Oxidative treatment method of high-salt wastewater containing calcium chloride

A high-salt wastewater, oxidation treatment technology, applied in the direction of oxidation water/sewage treatment, water/sewage treatment, chemical instruments and methods, etc., can solve the problem of reducing the efficiency of mass transfer and heat transfer, unfavorable use of calcium chloride, and generation of secondary Secondary wastewater and other problems, to achieve the effect of low treatment cost, low organic matter content, and reduced treatment cost

Active Publication Date: 2022-04-01
山东沾化金嘉利化工科技有限公司
View PDF11 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The above methods for treating calcium chloride-containing wastewater mainly focus on the concentration and recovery of calcium chloride, ignoring the treatment of organic matter in the wastewater. The presence of organic matter will be enriched as the concentration proceeds, reducing the efficiency of mass transfer and heat transfer , the separated calcium chloride will also contain a certain amount of organic matter, which is not conducive to the subsequent use of calcium chloride; and there are defects such as high cost, complicated process, high reaction temperature, high pressure, and secondary wastewater

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Add the wastewater from the production of epichlorohydrin to the oxidation reactor, add a homogeneous catalyst, raise the temperature and feed the oxidant, under the action of the homogeneous catalyst, the organic matter in the wastewater reacts with the oxidant and degrades into small molecular organic matter, small molecule The organic matter enters the fixed-bed reactor filled with solid catalyst along with the evaporated steam and oxidant, and the small molecular organic matter is completely oxidized into water and carbon dioxide in the fixed-bed reactor. The oxidized waste water is exchanged with the incoming water through the heat exchange device, heat recovery. The temperature, flow rate and residence time of the reaction are controlled, and the water is sampled for analysis after the reaction is completed. The wastewater in the oxidation reactor is continuous water inflow. As the reaction progresses, the CaCl in the reactor 2 After the concentration gradually r...

Embodiment 2

[0037] Wastewater treatment process is the same as embodiment 1.

[0038] The process parameters are:

[0039] CaCl in epichlorohydrin production wastewater 2 The content is 15.0wt.%, and the COD is 5000mg / L; after copper chloride is added to the wastewater produced by epichlorohydrin, Cu 2+The molar concentration in the epichlorohydrin production wastewater is 0.7mmol / L; the temperature in the oxidation reactor is 160°C, and the residence time is 5min; the secondary oxidation fixed-bed reactor is filled with porous solid catalyst Co / C, and the reaction temperature is 230°C, the residence time is 5min, the flow rate of wastewater is 150ml / min, and the oxidant is oxygen.

[0040] After testing, the removal rate of COD in the treated organic wastewater is 97.20%. CaCl 2 The recovery rate is 94.8%, and the solid salt is analyzed after drying, and its quality index is: CaCl 2 : 97.8wt.%; Cu 2+ : 2.0 μg / g; TOC: 5.1 μg / g.

Embodiment 3

[0042] Wastewater treatment process is the same as embodiment 1.

[0043] The process parameters are:

[0044] CaCl in epichlorohydrin production wastewater 2 The content is 15.0wt.%, and the COD is 5000mg / L; after adding ferric chloride to the wastewater produced by epichlorohydrin, Fe 3+ The molar concentration in the epichlorohydrin production wastewater is 0.8mmol / L; the temperature in the oxidation reactor is 170°C, and the residence time is 10min; the secondary oxidation fixed-bed reactor is filled with porous solid catalyst Co / C, and the reaction temperature is 240°C, the residence time is 3min, the flow rate of wastewater is 100ml / min, and the oxidant is oxygen.

[0045] After testing, the removal rate of COD in the treated organic wastewater is 98.2%, CaCl 2 The recovery rate is 95.1%, and the solid salt is analyzed after drying, and its quality index is: CaCl 2 : 94.8wt.%; Fe 3+ : 2.0 μg / g; TOC: 5.8 μg / g.

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 belongs to the technical field of organic wastewater treatment, and in particular relates to an oxidation treatment method for calcium chloride-containing high-salt wastewater. Add a homogeneous catalyst to the high-salt wastewater containing calcium chloride, heat up, add an oxidant to carry out the first oxidation reaction, and obtain small molecular organic matter, calcium chloride solid and calcium chloride mother liquor, the calcium chloride mother liquor is recycled, and small molecular organic matter , The oxidant and the solid catalyst perform a second oxidation reaction to obtain water and carbon dioxide; the solid catalyst is one of the porous solid catalysts supported by activated carbon on Cu / C, Co / C or Cu-Co / C. The invention fully couples the separation of calcium chloride and the oxidation treatment of organic matter, has a simple process flow, greatly reduces the content of COD in organic wastewater, and has low organic matter content in the separated water, which can be reused, and solid salt can also be used as a by-product.

Description

technical field [0001] The invention belongs to the technical field of organic wastewater treatment, and in particular relates to an oxidation treatment method for calcium chloride-containing high-salt wastewater. Background technique [0002] Epichlorohydrin is an important chemical raw material, which has been widely used in the production of epoxy resin, glass fiber reinforced plastics, electrical insulation materials, surfactants, medicines, pesticides, coatings, ion exchange resins, plasticizers, chlorohydrin rubber, etc. The method of producing epichlorohydrin from crude glycerol, which is a by-product of the material, has the advantages of less investment, low cost, and simple production process, and is more and more favored by people. However, this method will produce a large amount of high-salt organic wastewater containing glycerin in the production process of epichlorohydrin, the salt content is as high as 200g / L, and the COD content is as high as 3000mg / L or more...

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
Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/72C02F1/74
CPCC02F1/725C02F1/74C02F1/727
Inventor 王景华崔洪友张广俊刘振邦杨明刚刘勤学王新刚高伟
Owner 山东沾化金嘉利化工科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap