Unlock instant, AI-driven research and patent intelligence for your innovation.

Supercritical oxidation process for the treatment of corrosive materials

A supercritical oxidation and supercritical technology, applied in sludge treatment, oxidation treatment of sludge, chemical instruments and methods, etc., can solve problems such as damage to the auxiliary piping system of the reactor, erosion, etc.

Inactive Publication Date: 2009-04-08
METAL TECH CO LTD
View PDF0 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the water to be treated initially contains precursors of potentially corrosive species such as sulfide compounds, the transition from the supercritical state to lower temperature and pressure ranges inevitably leads to the formation of highly corrosive chemicals such as sulfuric acid , this highly corrosive chemical will attack and damage the reactor or any further downstream ancillary piping systems

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
  • Supercritical oxidation process for the treatment of corrosive materials
  • Supercritical oxidation process for the treatment of corrosive materials
  • Supercritical oxidation process for the treatment of corrosive materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027]Referring to FIG. 3 , the molybdenum sulfide concentrate and water are mixed with a solid:liquid ratio of 1:4 and delivered to the feed tank 25 as a slurry. From the holding tank, the slurry was pumped with pumps 26 and 27 through heaters at T = 390°C to reactors 30 and 31 . The oxidant is supplied to the reactor at a pressure of 22-25 MPa.

[0028] Under these conditions, the oxidation reaction of molybdenum sulfide occurs:

[0029] MoS 2 +3H 2 O+4.5O 2 =H 2 MoO 4 +2H 2 SO 4

[0030] The resulting slurry was transferred to the cooling chamber 31 having the above-mentioned configuration, and a cooling solution (10°C-25°C) was injected into the cooling chamber 31 . Circulation of said solution in a 2:1 ratio to the stock solution caused a rapid drop in temperature of the slurry to about 200°C.

[0031] When the concentration of the circulating sulfuric acid solution exceeds a predetermined limit, it is removed from the process to further recover the molybdenum. ...

Embodiment 2

[0033] The same experiment was performed with mixed copper sulfide (chalcopyrite). The solid:liquid ratio is 1:5, T=400°C, P=20-25MPa. As in Example 1, the cooling of the reaction was accomplished by using the circulating solution (10° C.-25° C.) as a cooling agent in a ratio of 2:1 to the original solution. Thereby, the desired temperature of the slurry, ie T2 SO 4 ;5g / l Fe;

[0034] Experiments performed have shown that cooling with a cooled circulating solution (T=10°C-25°C) lowers the temperature below 200°C while preventing corrosion in the cooling chamber and connecting parts.

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

A supercritical oxidation process, which comprises pressurizing and heating an aqueous system to form a fluid phase under supercritical conditions, feeding an oxidizer into said fluid phase to cause an oxidation reaction therein, directing the resultant fluid reaction phase into a central region of a cooling chamber while providing a coolant in an internal peripheral region of said cooling chamber, said peripheral region being adjacent to the inner surface of the cooling chamber, mixing the fluid reaction phase with said coolant within the cooling chamber, removing the reaction mixture from said cooling chamber and subsequently further reducing the temperature and the pressure of said reaction mixture to obtain a product mixture.

Description

Background technique [0001] It has been proposed in the prior art to conduct oxidation reactions of corrosive materials such as sulfide-containing aqueous media under supercritical conditions (ie, temperatures above 374° C. and pressures above 22.1 MPa). Under such conditions, the reaction mixture is in the form of a single fluid phase. The prior art has also recognized the potential of the above techniques for treating sewage to destroy organic impurities therein. [0002] After completion of the oxidation reaction, it is of course necessary to cool and reduce the pressure of the fluid reaction phase. However, when the water to be treated initially contains precursors of potentially corrosive species such as sulfide compounds, the transition from the supercritical state to lower temperature and pressure ranges inevitably leads to the formation of highly corrosive chemicals such as sulfuric acid , this highly corrosive chemical will attack and damage the reactor or any furth...

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 Applications(China)
IPC IPC(8): C02F11/08
CPCC02F2101/101C02F11/086C02F2101/20C02F11/08
Inventor 阿里尔·罗森伯格
Owner METAL TECH CO LTD