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A kind of treatment method of catalyst production wastewater

A technology for producing wastewater and treatment methods, applied in natural water body treatment, multi-stage water treatment, chemical instruments and methods, etc., can solve the problems of only obtaining mixed salt crystals, high cost and low cost of wastewater treatment, and reduce treatment costs. Cost, energy saving, effect of improving evaporation efficiency

Active Publication Date: 2021-09-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the existing technology containing NH4+, SO42-, Cl- and Na+ waste water treatment costs are high, and only mixed salt crystals can be obtained, provided A low-cost and environmentally friendly NH4+, SO42-, Cl- and Na+ wastewater treatment methods, which can recover ammonium, sodium sulfate, and sodium chloride in wastewater, and reuse resources in wastewater to the greatest extent

Method used

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  • A kind of treatment method of catalyst production wastewater
  • A kind of treatment method of catalyst production wastewater
  • A kind of treatment method of catalyst production wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0129] Such as figure 1 As shown, the waste water (containing NaCl 48g / L, Na 2 SO 4 90g / L, NH 4 Cl 47g / L, (NH 4 ) 2 SO 4 89.6g / L, pH 6.8) with a feed rate of 5m 3 The speed of / h is sent into the pipeline of the treatment system, mixed with the second mother liquor to obtain the waste water to be treated (the SO contained therein 4 2- and Cl - The molar ratio is 1:2.404), and the pH value after mixing is monitored by the first pH value measuring device 61 (pH meter) in the pipeline sent to the first heat exchange device 31 (titanium alloy plate heat exchanger) (measured value is 9.2), a part (3m 3 / h) into the first heat exchange device 31, and carry out the first heat exchange with the recovered first ammonia-containing steam condensate to raise the temperature of the waste water to be treated to 102 ° C, and the other part (1m 3 / h) into the fourth heat exchange device 34, and carry out the first heat exchange with the recovered second ammonia-containing steam co...

Embodiment 2

[0141] Carry out the treatment of waste water according to the method for embodiment 1, difference is: to containing NaCl 109g / L, NaCl 2 SO 4 105g / L, NH 4 Cl 23g / L, (NH 4 ) 2 SO 4 22.5g / L, pH 6.3 wastewater, the SO contained in the wastewater to be treated 4 2- and Cl - The molar ratio is 1:4.37. The temperature of the waste water to be treated after heat exchange through the first heat exchange device 31 , the fourth heat exchange device 34 and the fifth heat exchange device 35 is 108°C. The evaporation conditions of the first multiple-effect evaporator 2 and the second multiple-effect evaporator are shown in Table 3 below. The temperature of low temperature treatment is 25°C, and the residence time is 58min.

[0142] Table 2

[0143]

[0144] The first solid-liquid separation device 91 obtains 750.45 kg of sodium sulfate crystallization filter cake with water content of 14 mass % per hour, finally obtains sodium sulfate 645.39 kg (purity is 99.6% by weight) pe...

Embodiment 3

[0148] Carry out the treatment of waste water according to the method for embodiment 1, difference is: to containing NaCl 162g / L, NaCl 2 SO 4 69g / L, NH 4 Cl 30g / L, (NH 4 ) 2 SO 4 13g / L, pH 6.6 wastewater, the SO contained in the wastewater to be treated 4 2- and Cl - The molar ratio is 1:7.198. The temperature of the wastewater to be treated after heat exchange by the first heat exchange device 31 , the fourth heat exchange device 34 and the fifth heat exchange device 35 is 110°C. The evaporation conditions of the first multiple-effect evaporator 2 and the second multiple-effect evaporator are shown in Table 3 below. The temperature of low temperature treatment is 30°C, and the residence time is 55min.

[0149] table 3

[0150]

[0151] The first solid-liquid separation device 91 obtains 485.29 kg of sodium sulfate crystallization filter cake containing 15 mass % of water per hour, finally obtains 412.50 kg of sodium sulfate per hour (purity is 99.4% by weight);...

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Abstract

The invention relates to the field of sewage treatment, and discloses a method for treating wastewater produced by catalysts, the wastewater produced by catalysts contains NH 4 + , SO 4 2‑ , Cl ‑ and Na + , the method comprises, 1) passing the waste water to be treated into the first multi-effect evaporator for first evaporation to obtain the first concentrated liquid containing ammonia steam and sodium sulfate crystals, and the waste water to be treated contains the Catalyst production wastewater; 2) The first concentrated liquid is subjected to the first solid-liquid separation, and the liquid phase obtained by the first solid-liquid separation is passed into the second multi-effect evaporator for the second evaporation to obtain the second ammonia-containing steam and the The second concentrated solution of sodium sulfate crystals and sodium chloride crystals; 3) subjecting the second concentrated solution to low-temperature treatment to dissolve the sodium sulfate crystals to obtain a treatment solution containing sodium chloride crystals; 4) making the chlorine-containing The treatment solution of the sodium chloride crystal is subjected to the second solid-liquid separation. The method can recover the ammonium, sodium sulfate and sodium chloride in the waste water respectively, and reuse the resources in the waste water to the greatest extent.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a method for treating wastewater produced by catalysts, in particular to a method containing NH 4 + , SO 4 2- , Cl - and Na + Catalyst production wastewater treatment method. Background technique [0002] In the production process of oil refining catalyst, a large amount of inorganic acid-base salts such as sodium hydroxide, hydrochloric acid, sulfuric acid, ammonium salt, sulfate, hydrochloride, etc. are required, and a large amount of ammonium, sodium sulfate, sodium chloride and aluminosilicate are produced Salt mixed sewage. For such sewage, the usual practice in the prior art is to first adjust the pH value to the range of 6-9, remove most of the suspended solids, and then use biochemical methods, stripping methods or stripping methods to remove ammonium ions. In addition, after adjusting the pH value of the salty sewage, removing most of the suspended matter, removing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C01D3/04C01D5/00C02F9/00C02F1/04C02F1/66C02F101/10C02F101/12C02F101/16C02F103/34
CPCC01C1/022C01D3/04C01D5/00C01P2006/80C02F1/04C02F1/66C02F9/00C02F2101/101C02F2101/12C02F2101/16C02F2103/34C02F2301/08
Inventor 殷喜平李叶杨凌陈玉华周岩安涛刘夫足吕伟娇张志民
Owner CHINA PETROLEUM & CHEM CORP
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