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Benzene hydrogenation wastewater desulfurization and deamination treatment method aiming at improving deamination and treatment device applying same

A technology for hydrogenation of benzene and waste water, applied in the direction of heating water/sewage treatment, degassed water/sewage treatment, multi-stage water treatment, etc., can solve the problems of affecting the quality of ammonia water, complicated operation, and unstable operation of deamination process, etc. Achieve the effects of simplifying the process flow, improving the quality, reducing the difficulty of process operation and energy consumption

Inactive Publication Date: 2016-08-24
TANGSHAN XUYANG CHEM IND CO LTD
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if you choose to produce ammonia water, since the ammonia gas passes through the three-stage partial condenser, there will still be a small amount of hydrogen sulfide gas in the ammonia gas, so there will be a small amount of sulfur ions in the ammonia water, which will affect the quality of the ammonia water
At the same time, due to the complicated operation of the three-stage fractional condensation process, the operation of the entire deamination process is unstable

Method used

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  • Benzene hydrogenation wastewater desulfurization and deamination treatment method aiming at improving deamination and treatment device applying same

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Effect test

Embodiment 1

[0042] The desulfurization and deammonification treatment of embodiment 1 benzene hydrogenation waste water

[0043] refer to figure 1, according to the desulfurization and deamination treatment method of benzene hydrogenation wastewater of the present invention, the wastewater from the crude benzene hydrogenation process is heated to 85 to 92 °C after passing through the raw material preheater 1 and the heat exchanger 2, and then enters the deacidification tower 3 for heating Separation, the temperature at the bottom of the tower is 158°C, the temperature at the top of the tower is 60 to 75°C, the hydrogen sulfide is discharged from the top of the tower, and the deacidification still liquid is obtained at the bottom of the tower; the deacidification still liquid is passed through the heat exchanger 2 and the aforementioned crude oil After heat exchange, the wastewater from the benzene hydrogenation process is mixed with NaOH with a concentration of 20% to 40% from the lye tan...

Embodiment 2

[0044] The detection of the ammoniacal liquor that embodiment 2 energy consumption detects and prepares

[0045] The processing method of the present invention can handle sulfide content is 10000~30000mg / l, NH 3 -Wastewater with N content of 6000~20000mg / l, the treatment capacity is 6-11m 3 / h, after treatment (at the bottom of the deamination tower), the ammonia content in the waste water is ≤150mg / l, and the sulfide is ≤50mg / l, and additional 18%-20% ammonia water can be obtained, which can be directly used as other industrial raw materials;

[0046] The method requires 0.33-0.35 tons of steam to treat one ton of waste water, which can save a lot of energy compared with the conventional method; and in the method of the present invention, the acid gas ammonia at the top of the deacidification tower is ≤ 2%, and the water vapor is ≤ 2% , that is, the discharge of three wastes is greatly reduced, and the CODcr of the waste water from the deammonization tower is less than or e...

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Abstract

The invention relates to a benzene hydrogenation wastewater desulfurization and deamination treatment method and device. Alkaline liquid is added before deacidification tower kettle liquid enters a deamination tower to fix sulfur ions left in wastewater after desulfurization, so that influence on quality of ammonia water or liquid ammonia due to the fact that the sulfur ions left in the wastewater enters ammonia in a form of hydrogen sulfide in the process of ammonia distilling is avoided. On the basis of a petrochemical desulfurization and deamination process, the whole desulfurization and deamination process is simplified, operation difficulty is lowered, and equipment investment is saved.

Description

technical field [0001] The invention belongs to the field of waste water treatment and environmental protection, and in particular relates to a pretreatment method for desulfurization and deammonification of benzene hydrogenation waste water which is improved for the deamination section and a treatment device using the method. Background technique [0002] The wastewater from the crude benzene hydrogenation process has the characteristics of high ammonia nitrogen, high COD, high sulfide, and low flow rate. This kind of wastewater must be pretreated to reduce ammonia nitrogen and sulfide to a certain concentration (ammonia nitrogen ≤ 150mg / L, sulfide ≤ 50mg / L) before it can enter the biochemical system of the sewage station. Otherwise, the microorganisms in the biochemical system will be poisoned, causing the entire biochemical system to collapse. [0003] For benzene hydrogenation process wastewater with high ammonia nitrogen, high COD, and high sulfide wastewater, the doub...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
CPCC02F1/04C02F1/20C02F1/66C02F9/00C02F2301/08
Inventor 李拥军薛金龙于洪锋田红王东王健
Owner TANGSHAN XUYANG CHEM IND CO LTD
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