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.

Process for refining wheat-straw pulp by hydrogen peroxide enzyme method

Abstract: The invention relates to a process for refining wheat-straw pulp by a hydrogen peroxide enzyme method. A technology combining biological enzyme cold soaking catalytic decomposition with a mechanical mehtod is adopted for forming paper pulp from wheatgrass, grass is softened and dissociated at normal temperature, and fiber with physical indexes which meet the requirements of a conventional papermaking standard is formed through the mechanical mehtod. The process is as follows: soaking and softening the wheatgrass by adopting sodium hydroxide and sodium sulfite for cold soaking, then extruding a soaking solution in the wheatgrass through a screw extruder, washing, dehydrating, then enabling the wheatgrass to react with disodium edetate, sodium borohydride and hydrogen peroxidase in a thread rolling machine for fibrillation, and further forming the wheat-straw pulp required for production through a medium-concentration grinding machine and a high-concentration grinding machine. According to the process, the following raw materials in percentage by weight are used for the absolute dry wheatgrass: 16%-20% of sodium hydroxide, 0.6%-0.9% of sodium sulfite, 0.5%-2% of disodium edetate, 0.1%-0.3% of sodium borohydride and 0.5%-1.39% of hydrogen peroxidase. According to the process disclosed by the invention, biological bleaching and pulping is adopted, black liquor is not produced, a biological dissolution solution for soaking the wheatgrass can be reused for a long time, pulping water can be reused, and the production and the emission of the black liquor can be avoided during the pulping process.

Complexing water-purifying agent

Abstract: The efficient complexing water purifying agent consists of O-type component comprising aluminium sulfate, ferrous sulfate, sulfuric acid and water; K-type component comprising sodium hydroxide, sodium sulfite, sodium hypochlorate and water; and C-type component comprising sodium sulfite, polyacrylamide and water. The water; purifying agent with scientific formulation possesses functions of pH regulation, oxidioreduction and flocculant precipitation, has the features of both inorganic and organic water purifying agent, and can purify various industry and domestic sewage effectively and fast.

Method for recovering iodine from waste liquor containing iodine and/or inorganic iodine compound

Abstract: PURPOSE:To produce a purified iodine product of high purity by economically separating, recovering and purifying expensive iodine from various waste liquors from production processes containing iodine and/or an inorganic iodine compound in high yield. CONSTITUTION:A waste liquor containing iodine and/or an inorganic iodine compound is oxidized or reduced and the produced free iodine molecules are then adsorbed on a strong basic anion exchange resin adsorbing iodide ions under acidic conditions to separate the iodine from inorganic salts or organic substances such as organic solvents, etc., contained in the waste liquor. The resin is then sufficiently washed with tap water, etc., then made to react with the iodine molecules adsorbed on at least one of a sodium bisulfite, a sodium sulfite and a sodium hydroxide solutions, eluted and separated as a solution of hydriodic acid. The oxidized and liberated iodine is subsequently purified by a well-known pressuring melting method to produce the purified iodine product.

Process for microwave radiation synthesizing cellulose base high water absorption resin

Abstract: The microwave radiation process of synthesizing cellulose-base resin with high water absorption includes the following steps: moistening cellulose with deionized water, gelatinizing under microwave radiation, adding potassium persulfate or potassium permanganate and sodium thiosulfate or sodium sulfite oxidation-reduction initiating system and microwave radiating to initiate the reaction for 4-7 min; adding successively the crosslinking agents N,N-methyene-bisacrylamide, epoxy chloropropane or polyglycol bisacrylate, acrylamide or propenyl sodium sulfonate and acrylic acid or methyl acrylic acid, regulating neutralizing degree to 65-75%, reaction under stirring and microwave radiation for 7-10 min, soaking the produced white matterin methanol for 3-5 hr, stoving and crushing. The present invention completes the grafting copolymerization of cellulose in only ten-odd min, and jas high production efficiency and other advantages.