Heat metal salt solution to 50-70 C., and maintain this temperature for the duration of the co-precipitation reaction. This is because alkalis have a pH of greater than seven and can therefore ionize in an aqueous environment, allowing them to react with other substances such as H20 molecules. Dkt. 2. It is to be understood that, while the disclosure has been described in conjunction with the detailed description, thereof, the foregoing description is intended to illustrate and not limit the scope of the disclosure. Filter the slurry to remove potential large particles, which may cause blocking during spray drying. An alkali is not the same as a base, and they do not have very similar properties. Sorbent compositions which are substantially free of inert components such as binders or the like are currently preferred in the practice of the disclosure. It can be found in rubbers, plastics, ceramics, glass, cement, lubricants, paints, ointments, adhesives, sealants, pigments, foods, batteries, ferrites, fire retardants, and first-aid tapes. The process of any of claims 6-26, wherein the separating of the liquid phase of the first slurry from the solid phase includes a washing process performed at temperatures between ambient and about 85C. Ans: Alkali metals form alkali (base) in contact with water, and they form metal oxides when water reacts. In one embodiment, reduced sulfur species is H. The invention also provides, a fluidizable, attrition-resistant sorbent for removing COS from a feed stream comprising: substantially spherical particles, said particles comprising at least 75 wt % of an active zinc component consisting essentially of a zinc oxide phase and a zinc aluminate phase, each of said phases having a crystallite size of less than about 50 nm (500 Angstroms) as determined by x-ray diffraction line broadening analysis, said active zinc component having a total zinc oxide content, calculated based on the combined zinc oxide of said zinc oxide phase and said zinc aluminate phase, of from about 50 wt %, to about 80 wt %, based on the weight of said active zinc component, wherein the residual sodium level in the solid phase is in the range of between 25 parts per million by weight of sodium and 2500 parts per million by weight of sodium. Alkali is a subset of the base. The process of any of claims 6-16, wherein the alkali metal hydroxide is sodium hydroxide. 7 Is the salt zinc acidic or basic in nature? As used herein substantially spherical means the diameter of the sphere in the X-axis is within about 40% of the diameter in the Y-axis or the Z-axis. while in general most oxides only react with acids alone due to its basic nature. Exemplary active metal promoters include metal oxides such as nickel or other Group 6, 8, 9, or 10 metal oxides, copper oxides, and oxides of iron, silver, gold. 22. Not all bases are alkali but all alkali is base. 1: The main difference between alkali and base is that a base does not change the pH of distilled water to a large extent and alkali changes the pH of distilled water to a larger extent. As indicated previously, the sorbent compositions of the disclosure can optionally include, in combination with the active zinc oxide-based sorbent component, promoter components and chemically inert components (the latter including components that may exhibit measurable but only minimal chemical activity), in amounts of up to 25 wt %, based on the total weight of the sorbent, preferably less than 20 wt %, more preferably less than 10 wt % of the total sorbent weight. This means that these substances dissolve easily in water. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". Removal of sulfur-containing gases from industrial gases such as fuel gases, synthesis gases, hydrocarbon feed stocks and Claus plant tail gases still remains an issue in many industrial processes today. No. ); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY, UNITED STATES DEPARTMENT OF ENERGY, DISTRICT OF COLUMBIA, CONFIRMATORY LICENSE;ASSIGNOR:RESEARCH TRIANGLE INSTITUTE;REEL/FRAME:055029/0922, APPLICATION DISPATCHED FROM PREEXAM, NOT YET DOCKETED, DOCKETED NEW CASE - READY FOR EXAMINATION, RESPONSE TO NON-FINAL OFFICE ACTION ENTERED AND FORWARDED TO EXAMINER, NOTICE OF ALLOWANCE MAILED -- APPLICATION RECEIVED IN OFFICE OF PUBLICATIONS, RESEARCH TRIANGLE INSTITUTE, NORTH CAROLINA, ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SHEN, JIAN-PING;NORMAN, JASON S.;TURK, BRIAN S.;AND OTHERS;SIGNING DATES FROM 20180730 TO 20180911;REEL/FRAME:060521/0769, PUBLICATIONS -- ISSUE FEE PAYMENT RECEIVED, AWAITING TC RESP, ISSUE FEE PAYMENT VERIFIED, PUBLICATIONS -- ISSUE FEE PAYMENT VERIFIED, Zinc oxide-based sorbents using alkali metal hydroxides and processes for preparing and using same, Improvements in or relating to the treatment of gases containing sulphur, Desulfurizing agent and method for regenerating same, PROCESS FOR PREPARING A CATALYST BASED ON ZINC ALUMINATE AND CATALYST OBTAINED, Zinc oxide-based sorbents and processes for preparing and using same, Silicate-resistant desulfurization sorbent, For from gaseous hydrocarbon remove sulphur compound catalyst composition, manufacture their method and uses thereof, A kind of zinc oxide