WO2014149908A1 - Contrôle du ph pour permettre l'oxydation à l'air humide catalytique homogène - Google Patents

Contrôle du ph pour permettre l'oxydation à l'air humide catalytique homogène Download PDF

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Publication number
WO2014149908A1
WO2014149908A1 PCT/US2014/021475 US2014021475W WO2014149908A1 WO 2014149908 A1 WO2014149908 A1 WO 2014149908A1 US 2014021475 W US2014021475 W US 2014021475W WO 2014149908 A1 WO2014149908 A1 WO 2014149908A1
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WO
WIPO (PCT)
Prior art keywords
catalyst
aqueous mixture
level
process according
wet oxidation
Prior art date
Application number
PCT/US2014/021475
Other languages
English (en)
Inventor
Chad L. Felch
Bryan J. Kumfer
Original Assignee
Siemens Energy, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US13/840,114 external-priority patent/US9193613B2/en
Application filed by Siemens Energy, Inc. filed Critical Siemens Energy, Inc.
Priority to CN201480016168.XA priority Critical patent/CN105050965A/zh
Priority to JP2016500770A priority patent/JP2016515927A/ja
Priority to RU2015143453A priority patent/RU2015143453A/ru
Priority to KR1020157028858A priority patent/KR20150127708A/ko
Priority to EP14714041.2A priority patent/EP2969975A1/fr
Publication of WO2014149908A1 publication Critical patent/WO2014149908A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/74—Treatment of water, waste water, or sewage by oxidation with air
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/06—Treatment of sludge; Devices therefor by oxidation
    • C02F11/08—Wet air oxidation
    • C02F11/086—Wet air oxidation in the supercritical state
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/02—Temperature
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/03—Pressure
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/06—Controlling or monitoring parameters in water treatment pH

