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Treatment method of epoxy chloropropane production wastewater

A technology for epichlorohydrin and waste water production, which is applied in oxidation water/sewage treatment, water/sewage treatment, natural water treatment and other directions, and can solve the problems of inorganic salt pollution, difficulty in meeting discharge requirements, and inability to oxidatively degrade organic matter. Realize the effect of recycling, low disposal cost and long service life

Active Publication Date: 2018-11-13
山东沾化金嘉利化工科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current treatment method of epichlorohydrin production wastewater, since the organic matter cannot be completely oxidized and degraded, the separated water often contains a certain amount of organic matter, which is difficult to meet the discharge requirements, and the separated salt is also doped with a certain amount of organic matter. lead to contamination of the separated inorganic salts

Method used

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  • Treatment method of epoxy chloropropane production wastewater
  • Treatment method of epoxy chloropropane production wastewater
  • Treatment method of epoxy chloropropane production wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Add the waste water from the production of epichlorohydrin into the waste water storage tank, add the catalytic oxidation aid anhydrous cobalt chloride and stir evenly, then preheat, and after preheating, enter the porous solid catalyst Nd 2 o 5 In the oxidation reactor of / SBA-15, it reacts with the oxidant, and controls the temperature, pressure, flow rate and residence time of the reaction; after the reaction is completed, samples are taken at the outlet of the oxidation reactor for analysis, and then the treated organic wastewater enters the flash evaporation The temperature is lowered, and the solid salt is separated by centrifugation through the desalination filter. The concentrated liquid after centrifugation is returned to the filter device, and then enters the preheating device, which is applied to the process to realize the recycling of catalytic oxidation additives. The treated organic wastewater was measured for COD and calculated for its removal rate, and a...

Embodiment 2

[0045] The process parameters are:

[0046] (1) NaCl content is 15.0wt.% in the epichlorohydrin production wastewater, and COD is 5000mg / L; After adding anhydrous cobalt chloride in the epichlorohydrin production wastewater, Co 2+ The molar concentration in epichlorohydrin production wastewater is 0.3mmol / L; the preheating temperature is 150°C; the reaction temperature is 150°C, the reaction pressure is 5.0MPa, the residence time is 60min, the flow rate of wastewater is 16.7ml / min, and the oxidant for air;

[0047] (2) After testing, the removal rate of COD in the treated organic wastewater is 97.75%, and the recovery rate of NaCl is 99.1%. After the solid salt is dried, it is analyzed, and its quality index is: NaCl: 98.2wt.%; Co 2+ : 1.5 μg / g; TOC: 9.3 μg / g.

Embodiment 3

[0049] The process parameters are:

[0050] (1) CaCl in epichlorohydrin production wastewater 2 The content is 14.0wt.%, and the COD is 4500mg / L; after adding anhydrous cobalt chloride to the epichlorohydrin production wastewater, Co 2+ The molar concentration in the epichlorohydrin production wastewater is 0.2mmol / L; the preheating temperature is 250°C; the reaction temperature is 250°C, the reaction pressure is 8.0MPa, the residence time is 10min, the wastewater flow rate is 100ml / min, and the oxidant is oxygen;

[0051] (2) After testing, the removal rate of COD in the treated organic wastewater is 97.31%, and CaCl 2 The recovery rate is 99.3%, and the solid salt is analyzed after drying, and its quality index is: CaCl 2 : 98.3wt.%; Co 2+ : 1.7 μg / g; TOC: 10.0 μg / g.

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Abstract

The invention belongs to the technical field of organic wastewater treatment, and specifically relates to a treatment method of epoxy chloropropane production wastewater. The treatment method comprises the following steps: mixing a catalytic oxidation assistant in the epoxy chloropropane production wastewater in advance, preheating, entering an oxidation reactor, and carrying out oxidation reaction with an oxidant, thus oxidizing organic matters in the epoxy chloropropane production wastewater into H2O, CO2 and HCl; carrying out flash evaporation and evaporation concentration on a reaction solution after reaction, and desalting. According to the treatment method disclosed by the invention, soluble cobalt salt can be combined with Nd2O5 / SBA-15, and a synergistic effect between the soluble cobalt salt and Nd2O5 / SBA-15 can be fully expressed, so that the organic matters in the wastewater can be quickly and deeply oxidized so as to be removed; the content of COD (Chemical Oxygen Demand) inorganic wastewater is greatly reduced, water and inorganic solid salt can be effectively separated, the content of the organic matters in the water and the inorganic solid salt is low, separated water can be recycled, and the inorganic solid salt can also be used as a byproduct.

Description

technical field [0001] The invention belongs to the technical field of organic wastewater treatment, and in particular relates to a treatment method for epichlorohydrin production wastewater. Background technique [0002] With the mass production of biodiesel, the production of its by-product crude glycerol also increases rapidly. The method of using glycerol to directly produce epichlorohydrin is more and more favored by people because of its advantages of less investment, low cost, simple production process, and clean production. However, this method will produce a large amount of high-salt organic wastewater containing glycerin in the production process of epichlorohydrin, the salt content is as high as 200g / L, and the COD content is as high as 3000mg / L or more. Due to the different saponification agents used, the types of salt in epichlorohydrin production wastewater are also different, mainly sodium chloride or calcium chloride. [0003] Chinese patent CN101318750A di...

Claims

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Application Information

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IPC IPC(8): C02F1/72C02F1/74C02F9/10C02F101/30C02F103/36
CPCC02F1/001C02F1/06C02F1/725C02F1/727C02F1/74C02F9/00C02F2101/30C02F2103/36
Inventor 王景华张广俊崔洪友刘勤学杨明刚王勇张远
Owner 山东沾化金嘉利化工科技有限公司
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