chemical name: sodium dithionite
physical and chemical properties: sodium hydrosulfite (sodium dithionite) white crystalline powder, odorless or slightly with sulfur dioxide odor, easily soluble in water, water solution is unstable, insoluble in alcohol. Relative density (water = 1):2.3-2.4, bulk density: 0.9-1.2, auto-ignition temperature: 250 ℃.
insurance powder is a strong reducing agent, which has good stability when stored in a dry closed container. Heating to above 75°C decomposes, exotherms and releases sulfur dioxide. When the temperature reaches 250 ℃, the insurance powder can ignite spontaneously and undergo its own oxidation-reduction reaction. When the dew insurance powder decomposes in humid air, it will be accompanied by heat release; when it is placed in the atmosphere, it will be oxidized by oxygen in the atmosphere. The hydroinsurance powder decomposes rapidly in an aqueous solution with a pH value of less than 5, but it is quite stable in an alkaline medium (the solution is preferably a buffer), but it can also decompose to generate sulfides under strong alkaline conditions.
uses: widely used in the textile industry, used as a reducing agent for vat dye dyeing, reducing bleaching agent, vat dye printing auxiliaries, silk refining and bleaching agent, dye stripping agent and dye vat cleaning agent. It is used as a bleaching agent for mechanical pulp, thermal grinding mechanical pulp and deinked pulp in the paper industry. It is the most suitable bleaching agent for wood pulp papermaking. As a reducing bleaching agent, sodium hydrosulfite is widely used in bleaching of kaolin, bleaching and reducing whitening of fur, bleaching of bamboo products and straw products, etc. Used in mineral processing, thiourea and sulfide synthesis. It is used as a reducing agent in the chemical industry.
food additive sodium dithionite (sodium hydrosulfite) is used as bleach, preservative and antioxidant in the food industry. It is widely used as bleach and food preservative for candied fruits, dried fruits, dried vegetables, vermicelli, glucose, sugar, crystal sugar, caramel, candy, liquid glucose, bamboo shoots, mushrooms and canned mushrooms. The scope of use and the maximum amount of use shall be implemented in accordance with the provisions of the National Food Safety Standard for the Use of Food Additives GB2760.
storage and transportation: the insurance powder should be stored in a cool, ventilated, dry and covered warehouse to avoid direct sunlight. Keep away from fire and heat sources. Do not contact with water or water vapor, do not damp. Do not mix with oxidants, acids or other inflammables. Use the whole barrel as much as possible each time. If it is not used up at one time, take it as you like. If it is not used up, tie the inner bag immediately, seal the barrel cover, store it properly and use it up as soon as possible. The warehouse shall be equipped with dry powder fire extinguisher, fire fighting claw hook and water source as required, and equipped with appropriate amount of gas mask (No.7 yellow canister).
The insurance powder shall be transported by any transportation means with cover or cover. During transportation and handling, it shall be loaded and unloaded lightly to prevent damage to the packaging container. If damaged packaging is found, it shall be replaced immediately or properly handled. During transportation, the packaging barrel shall not be inverted or collided, so as to maintain the sealing of the packaging, prevent moisture and rain, avoid direct sunlight, and shall not be mixed with acids, oxidants, etc.
packing: sodium hydrosulfite (sodium dithionite) and food additive sodium dithionite (sodium hydrosulfite) are packed in tightly sealed iron drums lined with double-layer plastic bags (plastic bags should be double-tied). The net weight of each barrel is 15±0.15kg, 25 kg ± 0.2kg,50kg ± 0.3kg, 100±0.4kg.
product quality: insurance powder (sodium dithionite) products to implement the "insurance powder (sodium dithionite)" HG/T2074 chemical industry standards. Food additive sodium dithionite (insurance powder) products to implement the "food additive sodium dithionite (insurance powder)" GB/22215 national standard.