The reduction of simple aldehydes and ketones ( Table 1, Scheme 1) were envisaged and successfully demonstrated utilising sodium dithionite under standard batch conditions by refluxing for 12 hours in the presence of sodium dithionite and sodium bicarbonate (1 M) in an isopropanol/water mixture.
For industrial-level dyeing process, water-insoluble IB must be reduced with stoichiometric amounts of sodium dithionite, using a relation of 4:1 with respect to the dye, becoming its leuco form ...
The selective extractions were simultaneously used to determine iron-bound carbon by measurement of dissolved organic carbon (DOC) in the sodium dithionite …
Studies in Conservation. Abstract Sodium dithionite (SDT) is a reducing agent used in conservation, mainly for iron stain removal from both organic and inorganic substrates, and occasionally to treat corroded copper and silver artifacts. The purpose of this review is to provide information about the use and limitations of SDT, based on its ...
The SO 2 and NO emitted from coal-fired power plants have caused serious air pollution in China. Fe II EDTA complexation technology is one of the most promising processes to realize the simultaneous removal of SO 2 and NO. However, Fe II EDTA is easily oxidized to Fe III EDTA, causing loss of activity, which limits its further application. …
The denim industry uses more than 45,000 tons of synthetic indigo a year, along with over 84,000 tons of sodium hydrosulfite as reducing agent and 53,000 tons …
However, the addition of 0.5% sodium dithionite, a strong reducing agent, to myoglobin solution resulted in the formation of deoxymyoglobin, which was subsequently converted to nitrosomyoglobin ...
The current study presents a complete view of dithionite behaviours in plant waters by considering the dithionite-mineral surface interactions and dithionite-collector interactions in addition to the traditionally agreed on pulp potential alterations.
In this paper,a natural reducing agent is introduced that comes from a plant and have been studied on the substance for comparison it with sodium dithionite on vat, indigo and sulphur dyeing on ...
First highly effective non-catalytic nitrobenzene reduction in UV/dithionite system with aniline production – Advanced reduction process (ARP) approach
HydroBlue. 90. As the inventor of the original Hydrosulfite in 1904, BASF has massively improved heritage with the all-new first-choice dyeing product for leading suppliers of premium denim brands. With long-term stable, odorless, and dustfree dithionite content of 90%, HydroBlue® 90 offers excellent consistent dyeing quality, reliability and ...
The current indigo dye mill process consists of repeatedly dipping ropes of cotton yarn into multiple dye baths containing an aqueous solution of leucoindigo, sodium hydroxide, and sodium dithionite.
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Abstract. Sodium dithionite (SDT) is a reducing agent used in conservation, mainly for iron stain removal from both organic and inorganic substrates, and occasionally to treat corroded copper and ...
Here, we describe a field experiment at an ISR facility in which both a chemical reductant (sodium dithionite) and a biostimulant (sodium acetate) were sequentially introduced into a previously mined …
A traditional reducing agent in an indigo dyeing process with cotton fabrics is sodium dithionite (Na2S2O4) which is environmentally unfavorable because the resulting by-products cause various ...
However, few works were focusing on the dithionite reduction, especially the dithionite detection. This report aimed to review the characteristic of dithionite including the chemical properties ...
Sodium dithionite under nitrogen at 80 °C in a water/benzene mixture and in the presence of a phase transfer catalyst reduces dienoic carboxylic acids and esters in a 1,6-mode.425 Enones such as isophorone, pulegone and carvone are similarly reduced to …
The reduction with sodium dithionite leads to the formation of substantial quantities of waste water and thus led to the development of alternative reduction methods, such as the reduction with ...
Remediation of hexavalent chromium contamination in chromite ore processing residue by sodium dithionite and sodium phosphate addition and its mechanism
The present study investigated whether sodium dithionite could be made viable through the use of different processing parameters, using mannose as a model compound and measuring the yield of ...
The stabilization of water-soluble plant-based leucoindigo on nanocellulose carrier matrix to reduce the excess processing steps, and demonstration of antioxidant …
A comprehensive range of conventional and enhanced sulfites and hydrosulfites (sodium dithionite) for the production of value-added products and the optimization of mill operations.
The Inorganic Chemicals business of BASF is leader in the production and supply of inorganic salts and alcoholates. Often used as functional materials or catalysts in a multitude of applications, inorganic salts and alcoholates are building blocks of performance and value creation in demanding industrial process, as well as in sensitive uses ...
We investigated a method for delivering ferrous iron into the subsurface to enhance chemical reduction of Cr(VI) in chromite ore processing solid waste (COPSW) derived from the production of ferrochrome alloy. The COPSW is characterized by high pH (8.5-11.5) and high Cr(VI) concentrations in the sol …
Dithionite/UV-B advanced reduction process was effective in weakly acidic conditions (pH < 5), and chlorate removal occurred in two steps. The first was an initial rapid decrease in chlorate concentration that occurred before initiating UV irradiation and was attributed to reaction with dithionite decomposition products.
The present study investigated whether sodium dithionite could be made viable through the use of different processing parameters, using mannose as a model compound and measuring the yield of ...
Large amounts of chromite ore processing residue (COPR) wastes have been deposited in many countries worldwide, generating significant contamination issues from the highly mobile and toxic hexavalent chromium species (Cr(VI)). In this study, sodium dithionite (Na2S2O4 …
Sodium dithionite has several applications as a reducing agent, for example, in the reduction of textile dyes for dyeing processes. This reduction is crucial for the process …
In conclusion, a novel fluorescent probe for sodium dithionite has developed on the basis of a specific reduction. The probe, consisting of dicyanomethylene-benzopyran dye and 1-methylquinolinium, exhibited fast response toward SDT with remarkable colorimetric and NIR turn-on fluorescence, large Stokes shift, and high …
Later on, a process was developed which uses the sodium amalgam from the mercury cell electrolysis of sodium chloride solution and converts this directly to sodium dithionite with sulfur dioxide. This process produces a material which is free of heavy metals and therefore stable.
Various chemicals and techniques have been employed for the indigo reduction process. Sodium dithionite (hydrosulfite: Na 2 S 2 O 4) is the most common reducing agent used industrially because of its effective reducing power and its availability in an easy-to-handle solid form.
The current study presents a complete view of dithionite behaviours in plant waters by considering the dithionite-mineral surface interactions and dithionite-collector interactions in addition to ...
Sodium Hydrosulfite, Sodium Dithionite. Sodium hydrosulfite (sodium dithionite, Na 2 S 2 O 4) is an inexpensive and safe reducing agent, which for example enables the reduction of aromatic nitro and diazonium compounds to anilines. Recent Literature. The hydrogenation of α,β-epoxy ketones can be mediated by a catalytic amount of BNA + Br ...
3.1 Substances Synonyms : Sodium dithionite Sodium hypodisulfite Formula : Na2O4S2 Molecular weight : 174.11 g/mol
Treatment of Hexavalent Chromium in Chromite Ore Processing Solid Waste Using a Mixed Reductant Solution of Ferrous Sulfate and Sodium Dithionite
The kinetic modeling was also carried out using a shrinking core model. Results from this study show that simultaneous removal of iron and silica is feasible using an alkaline leaching process, in which sodium dithionite acts as a reducing agent to decompose iron oxides, and the decomposition of kaolinite is performed by oxalic acid.