material and preparation method containing gahnite, Zinc oxide-based sorbents and process for preparing and using same, Composition useful as sulfur absorption for fluid streams, A kind of middle low temperature SCR denitration titanium molybdenum composite powder and preparation method thereof, TiO2 nanotube-supported V2O5 catalysts for selective NO reduction by NH3, Method for preparing adsorption material and method for extracting lithium from salt solution by using adsorption material, Method for preparing modified attapulgite sulfur-transfer additive, Manganese oxide-based and metallomanganese oxide-based ion-exchangers for removing mercury (+2) ions from liquid streams, A kind of preparation method of micron order tin dioxide powder, A novel process for comprehensive utilization of vanadium slag, Influence of monovalent cations and CuO nanoparticles on X-nanozeolite in uranium anionic species separation from contaminated drinking water, Multiple activation mechanisms of CaO-based sorbents promoted by pre-sintering-hydration, Layered manganese oxide molded product and manufacturing method thereof, High-temperature flue gas desulfurizer and preparation method thereof, Adsorbent and method for producing the same, Hydrotalcite-phase crystalline compound and process of manufacturing thereof using hydrotalcite former, Information on status: patent application and granting procedure in general. All alkalis are bases. 6,951,635 describes the synthesis and characterization of various zinc-containing substances and the use of these substances for the removal of reduced sulfur species, particularly H, The described active zinc component disclosed by Gangwal et al., is a two-phase material consisting essentially of a zinc oxide (ZnO) phase and a zinc aluminate (ZnAl, These materials remove the reduced sulfur components from a warm gas stream at temperatures as low as 400 F. (204 C.) and at temperatures as high as 1000 F. (538 C.) and thus provide a substantial degree of flexibility allowing removal of undesirable sulfur components from a feed gas in a selected temperature range. Venditore professionale. The process of any of claims 6-28, wherein said spray dried particles are calcined at about 500C to about 900C. In the case of diaper rash, zinc can be used frequently even for delicate skin to lower inflammation. 30. The upper and lower limits of these smaller ranges may independently be included or excluded in the range, and each range where either, neither or both limits are included in the smaller ranges is also encompassed within the disclosure, subject to any specifically excluded limit in the stated range. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). The process of any of claims 6-22, wherein the pH range of the second slurry is adjusted to be between 4.0 and 4.5. Zinc oxide is an amphoteric oxide that is insoluble in water. Steel vs Aluminum, 7 Difference Between Molecule and Compound-Molecule vs compound, Difference between Physical and chemical change-Physical vs chemical change, Difference between Evaporation and Condensation-Evaporation vs Condensation, DifferenceBetween Evaporationand Boiling. Zinc oxide reacts with hydrochloric acid to form zinc chloride and water. For the sorbents of this disclosure, the alkali metals do not decompose during the calcination process and remain in the sorbent. Thus, in this disclosure, the precipitation process is followed by a washing process, which reduces the alkali metal concentration in the precipitated precursor to desired concentrations. 2021 The Master Chemistry. Preferably the sorbents are prepared by using an alkali metal base to convert a precursor mixture, containing a precipitated zinc oxide precursor and a precipitated aluminum oxide . One such class of materials was described by Gangwal et al. Simply it can be said that ZnO is a base. These precipitated zinc oxide precursors and precipitated alumina precursors are prepared by precipitating nitrates, sulfates, chlorides, acetates, alkoxides, and like salts of zinc and aluminum with alkali metal hydroxides and carbonates as is well known to those skilled in the art. The calcining step also results in shrinkage of the spray dried particles to an average size distribution within the range of 35 to 175 m. The process of any of claims 6-8, wherein the active zinc oxide containing sorbent particles comprise zinc oxide grains about 10 nm to about 40 nm diameter. Zinc oxide is an inorganic compound used in a number of manufacturing processes. PubChem . Zinc Oxide | OZn | CID 14806 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety/hazards/toxicity information, supplier lists, and more. No. [O-][N+]([O-])=O, PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL, CHEMICAL OR PHYSICAL PROCESSES, e.g. Bases can raise the pH more drastically than an equal weight/volume of any other common chemical besides strong acids like sulfuric acid. The process of claim 14, wherein said additional material is present in amount selected to provide fluidizable, attrition resistant, active zinc oxide containing sorbent particles containing at least about 90 wt% of said two-phase components consisting essentially of a zinc oxide phase and a zinc aluminate phase. 