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A method for treating catalyst production wastewater

A technology for the production of wastewater and treatment methods, applied in multi-stage water treatment, chemical instruments and methods, multi-stage water/sewage treatment, etc., can solve the problems of only mixed salt crystals, low cost, and high cost of wastewater treatment

Active Publication Date: 2021-09-14
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

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  • A method for treating catalyst production wastewater
  • A method for treating catalyst production wastewater
  • A method for treating catalyst production wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0130] Such as figure 1 As shown, the catalyst production wastewater (containing NaCl 158g / L, Na 2 SO 4 46g / L, NH 4 Cl 57g / L, (NH 4 ) 2 SO 4 16.9g / L, pH 6.4) with a feed rate of 5m 3 The speed of / h is sent into the pipeline of treatment system, and in waste water conveying pipeline, import concentration is that the sodium hydroxide aqueous solution of 45.16 mass % carries out pH value adjustment, then mixes with the second mother liquor to obtain waste water to be treated (the SO2 contained therein 4 2- and Cl - The molar ratio is 1:7.9515), and before being sent to the first heat exchange device 31, the third heat exchange device 33 and the fifth heat exchange device 35 (both are titanium alloy plate heat exchangers) through the first pH value Measuring device 61 (pH meter) monitors the adjusted pH value (measured value is 9), and a part (2m 3 / h) into the first heat exchange device 31, and carry out the first heat exchange with the recovered first ammonia-contain...

Embodiment 2

[0140] Carry out the treatment of catalyst production waste water according to the method for embodiment 1, difference is: to containing NaCl 76g / L, NaCl 2 SO 4 128g / L, NH 4 Cl 16g / L, (NH 4 ) 2 SO 4 27.4g / L, pH is 6.7 catalyst production wastewater is processed, and the SO contained in the wastewater to be treated obtained 4 2- and Cl - The molar ratio is 1:2.9034. The temperature of the waste water after the heat exchange by the first heat exchange device 31 is 95°C, the temperature of the waste water to be treated after the heat exchange by the third heat exchange device 33 is 93°C, and the temperature of the waste water to be treated after the heat exchange by the fifth heat exchange device 35 is 95°C. The temperature of the treated wastewater is 93°C. The evaporation conditions of the multi-effect evaporator 2 and the MVR evaporator 1 are shown in Table 2 below. The temperature of low temperature treatment is 25°C, and the residence time is 60min.

[0141] Tabl...

Embodiment 3

[0147] Carry out the treatment of catalyst production waste water according to the method for embodiment 1, difference is: to containing NaCl 118g / L, NaCl 2 SO 4 116g / L, NH 4 Cl 19g / L, (NH 4 ) 2 SO 4 19g / L, pH is 6.8 catalyst production wastewater is processed, and the SO contained in the wastewater to be treated obtained 4 2- and Cl - The molar ratio is 1:4.4621. The temperature of the waste water after heat exchange through the first heat exchange device 31 is 98°C, the temperature of the waste water to be treated after heat exchange through the third heat exchange device 33 is 103°C, and the temperature of the waste water to be treated after heat exchange through the fifth heat exchange device 35 is 98°C. The temperature of the treated wastewater was 103°C. The evaporation conditions of the multi-effect evaporator 2 and the MVR evaporator 1 are shown in Table 3 below. The temperature of low temperature treatment is 30°C, and the residence time is 65min.

[0148]...

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Abstract

The invention relates to the field of sewage treatment and discloses a method for treating catalyst production wastewater. The wastewater contains NH 4 + ,SO 4 2‑ ,Cl ‑ and Na + , the method includes, 1) sequentially passing the wastewater to be treated into each effect evaporator of the multi-effect evaporation device to perform the first evaporation to obtain the first concentrated liquid containing ammonia vapor and sodium sulfate crystals, and the wastewater to be treated is The wastewater contains the catalyst production wastewater; 2) the first concentrated liquid containing sodium sulfate crystals is subjected to the first solid-liquid separation, and the liquid phase obtained by the first solid-liquid separation is passed into the MVR evaporation device for the second evaporation, Obtain the second ammonia-containing vapor and the second concentrated liquid; 3) perform low-temperature treatment on the second concentrated liquid to dissolve the sodium sulfate crystals to obtain a treatment liquid containing sodium chloride crystals; 4) treat the second concentrated liquid containing sodium chloride The crystal treatment liquid undergoes second solid-liquid separation. This method can separately recover ammonium, sodium sulfate, and sodium chloride in wastewater, maximizing the reuse of resources in wastewater.

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): C02F9/10C01D3/04C01D5/00C01C1/02
CPCC01C1/022C01D3/04C01D5/00C01P2006/80C02F1/04C02F1/38C02F2301/08
Inventor 殷喜平李叶顾松园刘志坚陈玉华吕伟娇徐淑朋张志民安涛杨凌
Owner CHINA PETROLEUM & CHEM CORP
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