Sodium gluconate is a type of polyhydroxycarboxylic acid sodium with a wide range of uses. It has been developed and applied as follows:

1. Used as a water quality stabilizer:

Due to its excellent corrosion and scale inhibition properties, sodium gluconate is widely used as a water quality stabilizer, such as as as a treatment agent for circulating cooling water systems in petrochemical enterprises, low-pressure boilers, and internal combustion engine cooling water systems.

Because it has the following specific advantages:

(1) It has a significant coordination effect. Suitable for formulas such as molybdenum, silicon, phosphorus, tungsten, nitrite, etc. Due to the coordination effect, the corrosion inhibition effect is greatly improved.

The corrosion inhibition rate increases with the increase of temperature. The corrosion inhibition rate of general corrosion inhibitors decreases with the increase of temperature, and even completely loses its effect. But sodium gluconate is the opposite, and the corrosion inhibition rate increases with temperature within a certain range. For example, in experiments on materials such as carbon steel, when the temperature rises from 77 ° C F to 120 ° C F, the average buffering rate increases by more than 5%. So the peculiar property of sodium gluconate is ideal for use as a corrosion inhibitor in systems with higher temperatures or in systems with variable temperatures from low to high.

⑶ Strong scale inhibition ability: It has strong chelating ability to calcium, magnesium, and iron salts, so it has strong scale inhibition ability, especially excellent chelating effect on Fe3+, and even has an effect within the entire pH range.

(4) Eliminate public hazards. The use of sodium gluconate as a corrosion and scale inhibitor for circulating cooling water achieves the goal of eliminating environmental hazards, which is an advantage that other corrosion and scale inhibitors currently used cannot match.

2. Used as a surface cleaning agent for steel:

When the surface of steel needs to be plated with a bowl, chromium, tin, or nickel to adapt to special purposes, such as manufacturing tinplate, galvanized sheet, or surface chrome plating (electrical degree), the surface of the steel billet needs to be strictly cleaned to ensure that the coating is firmly bonded to the surface of the steel. At this time, adding sodium gluconate to the cleaning agent will achieve a very ideal effect. This has been confirmed by large companies that manufacture tinplate internationally.

3. Used as a special cleaning agent for glass bottles:

The cleaning of billions of glass bottles in the beverage, food, and brewing industries, such as soda bottles, beer bottles, milk bottles, can bottles, soy sauce bottles, wine bottles, etc., is a very important task, and the formulation of cleaning agents is a difficult technical task. At present, there is no ideal drug in China. The main problems include: weak descaling ability, easy blockage of the nozzle and pipeline of the bottle washing machine; The ability to remove rust from bottle stickers and bottlenecks is not ideal; The trace residue after washing is not ideal for food safety (such as phosphate residue); Washing water discharge becomes a public hazard (cannot meet national standards). If sodium gluconate is used as the main ingredient in the formulation of its glass bottle cleaning agent, the above problems can be easily solved. In the 1980s, large-scale experiments were conducted at Shanghai Soda Factory and Shanghai Brewery, with identification certificates. The application in this area has not yet been developed domestically, and if it forms a market, there is great potential.

4. As a cement admixture

After adding a certain amount of sodium gluconate to cement, the plasticity and strength of concrete can be increased, and it has a blocking effect, which delays the initial and final setting period of concrete. For example, adding 0.15% sodium gluconate can extend the initial setting time of concrete by more than 10 times, which means extending the plasticity time of concrete from a few hours to a few days without affecting its fastness. Plasticity and delaying the initial setting time are very important issues in concrete operations, such as in construction during high temperature seasons and large-scale engineering operations, delaying the initial setting time is a difficult problem. Sodium gluconate can successfully solve this problem. In addition, it is quite difficult to bond oil wells at high temperatures. The concrete added with sodium gluconate can be plastic within a few hours at a high temperature of 170 ℃, thus successfully solving the above problems. Therefore, sodium gluconate as a cement admixture has been widely used in important construction projects abroad, such as in a large number of bridge projects in the Middle East. However, our domestic application in this area has not yet been promoted and applied. It is said that sodium cellulose sulfonate has been extracted from papermaking wastewater, and its effect is incomparable to that of sodium gluconate. In addition, it can also be applied in electroplating and film manufacturing industries. As a polyhydroxycarboxylic acid type excellent corrosion and scale inhibitor, sodium gluconate, due to its many specific properties mentioned above, if efforts can be made in application technology, it will undoubtedly be developed into a large industry.