Method for producing ionic membrane caustic soda by utilizing high-salt-content organic wastewater generated in epoxy chloropropane production process
A technology of epichlorohydrin and ion-exchange membrane caustic soda is applied in the fields of chemical engineering and technology, and can solve problems such as the beneficial effects of unexpressed process methods, and achieve the effects of simple operation and convenient industrial process.
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Embodiment 1
[0046] Advanced oxidation uses a combination of Fenton oxidation and UV photocatalytic oxidation.
[0047] Such as figure 1 and figure 2 As shown, take 2000ml of epichlorohydrin wastewater, wherein the sodium chloride content is 10%, the TOC content is 3700mg / L, adjust the pH to 6, heat to 55°C, keep the temperature constant, add 12.8g of ferrous chloride, and then divide into 3 ~4 times added H 2 o 2 , a total of 25g / L, reacted for 1h, and then filtered to remove Fenton iron sludge, and the filtered wastewater was transported to the ultraviolet photocatalytic reactor. 2 o 2 Catalytic oxidation was performed for 2 hours to obtain clean brine with a TOC of 2.8 mg / L after oxidation.
[0048] Pretreatment is to remove water-insoluble substances in high-salt wastewater through microporous filtration. The clean brine and industrial salt are mixed in a salt tank to obtain saturated crude brine; the saturated crude brine and the refining reactant are transported to the reactio...
Embodiment 2
[0052] The difference from Example 1 is that the advanced oxidation adopts the combination of Fenton oxidation and ozone oxidation.
[0053] Take 2000ml of epichlorohydrin waste water, wherein the sodium chloride content is 15%, the TOC content is 5600mg / L, adjust the pH to 6, heat to 60°C, keep the temperature constant, add 15g of ferrous chloride, pass ozone, and then divide 3 ~ 4 times join H 2 o 2 , a total of 40g / L, reacted for 4h, and then filtered to remove Fenton iron sludge to obtain clean brine with a TOC of 3.6mg / L after oxidation.
Embodiment 3
[0055] The difference from Example 1 is that the advanced oxidation adopts catalytic wet oxidation.
[0056] Get epichlorohydrin waste water 2000ml, wherein sodium chloride content is 20%, TOC content 9700mg / L, remove insoluble matter in the waste water through pretreatment, add the ferrous chloride of 1% by waste water weight, adjust pH to 5, Transport it to the primary catalytic wet oxidation reactor with a pump, oxidize for 1 hour at a temperature of 220°C and a pressure of 4.0MPa, and then transport it to the secondary catalytic wet oxidation reactor through a pipeline, and oxidize it at a temperature of 240°C and a pressure of 4.0MPa. After oxidizing for 1 hour, a clean brine with a TOC of 2.25 mg / L was obtained after oxidation.
[0057] The catalyst for catalytic wet oxidation is one or more of Fe, Cu, Ce, Mo, Mn, Ni, Co transition metal chlorides.
[0058] Catalytic wet oxidation is carried out in two series-connected oxidation towers, which have two layers of through-...
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