Showing papers on "Wet oxidation published in 1979"

Production and wet oxidation of heavy crude oil for generation of power

Abstract: Heavy oil from underground oil sands or tar sands is liquified with recirculation of superheated water and when brought to the ground surface is then wet oxidized for its heat value. The sulphur content of the products of wet oxidation is then wet reduced to elemental sulphur for by-product. The carbon dioxide gas generated as a product of wet oxidation is injected back to wells for its value as a diluter of the oil. Heat produced from wet oxidation is used for useful work at wells site.

Effects of Water Vapor and Oxygen Excitation on Oxidation of GaAs, GaP and InSb Surfaces Studied by X-Ray Photoemission Spectroscopy

Abstract: Addition of water vapor to oxygen enhances the room temperature oxidation of the (110) cleaved surfaces of compound semiconductors. The chemical shifts caused by wet oxidation are larger than those caused by dry oxidation for InSb, but are approximately equal for GaAs and GaP. The excitation of dry oxygen by a Tesla transformer enhances the oxidation much more and also causes higher oxidized states than those produced by dry oxidation at room temperature. The oxidation behaviors of the semiconductors under various oxidation conditions are discussed.

Energy recovery system

Abstract: The present invention is directed to an improved wet air oxidation system and method for reducing the chemical oxygen demand (COD) of waste water used from scrubbers of coal gasification plants, with this COD reduction being sufficient to effectively eliminate waste water as an environmental pollutant The improvement of the present invention is provided by heating the air used in the oxidation process to a temperature substantially equal to the temperature in the oxidation reactor before compressing or pressurizing the air The compression of the already hot air further heats the air which is then passed in heat exchange with gaseous products of the oxidation reaction for "superheating" the gaseous products prior to the use thereof in turbines as the driving fluid The superheating of the gaseous products significantly minimizes condensation of gaseous products in the turbine so as to provide a substantially greater recovery of mechanical energy from the process than heretofore achieved

The changes of adsorption properties of active carbon by wet oxidation

Abstract: The surface changes of active carbon by wet oxidation and the resulting changes in adsorptivity were studied. The oxidation of active carbon with hydrogen peroxide or nitric acid solutions caused the changes of the specific surface area from 1101 m2/g to 574 m2/g, immersional heat into water from 9.1 cal/g to 22.9 cal/g and immersional heat into ethanol from 28.4 cal/g to 18.8 cal/g. The average electrostatic field strength increased from 0 to 1.90 x 104 e. s. u./cm2 as well. Pore structure with the diameter around 14 A was partly damaged. The adsorption of water vapor and alizarin yellow and aniline dissolved in ethanol by the carbon was promoted by these oxidations whereas the adsorption of phenol, aniline and alizarin yellow from aqueous solutions were depressed.

Purification of gas and treatment of waste water

Abstract: PURPOSE: To remove NH 3 and COD components in waste water, by the wet oxidation of the waste water absorbing HCN, NH 3 , H 2 S, etc., at special conditions, in the presence of a specified catalyst. CONSTITUTION: By contacting a fuel gas, waste gas, etc. containing HCN, H 2 S and NH 3 , with water or an aqueous alkali solution supplied from tank 3, in absorber 2, harmful components are absorbed, and the solution is introduced into waste water tank 6, where its pH is adjusted to 8W11.5. After it is pressurized to a pressure for maintaining it in liquid phase, by pump 10, it is mixed, through heat exchanger 12, with a gas which is supplied from compresser 14 and humidifier 16, and contains oxygen in amounts 1W1.5 times the theretical amount required to decompose the organic and inorganic compounds in the waste water. Then it is heated to 100W 370°C and supplied into reactor 19, where it is subjected to wet oxidation in the presence of a supported catalyst containing a water-insoluble or slightly soluble compound such as Fe or Co. Thereafter its pH is adjusted to 5W8 with an alkaline material supplied from tank 28 and it is discharged through line 20 into gas-liquid separator 21, where a gas is separated from a liquid. COPYRIGHT: (C)1980,JPO&Japio

Treating method for waste liquid

Abstract: PURPOSE:To treat waste liq. economically despite of a severely corrosive environment without requiring pretreatment of the waste gas, by using specific austenic stainless steel as equipment material for wet oxidation at elevated temp. and press. of acidic ammonium-sulfate-contg. waste liq. which contains org. pollutant of high concn. CONSTITUTION:Acidic ammonium-sulfate-contg. waste liq. which contains high concn. of org. pollutant (e.g., a wate soln. 4-6.5 in pH, consisting usually of 5-20% ammonium sulfate, 2-10%org. pollutant, 500-5,000ppm cyanide, which is ischarged from AN manufacturing process) is wet-oxidized at elevated temp. and press. (e.g., 250-270 deg.C, 70kg/cm G) by the contact of it with O2-contg. gas. As the material of the apparatus for the wet oxidation at elevated temp. and press. is used an austenic low-carbon stainless steel contg. Ni not less than 12% (e. g., SUS 316 L) or an austenic stabilized stainless steel (e.g., sUS 321).

Process for the production of power from crude fuels containing high concentrations of sulfur

Abstract: A sulfur bearing fuel is wet oxidized in the presence of an alkaline earth metal carbonate, of which the corresponding sulfate is insoluble. Ash and sulfate salt blown down from the wet oxidation are reacted at high temperature with another portion of the same or a different fuel to reduce the sulfate to sulfide. Carbonation of an aqueous dispersion of the sulfide releases hydrogen sulfide which is converted to elemental sulfur. Carbonate precipitates and is recycled.

Method of decoloring wet oxidation treating liquor of sewage sludge* raw sewage* etc*

Abstract: PURPOSE:To efficiently decolor waste liquor, by wet oxidation treating raw waste liquor by mixing used activated carbon adopted for decoloring treatment, and treating the liquor by fresh activated carbon.