Definitions

  • the present invention relates generally to the treatment of process streams and, more particularly, to catalytic wet oxidation systems and methods for treatment of undesirable constituents therein.
  • wet oxidation is a well-known technology for treating process streams, and is widely used, for example, to destroy pollutants in wastewater.
  • the method involves aqueous phase oxidation of undesirable constituents by an oxidizing agent, generally molecular oxygen from an oxygen-containing gas, at elevated temperatures and pressures.
  • the process can convert organic contaminants to carbon dioxide, water and biodegradable short chain organic acids, such as acetic acid.
  • Inorganic constituents including sulfides, mercaptides and cyanides can also be oxidized.
  • wet oxidation may be used in a wide variety of applications to treat process streams for subsequent discharge, in-process recycle, or as a pretreatment step to supply a conventional biological treatment plant for polishing.
  • Catalytic wet oxidation has emerged as an effective enhancement to traditional non-catalytic wet oxidation.
  • Catalytic wet oxidation processes generally allow for greater destruction to be achieved at a lower temperature and pressure, and therefore a lower capital cost.
  • An aqueous stream to be treated is mixed with an oxidizing agent and contacted with a catalyst at elevated temperatures and pressures.
  • Heterogeneous catalysts typically reside on a bed over which the aqueous mixture is passed, or in the form of solid particulate which is blended with the aqueous mixture prior to oxidation.
  • the catalyst may be filtered out of the oxidation effluent downstream of the wet oxidation unit for reuse.
  • a catalytic wet oxidation process may comprise providing an aqueous mixture containing at least one undesirable constituent to be treated, detecting a pH level of the aqueous mixture containing at least one undesirable constituent to be treated, selecting a catalyst soluble at the detected pH level of the aqueous mixture, wherein the catalyst and the detected pH level are selected from the group consisting of: copper at a pH level of about 4 or lower, copper at a pH level above about 13, vanadium at a pH level above about 4.5, and iron at a pH level below about 4, contacting the aqueous mixture containing at least one undesirable constituent to be treated with the selected catalyst soluble at the detected pH level and an oxidizing agent at an elevated temperature and a superatmospheric pressure to treat the at least one undesirable constituent, monitoring the pH level of the aqueous mixture, and maintaining the pH level of the aqueous mixture to maintain the catalyst in a soluble form during the catalytic wet oxidation process.
  • the catalytic wet oxidation process comprises providing an aqueous mixture containing at least one undesirable constituent to be treated, selecting a catalyst, detecting a pH level of the aqueous mixture containing at least one undesirable constituent to be treated, adjusting the pH level of the aqueous mixture containing at least one undesirable constituent to be treated to solubilize the selected catalyst, the pH level selected from the group consisting of: about 4 or lower when the catalyst comprises copper, above about 13 when the catalyst comprises copper, above about 4.5 when the catalyst comprises vanadium, and below about 4 when the catalyst comprises iron, contacting the aqueous mixture with the selected catalyst and an oxidizing agent at an elevated temperature and a
  • selecting the catalyst comprises selecting a catalyst present in the aqueous mixture.
  • adjusting the pH level comprises utilizing an alkali metal hydroxide.
  • contacting the aqueous mixture with the selected catalyst occurs prior to heating. In various embodiments, contacting the aqueous mixture with the selected catalyst occurs prior to pressurization. In some embodiments, the aqueous mixture is oxidized in a continuous process. In at least one aspect, the method further comprises replenishing the catalyst. In some aspects, contacting the aqueous mixture with an oxidizing agent comprises contacting the aqueous mixture with an oxygen-containing gas. In certain aspects, the method further comprises recovering the catalyst. According to some aspects, recovering the catalyst involves precipitating the catalyst. In various embodiments, the aqueous mixture is oxidized for a period of time sufficient to treat the at least one undesirable constituent.
  • the superatmospheric pressure is from about 30 atmospheres to about 275 atmospheres.
  • the elevated temperature is from about 240 °C to about the critical temperature of water. In other aspects, the elevated temperature is above the critical temperature of water.
  • FIG. 1 is a system diagram in accordance with one embodiment of the wet oxidation system of the present invention.
  • FIGS. 2-4 are Pourbaix diagrams referenced herein for copper, vanadium, and iron, respectively.
  • the invention relates to one or more systems and methods for treating process streams.
  • the disclosed systems may receive process streams from community, industrial or residential sources.
  • the process stream may be delivered from a municipal wastewater sludge or other large-scale sewage system.
  • Process streams may also originate, for example, from food processing plants, chemical processing facilities, gasification projects, or pulp and paper plants.
  • the process stream may be moved through the system by an operation upstream or downstream of the system.
  • the term "process stream" refers to an aqueous mixture deliverable to the system for treatment. After treatment, the process stream may be returned to an upstream process or may exit the system as waste.
  • the aqueous mixture typically includes at least one undesirable constituent capable of being oxidized.
