Regarding oxygen scavengers, what are the commonly used agents for chemical oxygen removal?

Generally speaking, freshpac is also known as oxygen absorber or desiccant, and the common desiccant is as follows: Fe (iron, pure iron is silvery-white, common pig iron, black; Solid, mostly lumpy, powdered when desiccant), CAO (calcium oxide is also called quicklime, white, solid, mostly powdery), NaOH (sodium hydroxide is also called caustic soda, caustic soda, caustic soda, white, solid, mostly powder) and so on. The desiccant in food is generally Fe or CAO.

Therefore, the above-mentioned black powdered solid should be Fe, and the principle is: Fe reacts with water vapor and oxygen to form iron hydrate (generally can be written: 4Fe + 3O2 = 2Fe2O3).

Freshpac, also known as oxygen absorber, can be used in food, pharmaceuticals or other products to prevent rotting, deterioration, mildew and deodorization: this oxygen scavenger can maintain the nutritional value of the product itself and avoid the loss of its quality. It allows the oxygen content inside the package to be less than and continues to be maintained at that level.

Notable features of this series of products:

It prevents the growth of aerobic pathogens and their destruction of tissues.

Some conditions are needed to rule out some of the conditions where bacteria may grow rapidly.

Extend the shelf life of the product.

Typical uses: pharmaceuticals, vitamins.

Food (bread, cakes, pastries, etc.).

Snack foods.

Freshpac, also known as oxygen absorber or desiccant, can be used in food, pharmaceuticals or other products to prevent rotting, deterioration, mildew and deodorization: this oxygen scavenger can maintain the nutritional value of the product itself and avoid the loss of its quality. It allows the oxygen content inside the package to be less than and continues to be maintained at that level.

The method of adding the old chemical agent to the water and initiating a chemical reaction with the oxygen in the water, and removing the oxygen is called chemical oxygen removal.

Commonly used chemical oxygen scavengers are: sodium sulfite, hydrazine, dimethyl ketone oxime, acetone oxime, ascorbic acid wild blood acid, sodium ascorbate, sodium dithiotetraoxynate (or calcium) and ferrous hydroxide.

The necessary conditions for thermal deoxygenation are:

The feed water must be heated to a saturation temperature corresponding to the deaerator pressure.

The separated escaping gases from the water must be drained in a timely manner.

The first condition is not met, the gas cannot be completely separated from the water; When the second condition is not met, the separated gas will be returned to the water.

It should also be pointed out that the process of separating and escaping the gas from the water is not completed instantaneously, and it takes a certain duration for the gas to be separated.

Search: What are the two necessary conditions for deaerator heating and deoxygenation?

1) The water must be heated to a saturation temperature corresponding to the pressure of the deaerator at that time;

2) Make the segregation process of the gas sufficient;

3) Ensure that water and steam have sufficient contact time;

4) It can smoothly discharge the dissolved gases (O8, NZ, CO2, etc.) that have been segregated.

Oxygen scavengers can be used in food, pharmaceuticals or other products to prevent rotting, deterioration, mildew and deodorization: the nutritional value of the product itself can be maintained and the loss of quality can be avoided through this oxygen scavenger. It allows the oxygen content inside the package to be less than and continues to be maintained at that level.

The chemical agent is added to the water to cause a chemical reaction with the oxygen in the water, and the method of removing the oxygen is called chemical oxygen removal.

Because it is a chemical agent added to the feed water, the salt content of the feed water is increased, and it is rarely used to treat the feed water alone, and is only used as an auxiliary deaeration measure after the feed water is heated and deoxygenated, and the remaining and small amount of dissolved oxygen in the water is removed. Commonly used chemical oxygen scavengers are: sodium sulfite, hydrazine, dimethyl ketone oxime, acetone oxime, ascorbic acid, sodium ascorbate, sodium dithiotetraoxynate (or calcium) and ferrous hydroxide.

Oxygen scavengers can be used in food, pharmaceuticals or other products to prevent rotting, deterioration, mildew and deodorization: through this kind of oxygen removal agent, the nutritional value of the product itself can be maintained and the loss of its quality can be avoided. It allows the oxygen content inside the package to be less than that of spring mill and continues to maintain that level.

Oxygen absorber, also known as oxygen absorber, oxygen scavenger, oxygen absorber, mainly by removing the oxygen that causes changes in food quality, fundamentally prevent food oxidation substances, it is simpler than vacuum packaging, inert gas packaging, easy to use, low cost, and oxygen absorber preservation food can maintain the original flavor and color of food without sterilization, especially effective for low-salt and low-sugar preservation food. The desiccant is also called an absorbent, which is used in moisture-proof and mildew-proof, playing a drying role, mainly to prevent deterioration caused by moisture, it can not play a role in deoxidation, and the deterioration of moon cakes is mainly due to the presence of oxygen that causes aerobic microorganisms to grow and cause mildew, etc., so it is a deoxidizer rather than a desiccant in the moon cakes. Hope it helps!