아인산

그림문자(GHS)

• 그림문자(GHS)

  

• 신호 어

  Danger

• 유해·위험 문구

  H290：금속을 부식시킬 수 있음

  H302：삼키면 유해함

  H314：피부에 심한 화상과 눈에 손상을 일으킴

• 예방조치문구

  P234：원래의 용기에만 보관하시오.

  P270：이 제품을 사용할 때에는 먹거나, 마시거나 흡연하지 마시오.

  P280：보호장갑/보호의/보안경/안면보호구를 착용하시오.

  P301+P312：삼켜서 불편함을 느끼면 의료기관(의사)의 진찰을 받으시오.

  P303+P361+P353：피부(또는 머리카락)에 묻으면 오염된 모든 의복은 벗거나 제거하시오 피부를 물로 씻으시오/샤워하시오.

  P305+P351+P338：눈에 묻으면 몇 분간 물로 조심해서 씻으시오. 가능하면 콘택트렌즈를 제거하시오. 계속 씻으시오.

아인산 화학적 특성, 용도, 생산

• 개요

  Phosphorous acid, H3PO3, is diprotic (readily ionizes two protons), not triprotic as might be suggested by this formula. Phosphorous acid is as an intermediate in the preparation of other phosphorous compounds. Because preparation and uses of “phosphorous acid” actually pertain more to the major tautomer, phosphonic acid, it is more often referred to as “phosphorous acid”. Phosphorous acid has the chemical formula H3PO3, which is best expressed as HPO(OH)2 to show its diprotic character. P(OH)3 (IUPAC: phosphorous acid) has CAS number 10294-56-1. It has been shown to be a stable tautomer.

• 화학적 성질

  Phosphorous acid is a white crystalline deliquescent solid that can be prepared by the action of water on phosphorus( III) oxide or phosphorus(III) chloride. It is a dibasic acid producing the anions H2PO3- and HPO3 2- in water. The acid and its salts are slow reducing agents. On warming, phosphonic acid decomposes to phosphine and phosphoric(V) acid. Phosphorus acid is used to prepare phosphite salts. It is usually sold as a 20% aqueous solution.

• 물리적 성질

  White crystalline mass; deliquescent; garlic-like odor; density 1.651 g/cm³ at 21°C; melts at 73.6°C; decomposes at 200°C to phosphine and phosphoric acid; soluble in water, about 310 g/100mL; K₁ 5.1x10^-2 and K₂ 1.8x10^-7; soluble in alcohol.

• 용도

  Phosphorous acid is used to produce the fertilizer phosphate salt like potassium phosphite, ammonium phosphite and calcium phosphite. It is actively involved in the preparation of phosphites like aminotris(methylenephosphonic acid) (ATMP), 1-hydroxyethane 1,1-diphosphonic acid (HEDP) and 2-phosphonobutane-1,2,4-tricarboxylic Acid (PBTC), which find application in water treatment as a scale or corrosive inhibitor. It is also used in chemical reactions as a reducing agent. Its salt, lead phosphite is used as PVC stabilizer. It is also used as a precursor in the preparation of phosphine and as an intermediate in the preparation of other phosphorus compounds.

• 제조 방법

  Phosphorus acid can be prepared by the reaction of phosphorus trichloride with water:
  PCl₃ + 3H₂O → H₃PO₄ + 3HCl
  The reaction is violent. Addition of PCl₃ should be extremely cautious and slow. The addition can be carried out safely in the presence of concentrated HCl. Alternatively, a stream of air containing PCl₃ vapor is passed into icecold water and solid crystals of H₃PO₄ form.
  Alternatively, phosphorus acid can be prepared by adding phosphorus trichloride to anhydrous oxalic acid:
  PCl₃ + 3(COOH）₂ → H₃PO₃ + 3CO + 3CO₂ + 3HCl
  In this reaction, all products except H₃PO₃ escape as gases leaving the liquid acid.
  Dissolution of phosphorus sesquioxide in water also forms phosphorus acid. When shaken with ice water, phosphorus acid is the only product .
  P₄O₆ + 6H₂O → 4H₃PO₃
  However, in hot water part of the phosphorus acid disproportionates to phosphoric acid and phosphorus or phosphine.

• 정의

  ChEBI: Phosphorous acid is a phosphorus oxoacid. It is a conjugate acid of a dihydrogenphosphite. It is a tautomer of a phosphonic acid.

• 주요 응용

  Phosphorous acid (H3PO3, orthophosphorous acid) may be used as one of the reaction components for the synthesis of the following:
  α-aminomethylphosphonic acids via Mannich-Type Multicomponent Reaction
  1-aminoalkanephosphonic acids via amidoalkylation followed by hydrolysis
  N-protected α-aminophosphonic acids (phospho-isosteres of natural amino acids) via amidoalkylation reaction

• 일반 설명

  Phosphorous acid appears as a white or yellow crystalline solid (melting point 70.1 deg C) or a solution of the solid. Density 1.651 g /cm3 . Contact may severely irritate skin, eyes, and mucous membranes. Toxic by ingestion, inhalation and skin absorption.

• 공기와 물의 반응

  Deliquescent. Absorbs oxygen from the air very readily to form phosphoric acid [Hawley]. Soluble in water.

• 반응 프로필

  Phosphorous acid decomposes when heated to form phosphine, a gas that usually ignites spontaneously in air. Absorbs oxygen from the air to form phosphoric acid [Hawley]. Forms yellow deposits in aqueous solution that are spontaneously flammable upon drying. Reacts exothermically with chemical bases (for example: amines and inorganic hydroxides) to form salts. These reactions can generate dangerously large amounts of heat in small spaces. Dissolution in water or dilution of a concentrated solution with additional water may generate significant heat. Reacts in the presence of moisture with active metals, including such structural metals as aluminum and iron, to release hydrogen, a flammable gas. Can initiate the polymerization of certain alkenes. Reacts with cyanide compounds to release gaseous hydrogen cyanide. May generate flammable and/or toxic gases in contact with dithiocarbamates, isocyanates, mercaptans, nitrides, nitriles, sulfides, and strong reducing agents. Additional gas-generating reactions occur with sulfites, nitrites, thiosulfates (to give H2S and SO3), dithionites (to give SO2), and carbonates (to give CO2).

• 건강위험

  TOXIC; inhalation, ingestion or skin contact with material may cause severe injury or death. Contact with molten substance may cause severe burns to skin and eyes. Avoid any skin contact. Effects of contact or inhalation may be delayed. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution.

• 화재위험

  Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.). Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated.

• 공업 용도

  This collector was developed recently and was used primarily as specific collector for cassiterite from ores with complex gangue composition.On the basis of the phosphonic acid, Albright and Wilson had developed a range of collectors mainly for flotation of oxidic minerals (i.e. cassiterite, ilmenite and pyrochlore). Very little is known about the performance of these collectors. Limited studies conducted with cassiterite and rutile ores showed that some of these collectors produce voluminous froth but were very selective.

• Safety Profile

  Moderately toxic by ingestion. When heated to decomposition at 200℃ it emits toxic fumes of POx and phosphme whch may ignite. See also PHOSPHINE.

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