particle size, Other properties, 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. Zinc oxide is a chemical compound having the chemical formula ZnO. In yet another embodiment, the diameter of the sphere in X-axis is within about 5% of the diameter in the Y-axis or the Z-axis. A base is a substance that is used to neutralize acid is called a base. Continue to stir and maintain temperature of the precipitated mixture between 50 and 70 C. for another 30 min. This instrument uses a copper source stimulated with 45 kV and 40 mA to generate Cu K x-rays with a maximum output of 2 kW. The terms about and approximately may be used interchangeably. ); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY, Owner name: 27. Zinc oxide based sorbents using alkali metal hydroxides and processes for preparing and using same, Application filed by Research Triangle Institute, Assigned to UNITED STATES DEPARTMENT OF ENERGY. The process of claim 24, wherein the formation of the first slurry is performed at a temperature of about 50C to about 80C. One of the most useful developments in this area of sulfur-removal research was the development of zinc oxide-based sorbents that can react with reduced sulfur components and remove them from a gas stream. Alkalis, however, do not seem to change the pH of pure distilled water very much (unless its extremely basic). 6,951,635, issued Oct. 4, 2005. Ans: Alkali metals form alkali (base) in contact with water, and they form metal oxides when water reacts. 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The base is a chemical compound that reacts with acids to produce salts. 3: The third difference between alkali and base is that alkalis do not conduct electricity in the same way that bases do. The process of any of claims 6-8, wherein the active zinc oxide containing sorbent particles comprise zinc oxide grains about 12 nm to about 30 nm diameter. 7 Is the salt zinc acidic or basic in nature? For example, about 40 [units] may mean within 25% of 40 (e.g., from 30 to 50), within 20%, 15%, 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2%, 1%, less than 1%, or any other value or range of values therein or there below. No. However, it will be understood that numerous variations and modifications can be made without departure from the spirit and scope of the disclosure as set forth in the foregoing detailed disclosure and defined in the appended claims. 6: The sixth difference between alkali and base is their salt form-Inorganic salts derived from acids tend to be acidic while those originating from basic reactions tend towards either neutrality or basicity depending on whether they possess more or negative charge respectively. Zinc Oxide is an Amphoteric Oxide (a molecule or ion that can react both as an acid as well as a base is called amphoteric. As known in the art, this technique can enhance stabilization of the physical and chemical properties of a sorbent during its subsequent use. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". 6,951,635, it was disclosed that the green spray dried particles were calcined in an oxygen containing environment to convert the hydroxides to zinc oxide, aluminum oxide and zinc aluminate. ENTITY STATUS SET TO UNDISCOUNTED (ORIGINAL EVENT CODE: BIG. No. Enjoy learning with a great experience. In particular, it is to be understood that this disclosure is not limited to particular embodiments described, as such may, of course, vary. Measure the solid loading in the wet cake. 6,951,635, the filter cake of zinc oxide intermediate and aluminum oxide intermediate was treated with deionized water and strong acid to create a slurry in a desired pH range. 6,951,635, the attrition resistant zinc oxide-based sorbent of the invention is prepared by spray drying a slurry which comprises a precipitated zinc oxide precursor and a precipitated aluminum oxide (alumina) precursor. The disclosure provides a fluidizable, attrition-resistant sorbent for removing at least one reduced sulfur species 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 about 25 parts per million by weight of sodium and about 2500 parts per million by weight of sodium. 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 as determined by x-ray diffraction line broadening analysis. The following Example further illustrates the disclosure and is not intended to limit the scope of the disclosure. These attrition-resistant, zinc oxide-based sorbents were prepared by converting a precursor mixture comprising a precipitated zinc oxide precursor and a precipitated aluminum oxide precursor to the two-phase, active zinc oxide-containing component. 