9 results about "Disulfite" patented technology

Described herein are methods and systems for increasing the injectivity of wells used to inject water or water containing various chemicals such as water-soluble polymers for the purpose of increasing the recovery of hydrocarbons such as crude oil from a hydrocarbon-bearing formation. Injectivity often decreases because of adverse reactions or plugging at or near the wellbore. The treatment procedure involves injecting reducing agents (e.g., sulfite or metabisulfite salts) dissolved in water or water containing other chemicals such as polymers.

Described herein are methods and systems for increasing the injectivity of wells used to inject water or water containing various chemicals such as water-soluble polymers for the purpose of increasing the recovery of hydrocarbons such as crude oil from a hydrocarbon-bearing formation. Injectivity often decreases because of adverse reactions or plugging at or near the wellbore. The treatment procedure involves injecting reducing agents (e.g., sulfite or metabisulfite salts) dissolved in water or water containing other chemicals such as polymers.

The invention provides the use of a modified saccharide as a water-reducing additive for concrete, wherein the modified saccharide is selected from glucose syrup, high maltose corn syrup, high fructose corn syrup, dextrins, sugar alcohols and combinations thereof. The modified saccharide is used together with one or more supplemental active agent comprising a metabisulphite salt, optionally in combination with a gluconate. The modified saccharide makes up 50 wt % or more of the active agents used as water-reducing additives.

The present invention relates to a stabilized composition with significantly improved shelf-life stability. More specifically, the present invention relates to a stable liquid aqueous pharmaceutical composition comprising cyticine or a pharmaceutically acceptable salt thereof, at least one antioxidant selected from the group consisting of sulfite compounds, bisulfite compounds, and pyrosulfite compounds. The present invention also relates to the use of at least one antioxidant selected from the group consisting of sulfite compounds, bisulfite compounds, and pyrosulfite compounds for stabilizing a liquid aqueous pharmaceutical composition comprising cyticine.

The invention relates to a tin electroplating bath comprising tin ions; titanium ions as a reducing agent suitable for reducing tin ions to metallic tin; and at least one compound selected from the group consisting of sulfite, dithiosulfonate, thiosulfate, tetra-thiosulfonate, polythiosulfonate, pyrosulfite, sulfide, disulfide, polysulfide, elemental sulfur or mixtures thereof. The invention further discloses a method for depositing tin or tin alloys on a substrate surface. The tin electroplating bath is particularly suitable for use in the electronics and semiconductor industry.

The application provides a method for promoting acid production of excess sludge anaerobic fermentation, and relates to the technical field of environmental protection. The method for promoting acid production of excess sludge anaerobic fermentation comprises the following steps: performing natural sedimentation and concentration treatment on excess sludge to obtain concentrated sludge; performing pretreatment on the concentrated sludge by using pyrosulfite to obtain pretreated sludge; and performing anaerobic fermentation on the pretreated sludge to produce acid. The application provides a method for pretreating excess sludge by using pyrosulfite, promoting anaerobic digestion and hydrolysis of excess sludge, and strengthening production of volatile organic acid, which saves sludge disposal cost, reduces potential risks of the sludge to the environment, realizes sludge reduction, resource utilization and harmless treatment, and the obtained volatile organic acid can be reused to a biological system in a sewage treatment process as a carbon source, thereby relieving the problem of insufficient carbon source in domestic sewage treatment, reducing purchase of additional carbon source, and reducing sewage treatment cost.

To provide a hair cleansing agent composition that offers excellent smoothness during shampooing and superior appearance stability that suppresses discoloration over time, and a method for improving the appearance stability of a hair cleansing agent composition. [Solution] The hair cleansing composition of the present invention contains (A) an acyl amino acid-based anionic surfactant and (B) one or more selected from the group consisting of sulfites, pyrosulfites, nitrites, and pyrosulfites. In addition, the amount of component (A) in the hair cleansing composition of the present invention may be 0.01 to 25.0% by mass of the total hair cleansing composition, and the amount of component (B) may be 0.001 to 1.0% by mass of the total hair cleansing composition.

The invention belongs to the technical field of environmental engineering, and particularly relates to a gradient enrichment and separation treatment method for heavy metal wastewater. The method comprises the following steps: mixing the heavy metal wastewater with pyrosulfite and water-soluble ferric salt, and adding alkali to adjust the pH value to 5-5.5 to obtain chromium slag and first treated wastewater; mixing the first treated wastewater with a thiourea solution, and adding alkali to adjust the pH value to 6.2-6.8 to obtain copper slag and second treated wastewater; mixing the second treated wastewater with a carbonate solution, and adding alkali to adjust the pH value to 8.5-9 to obtain zinc slag and third treated wastewater; and mixing the third treated wastewater with the sludge seed crystal, and sequentially carrying out first-stage alkali addition to control the pH value to be 9.5-10 and second-stage alkali addition to control the pH value to be 11-11.5 to obtain nickel slag. According to the method, efficient separation of multiple metals is realized, and each metal forms a single high-purity precipitate, so that subsequent resource utilization is facilitated. A large amount of coagulant does not need to be added, and economic benefits are improved.

The invention provides a secondary battery and an electronic device. The secondary battery comprises a positive electrode, a negative electrode, a diaphragm and an electrolyte, the positive electrode comprises a current collector, and a bottom coating and a positive electrode active material layer which are sequentially arranged on the current collector; the bottom coating comprises a polymer A and conductive particles which are uniformly distributed, the polymer A is non-conductive, the average particle size of the polymer A is less than 2m, and the melting point of the polymer A is 75-138 DEG C; the electrolyte comprises cyclic carbonate, a component A and a component B, the component A comprises at least one of lithium difluorophosphate, lithium fluorosulfonate and lithium tetrafluoroborate; and the component B comprises at least one of 1, 3-propane sultone, 1, 4-butane sultone, 1, 3-propene sultone, methylene methanedisulfonate, ethylene sulfate, propylene sulfate, methyl ethylene sulfate and cyclic carbonate ethylene sulfate, and the component B comprises at least one of 1, 3-propane sultone, 1, 4-butane sultone, 1, 3-propene sultone, methylene methanedisulfonate, ethylene sulfate, propylene sulfate, methyl ethylene sulfate and cyclic carbonate ethylene sulfate. The secondary battery provided by the invention has excellent low-temperature internal resistance, high-temperature cycle performance and safety characteristic.