Method for treating sulfur-containing wastewater in gasoline refining process

A treatment method and technology for wastewater, which can be used in neutralization water/sewage treatment, natural water treatment, water/sewage treatment, etc., and can solve the problems of high operating costs, complex processes, and demanding requirements.

Active Publication Date: 2018-10-23
SHANDONG JINGBO PETROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Wet oxidation method refers to the oxidation of sulfide in wastewater to sulfate with air or other oxidants under high temperature and high pressure. This method has high requirements for equipment materials, continuous operation, complicated process, high one-time investment and high operating cost. Not suitable for promoting apps
The SBR method is a wastewater biological treatment technology that operates intermittently. Due to the poor sulfur resistance of the strains, the wastewater needs to be diluted before entering the SBR unit. The process is complex, demanding and costly.

Method used

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  • Method for treating sulfur-containing wastewater in gasoline refining process
  • Method for treating sulfur-containing wastewater in gasoline refining process
  • Method for treating sulfur-containing wastewater in gasoline refining process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] The sulfur-containing wastewater in the gasoline refining process is taken, and the pH value of the sulfur-containing wastewater is adjusted to 7 by sulfuric acid. After standing for stratification, the upper layer solution is removed, and the obtained lower layer solution is the preliminary treated wastewater.

[0067] Weigh two parts of 4g FCC balancer, bake at 400°C for 2 hours, and set aside. Add the spare two parts of FCC balancer to 100mL of sulfur-containing wastewater with different sulfide concentrations, and then add 5mL of hydrogen peroxide respectively, pass air into the obtained mixed solution, stir and mix at 65°C for 90min, and the stirring speed is 70r / min, and then stand still for 20 minutes to obtain desulfurization wastewater after solid-liquid separation.

[0068] Sampling was carried out to determine the sulfide in the water, and the removal rate of sulfide and the COD value in the treated wastewater were calculated. The results are shown in Table ...

Embodiment 2

[0072] The concentration of sulfide in sulfur-containing wastewater is 20000mg / L.

[0073] The sulfur-containing wastewater in the gasoline refining process is taken, and the pH value of the sulfur-containing wastewater is adjusted to 7 by sulfuric acid. After standing for stratification, the upper layer solution is removed, and the obtained lower layer solution is the preliminary treated wastewater.

[0074] Weigh 2g, 3g, 4g, 5g, 6g of FCC balancer respectively, after roasting at 400°C for 2h, add 100mL of the sulfur-containing waste water respectively, and then add 5mL of hydrogen peroxide respectively, and pass air into the obtained mixed solution, Stirring and mixing at 65° C. for 90 minutes at a stirring speed of 70 r / min, and then standing still for 20 minutes to obtain desulfurization wastewater after solid-liquid separation.

[0075] Sampling was carried out to determine the sulfide in the water, and the removal rate of sulfide and the COD value in the treated wastewat...

Embodiment 3

[0079] The concentration of sulfide in sulfur-containing wastewater is 20000mg / L.

[0080] The sulfur-containing wastewater in the gasoline refining process is taken, and the pH value of the sulfur-containing wastewater is adjusted to 7 by sulfuric acid. After standing for stratification, the upper layer solution is removed, and the obtained lower layer solution is the preliminary treated wastewater.

[0081] Weigh 4g of FCC balancer respectively, after roasting at 400°C for 2h, add 100mL of the sulfur-containing waste water respectively, then add 5mL, 6mL, 7mL, 8mL, 9mL of hydrogen peroxide respectively, and pass air into the obtained mixed solution, Stirring and mixing at 65° C. for 90 minutes at a stirring speed of 70 r / min, and then standing still for 20 minutes to obtain desulfurization wastewater after solid-liquid separation.

[0082] Sampling was carried out to determine the sulfide in the water, and the removal rate of sulfide and the COD value in the treated wastewat...

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Abstract

The invention discloses a method for treating sulfur-containing wastewater in a gasoline refining process. The sulfur-containing wastewater produced in the gasoline refining process is alkaline wastewater. By adjusting the pH value of the sulfur-containing wastewater to 6 to 7, the sulfur-containing wastewater is layered and through removal of the upper layer solution, the sodium phenolate in thesulfur-containing wastewater is removed. An oxidizing acid can directly oxidize S<2-> and HS<-> in wastewater into SO4<2->. The various valence sulfides are converted into single-valent sulfate ions so that the COD value is further reduced and the wastewater subjected to preliminary treatment is obtained. The wastewater subjected to preliminary treatment, a catalytic cracking balance agent and hydrogen peroxide are mixed. Through Ni, V and Fe on the catalytic cracking balance agent, under the auxiliary action of hydrogen peroxide, a catalytic oxidation reaction occurs at a certain temperatureto catalytically oxidize and decompose the residual organic matters in the wastewater so that COD is reduced. The method is simple, is easy to operate, has mild equipment demands, realizes a low costand is suitable for production promotion.

Description

technical field [0001] The invention relates to the technical field of treating sulfur-containing wastewater, in particular to a method for treating sulfur-containing wastewater in a gasoline refining process. Background technique [0002] The gasoline fraction produced by catalytic cracking is mixed with a certain concentration of lye in a gasoline-alkali mixer, and the phenols, hydrogen sulfide, mercaptan and other sulfur-containing compounds in the gasoline fraction are dissolved in the lye, and after many cycles Finally, settling separation is carried out, and the gasoline fraction is separated from the sulfur-containing waste caustic soda to produce sulfur-containing wastewater. [0003] Due to the gasoline fraction produced by catalytic cracking, there are many sulfur-containing substances without treatment, and the content of phenols is high. The sulfur-containing substances enter the sulfur-containing wastewater during the alkali washing process. If they are directly...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/10C02F101/30C02F103/36
CPCC02F1/66C02F1/72C02F1/722C02F1/725C02F2101/101C02F2101/30C02F2103/365
Inventor 代登峰栾波牛星
Owner SHANDONG JINGBO PETROCHEM
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