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| 融点 | -20°C | | 沸点 | 550 °C | | 比重(密度) | 2.06 g/mL at 25 °C | | 蒸気圧 | 2 hPa (20 °C) | | 貯蔵温度 | Store below +30°C. | | 溶解性 | Methanol (Soluble), Water (Soluble) | | 酸解離定数(Pka) | 0.91[at 20 ℃] | | 外見 | Viscous Liquid | | 色 | Colorless | | 比重 | 2.06 | | 水溶解度 | MAY DECOMPOSE | | Sensitive | Hygroscopic | | Merck | 14,7580 | | 安定性： | Stable. Incompatible with strong bases. Hygroscopic. | | CAS データベース | 8017-16-1(CAS DataBase Reference) | | EPAの化学物質情報 | Polyphosphoric acids (8017-16-1) |
| | ポリりん酸 Usage And Synthesis |
| 外観 | 無色～わずかにうすい黄色, 液体 | | 溶解性 | 水に加水分解を伴い溶解し, りん酸を生じる。 | | 用途 | アルキル反応用触媒、メッキ | | 用途 | 有機合成(和光試薬時報Vol.63 No.1,p.26(1995))。 | | 使用上の注意 | 極めて吸湿性が強いので、使用後は直ちに密封して下さい。冬期 温度が低温になると凝固現象を起こすことがあります。使用前に温湯に浸漬してから、ご使用下さい。 | | 説明 | Superphosphoric acid is made by
the concentration of regular wet-process acid up to P2O5
concentrations of 78%. Granular polyphosphates suitable
for bulk blending are made by reacting ammonia with
regular wet process acid of 52% P2O5 content and using the
heat of reaction to drive off water to produce a phosphate
melt of 10-43-0, with about 40% of the phosphorus in the
polyphosphate form. These materials are, however, not
suitable for bulk blending due to their “sticky” nature (10). | | 化学的特性 | Viscous, water-white liquid. Water solu-
ble. Does not crystallize on standing; hygroscopic.
The commercial acid is a mixture of orthophos-
phoric acid with pyrophosphoric, triphosphoric, and
higher acids and is sold on the basis of its calcu-
lated content of H3PO4, e.g., 115%. Superphospho-
ric acid is a similar mixture sold at 105% H3PO4.
These acids revert slowly to orthophosphoric acid
on dilution with water. | | 使用 | Polyphosphoric acid can be used as an analytical reagent in chemical industry and a powerful dehydrating agent for organic synthesis.
It is used in production of acid phosphates and pharmaceuticals.
Intermediate for production of phosphate esters with high mono-ester content.
Polyphosphoric acid can be used as a catalyst during synthesis of dimethyl carbonate from urea and methanol.
It is widely employed as acylation and alkylation reagent in various reactions. It can be used as a catalyst in the synthesis of various aromatic ketones.
It may be used to prepare silica-supported polyphosphoric acid, an easy to handle, reusable heterogeneous catalyst.
Polyphosphoric acid may be used in the synthesis of aromatic sulfones, N-substituted amides and 4-aminobenzophenones.
Used as a catalyst and absorbent of ammonia during the synthesis of dimethyl carbonate (DMC).
Used as a solvent in the synthesis of hyperbranched polybenzoxazoles. | | 使用 | Dehydrating, catalytic, and sequestering agents,
for metal treating; many applications where a con-
centrated monooxidizing acid is needed; laboratory
reagent. | | 使用 | Polyphosphoric Acid is a ligand used as an analytical tool to image nanoparticles through photon emission topography. Used also in the synthesis of pharmaceuticals. | | 定義 | ChEBI: A polymerized phosphorus oxoacid of general formula HO[PO2OH]nH formed by condensation of orthophosphoric acid molecules and containing a backbone chain consisting of alternating P and O atoms covalent
y bonded together. | | 一般的な説明 | Polyphosphoric acid (PPA) is widely employed as acylation and alkylation reagent in various reactions. It is a strong mineral acid with excellent dehydrating properties. | | 危険性 | Toxic by ingestion; strong irritant. | | 农业用途 | Polyphosphoric acid is obtained by heating the wetprocess
phosphoric acid. It contains around 72%
phosphorus (as P2O5) and represents a series of
phosphoric acids containing more than one atom of
phosphorus (such as H4P2O7). The general formula is
Hn+2PnO3n+1. | | Solubility in water | Polyphosphoric acids are miscible with water, hydrolyzing to orthophosphoric acid with the generation of heat. They are insoluble in hydrocarbons and halogenated hydrocarbons. |
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