Sodium Gluconate is the sodium salt of gluconic acid with a formula C6H11NaO7 . Sodium gluconate chelates and forms stable complexes with various ions, preventing them from engaging in chemical reactions.
Sodium gluconate is produced by fermentation of glucose. It is a white to tan, granular to fine, crystalline powder, very soluble in water. Non corrosive, non-toxic and readily biodegradable (98 % after 2 days), sodium gluconate is more and more appreciated as chelating agent.
The outstanding property of sodium gluconate is its excellent chelating power, especially in alkaline and concentrated alkaline solutions. It forms stable chelates with calcium, iron, copper, aluminium and other heavy metals, and in this respect, it surpasses all other chelating agents, such as EDTA, NTA and related compounds.
Aqueous solutions of sodium gluconate are resistant to oxidation and reduction, even at high temperatures. However, it is easily degraded biologically (98 % after 2 days), and thus presents no wastewater problem.
And last but not least, it has the property to inhibit bitterness in foodstuffs.
Sodium gluconate is most often made by the aerobic fermentation of a sugar, which can come from corn or beets, to produce gluconic acid. The fermentation product, gluconic acid, is neutralized to create sodium gluconate.
Applications of Sodium gluconate
Used in industry is very broad, can be used as a cleaning agent, admixture, water reducer, retarder, water stabilizer and medicine etc..
As steel surface cleaning agent:
The steel surface such as the need for plating, chrome, nickel, tin pot in order to adapt to the special use, such as the manufacture of tin plate, galvanized plate, chrome plated surface (electricity), the slab surface are required to undergo strict cleaning, make the coating and the steel surface is firmly combined, then add sodium gluconate in the cleaning agent will achieve very good the effect of.
Used as cement admixture:
Add a certain amount of sodium gluconate in cement concrete, can increase the plasticity and strength, and the effect of blocking, i.e. delayed initial and final setting time of concrete
Sodium gluconate as the reducing agent, through access to the effects of added sodium gluconate:
1, improve work performance in water to cement ratio (W/C) under the condition of invariable, adding sodium gluconate can promote the work of. Then, sodium gluconate is the role of plasticizer, 2, increase the intensity when the cement content remain unchanged while the water content of concrete can be reduced (W/C decreased). 3, to reduce the water content and cement content of cement in the same ratio decreased, W/C ratio remained constant.
Sodium gluconate as retarder:
Sodium gluconate can significantly delay the start and end of the concrete setting time. When the dosage is 0.15% below, logarithmic and initial solidification time amount is proportional, namely adding amount doubled, the initial solidification time delay to ten times, which makes the working time from a few hours to a few days without compromising strength
As the water quality stabilizer:
Because the sodium gluconate has excellent inhibition effect, so it is widely used for water quality stabilizer, such as the circulating cooling water system of petrochemical enterprises, low pressure boiler, engine cooling water system treatment agent. Because it has the following advantages: the specific has obvious coordination effect. Suitable for molybdenum, tungsten, silicon, phosphorus, nitrite and other formula, because the coordination effect, corrosion inhibition effect is greatly improved. The corrosion rate increases with increasing temperature. General corrosion inhibitor with the increase of temperature and the corrosion rate decreased, or even compelet loss of function.
But thesodium gluconate on the contrary, the corrosion rate in a certain range increased with the increase of temperature, the scale inhibition ability of calcium, magnesium, iron salts: has a strong complexing ability, so the scale inhibition ability is very strong, especially has excellent chelation on Fe3+, or even have a role in the internal PH wide. The arc pollution. The use of sodium gluconate as circulating cooling water corrosion inhibitor, eradicate pollution, which is currently used by the other advantages of scale and corrosion inhibitor and incomparable.
And used in medicine:
Regulation of acid-base balance in human body, to restore the normal nerve function, can also be based on the same objective, used as a food additive.