Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for treating catalyst production wastewater

A technology for producing wastewater and treatment methods, applied in water/sewage treatment, natural water treatment, chemical instruments and methods, etc., 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
View PDF7 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for treating catalyst production wastewater
  • Method for treating catalyst production wastewater
  • Method for treating catalyst production wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0115] Such as figure 1 As shown, the catalyst production wastewater (containing NaCl 78g / L, Na 2 SO 4 78g / L, NH 4 Cl44g / L, (NH 4 ) 2 SO 4 44.7g / L, pH is 6.9) through the first circulating pump 71 with the feed amount of 11.9m 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 (the measured value is 8.8); wherein, a part of the catalyst production wastewater (6.9m 3 / h) Send the first mother liquor into the first mother liquor tank 53 to mix, send a part of the remaining catalyst production waste water to the first heat exchange device 31 to exchange heat with the first ammonia-containing steam condensate, and the other part to exchange heat with the ninth circulation pump 79 After the returned secon...

Embodiment 2

[0124] Carry out the treatment of catalyst production waste water according to the method for embodiment 1, difference is: to containing NaCl45g / L, NaCl45g / L, Na 2 SO 4 90g / L, NH 4 Cl 31g / L, (NH 4 ) 2 SO 4 63g / L wastewater with a pH of 6.7 is treated with a feed volume of 16.3m 3 / h; set 5m 3 The catalyst production wastewater of / h is mixed with the second mother liquor returned by the ninth circulation pump 79 to obtain wastewater to be treated, its Cl - and SO 4 2- The molar ratio of is 21.91; The remainder waste water is mixed with the first mother liquor in the first mother liquor tank 53, wherein the concentration of NaCl is 245.1g / L, NaCl 2 SO 4 The concentration is 44.5g / L.

[0125] The evaporation conditions are shown in Table 2 below; the freezing and crystallization temperature is -4°C, and the time is 120 minutes.

[0126] Table 2

[0127]

[0128] The first solid-liquid separation device 91 obtains 1493.02 kg of sodium chloride crystallization fil...

Embodiment 3

[0132] Carry out the treatment of catalyst production waste water according to the method for embodiment 1, difference is: to containing NaCl120g / L, NaCl120g / L, NaCl 2 SO 4 61g / L, NH 4 Cl 40g / L, (NH 4 ) 2 SO 4 20.7g / L, pH 6.8 wastewater is treated, and the feed volume is 8.59m 3 / h; set 5m 3 The catalyst production wastewater of / h is mixed with the second mother liquor returned by the ninth circulation pump 79 to obtain wastewater to be treated, wherein Cl - and SO 4 2- The molar ratio of is 17.657; The remaining part waste water is mixed with the first mother liquor in the first mother liquor tank 53, wherein the concentration of NaCl is 251g / L, NaCl 2 SO 4 The concentration is 49.4g / L.

[0133] The evaporation conditions are shown in Table 3 below; the freezing and crystallization temperature is -2°C, and the time is 120 minutes.

[0134] table 3

[0135]

[0136] The first solid-liquid separation device 91 obtains 1637.02 kg of sodium chloride crystallizat...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to the field of sewage treatment, and discloses a method for treating catalyst production wastewater. The wastewater contains NH4<+>, SO4<2->, Cl<-> and Na<+>. The method comprises the following steps: 1) introducing the wastewater to be treated into a multi-effect evaporation device, and conducting evaporating to obtain a concentrated liquid containing ammonia vapor and sodium chloride crystals, wherein the wastewater to be treated contains the catalyst production wastewater; and 2) performing first solid-liquid separation on the concentrated liquid containing the sodiumchloride crystals, and subjecting a liquid phase obtained by the first solid-liquid separation to freeze-crystallization to obtain a crystallization liquid containing sodium sulfate crystals; and 4)subjecting the crystallization liquid containing the sodium sulfate crystals to second solid-liquid separation. The method can separately recover ammonium, sodium sulfate and sodium chloride in the wastewater, and reuse the resources in the wastewater 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C02F1/04C01C1/02C01D3/04C01D5/00C02F103/34
CPCC01C1/022C01D3/04C01D5/00C02F1/04C02F2103/34C02F2201/007
Inventor 殷喜平李叶苑志伟顾松园刘志坚王涛高晋爱安涛
Owner CHINA PETROLEUM & CHEM CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com