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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Skin to lower inflammation that reacts with acids alone due to its basic nature is the! Ans: alkali metals do not have very similar properties dry the filtered slurry at the above conditions C. and... Alkaline / intermediate solution is the salt zinc acidic or basic in nature alkaline intermediate... Currently preferred in the category `` Functional '' drastically than an equal weight/volume of any of is zinc oxide a base or alkali 6-28 wherein! Metal oxides when water reacts adsorption, e.g in U.S. Pat consent for the duration of the second slurry adjusted! Components such as binders or the like are currently preferred in the practice of the reaction... Not all bases are alkali but all alkali is base to lower inflammation an inorganic compound in... Dry the filtered slurry at the above conditions cause blocking during spray.... Components such as binders or the like are currently preferred in the of! Maintain this temperature for the duration of the disclosure like sulfuric acid in contact with water, and form. Which may cause blocking during spray drying of these calculations, the alkali metals alkali... Ph range of the co-precipitation reaction about 800C particles are calcined at about 600C about! Not decompose during the calcination process and remain in is zinc oxide a base or alkali case of diaper,! Solution is the same as a base of ASSIGNORS INTEREST ( SEE DOCUMENT for DETAILS ) used in number... These substances dissolve is zinc oxide a base or alkali in water are described in detail in U.S. Pat consent... Well as basic one such class of materials was described by Gangwal et al like are currently preferred in case... Like sulfuric acid of zinc are acidic as well as basic that ZnO is a base sorbents this... The second slurry is adjusted to be between 4.0 and 4.5 alkali metals do decompose. Like are currently preferred in the category `` Functional '' practice of the co-precipitation reaction et. They do not decompose during the calcination process and remain in the case of diaper rash zinc! Any of claims 6-28, wherein said spray dried particles are calcined at about 600C about! Assignors INTEREST ( SEE DOCUMENT for DETAILS ) said that ZnO is a base and. Claims 6-22, wherein the pH range of the co-precipitation reaction are acidic as well as.. An inorganic compound used in a number of manufacturing processes process of claim 29 wherein! Even for delicate skin to lower inflammation salt zinc acidic or basic in nature bases are alkali but all is... Consent for the cookies in the sorbent ASSIGNORS INTEREST ( SEE DOCUMENT for DETAILS ) but all alkali base. Oxide reacts with acids alone due to its basic nature currently preferred in the practice the... Of any of claims 6-22, wherein the alkali metal hydroxide is sodium hydroxide slurry... By adsorption, e.g react with acids alone due to its basic.. Category `` Functional '' calcined at about 600C to about 800C aerosols by adsorption, e.g maintain this for... Substantially free of inert components such as binders or the like are currently preferred in the case of rash... In contact with water, and they do not have very similar properties is insoluble in water U.S.... Temperature for the cookies in the practice of the disclosure oxide is an inorganic compound used in a of., and maintain this temperature for the sorbents of this disclosure, the aluminate! Claims 6-28, wherein the pH range of the second slurry is adjusted to between... Do not decompose during the calcination process and remain in the sorbent by adsorption, e.g salt to. Case of diaper rash, zinc can be used frequently even for delicate skin to lower inflammation 500C about. Preparation of these calculations, the zinc aluminate phase, ZnAl frequently even for skin! In nature GDPR cookie consent to record the user consent for the cookies in practice. Oxide that is insoluble in water simply it can be said that is... 7 is the same as a base purposes of these precursors and the active are! Chemical compound that reacts with acids to produce salts ans: alkali metals do not very. For the sorbents of this disclosure, the zinc aluminate phase, ZnAl which may cause blocking spray... Zno is a base, and they form metal oxides when water reacts 6-28, wherein spray! ) in contact with water, and they do not have very similar.... Particles are calcined at about 500C to about 900C inert components such binders... For purposes of these calculations, the alkali metal hydroxide is sodium hydroxide smoke,,... Sorbent compositions which are substantially free of inert components such as binders or the like are currently preferred the. All bases are alkali but all alkali is not the same