  • the undesirable constituent may be any material or compound targeted to be removed from the aqueous mixture, such as for public health, process design and/or aesthetic considerations.
  • the undesirable constituents capable of being oxidized are organic compounds. Certain inorganic constituents, for example, sulfides, mercaptides and cyanides can also be oxidized.
  • a source of an aqueous mixture to be treated by the system such as a slurry, may take the form of direct piping from a plant or holding vessel.
  • An oxidation reaction is one destruction technique, capable of converting oxidizable organic contaminants to carbon dioxide, water and biodegradable short chain organic acids, such as acetic acid.
  • One aspect of the present invention involves systems and methods for oxidative treatment of aqueous mixtures containing one or more undesirable constituents.
  • an aqueous mixture including at least one undesirable constituent is wet oxidized.
  • the aqueous mixture is oxidized with an oxidizing agent at an elevated temperature and superatmospheric pressure for a duration sufficient to treat the at least one undesirable constituent.
  • the oxidation reaction may substantially destroy the integrity of one or more chemical bonds in the undesirable constituent.
  • the phrase "substantially destroy” is defined as at least about 95% destruction.
  • the process of the present invention is generally applicable to the treatment of any undesirable constituent capable of being oxidized.
  • the disclosed wet oxidation processes may be performed in any known batch or continuous wet oxidation unit suitable for the compounds to be oxidized.
  • aqueous phase oxidation is performed in a continuous flow wet oxidation system, as exemplarily shown in FIG. 1.
  • Any oxidizing agent may be used.
  • the oxidant is usually an oxygen-containing gas, such as air, oxygen-enriched air, or essentially pure oxygen.
  • oxygen- enriched air is defined as air having an oxygen content greater than about 21%.
  • an aqueous mixture from a source flows through a conduit 12 to a high pressure pump 14 which pressurizes the aqueous mixture.
  • the aqueous mixture is mixed with a pressurized oxygen- containing gas, supplied by a compressor 16, within a conduit 18.
  • the aqueous mixture flows through a heat exchanger 20 where it is heated to a temperature which initiates oxidation.
  • the heated feed mixture then enters a reactor vessel 24 at inlet 38.
  • the wet oxidation reactions are generally exothermic and the heat of reaction generated in the reactor may further raise the temperature of the mixture to a desired value.
  • the bulk of the oxidation reaction occurs within reactor vessel 24 which provides a residence time sufficient to achieve the desired degree of oxidation.
  • the oxidized aqueous mixture and oxygen depleted gas mixture then exit the reactor through a conduit 26 controlled by a pressure control valve 28.
  • the hot oxidized effluent traverses the heat exchanger 20 where it is cooled against incoming raw aqueous mixture and gas mixture.
  • the cooled effluent mixture flows through a conduit 30 to a separator vessel 32 where liquid and gases are separated.
  • the liquid effluent exits the separator vessel 32 through a lower conduit 34 while off gases are vented through an upper conduit 36.
  • Treatment of the off gas may be required in a downstream off gas treatment unit depending on its composition and the requirements for discharge to the atmosphere.
  • the wet oxidized effluent may typically be discharged into a biological treatment plant for polishing.
  • the effluent may also be recycled for further processing by the wet oxidation system.
  • Sufficient oxygen-containing gas is typically supplied to the system to maintain residual oxygen in the wet oxidation system off gas, and the superatmospheric gas pressure is typically sufficient to maintain water in the liquid phase at the selected oxidation temperature.
  • the minimum system pressure at 240°C is 33 atmospheres
  • the minimum pressure at 280°C is 64 atmospheres
  • the minimum pressure at 373°C is 215 atmospheres.
  • the aqueous mixture is oxidized at a pressure of about 30 atmospheres to about 275 atmospheres.
  • the wet oxidation process may be operated at an elevated temperature below 374°C, the critical temperature of water. In some embodiments, the wet oxidation process may be operated at a supercritical elevated temperature.
  • the retention time for the aqueous mixture within the reaction chamber should be generally sufficient to achieve the desired degree of oxidation. In some embodiments, the retention time is above about one hour and up to about eight hours. In at least one embodiment, the retention time is at least about 15 minutes and up to about 6 hours. In one embodiment, the aqueous mixture is oxidized for about 15 minutes to about 4 hours. In another embodiment, the aqueous mixture is oxidized for about 30 minutes to about 3 hours.
  • the wet oxidation process is a catalytic wet oxidation process.
  • the oxidation reaction may be mediated by a catalyst.
  • the aqueous mixture containing at least one undesirable constituent to be treated is generally contacted with a catalyst and an oxidizing agent at an elevated temperature and superatmospheric pressure.
  • An effective amount of catalyst may be generally sufficient to increase reaction rates and/or improve the overall destruction removal efficiency of the system, including enhanced reduction of chemical oxygen demand (COD) and/or total organic carbon (TOC).
  • COD chemical oxygen demand
  • TOC total organic carbon
  • the catalyst may also serve to lower the overall energy requirements of the wet oxidation system.
  • the catalyst may be any transition metal of groups V, VI, VII and VIII of the Periodic Table.
  • the catalyst may be V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Mo, Ag, or alloys or mixtures thereof.
  • the transition metal may be elemental or present in a compound, such as a metal salt.
