Sodium sulfite

About: Sodium sulfite is a research topic. Over the lifetime, 2548 publications have been published within this topic receiving 18523 citations. The topic is also known as: Na2SO3 & Anhydrous sodium sulfite.

A film, and method of forming, for in-situ controlled production of so2 gases

Abstract: A method for producing a film for emitting sulfur dioxide, and the film produced thereby, wherein the method comprises the steps of simultaneously extruding a plurality of layers of polymers, wherein a first one of the layers contains a mixture comprised of sodium metabisulfite, sodium bisulfite or sodium sulfite in a powder dispersion, a second one of the layers containing a dispersion of an acid or an acid anhydride

Device for preparing sodium metabisulfite and anhydrous sodium sulfite

Abstract: The utility model provides a device for preparing sodium metabisulfite and anhydrous sodium sulfite. The device comprises a sodium metabisulfite preparation system and an anhydrous sodium sulfite preparation system which are simultaneously connected with a sulfur dioxide gas total pipeline. A three-stage series connection countercurrent absorption structure is adopted by the sodium metabisulfite preparation system, and a secondary spray absorption structure is adopted by the anhydrous sodium sulfite preparation system. According to the device, sulfur dioxide gas generated by calcinations of sulphide ores is utilized to produce the sodium metabisulfite and the anhydrous sodium sulfite, manufacturing cost of the sodium metabisulfite and the anhydrous sodium sulfite is reduced, the utilization rate of pyritic resources is improved, the structure is reasonable, and energy conservation and environment protection are achieved.

Application of a novel heterogeneous sulfite activation with copper(i) sulfide (Cu2S) for efficient iohexol abatement

Abstract: Transition metal ion-activated sulfite autoxidation processes for the production of sulfate radicals (SO4˙−) have been widely investigated to achieve efficient abatement of recalcitrant organic pollutants. However, these homogeneous processes suffered from narrow effective pH range and metal release, thus restricting their practical application. In order to address this problem, we report a simple and efficient approach to iohexol abatement by a combined Cu2S and sulfite process (simplified as Cu2S/sulfite process) based on the superior activation performance of copper and the excellent electron donating capacity of the low-valent sulfur species. Compared with typical copper oxides, Cu2S can significantly accelerate the sulfite autoxidation to generate radicals, leading to 100% iohexol abatement in the Cu2S/sulfite process. The influence of solution pH and dissolved oxygen on iohexol abatement is also investigated. Qualitative and quantitative analysis of reactive radicals is performed by electron paramagnetic resonance (EPR) and radical quenching experiments. Generation of SO4˙− from sulfite activation with Cu2S mainly contributes to the iohexol abatement. X-ray photoelectron spectroscopy (XPS) suggests that copper is the main activation site and the reductive sulfur species can achieve the continuous regeneration of copper. Application potential of the Cu2S/sulfite process is also assessed. This study provides a new method for the treatment of water and wastewater containing organic micropollutants.

Mixing agent for soil amelioration and soil amelioration method

Abstract: PROBLEM TO BE SOLVED: To execute a soil amelioration of sludge, the sludge high in water content especially and to utilize the sludge effectively. SOLUTION: A mixing agent consisting of nickel sulfate, a surfactant and either one kind among potassium chloride, calcium chloride, magnesium sulfate, potassium permanganate, sodium sulfate or sodium sulfite is mixed to sludge together with cement or an ettringite forming auxiliary such as fly ash at need and the mixture is solidified.