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Method for treating catalyst production wastewater

A technology for producing wastewater and treatment methods, which is applied in water/sewage treatment, chemical instruments and methods, and neutralized water/sewage treatment, etc. It can solve the problems of low cost, only mixed salt crystals can be obtained, and high cost of wastewater treatment.

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 + The wastewater treatment method, which can recover ammonium, sodium sulfate, and sodium chloride in the wastewater, and reuse the resources in the wastewater to the greatest extent

Method used

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  • Method for treating catalyst production wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0112] Such as figure 1 As shown, the catalyst production wastewater (containing NaCl 120g / L, Na 2 SO 4 48g / L, NH 4 Cl23g / L, (NH 4 ) 2 SO 4 9.35g / L, pH 6.8) with a feed rate of 8.40m 3 The speed of / h is sent into the pipeline of the treatment system, and the sodium hydroxide aqueous solution that imports concentration is 45.16 mass % in the pipeline is carried out the pH value adjustment for the first time, by the first pH value measuring device 61 (pH meter) after adjusting The pH value is monitored (measured value is 9.1); Then by the first circulating pump 71 the 3.40m 3 / h Catalyst production wastewater is sent to the first mother liquor tank 53 to mix with the first mother liquor, another part of catalyst production wastewater is sent to the first heat exchange device 31 to exchange heat with the first ammonia-containing steam condensate, and the rest of the catalyst production wastewater After mixing with the second mother liquid returned by the ninth circulati...

Embodiment 2

[0119] Carry out the treatment of catalyst production waste water according to the method for embodiment 1, difference is: to containing NaCl68g / L, NaCl68g / L, NaCl 2 SO 4 100g / L, NH 4 Cl 24g / L, (NH 4 ) 2 SO 4 35.9g / L, pH 6.7 catalyst production wastewater for treatment, feed volume is 13.3m 3 / h; set 5.0m 3 Cl - and SO 4 2- The molar ratio is 18.948; The rest of the catalyst production waste water is mixed with the first mother liquor in the first mother liquor tank 53, and the concentration of NaCl in the gained mixed liquor is 247.0g / L, NaCl 2 SO 4 The concentration is 43.6g / L.

[0120] The evaporation temperature is 75°C, the pressure is -72.75kPa, and the evaporation volume is 8.90m 3 / h; the cooling crystallization temperature is -2°C, and the time is 120min.

[0121] The first solid-liquid separation device 91 obtains water content per hour and is 1462.30kg of sodium chloride crystallization filter cake of 15% by mass, and finally obtains 1242.96kg of sodium...

Embodiment 3

[0125] Carry out the treatment of catalyst production waste water according to the method for embodiment 1, difference is: to containing NaCl99g / L, NaCl99g / L, NaCl 2 SO 4 101g / L, NH 4 Cl 26g / L, (NH 4 ) 2 SO 4 27g / L, pH 6.9 catalyst production wastewater for treatment, feed volume is 12.15m 3 / h; set 5.0m 3 Cl - and SO 4 2- The molar ratio is 16.938; The rest of the catalyst production waste water is mixed with the first mother liquor in the first mother liquor tank 53, and the concentration of NaCl in the mixed liquor obtained is 238.5g / L, NaCl 2 SO 4 The concentration is 47.1g / L.

[0126] The evaporation temperature is 50°C, the pressure is -92.67kPa, and the evaporation volume is 8.76m 3 / h; the cooling crystallization temperature is -4°C, and the time is 120min.

[0127] The first solid-liquid separation device 91 obtains 1788.93 kg of sodium chloride crystallization filter cake with a water content of 14 mass % per hour, and finally obtains 1538.48 kg of sodi...

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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 NH4+, SO42-, Cl- and Na+. The method comprises the following steps: 1) introducing to-be-treated wastewater into a MVR evaporation device for evaporation so as to obtain ammonia-containing vapor and a concentrated liquid containing sodium chloride crystals, wherein the to-be-treated wastewater contains the catalyst production wastewater; 2) subjecting the concentrated liquid containing the sodium chloride crystals to first solid and liquid separation, and subjecting a liquid phase obtained by first solid and liquid separation to cooling and crystallization so as to obtain a crystallized liquid containing sodium sulfate crystals; and 3) subjecting the crystallized liquid containing the sodium sulfate crystals to secondary solid and liquid separation. The method provided by the invention can separately recover ammonium, sodium sulfate and sodium chloride in the wastewater, and reutilizes resources in the wastewater to a 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 Applications(China)
IPC IPC(8): C02F9/10C01C1/02C01D3/06C01D5/16
CPCC01C1/02C01D3/06C01D5/16C02F9/00C02F1/048C02F2001/5218C02F1/66
Inventor 殷喜平李叶刘志坚杨凌顾松园苑志伟张志民高晋爱安涛
Owner CHINA PETROLEUM & CHEM CORP
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