Treatment method of catalyst production wastewater

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

Active Publication Date: 2019-03-05
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 invention is to overcome the NH-containing 4 + , SO 4 2- , Cl - and Na + Due to the high cost of wastewater treatment and the problem that only mixed salt crystals can be obtained, a low-cost and environmentally friendly NH-containing 4 + , SO 4 2- , Cl - and Na + Catalyst production wastewater treatment method, 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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  • Treatment method of catalyst production wastewater

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Effect test

Embodiment 1

[0135] Such as figure 1 As shown, the catalyst production wastewater (containing NaCl 80g / L, Na 2 SO 4 30g / L, NH 4 Cl 40g / L, (NH 4 ) 2 SO 4 15.2g / L, pH 6.3) with a feed rate of 5m 3 The speed of / h is sent into the pipeline of the treatment system, and the sodium hydroxide aqueous solution of 45.16 mass % is introduced into the pipeline to adjust the pH value for the first time, and after the adjustment is monitored by the first pH value measuring device 61 (pH meter) The pH value (measured value is 7.9); through the first circulating pump 71, a part of the catalyst production wastewater is sent to the seventh heat exchange device 37 to exchange heat with the first ammonia-containing steam condensate, and another part of the catalyst production wastewater is passed through the ninth After the heat exchange device 39 exchanges heat with part of the first concentrated liquid, part of it is sent to the first heat exchange device 31 to exchange heat with the second ammonia...

Embodiment 2

[0144] Carry out the treatment of catalyst production waste water according to the method for embodiment 1, difference is: to containing NaCl 60g / L, NaCl 2 SO 4 61g / L, NH 4 Cl 25g / L, (NH 4 ) 2 SO 4 25.8g / L, pH 6.7 catalyst production wastewater for treatment, the feed amount is 5m 3 / h; Cl in the first concentrate - The concentration is 3.96mol / L, SO 4 2- The concentration is 0.364mol / L, Cl - / SO 4 2- Be 10.91 (mol / mol); Part of the first concentrate (4.58m 3 / h) After heat exchange by the ninth heat exchange device 39, it is mixed with the first mother liquor in the first mother liquor tank 53 to obtain a crystallization mixed liquor, wherein the concentration of NaCl is 252.9g / L, Na 2 SO 4 The concentration is 68g / L.

[0145] The temperature of the first evaporation is 100°C, the pressure is -22.80kPa, and the evaporation volume is 1.05m 3 / h; the temperature of the second evaporation is 100°C, the pressure is -22.83kPa, and the evaporation volume is 2.70m 3...

Embodiment 3

[0150] Carry out the treatment of catalyst production waste water according to the method for embodiment 1, difference is: to containing NaCl 45g / L, NaCl 2 SO 4 74g / L, NH 4 Cl 21g / L, (NH 4 ) 2 SO 4 35.1g / L, pH of 6.8 catalyst production wastewater for treatment, the feed rate is 5m 3 / h; Cl in the first concentrate - The concentration is 4.098mol / L, SO 4 2- The concentration is 0.365mol / L, Cl - / SO 4 2- Be 11.21 (mol / mol); Part of the first concentrate (8.04m 3 / h) The concentration of NaCl in the crystallization mixed solution obtained by mixing the first mother liquor in the first mother liquor tank 53 after heat exchange with the ninth heat exchange device 39 is 251.5g / L, NaCl 2 SO 4 The concentration is 60.9g / L.

[0151] The temperature of the first evaporation is 110°C, the pressure is 11.34kPa, and the evaporation volume is 1.31m 3 / h; the temperature of the second evaporation is 110°C, the pressure is 11.30kPa, and the evaporation volume is 2.03m 3 / h; ...

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Abstract

The invention relates to the field of sewage treatment, and discloses a treatment method of catalyst production wastewater. The catalyst production wastewater contains NH4<+>, SO4<2->, Cl<-> and Na<+>. The method comprises the following steps: 1) carrying out primary evaporation on to-be-treated wastewater to obtain first ammonia-containing steam and a first concentrated solution, wherein the to-be-treated wastewater contains the catalyst production wastewater; 2) carrying out secondary evaporation on the first concentrated solution to obtain second ammonia-containing steam and a second concentrated solution containing sodium chloride crystals; 3) carrying out cooling treatment on the second concentrated solution to obtain a treatment solution containing sodium chloride crystals; 4) carrying out primary solid-liquid separation on the treatment liquid, and carrying out cooling crystallization on the liquid phase obtained by the primary solid-liquid separation to obtain a crystallizationsolution containing sodium sulfate crystals; and 5) carrying out secondary solid-liquid separation on the crystallization solution containing sodium sulfate crystals. According to the method, high-purity sodium sulfate and sodium chloride can be obtained separately, and difficulties in processes of salt mixing treatment and reutilization are avoided.

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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IPC IPC(8): C02F9/10C01C1/02C01D3/04C01D5/00C02F101/10C02F101/12C02F101/16C02F103/34
CPCC01C1/022C01D3/04C01D5/00C02F9/00C02F1/048C02F2001/5218C02F2101/12C02F2101/101C02F2101/10C02F2101/16C02F1/66C02F2301/08C02F2103/34
Inventor殷喜平李叶周岩王涛顾松园刘志坚苑志伟
OwnerCHINA PETROLEUM & CHEM CORP