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A kind of treatment method of ethylene oxychlorination process vinyl chloride production wastewater

A technology of ethylene oxychlorination and treatment methods, which is applied in natural water treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc., to achieve stable and reliable treatment effects

Active Publication Date: 2015-12-09
李开明
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, most domestic manufacturers generally introduce other wastewater to dilute it, and then perform biochemical treatment, but the COD of the effluent is generally as high as 100-150mg / L, which can only meet the national secondary discharge standard

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  • A kind of treatment method of ethylene oxychlorination process vinyl chloride production wastewater

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Embodiment 1

[0026] What this embodiment handles is the VCM waste water discharged from the bottom of the quench tower tower of the ethylene oxychlorination unit, wherein COD Cr is 3680mg / L, and the copper ion concentration is 3.5mg / L. The specific treatment steps are as follows: the wastewater first adds alkali to adjust the pH value to 8-9, and after the flocculation and sedimentation in the primary sedimentation tank, the wastewater COD Cr Reduced to 3000-3300mg / L, the copper ion concentration is lower than 1mg / L. The effluent from the primary sedimentation tank enters the 2 / AC Catalyst Stripper. The waste water in the stripping tower is from top to bottom, and the mixed stripping medium of ozone and air is from bottom to top, and the ozone concentration is 25-30mg / L. Wastewater COD after the double effect of air stripping and ozone catalytic oxidation Cr down to 200-250mg / L. After heat exchange, the effluent water of the stripping tower enters the contact oxidation tank after the...

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Abstract

The invention discloses a treatment method of vinyl chloride production wastewater by virtue of an ethylene oxychlorination process. The method comprises the following steps: performing flocculation and sedimentation action on the wastewater, and removing pollutants in the wastewater; enabling the wastewater to enter a gas stripping tower, transferring volatile chlorinated hydrocarbon in the wastewater to a gas phase from an aqueous phase, blowing off volatile chlorinated hydrocarbon from the tower top, and introducing ozone to perform catalytic oxidation treatment on the pollutants in the wastewater under the action of a catalyst at the same time; conveying the wastewater into a biochemical pool, and removing organic pollutants by virtue of biochemical treatment; enabling the wastewater to enter a secondary sedimentation tank, performing solid-liquid separation to remove suspended sludge, and then entering a middle water tank; performing deep treatment on the wastewater in a micro-treatment unit, further removing the organic pollutants which are not easy to degrade in water, and finally discharging effluent on standard or recycling the effluent. The treatment method disclosed by the invention is suitable for the vinyl chloride production wastewater by virtue of the ethylene oxychlorination process and a balanced oxychlorination process, does not need to introduce other wastewater as dilution water, and can ensure that the effluent COD (chemical oxygen demand) is less than 50mg / L.

Description

technical field [0001] The invention belongs to the field of chemical waste water treatment, and in particular relates to a treatment method for waste water produced by ethylene oxychlorination method of vinyl chloride production. Background technique [0002] Vinyl chloride (VCM), also known as vinyl chloride, is a colorless, liquefied gas. VCM is an important monomer in polymer chemical industry and the most important raw material for the production of polyvinyl chloride resin (PVC). At present, there are two main routes for domestic VCM production, namely the calcium carbide acetylene method based on coal chemical industry and the ethylene method based on petrochemical industry. In the ethylene-based VCM production process, ethylene is first chlorinated or oxychlorinated to synthesize 1,2-dichloroethane (EDC), and then EDC is cracked to generate VCM monomer. [0003] The wastewater produced by the ethylene oxychlorination method of vinyl chloride mainly includes the was...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F103/36
Inventor 李开明
Owner 李开明
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