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.

Reductive Acylation of Nitroarenes to Anilides by Sodium Sulfite in Carboxylic Acids

Abstract: A facile and efficient reductive acylation of aromatic nitro compounds to corresponding anilides using a sodium sulfite–carboxylic acid system for the first time has been reported. The sodium sulfi...

Producing method for bright yellow anti-myopia health-care paper

Abstract: This invention refers to a kind of peak yellow health-care paper protecting from myopia, and its preparation The process includes crushing wheat stalk, mixing sodium sulfite, sodium hydroxide and anthraquinone with wheat stalk fibers, steam-boiling the said mixture in water to form paper pulp materials, sifting out them to remove impurities, adding liquid chlorine, sodium hydroxide and sodium hypochlorite into them, heating to bleach pulp materials, pulverizing pulp materials; Adding alkali peak yellow, acid violet, aluminum sulphate, rosin glue, dithionite oil etc into pulp materials, diluting paper pulp with water in order to adjust colour, putting paper pulp on shaped net according to meet finished paper thickness, heating and drying to get products This health-care paper is peak yellow, pretty and without lost fresh and hurt eyes Its surface is smoothness, water tolerance and oil tolerance, and physical strength and surface strength reaching the write paper standard

Crosslinking of chlorinated polyethylene

Abstract: PURPOSE: To crosslink a chlorinated polyethylene at normal temperature and pressure, by reacting the chlorinated polyethylene with an aminoorganosilane compound and, then, contacting the resulting product with water in the presence of a silanol condensation catalyst. CONSTITUTION: First, a crosslinkable silane-grafted chlorinated polyethylene is prepared by reacting a chlorinated polyethylene with an aminoorganosilane compound. The resulting silane-grafted chlorinated polyethylene is molded by a method such as extrusion. The extrudate can be crosslinked by contacting it with water in the presence of a silanol condensation catalyst. In this case, crosslinking can be effected satisfactorily even by the atmospheric moisture. It is also effective to mix the silane- grafted chlorinated polyethylene directly with a water-releasing compound and, then, mold the mixture. As the above water-releasing compounds, there can be mentioned sodium sulfate, magnesium sulfate and sodium sulfite. COPYRIGHT: (C)1982,JPO&Japio

Production of antimicrobial agent

Abstract: PURPOSE:To provide a method for producing an antimicrobial agent suitable for using in the form of a mixture with a synthetic resin and excellent in safety. CONSTITUTION:B-form silica gel [Average particle diameter is about 2000mum] is added to a reaction solution between silver acetate, sodium sulfite and sodium thiosulfate so as to support a silver complex on silica gel. The resultant mixture of the thiosulfato silver complex solution and silica gel is heated at 60 deg.C and a reduced pressure of <= about 3000Pa so as to evaporate the solvent components for further drying it. The resultant silver complex-supporting silica gel, methyl alcohol, tetraethoxysilane and ion-exchange water are put in a vacuum dryer and, after completion of hydrolysis of tetraethoxysilane at 60 deg.C, excessive water and alcoholic components are evaporated at 50 deg.C and a reduced pressure of <= about 3000Pa so as to apply a silica coating thereto. The obtained material is dried and crushed, thus producing the antimicrobial agent having about 60mum average particle diameter.

Treatment of waste liquor from pulp production

Abstract: A process and apparatus for treating concentrated spent liquor from a soda-based pulping process to recover sodium for reuse in the pulping process and to prevent the usual pollution of streams and air caused by the usual effluent from the pulping process. The process and apparatus comprises the following steps and apparatus. Concentrated spent liquor containing sodium is mixed with recycled finely-divided reactive alumina hydrate and formed into solid pellets by spraying the concentrated liquor-aluminum hydrate mixture onto a bed of recycled sodium aluminate furnace ash in an enclosed rotating container and tumbling the mixture and ash. The solid pellets are combusted and reacted by feeding the pellets through a furnace operating at a temperature below the fusion temperature of sodium aluminate and at a sufficiently high temperature to combust the organic portion of the pellets and react the sodium content thereof with the alumina to form additional sodium aluminate as a particulate unfused ash. The resulting furnace ash is pulverized and a portion thereof is recycled for subsequent reuse in the treating process. The remaining portion of the ash is dissolved in water to form a solution of sodium aluminate. The sodium aluminate solution is reacted with either sulphur dioxide or carbon dioxide or both to form sodium sulfite and/or sodium carbonate pulping chemical and alumina and alumina is separated for reuse in the treating process.