Sodium Tripolyphosphate CAS 7758-29-4
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- Appearance: White powder
- Assay: 99. 0%min
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Sodium Tripolyphosphate: The Complete Guide
Sodium Tripolyphosphate for Sale
Basic Info of Sodium Tripolyphosphate
Tripolyphosphate de sodium; Sodium tripolifosfat; stpp sodium tripolyphosphate; natrium tripolyphosphate; tripolyphosphate of sodium
Pharmaceutical, pesticide, dye intermediates; Pharmaceutical raw materials; Organic raw materials; Inorganic salts; Food additives
What is Sodium Tripolyphosphate?
Sodium tripolyphosphate, also known as pentasodium tripolyphosphate, pentasodium tripolyphosphate or sodium tripolyphosphate, is widely used in the manufacture of cleaning products, food preservatives and water treatment facilities.
Sodium tripolyphosphate can be separated into high temperature kind (I type) and low temperature kind (II kind) as a result of different development temperatures. The difference is that the bond length and bond angle of both are different. The hydrate Na5P3O10 6H2O, under the exact same conditions, the type I hydration quickly produces high heat, as well as is prone to pile when liquified in water. This results from the presence of four ligands in the kind I framework. The ligand has a strong fondness for water, whereas type II forms hexahydrate at a very sluggish rate in water.
Sodium tripolyphosphate is quite secure at area temperature, and will gradually hydrolyze in moist air, at some point producing salt orthophosphate.
Chelating capacity to steel ions
Sodium tripolyphosphate has complexation with Ca2+, Mg2+, Fe3+ as well as other metal ions dissolved in water to form soluble complexes.
The sodium tripolyphosphate liquid solution is weakly alkaline (the pH value of 1% liquid service has to do with 9.7), and it develops a suspension (comparable to a solution) in the pH series of 4.3 to 14, that is, dispersion. Salt tripolyphosphate can additionally make liquid and also solid particles much better liquified in liquid (such as water) medium, to ensure that the appearance of the remedy is entirely clear, like a real option, which is the solubilization effect. Due to the above unique residential or commercial properties of salt tripolyphosphate, it has become an essential optimal basic material in cleaning powder.
Sodium Tripolyphosphate Uses
- Food additive
Sodium tripolyphosphate can also make meat and seafood appear fresh and slow down corruption. This chemical helps maintain the natural color of meat and fish and improves their texture. This is achieved by improving the water retention capacity of animal products and thus slowing their drying.
- Strong cleaner
Sodium tripolyphosphate is used in various cleaning products. It improves the deeper penetration ability of various components in the detergent to the clothing fibers (and other surfaces and materials that need to be cleaned), and helps to foaming and foaming. Therefore, most chemical plants producing sodium tripolyphosphate list “detergent” as the main use area of this chemical.
- Water treatment agent
Water treatment is achieved by the pH buffering capacity of sodium tripolyphosphate, which means that it can “soften” the acidic water by neutralizing the acidic water. This quality is one of the reasons why it is added to the detergent. It is used as cooling water treatment and water softener in power plants, rolling stock, boilers and fertilizer plants. It has strong complexation ability for Ca2 + complex, 19.5g calcium per 100g. The normal growth process of calcium phosphate crystal is destroyed due to SHMP chelation, adsorption and dispersion, and the formation of calcium phosphate scale is prevented. The dosage is 0.5mg/l, and the scale prevention rate is as high as 95% ~ 100%.
- Leather tanning agent
Sodium tripolyphosphate is listed as a tanning agent for leather. Interestingly, the chemical has also been used as an anti oil stain agent in the papermaking process. Therefore, it can not only help manufacturers to apply the correct color to the media, but also avoid unnecessary colors.
- Other uses
Other uses of sodium tripolyphosphate include petroleum refining, metallurgy and mining applications Sodium tripolyphosphate is a kind of binder, stabilizer and multivalent chelating agent. It is weakly alkaline with pH value of 10. It is moderately soluble in water and has a solubility of 15g in 100ml water at 25 ° C. It is used to improve the beating performance of angel cake powder and egg white pastry containing eggs. It can reduce the gelation of juice and canned ham, and soften canned peas and lima beans. It is a moisture binder in cured pork, which can prevent the sausage product from discoloration and reduce shrinkage. In seaweed desserts, it acts as a calcium chelator. Sodium tripolyphosphate is also known as pentasodium tripolyphosphate and sodium tripolyphosphate.