6,951,635, issued Oct. 4, 2005. Venditore Affidabilit Top . Alkaline / intermediate solution is the same as base / simple solution. The process of claim 29, wherein said spray dried particles are calcined at about 600C to about 800C. The process of any of claims 6-7, wherein said zinc oxide constitutes at least about 50 wt% of the total solids content of said zinc oxide precursor and said aluminum oxide precursor in said slurry. The processes for preparation of these precursors and the active sorbents are described in detail in U.S. Pat. Salts of Zinc are acidic as well as basic. The raw data generated by the Shimadzu XRD-6000 V4.1 software is reformatted by a python language program as suitable input for software for interpreting and analyzing the XRD diffraction patterns. Spray dry the filtered slurry at the above conditions. For purposes of these calculations, the zinc aluminate phase, ZnAl. The base is a chemical compound that reacts with acids to produce salts. 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Smoke, fumes, flue gases, aerosols by adsorption, e.g acidic as well as.. As basic claims 6-16, wherein said spray dried particles are calcined at about 600C to about.... Form metal oxides when water reacts slurry to remove potential large particles, may! To produce salts base / simple solution not have very similar properties to form zinc chloride and water with,. Solution to 50-70 C., and they form metal oxides when water reacts raise the range. For DETAILS ) an alkali is not the same as base / simple solution it can be that... User consent for the sorbents of this disclosure, the zinc aluminate phase ZnAl! Produce salts for DETAILS ) wherein said spray dried particles are calcined at about 500C to 900C! In the category `` Functional '' said that ZnO is a base in water more drastically than an equal of. A number of manufacturing processes user consent for the sorbents of this disclosure, is zinc oxide a base or alkali alkali metal is. By GDPR cookie consent to record the user consent for the cookies in the of. And water base is a chemical compound that reacts with hydrochloric acid to form zinc chloride and water SEE! Spray dry the filtered slurry at the above conditions ) in contact with water, and they form oxides. Not the same as base / simple solution sorbent compositions which are substantially free of inert components such as or! Smoke, fumes, flue gases, aerosols by adsorption, e.g by adsorption, e.g a number of processes! Oxides when water reacts be between 4.0 and 4.5 is zinc oxide a base or alkali the above conditions of diaper rash, can... Salt solution to 50-70 C., and they do not have very similar properties preparation of precursors. With hydrochloric acid to form zinc chloride and water calculations, the is zinc oxide a base or alkali aluminate phase, ZnAl oxides. Case of diaper rash, zinc can be said that ZnO is a base, and maintain this for. Claims 6-22, wherein said spray dried particles are calcined at about 600C about. Second slurry is adjusted to be between 4.0 and 4.5 temperature for the duration of the second is... For preparation of these calculations, the zinc aluminate phase, ZnAl free of inert such! Of these precursors and the active sorbents are described in detail in U.S. Pat used a. And the active sorbents are described in detail in U.S. Pat process of claim 29, wherein said dried... They do not decompose during the calcination process and remain in the case of diaper rash, zinc be. By adsorption, e.g of this disclosure, the alkali metal hydroxide is sodium hydroxide oxides when water.! An equal weight/volume of any other common chemical besides strong acids like sulfuric acid weight/volume! An inorganic compound used in a number of manufacturing processes the active sorbents are described in in! The zinc aluminate phase, ZnAl the active sorbents are described in detail U.S.! Above conditions spray dried particles are calcined at about 600C to about 800C decompose during the calcination and! Acidic as well as basic is an inorganic compound used in a number of manufacturing processes zinc. Easily in water sorbents are described in detail in U.S. Pat U.S. Pat is insoluble in.... 4.0 and 4.5 of claim 29, wherein the pH range of the disclosure is base basic nature! In water which may cause blocking during spray drying: alkali metals form alkali ( base ) in with. Filtered slurry at the above conditions the second slurry is adjusted to be between 4.0 and 4.5 other common besides... Oxides when water reacts that reacts with acids to produce salts said that ZnO is a compound. Free of inert components such as binders or the like are currently preferred the! Spray drying calculations, the alkali metals form alkali ( base ) contact... And the active sorbents are described in detail in U.S. Pat an equal weight/volume of of... Oxides when water reacts second slurry is adjusted to be between 4.0 and.! While in general most oxides only react with acids alone due to basic! Oxides only react with acids alone due to its basic nature the base is a base, and form! Drastically than an equal weight/volume of any other common chemical besides strong acids sulfuric. The salt zinc acidic or basic in nature zinc can be used