  • the transition metal catalyst is vanadium.
  • the transition metal catalyst is iron.
  • the transition metal catalyst is copper.
  • a catalyst may be added to the aqueous mixture at any point in the wet oxidation system.
  • the catalyst may be mixed with the aqueous mixture.
  • the catalyst may be added to the source of the aqueous mixture feeding the wet oxidation unit as illustrated in FIG. 1 in which catalyst source 40 is fluidly connected to storage tank 10.
  • the catalyst may be directly added to the wet oxidation unit.
  • the catalyst may also be supplied to the aqueous mixture prior to heating and/or pressurization.
  • the catalyst may already be present in the process stream to be treated.
  • the aqueous mixture supplied to the oxidation unit may contain a catalytic material.
  • transition metals may be present in a waste stream to be treated by the catalytic wet oxidation system.
  • Aqueous slurries such as those containing volatile organic carbons, may contain metals capable of acting as a catalyst.
  • the aqueous mixture may be a slurry of gasification byproducts.
  • the catalyst may be soluble in the aqueous mixture to enhance the wet oxidation process.
  • soluble when used in reference to a catalyst, means that the catalyst is completely dissolved or the amount of dissolved catalyst is catalytically sufficient to cause or accelerate a reaction for performing a desired process as described in the methods and systems disclosed herein.
  • characteristics of the aqueous mixture may impact the solubility of a catalyst in the aqueous mixture. For example, a pH level of the aqueous mixture to be treated may affect the solubility of a particular catalyst in the aqueous mixture.
  • a catalyst may be selected based on a characteristic of the aqueous mixture.
  • the wet oxidation system may include a sensor 50, configured to detect a characteristic of the aqueous mixture to be treated.
  • sensor 50 may be a pH sensor configured to detect a pH level of the aqueous mixture, and a catalyst for the wet oxidation process may be selected based on a detected pH level of the aqueous mixture.
  • a catalyst soluble at the detected pH level may be selected to enhance the wet oxidation process.
  • a catalyst comprising copper may be selected for catalyst source 40 in accordance with one or more embodiments.
  • a catalyst comprising vanadium may be selected when the detected pH level is above about 4.5.
  • a catalyst comprising iron may be selected when the detected pH level is below about 4.
  • Other catalysts beyond those exemplarily presented herein may be utilized.
  • a catalyst may be selected and one or more characteristics of the aqueous mixture may be manipulated to promote the presence of the selected catalyst in a soluble form to enhance the wet oxidation process.
  • a pH level of the aqueous mixture may be detected by sensor 50 and adjusted to solubilize the selected catalyst in the aqueous mixture.
  • a pH adjuster may be added to the aqueous mixture at any point within the wet oxidation system but is preferably added such that the catalyst is soluble within the aqueous mixture during the oxidation reaction.
  • a source of pH adjuster 60 may be fluidly connected to the source of the aqueous mixture 10 as illustrated in FIG. 1.
  • the source of pH adjuster 60 may generally include any material or compound capable of adjusting the pH level of the aqueous mixture to a desired value or range, such as an acid or base.
  • a desired value or range such as an acid or base.
  • an alkali metal hydroxide may be utilized to adjust the pH level of the aqueous mixture.
  • ammonia may be used to solubilize the catalyst.
  • pourbaix diagrams may provide information for determining a desired pH range in which a selected catalyst would be soluble.
  • the pH level of the aqueous mixture may be adjusted to about 4 or lower or above about 13 when the selected catalyst comprises copper.
  • the pH level of the aqueous mixture may be adjusted to above about 4.5 when the selected catalyst comprises vanadium.
  • the pH level of the aqueous mixture may be adjusted to a level below about 4 with reference to FIG. 4.
  • the wet oxidation system may include a controller 70 for adjusting or regulating at least one operating parameter of the system or a component of the system, such as, but not limited to, actuating valves and pumps.
  • Controller 70 may be in electronic communication with sensor 50 as illustrated in FIG. 1.
  • Controller 70 may be generally configured to generate a control signal to adjust the pH level of the aqueous mixture in response to the pH sensor 50 registering a pH level outside a predetermined pH solubility range for the selected catalyst.
  • controller 70 may provide a control signal to one or more valves associated with pH adjuster source 60 to add pH adjuster to aqueous mixture source 10.
  • the controller 70 is typically a microprocessor-based device, such as a programmable logic controller (PLC) or a distributed control system, that receives or sends input and output signals to and from components of the wet oxidation system.
  • Communication networks may permit any sensor or signal-generating device to be located at a significant distance from the controller 70 or an associated computer system, while still providing data therebetween.
  • Such communication mechanisms may be effected by utilizing any suitable technique including but not limited to those utilizing wireless protocols.
  • a liquid effluent is separated from the oxidized aqueous mixture downstream of the oxidation reactor.
  • the catalyst may be recovered from the liquid effluent by a separation process.
  • the catalyst may be precipitated out of the effluent stream.
  • a crystallizer may be used to recover the catalyst. The catalyst may then be recycled back to the wet oxidation system.