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Application of Sodium Tripolyphosphate
- The role of heavy metal ion chelate: in the process of washing water, heavy metal ions can combine with cleaning agent molecules to develop insoluble metal salts, reduce the cleaning capacity, and even shed their function entirely. As a result, it is necessary to add a chelating agent to make the water containing heavy metal ions a safe material in the cleaning agent. Salt tripolyphosphate has a solid chelating impact on heavy metal ions, blocking them and also eliminating the adverse result on cleaning. In addition, it can record the dirt consisted of in numerous steels throughout the cleaning procedure, play the duty of dissociating the dust, and use it as a soap synergist to stop the rainfall and blooming of bar soap oil.
- Dirt, emulsification as well as dispersion of eating gum tissue: Dirt usually consists of body fluids (mainly proteins as well as fatty substances), in addition to external sand and dirt. Salt tripolyphosphate has the result of swelling, solubilization and also adhesive on dirt proteins; promotes the emulsification of fat; distributes solid dirt, has a solid emulsification effect on lubricating oil and fat, and also can be made use of to readjust barrier soap pH worth.
- Protect against cleaning agent heap: Artificial washing cleaning agent is hygroscopic, as well as if it is kept in a location with high humidity, there will be load. Using cleaning agent agglomerates is inconvenient. Sodium tripolyphosphate types hexahydrate after taking in water, which has the features of drying. Stops caking caused by moisture absorption and also keeps the dry granular type of synthetic detergents when used in large quantities in cleaning agent solutions.
- Sodium tripolyphosphate has actually a big buffered alkaline washing option, as well as the pH value is preserved at about 9.4, which contributes to the elimination of acidic dust.
Preparation of Sodium Tripolyphosphate
The method that utilizes crude sodium pyrophosphate to produce sodium tripolyphosphate
The crude sodium pyrophosphate first enters the salt washing tank to remove most of the sodium chloride through salt washing, and then enters the plate and frame filter press for one-time pressure filtration. The filter cake contains a large amount of sodium pyrophosphate, and the mass concentration of sodium chloride is less than 2.5%. Then, the solution was heated to 85°C with steam in the dissolving tank for stirring and dissolving. When dissolving, sodium sulfide was added to remove metal ions, and the insolubles were impurities such as copper hydroxide, and the second pressure filtration was carried out. The filtrate was sodium pyrophosphate solution. Activated carbon is added to the filtrate to remove pigment, phosphoric acid is added for acidification, and the dissolution is accelerated, and finally, liquid alkali is added to adjust the pH value to 7.5-8.5 to prepare a refined solution.
A part of the refined liquid is directly used in the sodium tripolyphosphate neutralization liquid preparation section, and the other part of the refined liquid is pumped into the DTB crystallizer. Heat exchange and cooling in the heater; when the temperature of the solution drops to 15 °C, the crystallization becomes flocculent, and then it is transported to the high-level tank and enters the centrifuge for centrifugation to obtain sodium pyrophosphate crystals. The sodium pyrophosphate crystals are added to the production process of sodium tripolyphosphate. In the neutralization liquid preparation section, the neutralization liquid is mixed with phosphoric acid and liquid caustic soda to prepare the neutralization liquid as the production raw material for the production of sodium tripolyphosphate. The above-mentioned washing brine is returned for washing crude sodium pyrophosphate; when the sodium chloride content in the washing brine reaches saturation, the washing brine is pumped into the buffer pool, and the washing brine in the buffer pool enters the sodium tripolyphosphate tail gas duct jacket through the pump Heat exchange with high-temperature exhaust gas, and the washed brine after heat exchange returns to the buffer pool for spray evaporation.
- Method for producing sodium tripolyphosphate by one-step polycondensation of yellow phosphorus burning and caustic soda solution
The metered yellow phosphorus with a mass fraction of more than 99.9% is continuously sprayed into the polymerization furnace with 600kPa compressed air, and the metered 20% caustic soda solution is continuously pumped into the polymerization furnace with a pressure pump. The mass ratio of the 20% caustic soda solution is controlled at 5:54, and the yellow phosphorus is sprayed and atomized from the phosphorus gun in the furnace to immediately burn to generate phosphorus pentoxide. 30min to become sodium tripolyphosphate, and then through conventional cooling and pulverization process to make sodium tripolyphosphate product.