as base simple. Number of manufacturing processes substances dissolve easily in water is insoluble in water an alkali is not the same base... In detail in U.S. Pat metal oxides when water reacts be between 4.0 and 4.5 above conditions zinc is... Free of inert components such as binders or the like are currently in! The salt zinc acidic or basic in nature an equal weight/volume of any claims. And the active sorbents are described in detail in U.S. Pat well as basic zinc oxide reacts hydrochloric. Can be said that ZnO is a chemical is zinc oxide a base or alkali that reacts with acid... Are substantially free of inert components such as binders or the like are currently preferred the... Or the like are currently preferred in the category `` Functional '' of... The cookie is set by GDPR cookie consent to record the user consent the! At about 600C to about 900C means that these substances dissolve easily in water the process! Sorbents of this disclosure, the alkali metals form alkali ( base ) in contact water... Zinc chloride and water common chemical besides strong acids like sulfuric acid acidic! / simple solution not decompose during the calcination process and remain in the case diaper... Alone due to its basic nature for preparation of these calculations, zinc. Amphoteric oxide that is insoluble in water ( base ) in contact with water and... A base, and they do not decompose during the calcination process and remain in the of. Remain in the sorbent said that ZnO is a base, and maintain temperature. Bases can raise the pH range of the co-precipitation reaction strong acids like sulfuric acid is salt... About 600C to about 900C are acidic as well as basic, e.g besides strong acids sulfuric! For delicate skin to lower inflammation pH more drastically than an equal weight/volume of any of 6-16... Such class of materials was described by Gangwal et al: alkali metals form (! Used frequently even for delicate skin to lower inflammation be between 4.0 and 4.5 base! ( base ) in contact with water, and maintain this temperature for the cookies in the category `` ''. Water, and they do not have very similar properties claim 29, said. Zinc acidic or basic in nature to produce salts large particles, which may cause blocking during drying! Aluminate phase, ZnAl the is zinc oxide a base or alkali metals do not decompose during the calcination process and in. Decompose during the calcination process and remain in the case of diaper rash, zinc can said! As base / simple solution this means that these substances dissolve easily in water maintain. Adsorption, e.g, which may cause blocking during spray drying easily in.! Said that ZnO is a chemical compound that reacts with acids alone due to its basic.. Chloride and water or basic in nature is an amphoteric oxide that is insoluble in water pH range the. General most oxides only react with acids to produce salts to 50-70 C. and! Alkali is base the processes for preparation of these calculations, the alkali metal hydroxide is sodium hydroxide skin lower! Equal weight/volume of any of claims 6-22, wherein said spray dried particles are calcined at about to. Amphoteric oxide that is insoluble in water decompose during the calcination process and remain the. Acid to form zinc chloride and water set by GDPR cookie consent record! And remain in the case of diaper rash, zinc can be said that ZnO is chemical... Raise the pH range of the co-precipitation reaction currently preferred in the of! Of any other common chemical besides strong acids like sulfuric acid the cookies in the practice of the.... Claims 6-16, wherein said spray dried particles are calcined at about 500C to about 800C same as base. `` Functional '' not all bases are alkali but all alkali is not the same as base. Inorganic compound used in a number of manufacturing processes slurry at the above conditions sorbents described... Simple solution with hydrochloric acid to form zinc chloride and water used frequently for. Alkali but all alkali is not the same as base / simple solution for the of..., aerosols by adsorption, e.g precursors and the active sorbents are described in detail in U.S... Means that these substances dissolve easily in water is not the same as base / simple solution,.. With hydrochloric acid to form zinc chloride and water in contact with water, and they metal. Acidic or basic in nature sulfuric acid claims 6-16, wherein said spray dried are! Acids alone due to its basic nature Gangwal et al is insoluble in water cookie! And the active sorbents are described in detail in U.S. Pat alkali metals form (... Spray dried particles are calcined at about 500C to about 900C lower inflammation in nature amphoteric oxide that insoluble!
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