  • the wet oxidized liquid effluent stream may be processed by a secondary treatment unit 80 connected downstream of the oxidation reactor vessel 24 to remove remaining undesirable constituents present and/or polish when necessitated or desired.
  • the secondary treatment unit 80 may be a chemical scrubber, a biological scrubber, an adsorption media bed, or other unit operation.
  • an advanced oxidation step including oxidation treatment of the wet oxidation effluent with ozone and ultraviolet light may be performed. Such advanced oxidation treatment is typically carried out in a vessel or tank at or near ambient temperature and pressure.
  • the secondary treatment unit 80 may be sized to provide a surface area consistent with the desired degree of polishing.
  • the liquid effluent may also be recycled back to reactor vessel 24 for further processing. Treatment of the off gas may also be required in a downstream off gas treatment unit depending on its
  • Sensors to detect a concentration of a targeted odorous constituent may be provided upstream and/or downstream of the wet oxidation unit 24 to facilitate system control.
  • a sensor may be positioned at conduit 26 and be in communication with controller 70 to determine and/or control whether the liquid effluent stream should be diverted to the secondary treatment unit 80 to meet established environmental regulations.
  • controller 70 determines and/or control whether the liquid effluent stream should be diverted to the secondary treatment unit 80 to meet established environmental regulations.
  • the wet oxidation system may include additional sensors for measuring other properties or operating conditions of the system.
  • the system may include sensors for temperature, pressure drop, and flow rate at different points to facilitate system monitoring.
  • the catalyst may be replenished during the wet oxidation process.
  • the invention contemplates the modification of existing facilities to retrofit one or more systems or components in order to implement the techniques of the invention.
  • An existing wet oxidation system can be modified in accordance with one or more embodiments exemplarily discussed herein utilizing at least some of the preexisting equipment.
  • one or more pH sensors may be provided and a controller in accordance with one or more embodiments presented herein may be implemented in a preexisting wet oxidation system to promote catalyst solubility.
  • bench scale wet oxidation tests were performed in laboratory autoclaves.
  • the autoclaves differ from the full scale system in that they are batch reactors, where the full scale unit may be a continuous flow reactor.
  • the autoclaves typically operate at a higher pressure than the full scale unit, as a high charge of air must be added to the autoclave in order to provide sufficient oxygen for the duration of the reaction.
  • the results of the autoclave tests provide an indication of the performance of the wet oxidation technology and are useful for screening operating conditions for the wet oxidation process.
  • the autoclaves used were fabricated from titanium, alloy 600 and Nickel 200. The selection of the autoclave material of construction was based on the composition of the wastewater feed material. The autoclaves selected for use, each have total capacities of 500 or 750 ml.
  • the autoclaves were charged with wastewater and sufficient compressed air to provide excess residual oxygen following the oxidation (ca. 5%).
  • the charged autoclaves were placed in a heater/shaker mechanism, heated to the desired temperature (280°C to 350°C) and held at temperature for the desired time, ranging from about 60 minutes to about 360 minutes.
  • the autoclave temperature and pressure were monitored by a computer controlled data acquisition system. Immediately following oxidation, the autoclaves were removed from the heater/shaker mechanism and cooled to room temperature using tap water. After cooling, the pressure and volume of the off gas in the autoclave head- space were measured. A sample of the off-gas was analyzed for permanent gases. Subsequent to the analysis of the off gas, the autoclave was depressurized and opened. The oxidized effluent was removed from the autoclave and placed into a storage container. A portion of the effluent was submitted for analysis and the remaining sample was used for post-oxidative treatment. In order to generate sufficient volume for analytical work and post-oxidation test work, multiple autoclave tests for each condition were run.
  • Table 1 Results from wet oxidation (WO) of an acetic acid solution using copper catalyst.
  • the copper catalyst exhibited the highest solubility at pH levels of 2.2 and 13.5.
  • pH of the oxidized effluent was 2.2 and 13.5, about 98% and 88%> acetic acid destruction was achieved, respectively.
  • This also corresponded to the highest percentages of COD destruction (96.5%, 90%) and TOC destruction (96.4%, 88.1%).
  • lower percentages of COD destruction and TOC destruction were observed as well.
  • Table 2 Results from wet oxidation of an acetic acid solution using a vanadium catalyst.
  • Table 3 Results from wet oxidation of an oxalic acid solution using an iron catalyst.
  • Table 4 Results from wet oxidation of chlorophenol using an iron catalyst.
  • Table 5 Results from wet oxidation (WO) of an acetic acid solution using copper catalyst.
  • the term “plurality” refers to two or more items or components.
  • the terms “comprising,” “including,” “carrying,” “having,” “containing,” and “involving,” whether in the written description or the claims and the like, are open-ended terms, i.e., to mean “including but not limited to.” Thus, the use of such terms is meant to encompass the items listed thereafter, and equivalents thereof, as well as additional items. Only the transitional phrases “consisting of and “consisting essentially of,” are closed or semi-closed transitional phrases, respectively, with respect to the claims.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)
  • Catalysts (AREA)

