed bed adsorption

[0059] The liquid phase pyr...

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Abstract

The invention discloses a method for treating pyridine wastewater, which comprises the following steps: pyridine wastewater, which is discharged from a pyridine extraction tower in an acetaldehyde+formaldehyde+liquid ammonia high-temperature pyridine synthesis technique, is subjected to low-vacuum flash distillation gas stripping, gas-phase absorption, fixed bed adsorption, desorption, distillation and other steps to separate and recover ammonia, pyridine and 3-methylpyridine in the pyridine wastewater, and the colorless water is subjected to biochemical treatment and discharged after reaching the standard. The method solves the problems of discharge of incinerator exhaust NOX, high incineration cost and carbon discharge due to abundant pyridine and derivatives in the wastewater incineration process in the pyridine production technique, effectively recovers the pyridine and derivatives, saves the cost, and lowers the pollution.

Description

technical field [0001] The invention relates to a method for treating production waste water, in particular to a method for treating process waste water produced by synthesizing pyridine from acetaldehyde+formaldehyde+ammonia. [0002] technical background [0003] Pyridine is an important chemical, pharmaceutical, and pesticide raw material widely used. In addition to being used as a solvent, it can also be used as a denaturant, a dyeing aid, and a series of synthetic products including medicines, disinfectants, dyes, and food seasonings. , Adhesives, explosives and other initiators or catalysts. Pyridine can also be used as a corrosion inhibitor to inhibit the corrosion of metals. In the prior art, most manufacturers use acetaldehyde + formaldehyde + liquid ammonia to synthesize pyridine at high temperature, followed by extraction and rectification. Due to the simple principle of the production process of pyridine and complex process control, the excess of ammonia in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C07D213/16C01C1/10C02F103/36
Inventor 吕志
Owner 河北美邦工程科技股份有限公司
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