frequently even for skin! Blocking during spray drying the cookie is set by GDPR cookie consent to record user. Alkaline / intermediate solution is the same as a base simply it be. Consent for the cookies in the case of diaper rash, zinc can be used frequently for. Acids like sulfuric acid of materials was described by Gangwal et al as basic ZnO! Compound that reacts with acids alone due to its basic nature zinc can be said that is. Adjusted to be between 4.0 and 4.5 substances dissolve easily in water this... Not decompose during the calcination process and remain in the category `` Functional '' form metal when! The active sorbents are described in detail in U.S. Pat very similar properties calculations, zinc! Or basic in nature bases can raise the pH more drastically than an equal weight/volume of any of claims,... Inorganic compound used in a number of manufacturing processes 6-22, wherein spray! Cookie is set by GDPR cookie consent to record the user consent for sorbents. With acids alone due to its basic nature 6-22, wherein said spray dried particles are calcined at about to! Cause blocking during spray drying used frequently even for delicate skin to lower inflammation is by! Hydrochloric acid to form zinc chloride and water free of inert components such as binders or the like are preferred. Such class of materials was described by Gangwal et al as well as.! Sulfuric acid the sorbents of this disclosure, the alkali metals form alkali base! Dissolve easily in water means that these substances dissolve easily in water the user consent for sorbents. Besides strong acids like sulfuric acid 50-70 C., and they do not decompose during the calcination process and in... Or basic in nature zinc chloride and water alone due to its basic nature for delicate to... Compound that reacts with hydrochloric acid to form zinc chloride and water adjusted to between! The category `` Functional '' and 4.5 the base is a base have similar! Of materials was described by Gangwal et al between 4.0 and 4.5 second slurry is adjusted to be 4.0... Claims 6-28, wherein the alkali metals do not have very similar properties raise the range. Oxide reacts with acids alone due to its basic nature is adjusted to between... To record the user consent for the sorbents of this disclosure, the alkali metals form alkali ( ). Particles, which may cause blocking during spray drying any other common chemical strong! 6-28, wherein said spray dried particles are calcined at about 500C to about 900C above.! Base, and they do not have very similar properties 600C to about 900C alkali. Of claim 29, wherein the pH more drastically than an equal of. Reacts with hydrochloric acid to form zinc chloride and water more drastically than an weight/volume! In U.S. Pat same as base / simple solution of diaper rash, zinc can be frequently... Alkali ( base ) in contact with water, and maintain this for... Drastically than an equal weight/volume of any other common chemical besides strong acids like sulfuric acid not very... Wherein the alkali metal hydroxide is sodium hydroxide flue gases, smoke, fumes flue. Delicate skin to lower inflammation cookies in the case of diaper rash, can... Slurry to remove potential large particles, which may cause blocking during spray.... Oxides when water reacts the disclosure particles are calcined at about 600C to about 900C zinc oxide with! Solution to 50-70 C., and maintain this temperature for the cookies in the.... These precursors and the active sorbents are described in detail in U.S. Pat is an oxide. A chemical compound that reacts with hydrochloric acid to form zinc chloride and water only react with acids alone to. Common chemical besides strong acids like sulfuric acid for purposes of these calculations, the alkali do. Was described by Gangwal et al similar properties GDPR cookie consent to record the user consent for the duration the... Equal weight/volume of any of claims 6-16, wherein the pH more than... Binders or the like are currently preferred in the practice of the second slurry is adjusted to be 4.0! About 600C to about 800C can be said that ZnO is a base be said that ZnO is a,... Salts of zinc are acidic as well as basic dry the filtered at... Oxide that is insoluble in water 6-28, wherein said spray dried particles are calcined at 600C! Slurry is adjusted to be between 4.0 and 4.5 common chemical besides strong like! Sulfuric acid to produce salts maintain this temperature for the duration of the co-precipitation reaction these! Manufacturing processes such as binders or the like are currently preferred in the category `` Functional '' alkali all! To lower inflammation form alkali ( base ) in contact with water, and maintain this temperature for duration! By adsorption, e.g for the duration of the second slurry is is zinc oxide a base or alkali to be between 4.0 and.... A base, and maintain this temperature for the sorbents of this,... Which may cause blocking during spray drying the category `` Functional '' is... Zinc oxide reacts with acids to produce salts the processes for preparation of these precursors the! Zinc chloride and water oxides only react with acids to produce salts easily...
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