TIANFU-CHEM - Sodium tripolyphosphate
Sodium tripolyphosphate
CAS: 13573-18-7
Molecular Formula: H5O10P3.xNa
TIANFU-CHEM - Sodium tripolyphosphate - Names and Identifiers
| Name | Sodium tripolyphosphate |
| Synonyms | SoTripolyphosphate Sodium tripolyphosphate TIANFU-CHEM - Sodium tripolyphosphate |
| CAS | 13573-18-7 |
| EINECS | 237-004-9 |
TIANFU-CHEM - Sodium tripolyphosphate - Physico-chemical Properties
| Molecular Formula | H5O10P3.xNa |
| Molar Mass | 367.862 |
| Physical and Chemical Properties | White powder. Soluble in water, its aqueous solution is alkaline. |
| Use | Uses for meat processing, synthetic detergent formulations, textile dyeing, also used as a dispersant, co-solvent, etc. |
TIANFU-CHEM - Sodium tripolyphosphate - Effect of sodium tripolyphosphate on crystal growth habit and crystal morphology of gypsum dihydrate
from Wanfang
Author:
Peng Jiahui , Zhang Jianxin , Chen Mingfeng , , Wu Li
Abstract:
sodium tripolyphosphate is an efficient retarder for building gypsum. The effects of sodium tripolyphosphate on the setting and hardening of building gypsum, ion concentration and supersaturation of liquid phase, crystal growth habit and morphology of dihydrate gypsum were studied by scanning electron microscopy and X-ray photoelectron spectroscopy. The action mechanism of sodium tripolyphosphate on gypsum dihydrate was analyzed from the angle of crystal growth. The results showed that sodium tripolyphosphate significantly changed the growth habit of gypsum Dihydrate Crystals from needle to short column or plate, and the crystal size increased; sodium tripolyphosphate is selectively adsorbed on the (111) plane of gypsum dihydrate Crystal through chemical action, which inhibits its growth in the c-axis direction and changes the relative growth rate of the crystal plane in different axial directions, the crystal growth habit and morphology of gypsum dihydrate are changed. Sodium tripolyphosphate reduces the ion concentration and supersaturation of gypsum liquid phase, reduces the nucleation probability and nucleation rate of gypsum crystal, and leads to the coarsening of gypsum crystal.
Key words:
gypsum; Retarder; Sodium tripolyphosphate; Crystal growth habit; crystal morphology
DOI:
10.3321/j.issn:0454-5648.2006.06.018
cited:
year:
2006
Last Update：2024-01-02 23:10:35
TIANFU-CHEM - Sodium tripolyphosphate - Study on chitosan-sodium tripolyphosphate polyion composite membrane
from VIP
Author:
Meng pingrui Li Liangbo , Chen cuixian , Li Jiding
Abstract:
The structure of chitosan-sodium tripolyphosphate polyion composite membrane was characterized by infrared spectroscopy. The effects of membrane composition, feed concentration and temperature on the pervaporation separation performance of ethanol-water solution were studied. The experimental results show that the composite membrane has high separation performance and permeation flux for ethanol-water solution. The mechanism of Pervaporation and its influencing factors were also discussed.
Key words:
chitosan/Sodium polyphosphate Polyionic membrane pervaporation membrane structure membrane separation ethanol/water solution
DOI:
10.3321/j.issn:1000-7555.2004.02.050
cited:
year:
2004
Last Update：2023-08-16 22:05:47
TIANFU-CHEM - Sodium tripolyphosphate - Production of sodium tripolyphosphate
Last Update：2023-08-16 22:05:47
TIANFU-CHEM - Sodium tripolyphosphate - Control and recovery of wastewater containing phosphorus in the production of sodium tripolyphosphate
Last Update：2023-08-16 22:05:47
TIANFU-CHEM - Sodium tripolyphosphate - Reference Information
| use | sodium tripolyphosphate is also known as sodium triphosphate and pentasodium phosphate. White crystal. Molecular weight 367.86. Soluble in water. There are two common types of anhydrous and hexahydrate. Anhydrous is stable and hydrate is hygroscopic. The solubility of hexahydrate in water is less than that of anhydrous. It has good ability to complex metal ions and can complex with calcium, magnesium and iron metals to form soluble complexes. It has suspension dispersion, peptization and emulsification effects on grease. Mainly used as an additive in synthetic detergents. Also used as water softener, pre-tanning agent, dyeing aid, etc. Using wet-process phosphoric acid as raw material, it is neutralized with sodium hydroxide and prepared by spray drying. Sodium tripolyphosphate is used as a softener, dispersant and dyeing aid. Used as a softener for industrial water to reduce the content of calcium, magnesium, iron and other metal ions in industrial water, and reduce the hardness of water; used as a dispersant in industrial configurations such as paint, kaolin, magnesium oxide, and calcium carbonate, and used for drilling mud dispersant. In addition, it can also be used as a detergent additive, food additive, gypsum and other mold water reducing agent. Used for meat processing, synthetic detergent formulation, textile dyeing, and also used as dispersant, cosolvent, etc. |
| production method | (1) thermal phosphoric acid two-step method puts phosphoric acid (55% ~ 60%) solution into a stainless steel neutralization tank after metering, heats up and starts the mixer, slowly adds soda ash under stirring to carry out neutralization reaction, and maintains the ratio of 2-molecule disodium hydrogen phosphate to 1-molecule sodium dihydrogen phosphate in the neutralization tank. The neutralized mixed liquid enters the spray drying tower through the high-level tank for drying, and the dried orthophosphate dry material is discharged from the bottom of the tower to the rotary polymerization furnace, and a small part of the dry material taken away by the furnace gas is recovered by the cyclone dust collector. The orthophosphate dry material is polymerized in a polymerization furnace at a temperature of 350~450 ℃ to generate sodium tripolyphosphate. After cooling and crushing, a finished product of sodium tripolyphosphate is prepared. The reaction formula is as follows. (2) Wet-process phosphoric acid One-step method reacts phosphate rock powder with sulfuric acid to prepare extracted phosphoric acid. The fluorosilicic acid is removed in the defluorination tank with soda ash, and then the sulfate radical is removed with barium carbonate in the desulfurization tank to reduce the sodium sulfate content in the phosphoric acid. Then neutralization is carried out with soda ash. After filtration, a large amount of iron, aluminum and other impurities are removed. After fine adjustment and filtration, the obtained solution containing a certain proportion of disodium hydrogen phosphate and sodium dihydrogen phosphate is concentrated in the evaporator to meet the requirements of spray polymerization. The slurry is sprayed into the rotary polymerization furnace, dried and polymerized by hot air powder spraying. After cooling, crushing, and sieving, the finished product of sodium tripolyphosphate is prepared. The reaction formula is as follows. |
Last Update：2024-04-09 20:02:46
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