亚洲AV成人深夜一区午夜网站_自拍偷拍亚洲第几页_蜜臂无码AV在线_国产粉嫩馒头一线天免费_日韩 欧美所69内射久久_亚洲精品影片日韩美_国产成人一区二区免费不…回_欧美中文日韩综合在线视频_搞机time免费的恶心软件下_最近中文字幕高清mv

Features: Translucent white orthorhombic crystals or small pieces
Molecular formula: NaHSO2·CH2O·2H2O
Properties: Also known as sodium sulfoxylate formaldehyde (rongalite). The apparent density is 1.80～1.85g/cm3. The melting point of 64 ° C (dissolved in its crystal water). Decomposes above 120°C. Soluble in water, slightly soluble in alcohol. Anhydrous salts are more stable. But it will gradually decompose in moist air. It has strong reducibility at high temperature. The slurry is prepared from zinc powder and water, and sulfur dioxide is introduced into the slurry for reaction to generate zinc dithionite, which is then added with formaldehyde, and the zinc powder is reduced and then reacted with sodium hydroxide. It is used as a dye discharge agent and reducing agent for printing and dyeing, and can be used in synthetic rubber, sugar production, and indigo dye and vat dye production.