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.

Effects of Potassium Propyl Xanthate Collector and Sodium Sulfite Depressant on the Floatability of Chalcopyrite in Seawater and KCl Solutions

Abstract: This study demonstrates the effects of a potassium propyl xanthate (PPX) collector and sodium sulfite (Na2SO3) depressant on pure chalcopyrite in synthetic seawater (SSW) and potassium chloride (KCl) solutions. SSW solutions with 35 g/L of salt and 0.01-M KCl were used for microflotation and zeta potential tests. Particles sized between 200# and 100# (75–150 µm) were used, and the pH was between 8.0 and 8.5. The surface of the mineral and its interaction with the collector were characterized using Raman spectrometry. The zeta potential of the chalcopyrite was measured in KCl solution at a pH range of 3–12 using the collector and depressant at a monodispersed particle size of 635# (20 µm). The results indicate that the floatability of chalcopyrite is not affected by the presence of PPX collectors in SSW solutions. SSW provides better recoveries than KCl solutions with values of 91.42% and 88.15%, respectively. The Na2SO3 depressant does not hinder the mineral floatability throughout the entire concentration range used; however, special care must be taken when adjusting the pH range to avoid increasing the zeta potential.

Stabilized liquid preparation for injection containing pemetrexed

Abstract: The present invention relates to a stabilized liquid preparation for injection containing pemetrexed or a pharmaceutically acceptable salt thereof, and more particularly, to a liquid preparation for injection containing pemetrexed, which has improved stability as it comprises one or more types of stabilizing agent(s) selected from sodium sulfide and sodium sulfite. [Representative figure:] Fig. 1.

Alkaline sulfite pulping process with sodium aluminate and anthraquinone

Abstract: An alkaline sulfite pulping process in which the lignocellulosic material is cooked in a solution containing sodium sulfite is provided. Sodium aluminate is used as a buffering agent. As a result of this, the stability of the pH of the cook and the properties of the pulp are improved. The amount of sodium aluminate as NaOH is from 2% to 8% based on the dry weight of the chips. The pulping process is carried out with the addition of a small dosage of anthraquinone, to produce chemically defibered pulps.

Process for removing nitrogen oxides from gaseous mixtures

Abstract: Gaseous mixtures containing nitrogen oxides are contacted with an aqueous solution containing sodium sulfite, trisodium imidobissulfate and sodium sulfate while adjusting the pH thereof by sodium hydroxide or sodium carbonate, and sulfur dioxide is contacted therewith simultaneously or thereafter to produce therein disodium imidobissulfate and sodium hydrogensulfate, and then sodium hydroxide is added therein to deposit sodium sulfate 10 hydrate firstly and trisodium imidobissulfate 1 hydrate secondly, and thereafter the mother liquor is recycled as the absorption medium for nitrogen oxides.

Reduction of disinfected byproduct in membrane separation process

Abstract: PROBLEM TO BE SOLVED: To reduce a disinfected byproduct in transmitted water and conc. water, in a process supplying water to be treated to which chlorine dioxide is added as a sterilizing agent to a reverse osmosis membrane module to separate the same into transmitted water and conc. water, by adding a reducing agent to transmitted water and/or conc. water. SOLUTION: In a seawater desalting apparatus, chlorine dioxide is added to seawater pumped up by an intake pump 1 and sulfuric acid is also added thereto and this seawater is passed through a sand filter tank 4 and a cartridge filter 5 and raised in pressure by a high pressure pump 6 to be supplied to a reverse osmosis membrane module 7. A reducing agent is added to the obtained transmitted water and/or conc. water to remove remaining chlorite ions. As the reducing agent, sodium bisulfite or sodium sulfite is designated but sodium bisulfite is pref. used. The reverse osmosis membrane module 7 to be used is pref. composed of a cellulose triacetate having oxidizing agent resistance and chlorine resistance.