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296 results about "Dicarbonate" patented technology

In organic chemistry, a dicarbonate, also known as a pyrocarbonate, is a compound containing the divalent [−O−(C=O)−O−(C=O)−O−] or −C₂O₅− functional group, which consists of two carbonate groups sharing an oxygen atom. These compounds can be viewed as double esters of a hypothetical dicarbonic acid, H₂C₂O₅ or HO−(C=O)−O−(C=O)−OH. Two important examples are dimethyl dicarbonate H₃C−C₂O₅−CH₃ and di-tert-butyl dicarbonate (H₃C−)₃C−C₂O₅−C(−CH₃)₃.

Removing Carbon Dioxide From Waste Streams Through Co-Generation of Carbonate and/or Bicarbonate Minerals

Apparatuses and methods for removing carbon dioxide and other pollutants from a gas stream are provided. The methods include obtaining hydroxide in an aqueous mixture, and mixing the hydroxide with the gas stream to produce carbonate and / or bicarbonate. Some of the apparatuses of the present invention comprise an electrolysis chamber for providing hydroxide and mixing equipment for mixing the hydroxide with a gas stream including carbon dioxide to form an admixture including carbonate and / or bicarbonate.
Owner:CARBONFREE CHEM HLDG LLC

Preparation method of ertabeinan sodium salt

A process for preparing Ertapeinan sodium includes such steps as reaction between [4R, 5S, 6S, 8R]-3-[(diphenyl phosphorosoacyl) oxy]-6-(1-hydroxyethyl)-4-methyl-7- oxy-1-azadicyclo [3, 2, 0 hepto-2-ene-2-carboxylate (4-nitrophenyl) methylester and (2S, 4S)-1-(4-nitrobenzyloxycarbonyl)-2-(3-hydroxycarbonylphenylamino formyl) pyrrolidine-4-yl thiol to obtain deprotecting precursor, adding Pd-C catalyst and sodium dicarbonate, and hydrodeprotecting reaction. Its advantages are high output rate and low cost.
Owner:SHANGHAI JIAO TONG UNIV

Process for preparing super activated carbon from nut shell carbon and waste liquid activation treatment method of process

The invention discloses a process for preparing super activated carbon from nut shell carbon and a waste liquid activation treatment method of the process, belonging to the field of biochemical engineering and energy materials. The process comprises the following steps: soaking nut shell carbon which is subjected to pre-washing and thermal treatment A into an oxidization substance in a vacuum reaction kettle; performing thermal treatment B on the nut shell carbon soaked into the oxidization substance, and soaking into an alkali aquo-complex activating agent in the vacuum reaction kettle; in inert gas or reductive atmosphere, heating the nut shell carbon to perform thermal treatment C so as to obtain activated nut shell carbon; adding water to leach and separate the activated nut shell carbon so as to obtain alkali activated mother liquor A and a solid; adding water into the solid for leaching again so as to obtain carbonate mother liquor B and activated carbon slurry; performing multi-stage washing and acidization treatment on the activated carbon slurry, washing with water, and separating so as to obtain a crude activated carbon product; and performing thermal treatment D of different stages on the crude activated carbon product, thereby obtaining an activated carbon product. The super activated carbon with high yield and good properties can be prepared, and meanwhile useful byproducts such as bicarbonate and hydrated silica can be prepared.
Owner:BEIJING UNIV OF CHEM TECH

Image-forming method and developer

The present invention provides a developer comprising at least one carbonate, at least one hydrogen carbonate and at least one alkali silicate, wherein the ratio of the total molar concentration “a” of the carbonate and the hydrogen carbonate to the molar concentration “b” of the SiO2 component present in the alkali silicate: “a/b” ranges from 1:0.3 to 1:2, the total molar concentration of “a” and “b”:“a+b” ranges from 0.1 to 2 mole/L, and the pH value thereof ranges from 9 to 13; and an image-forming method which comprises the steps of imagewise exposing a negative-working image-forming material which comprises a substrate provided thereon with an image-recording layer comprising an infrared light absorber, a polymerization initiator, an ethylenically unsaturated bond-containing monomer and a polymer binder, and then developing the imagewise exposed image-forming material with the foregoing developer. The developer and image-forming method can ensure sufficient developing properties or a satisfactory developing ability at a low pH wherein the image-forming material is hardly damaged. Accordingly, they permit the simultaneous achievement of good printing durability and a good developing ability of an image-forming material. Further, the developing activity of the developer is not hardly reduced due to the action of carbon dioxide and therefore, it does not suffer from a problem originated from the scum formed during development.
Owner:FUJIFILM CORP

Process for preparation of silver oxide

The present invention relates to a process for preparation of silver oxide with various shape and size using a silver complex compound having a special structure. The present invention includes 1) step of preparing a precursor solution including a silver complex compound obtained by reacting a silver compound with one or more mixture selected from the group consisting of an ammonium carbamate-based compound, an ammonium carbonate-based compound or an ammonium bicarbonate-based compound in the presence of a solvent; and 2) step of preparing silver oxide by reacting the precursor solution including the silver complex compound of step 1) with an oxidant. The shape and particle size of the silver oxide prepared according to the preparation process of the present invention can be changed.
Owner:INKTEC CO LTD
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