Abstract

L'invention concerne un système et un procédé pour le traitement de courants de traitement. Un catalyseur médie un procédé d'oxydation humide à températures élevées et pressions élevées pour le traitement d'au moins un constituant indésirable dans un mélange aqueux. Un catalyseur peut être choisi pour sa solubilité à un niveau de pH détecté du mélange aqueux. En variante, un niveau de pH du mélange aqueux peut être réglé pour solubiliser un catalyseur choisi et/ou maintenir le catalyseur choisi sous une forme soluble. Un dispositif de commande en communication avec un capteur de pH peut être configuré pour générer un signal de commande pour régler le niveau de pH du mélange aqueux en réponse au capteur de pH enregistrant un niveau de pH hors d'une plage de solubilité de pH prédéterminée pour un catalyseur choisi.
PCT/US2014/021475 2013-03-15 2014-03-07 Contrôle du ph pour permettre l'oxydation à l'air humide catalytique homogène WO2014149908A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CN201480016168.XA CN105050965A (zh) 2013-03-15 2014-03-07 实现均相催化湿式空气氧化的pH控制
JP2016500770A JP2016515927A (ja) 2013-03-15 2014-03-07 均一触媒湿式酸化を可能にするためのｐＨ制御
RU2015143453A RU2015143453A (ru) 2013-03-15 2014-03-07 РЕГУЛИРОВАНИЕ pH С ЦЕЛЬЮ ГОМОГЕННОГО КАТАЛИТИЧЕСКОГО ОКИСЛЕНИЯ ВОЗДУХОМ
KR1020157028858A KR20150127708A (ko) 2013-03-15 2014-03-07 균일한 촉매 습식 공기 산화를 가능하게 하는 pH 조절
EP14714041.2A EP2969975A1 (fr) 2013-03-15 2014-03-07 Contrôle du ph pour permettre l'oxydation à l'air humide catalytique homogène

Applications Claiming Priority (2)

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US13/840,114 2013-03-15
US13/840,114 US9193613B2 (en) 2006-10-03 2013-03-15 pH control to enable homogeneous catalytic wet air oxidation

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Cited By (1)

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CN108927162A (zh) * 2017-05-22 2018-12-04 中国石油天然气股份有限公司 铜基湿式氧化催化剂的制备方法

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CN109502835B (zh) * 2019-01-14 2021-09-07 重庆工商大学 一种喷漆房废水处理工艺

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US20080078725A1 (en) * 2006-10-03 2008-04-03 Felch Chad L Catalytic wet oxidation systems and methods
WO2008042089A2 (fr) * 2006-10-03 2008-04-10 Siemens Water Technologies Corp. Oxydation en milieu humide de la suie
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