The bleaching agent is some chemical items that can react the color molecules into colorless molecules through the oxidation reaction to remove the color or fade to the function of the bleach.The bleaching agent can distinguish the role of the oxidation reaction in the bleaching process: if the bleach is the oxidant in the reaction, it is an oxidative bleach;Prototype bleach.The more commonly used in daily life is oxide bleach, including chlorine bleach and oxygen bleach.
The application of bleaching agents
Application in food
In addition to improving the color of food, bleaching agents also have a variety of effects such as bacteriostatic, and are widely used in food processing.In addition to a few varieties such as peroxybenzohide and chlorine dioxide as a flour treatment agent, there are very few actual applications.As for the hydrogen peroxide, my country is only allowed to use cotton milk in some areas to keep milk and keep the tofu in some areas.
By bleaching agents consume oxygen in food by restoring chemical effects, destroying and inhibiting food oxidase activity and hair coloring factors of food, making the brown transformation of food fading or avoiding brown changes, and also has a certain anti -corrosion effect.
The bleaching agents allowed in my country include sulfur dioxide, sodium sulfate, sulfur, and chlorine dioxide. Among them, sulfur is limited to the fumigation of honey, dried fruits, dried vegetables, fans, and sugar, and has a clear limit of usage.
The bleaching agent is a matter of destruction and inhibiting the hair color of the food, so that it is degenerate or the food is removed from brown.
Chlorine dioxide is widely used in drinking water, industrial circulating water and swimming pool water. It has the characteristics of non -pollution environment, no reaction with ammonia, small amount, and good sterilization effect.It is particularly suitable for circulating water, organic alkaline water treatment and phenol -containing wastewater treatment of chemical fertilizers.In addition, chlorine dioxide is also used in the leather industrys raw leather hair removal and oil -containing sewage purification.Therefore, chlorine dioxide has been widely used in food processing industrial water, drug industrial water, and industrial circulating water for food processing industrial water, drug industrial water, and industrial circulating water, vegetables, fruits, shrimp and other items before the food processing of tap, Special sterilization and disinfection of poultry house breeding farms, silkworm room fishing pond mushroom houses, sterilization disinfection of hospital wards, high -end hotels, food workshops, pharmaceutical workshops, bathroom barber shops and food shops, refrigerators, microphones, refrigerated rooms, etc.Flour, pulp, wool, sugar, oil, etc. are bleached, skin disease drugs, toothpaste, leather industry production, purification of phenol, oil -containing sewage, paper and black fluid.
What should be paid attention to when using the bleach
1. The optimal reaction temperature of this reaction is 20-25 ° C, and the temperature is low-sensitivity, so the standard series tube and sample are color at the same temperature;
2. If the reaction temperature is 15-16 ° C, the static time needs to be extended to 20 minutes;
3. The amount of hydrochloric acid in the hydrochloride hydrochloride has an impact on color rendering. The amount of hydrochloric acid is added with a large amount of hydrochloric acid and shallow color;
4. When the formaldehyde concentration is 0.15-0.25%, the color is stable, so you should choose 0.2%formaldehyde solution;
5. Measure a sample with darker samples, 10%activated carbon out of color;
6. Add NA2HGCL4 absorption solution to the 100ml capacity bottle and add water to the scale, shake well, this solution is stable within 24 hours, otherwise it can be used for one week at 4 ° C;
7. This method measured that HGCL2 is very toxic, so you should pay attention to safety during experiments.There are scientific and technological reports using EDTA (ethylemine tethalotic acid) reagent instead of sodium tetrachlom chloride, but this experiment has not been confirmed.

Related tags： Houseware