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Pollution-free processing method of sulfur-containing waste alkaline solution

A technology of harmless treatment and treatment method, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as unsuitable use and secondary pollution, and reduce operation The effect of energy consumption, volume reduction, and easy circulation transportation

Active Publication Date: 2014-10-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method will produce sulfur oxides during the roasting regeneration process of precipitation, and sulfur oxides are a kind of air pollutants, so secondary pollution is generated, so it is not suitable to use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) After the waste caustic liquor discharged from the pyrolysis gas alkali washing tower of an ethylene plant is extracted by pyrolysis gasoline, the oil content drops below 40mg / L.

[0027] (2) Take 1000ml of the waste lye after degreasing and put it into the reactor (S 2- The concentration is 2285mg / L), and then add copper sulfate solution (the mass of Cu is 4070mg) at a ratio of 0.9 times the stoichiometric amount while stirring, and continue to stir and react for 30min. After the reaction stopped, let it stand for 1 hour, skim off 900 ml of the supernatant, and collect the precipitate. Analysis of the supernatant, S 2- The concentration is 38mg / L.

[0028] (3) Take 500ml of the above-mentioned supernatant after preliminary desulfurization, add 0.5ml of 30% (ω%) hydrogen peroxide solution, stir and react for 60min, analyze the supernatant, S 2- The concentration was reduced to 0.5mg / L.

[0029] (4) Take the precipitate collected in the above process and wash it ...

Embodiment 2

[0032]Under the condition of full stirring, add ZnSO to the sulfur-containing waste alkali liquor after oil removal 4 Desulfurization agent, the amount of desulfurization agent added is its combination with ZnSO 4 The stoichiometric amount of reaction is 1.0 times, and after the reaction is finished, solid-liquid separation is carried out by centrifugation, sedimentation and filtration.

[0033] Reaction temperature: 30°C; Reaction time: 120min; Stirring speed: 50r / min.

[0034] Use desalted water to prepare the resulting reaction precipitate or filter cake into a slurry with a concentration of 10% by weight, and send it to a pressurized reactor for wet oxidation regeneration. The solution obtained after the reaction is regenerated ZnSO 4 The desulfurizer solution is recycled after filtering to remove solid impurities.

[0035] The pH of the slurry is 4; the reaction temperature is 200°C; the oxygen partial pressure in the pressurized reactor is 6MPa.

[0036] Add hydrogen ...

Embodiment 3

[0039] Under the condition of full stirring, add NiSO to the sulfur-containing waste alkali liquor after oil removal 4 Desulfurization agent, the amount of desulfurization agent added is 0.8 times the stoichiometric amount of the reaction with sulfide, after the reaction is completed, the solid-liquid separation is carried out by centrifugation, sedimentation, filtration and other methods.

[0040] The preliminary desulfurization process by precipitation method is carried out according to the following conditions: reaction temperature: 0°C; reaction time: 120min; stirring speed: 200r / min.

[0041] The reaction sediment or filter cake is prepared into a slurry with a concentration of 20% (weight percentage) by desalinated water, and sent to an air-lift pressurized internal circulation reactor for wet oxidation regeneration. The solution obtained after the reaction is regenerated NiSO 4 The desulfurizer solution is recycled after filtering to remove solid impurities.

[0042] ...

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PUM

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Abstract

The invention relates to a pollution-free processing method of sulfur-containing waste alkaline solution. The method comprises the following steps: removing the floating oil, dispersed oil, and emulsified oil in the sulfur-containing waste alkaline solution through steps of solvent extraction, agglomeration, vortex separation, and mechanical oil removing; adding a metal sulfate desulfurizer to carry out reactions, carrying out solid-liquid separation through centrifugation, settlement, and filtration; adding a hydrogen peroxide solution into the desulfurized waste alkaline solution to carry out reactions; adding desalinated water into the reaction precipitate or filtrate cake to prepare slurry, and transporting the slurry into a pressurized reactor to carry out wet oxidation regeneration. After the wet oxidation regeneration, the obtained metal sulfate desulfurizer can be reused, the obtained desulfurized waste alkaline solution can be used to neutralize acidic wastewater, or the desulfurized waste alkaline solution can be neutralized, and then transported to a sewage processing factory to mix with other sewage to carry out bio-treatment so as to meet the discharge standards. The desulfurization is carried out at a common temperature, thus the energy consumption is reduced, moreover, the volume of the waste alkaline solution needed to be processed by the wet oxidation treatment is reduced, and the secondary pollution caused by the volatilization of organic substances during the process of direct wet oxidation treatment of sulfur-containing waste alkaline solution is avoided.

Description

Technical field: [0001] The invention relates to a harmless treatment method for sulfur-containing waste lye. Background technique: [0002] In the process of oil and gas processing, refining and chemical production, the alkaline solution washing method is generally used to remove CO 2 、H 2 S and other acidic components, resulting in a large amount of sulfur-containing waste lye. For example, in the process of ethylene production, the method of washing with sodium hydroxide solution is widely used to remove CO in cracked gas. 2 、H 2 S and other acid gases. During the alkali washing process, on the one hand, due to the consumption of the reaction, and on the other hand, due to the dilution of the washing water, the concentration of NaOH in the circulating lye of the alkali washing tower is continuously reduced. In order to maintain the reactivity of the alkali cleaning solution, it is necessary to continuously replenish fresh alkali, and at the same time discharge a part...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
Inventor 杜龙弟赵兴龙马克存徐澎波刘永和程连谱王薇何昌洪张春燕
Owner PETROCHINA CO LTD
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