Liquid-state hydrocarbon waste alkali liquid treatment method

A technology of liquid hydrocarbon waste lye and treatment method, which is applied in chemical instruments and methods, flotation water/sewage treatment, neutralized water/sewage treatment, etc. Efficiency-enhancing effect

Active Publication Date: 2015-05-13
SINOPEC DALIAN RES INST OF PETROLEUM & PETROCHEMICALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method has the advantage of high treatment efficiency, it needs to consume a large amount of tap water in the dilution process; and the waste lye will emit a large amount of hydrogen sulfide gas during the dilution and neutralization process, which seriously pollutes the environment.

Method used

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Embodiment 1

[0032] A stream of liquid hydrocarbon waste lye, its COD is 298000mg / L, S 2-The concentration is 37500mg / l, the concentration of phenol is 23850mg / L, the concentration of sodium carbonate is 25670mg / L, the concentration of sodium hydroxide is 0.5wt%, and the concentration of oil is 190mg / L. Adopt the inventive method to process under the following conditions:

[0033] (1) Air flotation degreasing: Air is introduced into the waste lye to generate air bubbles in the waste lye, and a small amount of light oil entrained in the waste lye sticks to the air bubbles, and is removed by floating on the water surface with the gas. The oil content in the waste lye drops to 17mg / L.

[0034] (2) High-temperature wet oxidation treatment: the reaction temperature of wet oxidation treatment is 290°C, the reaction pressure is 12.0MPa, and the reaction residence time is 60min. Add dilution water and the 50wt% sodium hydroxide solution obtained in step (4) to the solution. Add 1.7m3 of diluted...

Embodiment 2

[0039] A stream of liquid hydrocarbon waste lye, its COD is 367600mg / L, S 2- The concentration is 72900mg / l, the concentration of phenol is 43820mg / L, the concentration of sodium carbonate is 31271mg / L, the concentration of sodium hydroxide is 0.6wt%, and the concentration of oil is 210mg / L. Adopt the inventive method to process under the following conditions:

[0040] (1) Air flotation degreasing: Air is introduced into the waste lye to generate air bubbles in the waste lye, and a small amount of light oil entrained in the waste lye sticks to the air bubbles, and is removed by floating on the water surface with the gas. The oil content in the waste lye drops to 20mg / L.

[0041] (2) High-temperature wet oxidation treatment: the reaction temperature of wet oxidation treatment is 290°C, the reaction pressure is 12.0MPa, and the reaction residence time is 60min. Dilution water and 40 wt% sodium hydroxide solution were added to the solution. Add 2.45m3 of diluted water and 550L...

Embodiment 3

[0046] A stream of liquid hydrocarbon waste lye, its COD is 256800mg / L, S 2- The concentration is 29400mg / L, the concentration of phenol is 19860mg / L, the concentration of sodium carbonate is 21750mg / L, the concentration of sodium hydroxide is 0.6wt%, and the concentration of oil is 176mg / L. Adopt the inventive method to process under the following conditions:

[0047] (1) Air flotation degreasing: Air is introduced into the waste lye to generate air bubbles in the waste lye, and a small amount of light oil entrained in the waste lye sticks to the air bubbles, and is removed by floating on the water surface with the gas. The oil content in the waste lye drops to 13mg / L.

[0048] (2) High-temperature wet oxidation treatment: the reaction temperature of wet oxidation treatment is 290°C, the reaction pressure is 12.0MPa, and the reaction residence time is 60min. Dilution water and 50 wt% sodium hydroxide solution were added to the solution. Add 1.7 m3 of dilution water and 300...

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Abstract

The present invention discloses a liquid-state hydrocarbon waste alkali liquid treatment method, which comprises: removing oil substances from a waste alkali liquid, carrying out a high temperature wet oxidation treatment, adjusting the alkali concentration of the waste alkali liquid, recovering sodium carbonate, carrying out evaporation concentration so as to further improve the alkali concentration in the solution and recover the remaining sodium salt, and reusing the treated waste alkali liquid. With the method of the present invention, the COD and the sulfides in the waste alkali liquid can be efficiently removed, the concentration difference of the sodium carbonate and the sodium sulfate in the solution being subjected to the high temperature wet oxidation treatment is utilized to recover the sodium salt in two times, the sodium hydroxide solution obtained after treating the waste alkali liquid is recycled, and the zero emission of the liquid-state hydrocarbon waste alkali liquid is achieved.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a treatment method for liquid hydrocarbon waste lye. Background technique [0002] In my country's refineries, many oil refining processes use alkali refining process, that is, using NaOH solution to absorb H 2 S. Alkaline cleaning of oil products. In this process, waste lye containing a large amount of pollutants is produced, including liquid hydrocarbon waste lye, gasoline, especially catalytic gasoline waste lye, diesel waste lye. Liquid hydrocarbon waste lye is a kind of oil refining waste lye. Although the discharge of liquid hydrocarbon waste lye is not large, the concentration of pollutants contained in it is high and the toxicity is high. The COD concentration in this type of waste lye is as high as hundreds of thousands mg / L, the sulfide content is as high as tens of thousands mg / L, and the phenol content is relatively high. How to better deal with this ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01D7/00C01D5/00C02F1/24C02F1/72C02F1/66
Inventor 周彤邓德刚许莹秦丽姣
Owner SINOPEC DALIAN RES INST OF PETROLEUM & PETROCHEMICALS CO LTD
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