Processing method of epoxy chloropropane wastewater

A technology of epichlorohydrin and treatment method, which is applied in the directions of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., to achieve the effects of improving solubility, high removal rate and low treatment cost

Active Publication Date: 2016-06-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there is no economical, mature and reliable treatment method for calcium ions in epichlorohydrin wastewater

Method used

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  • Processing method of epoxy chloropropane wastewater

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Experimental program
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Effect test

Embodiment 1

[0023] A company produces a large amount of wastewater containing calcium ions in the production process of epichlorohydrin. The COD concentration is 1500mg / L, B / C: 0.20, calcium ion concentration: 7500mg / L, total salt content: 2.0%, temperature: 80°C. The method of the present invention is used for treatment. Firstly, excessive carbon dioxide gas is passed through the conventional microporous aeration method, and then part of the room temperature wastewater is quickly mixed with part of the raw wastewater to be treated, and the flow rate of the original wastewater is used to control the temperature of the mixed wastewater at 60~ 70°C, and rely on the system to automatically replenish sodium hydroxide to control the pH to 7~8 during the mixing reaction process. The calcium ion concentration in the treated wastewater is 1400mg / L, and the removal rate is 81.3%. Then add ammonium sulfate 2600mg / L to the wastewater to produce calcium sulfate precipitation and achieve the removal o...

Embodiment 2

[0025]A company produces a large amount of wastewater containing calcium ions in the production process of epichlorohydrin. The COD concentration is 1500 / L, B / C: 0.20, the calcium ion concentration is 7500mg / L, the total salt content: 2.0%, and the temperature: 80°C. The method of the present invention is used for treatment, and the method of dissolved air flotation is adopted. Part of the wastewater at room temperature dissolves a large amount of carbon dioxide after passing through the dissolved air tank. The working pressure of the dissolved air flotation is 0.4~0.6MPa, and then released into the subsequent air flotation tank. Quickly mix with the original wastewater, use the flow of the original wastewater to control the temperature of the mixed wastewater at 60~70°C, and rely on the system to automatically replenish sodium hydroxide to control the pH at 7~8 during the mixing reaction process, the treated wastewater The calcium ion concentration in the medium is 1000mg / L, ...

Embodiment 3

[0027] A company produces a large amount of wastewater containing calcium ions in the production process of epichlorohydrin. The COD concentration is 2500mg / L, B / C: 0.4, the calcium ion concentration is 9000mg / L, the total salt content: 3.0%, the temperature : 100°C. Adopt the method of the present invention to process, adopt the mode of dissolved air flotation, a large amount of carbon dioxide is dissolved after part room temperature waste water passes through dissolved air tank, the working pressure of dissolved air flotation is 0.6~0.8MPa, releases in the follow-up air flotation tank and with The raw wastewater is quickly mixed, using the flow of the raw wastewater to control the temperature of the mixed wastewater at 70-80°C, and relying on the system to automatically replenish potassium hydroxide to control the pH to 7-8 during the mixing reaction process, the treated wastewater The calcium ion concentration is 1300mg / L, and the removal rate is 85.6%. Then add a small am...

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Abstract

The invention discloses a processing method of epoxy chloropropane wastewater; the processing method includes the following contents: excess carbon dioxide gas is introduced into to-be-processed partially cooled raw wastewater, then the wastewater and a part of the raw wastewater are rapidly mixed, the temperature of the mixed wastewater is allowed to be greater than 60 DEG C, and calcium ions are precipitated and removed; ammonium sulfate is added in effluent, and calcium ions in the wastewater are further precipitated; and finally, the processed wastewater together with the precipitate is subjected to biochemical processing, and up-to-standard discharge of the wastewater is achieved. With adopting of introduction of excess carbon dioxide and utilization of raw wastewater alkalinity and waste heat, most of the calcium ions are precipitated and removed, then ammonium sulfate is added for further removing calcium, and finally, up-to-standard discharge of the wastewater is achieved by using biochemical processing; the processing method has the characteristics of simple process, high processing efficiency, and low processing cost.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a treatment method for epichlorohydrin wastewater. Background technique [0002] Epichlorohydrin is an important intermediate in organic synthesis, mainly used in the production of fine chemical products such as epoxy resin, synthetic glycerin, and chlorohydrin rubber. The high-temperature chlorination of propylene is a classic method for the industrial production of epichlorohydrin. The sewage generated in the process has the characteristics of large water volume, high salinity, and high calcium ion concentration. It is difficult and expensive to treat alone. At present, relevant enterprises basically adopt biochemical treatment process after mixing with wastewater from other production units, but this often leads to calcium deposition in the biochemical treatment system, which causes the increase of inorganic components in activated sludge and the deter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F9/14
Inventor 高会杰郭志华孙丹凤赵胜楠李宝忠
Owner CHINA PETROLEUM & CHEM CORP
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