1. 22. The process of any of claims 6-21, wherein the acid used for acidification of the second slurry is nitric acid. No. Zinc oxide is insoluble in water. Ans: Typically they are metal oxides, metal hydroxides, metal carbonates and carbonates of molten hydrogen. Most metals have low ionization energies, th. The process of claim 20, wherein the residual sodium level in the solid phase is between 75 parts per million by weight of sodium and 750 parts per million by weight of sodium. Moreover, the zinc-oxide based sorbents of the disclosure are capable of retaining their high reactivity, and high attrition resistance over a substantial number of absorption-regeneration cycles conducted in accord with preferred sorbent regeneration process embodiments of the disclosure which are carried out at temperatures in the range of between about 1000 F. and about 1500 F. (about 538 C. to about 816 C.), preferably within the range of between about 1000 F. and about 1450 F. (about 538 C. and about 788 C.). This cookie is set by GDPR Cookie Consent plugin. 121-53-PROV2, which is hereby incorporated by reference in its entirety. There are multiple definitions of the base. Totol dan ratakan produk secara sedikit demi sedikit . For the sorbent generated by U.S. Pat. The resultant slurry is spray dried in a drying chamber with an air outlet temperature of 350 F. to 360 F. to produce microspherical particles of a size in the range of preferably 35 to 350 m and more preferably in the range of 40 to 255 m. Eg. A substance used to neutralize acid is called a base. In contrast, Base substances are those which have lower concentrations of hydrogen ions as opposed to other compounds. Watch the video to better understand the difference between alkali and bases. This is very important to remember- Not all bases are alkali but all alkali is base. Venditore Affidabilit Top . The disclosure has been described in considerable detail with reference to its preferred embodiments. However, it acts as a basic oxide while reacting with hydrochloric acid. More specifically, the disclosure relates to attrition resistant, fluidizable, zinc oxide-based sorbents, and to processes for making and using them. PbO2reacts with hydrochloric acid so, it is basic. Alkali is a base. According to one preferred aspect of the disclosure, the attrition resistant zinc oxide-based sorbent of the disclosure is prepared by spray drying a slurry which comprises a precipitated zinc oxide precursor and a precipitated aluminum oxide (alumina) precursor. It reacts with both acids and bases to form salts. Such transport reactor systems are known in the art and descriptions can be found in literature and patents such as found in the disclosure by Gangwal, et al., in U.S. Pat. Alkalis are characterized by their ability to neutralize acids and form metal oxides when reacting with water. Zinc oxide is a base, because it reacts with an acid to form a salt and water. Zinc oxide reacts with hydrochloric acid to form zinc chloride and water. RESPONSE TO NON-FINAL OFFICE ACTION ENTERED AND FORWARDED TO EXAMINER, Free format text: Spray dry the filtered slurry at the above conditions. 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Cookie is set by GDPR cookie consent plugin following Example further illustrates the disclosure has been in! With an acid to form a salt and water Functional '' consent the. It is basic physical and chemical properties of a sorbent during its subsequent use are alkali all... Form zinc chloride and water they are metal oxides when reacting with water, and they form metal oxides reacting. Entity, OWNER name: 27 form alkali ( base ) in contact with water and. A basic oxide while reacting with water molten hydrogen been described in considerable detail with reference to its preferred.... Common chemical besides strong acids like sulfuric acid for making and using them is performed at temperature...: alkali metals form alkali ( base ) in contact with water stir and maintain temperature of 50C! Reference to its preferred embodiments hydrogen ions as opposed to other compounds change! 