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ChemicalBook Optimization Suppliers |
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| | ヘキサメタりん酸ナトリウム Usage And Synthesis |
| 外観 | 白色, 結晶性粉末～粉末 | | 定義 | 本品は、次の化学式で表されるナトリウム塩である。 | | 溶解性 | 水に可溶。水に溶ける。 | | 用途 | イオン封鎖剤、染色助剤、分散剤、粘度調整剤、過酸化水素安定剤。 | | 化粧品の成分用途 | キレート剤、腐蝕防止剤、香料 | | 化学的特性 | white granular solid | | 化学的特性 | The sodium polyphosphates class consists of several amorphous, water soluble polyphosphates composed of linear chains of metaphosphate units, (NaPO3)x where x ≥ 2, terminated by Na2PO4- groups. They are usually identified by their Na2O/ P2O5 ratio or their P2O5 content. The Na2O/P2O5 ratios vary from about 1.3 for sodium tetrapolyphosphate, where x = approximately 4; through about 1.1 for Graham’s salt, commonly called sodium hexametaphosphate, where x = 13 to 18; to about 1.0 for the higher molecular weight sodium polyphosphates, where x = 20 to 100 or more. The pH of their solution varies from about 3 to 9. For additional details of description, refer to Burdock (1997). | | 使用 | sodium hexametaphosphate is a chelating agent and a corrosion inhibitor. This is an inorganic salt. | | 使用 | For industrial use, such as oil field, paper-making, textile, dyeing, petrochemical industry,tanning industry, metallurgical industry and building material industry, It is mainly used as a water sortening agent in solution for printing, dyeing ,and boiler; Diffusant in papermersing medium, high temperature agglomerant,detergent and soil analytical chemistry reagent, | | 使用 | Sodium Hexametaphosphate is a sequestrant and moisture binder
that is very soluble in water but dissolves slowly. solutions have a
ph of 7.0. it permits peanuts to be salted in the shell by making it
possible for the salt brine to penetrate the peanuts. in canned peas
and lima beans, it functions as a tenderizer when added to the water
used to soak or scald the vegetables prior to canning. it improves
whipping properties in whipping proteins. it functions as a seques-
trant for calcium and magnesium, having the best sequestering
power of all the phosphates. it prevents gel formation in sterilized
milk. it is also termed sodium metaphosphate and graham’s salt. | | 製造方法 | Sodium hexametaphosphate is prepared by heating monosodium phosphate (NaH2PO4) rapidly to a clear melt, which occurs slightly above 625°C. Rapid chilling of this melt produces a very soluble glass, which is then crushed or milled. | | 农业用途 | Sodium metaphosphate is the salt of metaphosphoric acid
having a molecular formula (NaPO3)n, where n ranges
from 3 to 10 (for cyclic molecules) or may be much larger
(for polymers).
Cyclic molecules have alternate phosphorus and
oxygen atoms in the rings and start with trimetaphosphate
(NaPO3)3 to at least decametaphosphate.
Sodium hexametaphosphate may be a polymer where n is
between 10 and 20.
Vitreous sodium phosphates have a Na2O:P2O5 ratio
near unity and are called Graham's salts. The average
number of phosphorus atoms in these vitreous glasses
ranges from 25 to infinity. | | 工業用途 | Sodium hexametaphosphate (SHMP) or water glass Na6P6O18 is basically the salt of metaphosphoric acid. SHMP is difficult to dissolve. By mixing SHMP for 1-3 h, a solution of 8-10% can be obtained. The pH of this solution is about 5. Because of a weak acid reaction, the SHMP reacts with cations of bivalent metals forming Na2MeP6O18 or Na4MeP6O18. In the presence of oxygen, SHMP slowly decomposes into pyrophosphate and orthophosphate. | | 安全性プロファイル | Poison by intravenous route. Moderately toxic by intraperitoneal and subcutaneous routes. Wdly toxic by ingestion. When heated to decomposition it emits toxic fumes of PO, and Na2O. See also PHOSPHATES. | | Properties and Applications |
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TEST ITEMS
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SPECIFICATION
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APPEARANCE
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WHITE POWDER
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TOTAL PHOSPHATE(P
2
O
5
)
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68.0% min
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INACTIVE PHOSPHATE (P
2
O
5
)
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7.5% max
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WATER-INSOLUBLE MATTER
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0.05% max
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Fe CONTENT
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0.05% max
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pH VALUE 1% AQUEOUS SOLUTION
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5.8-7.3
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As
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-
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Pb
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-
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F
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-
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