A kind of treatment method and device of high-salt wastewater produced by Pao
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A high-salt wastewater treatment device technology, applied in the treatment of high-salt wastewater, PAO production of high-salt organic wastewater treatment method and device field, to achieve the effect of increasing the vaporization rate, facilitating long-term stable operation, and improving the treatment effect
Active Publication Date: 2022-07-12
CHINA PETROLEUM & CHEM CORP +1
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[0018] Aiming at the problems existing in the existing PAO wastewater treatment, the present invention provides a treatment method and device for high-salt wastewater produced by PAO
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Embodiment 1
[0053] Using sodium fluoroborate, sodium fluoride, and sodium tetraborate as salts containing fluorine and boron, and using n-butanol as organic matter, PAO simulated wastewater was prepared. The water quality is shown in Table 1:
[0054] Table 1 Water quality index of PAO wastewater
[0055]
[0056] with attached figure 1 The device shown treats this PAO wastewater, the packing is metal wire mesh corrugated packing, the field effect is a magnetic field, and the treatment scale is 12,000 t / a. The main process parameters and material balance calculation results are shown in Tables 2-5.
[0057] Table 2 Main process parameters
[0058]
[0059] Table 3 Material balance of main reactor
[0060]
[0061] Table 4 Material balance of azeotropic distillation column
[0062]
[0063] Table 5 Material balance of layerer
[0064]
[0065] After the PAO simulated wastewater was treated, the TDS of the 1# effluent was 36 mg / L, and the desalination rate was 99.95%; th...
Embodiment 2～7
[0067] The composition of PAO wastewater is the same as that in Example 1. The difference lies in: different indicators of PAO wastewater and different main process parameters. The high-salt wastewater indicators, main process parameters and indicators of treated effluent are shown in Table 6.
[0068] Table 6 PAO wastewater treatment results
[0069]
Embodiment 8
[0071] The composition of wastewater quality is the same as that in Example 1. The difference: the field effect uses ultrasound. After the wastewater is treated, the TDS in the effluent is 10580mg / L, and the desalination rate is 85.39%; the COD is 685mg / L, and the organic matter removal rate is 96.94%. The reactor was operated for 6 months without obvious corrosion.
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Abstract
The invention relates to a treatment method and a device for producing high-salt wastewater from PAO. The device mainly includes five regions: a process intensification zone, a multi-stage vaporization zone, a crystallization separation zone, an azeotropic distillation zone and an anaerobic treatment zone. The strengthening zone mainly includes liquid distributor I, packing and field effect processor, etc. The wastewater is strengthened under the action of packing and field effect; the liquid distributor II is set up in the multi-stage vaporization zone, and the liquid distributor II is the boundary. It is divided into I-level vaporization zone and II-level vaporization zone; the vaporized concentrate enters the crystallization separation zone, and the miscellaneous salts in the vaporized concentrate are crystallized; the vaporized vapor enters the azeotropic distillation zone after condensation, and n-butanol is separated; recovery After n-butanol, the aqueous phase enters the anaerobic treatment zone for treatment. The invention can efficiently desalinate and reduce COD, and reduce crystallization energy consumption and equipment corrosion, and at the same time of high-efficiency desalination, the recovery and utilization of azeotrope can also be realized, and the economy of the process is improved.
Description
technical field [0001] The invention belongs to the technical field of wastewater treatment, in particular to a method for treating high-salt wastewater, in particular to a method and device for treating high-salt organic wastewater produced by PAO. Background technique [0002] Poly-olefin synthetic oil (PAO) is a high-quality low-viscosity PAO synthetic base oil produced from high carbon number linear-olefin as raw material. Among them, a fluorine-containing catalyst is used in the polymerization reaction process. Before the reaction product enters the separation unit and the hydrogenation unit for processing, it needs to pass through the alkali washing and water washing processes so as to completely neutralize and remove the fluorine-containing catalyst. Both the alkaline washing and water washing units generate a large amount of waste water, of which the water washing waste water can be directly recycled, while the alkaline washing waste water needs to be treated before ...
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