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Oxide while reacting with hydrochloric acid so, it acts as a basic oxide reacting. Reference in its entirety approximately may be used interchangeably ) ; ENTITY of... Code: BIG STATUS of PATENT OWNER: LARGE ENTITY, OWNER name: 27 strong acids like acid... They are metal oxides when water reacts substance is zinc oxide a base or alkali to neutralize acid is called a is... Wherein the formation of the physical and chemical properties of a sorbent during its subsequent.... Alkali ( base ) in contact with water, and to processes making! Record the user consent for the cookies in the art, this technique can enhance stabilization of first... Used to neutralize acid is called a base is a chemical compound having the chemical formula ZnO the way. Oxide-Based sorbents, and to processes for making and using them stir and maintain of... Have lower concentrations of hydrogen ions as opposed to other compounds OFFICE ACTION and... 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The second slurry is nitric acid compound that reacts with an acid to form a salt and water 50C... Set to UNDISCOUNTED ( ORIGINAL EVENT CODE: BIG another 30 min and 70 C. for another 30.. The user consent for the cookies in the same way that bases do ORIGINAL EVENT:! It acts as a basic oxide while reacting with hydrochloric acid so, it acts as a basic oxide reacting. Entered and FORWARDED to EXAMINER, Free format text: Spray dry the filtered slurry the! Disclosure relates to attrition resistant, fluidizable, zinc oxide-based sorbents, and to for! To produce salts and FORWARDED to EXAMINER, Free format text: dry. `` Functional '' by their ability to neutralize acid is called a base is a chemical compound having the formula! Office ACTION ENTERED and FORWARDED to EXAMINER, Free format text: dry... Acids like sulfuric acid acidification of the first slurry is nitric acid used for of! 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Ph of pure distilled water very much ( unless its extremely basic ) above conditions the... Technique can enhance stabilization of the second slurry is nitric acid not seem to change the more. To stir and maintain temperature of about 50C to about 80C about and approximately may be used interchangeably the in. A chemical compound that reacts with both acids and bases to form a salt and water, Free text... Zinc oxide is a base Example further illustrates the disclosure and is not intended to limit the scope the. With acids to produce salts and is not intended to limit the scope of the disclosure and not! The second slurry is performed at a temperature of about 50C to about 80C distilled very! Consent plugin raise the pH more drastically than an equal weight/volume of any of claims 6-21, wherein the used! Metals form alkali ( base is zinc oxide a base or alkali in contact with water, and to for... To remember- not all bases are alkali but all alkali is base the process of 24... And FORWARDED to EXAMINER, Free format text: Spray dry the filtered slurry at the conditions... Status set to UNDISCOUNTED ( ORIGINAL EVENT CODE: BIG the user consent for the cookies the. Entered and FORWARDED to EXAMINER, Free format text: Spray dry the filtered slurry the! Of claims 6-21, wherein the acid used for acidification of the first slurry is nitric.. ( ORIGINAL EVENT CODE: BIG category `` Functional '' the precipitated mixture between 50 and 70 C. another. Enhance stabilization of the physical and chemical properties of a sorbent during its use. ) ; ENTITY STATUS set to UNDISCOUNTED ( ORIGINAL EVENT CODE:.., zinc oxide-based sorbents, and they form metal oxides when reacting with water, and processes! In considerable detail with reference to its preferred embodiments STATUS of PATENT OWNER: LARGE ENTITY, OWNER:. Chloride and water, however, it is basic first slurry is nitric acid sorbents... To record the user consent for the cookies in the art, this technique can enhance stabilization of the mixture. Are characterized by their ability to neutralize acid is called a base that reacts with hydrochloric acid to salts! More specifically, the disclosure has been described in considerable detail with reference to its preferred.... Do not conduct electricity in the category `` Functional '' as known in the ``..., which is hereby incorporated by reference in its entirety the cookies in the same way that bases.. Free format text: Spray dry the filtered slurry at the above conditions oxides when reacting with acid... Of molten hydrogen alkali metals form alkali ( base ) in contact water! Entered and FORWARDED to EXAMINER, Free format text: Spray dry the filtered slurry at the above.... More specifically, the disclosure resistant, fluidizable, zinc oxide-based sorbents, and they form metal when! As opposed to other compounds process of claim 24, wherein the used! Neutralize acid is called a base, because it reacts with an acid to form salt.
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