Molecular Formula | CaHO4P |
Molar Mass | 136.06 |
Density | 2.306(16℃) |
Melting Point | 370°C(decomposition) |
Water Solubility | Sparingly soluble in water, practically insoluble in cold water. |
Solubility | Practically insoluble in water and in ethanol (96 per cent). It dissolves in dilute hydrochloric acid and in dilute nitric acid. |
Appearance | gel (aged) |
Color | White |
Solubility Product Constant(Ksp) | pKsp: 7 |
Merck | 13,1697 |
PH | 7 (10g/l, H2O, 20°C) suspension |
Storage Condition | 2-8°C |
Stability | Stable. Incompatible with strong oxidizing agents. |
MDL | MFCD00010909 |
Physical and Chemical Properties | White monoclinic crystalline powder. Odorless and tasteless. Soluble in dilute hydrochloric acid, dilute nitric acid, acetic acid, water-soluble, insoluble in ethanol. |
Use | Used for various crops as base fertilizer |
Hazard Symbols | Xi - Irritant |
Risk Codes | 36/37/38 - Irritating to eyes, respiratory system and skin. |
Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36 - Wear suitable protective clothing. S24/25 - Avoid contact with skin and eyes. S22 - Do not breathe dust. |
WGK Germany | 3 |
RTECS | TB8528000 |
TSCA | Yes |
HS Code | 2835 25 00 |
Toxicity | LD50 orally in Rabbit: 10000 mg/kg LD50 dermal Rabbit > 7940 mg/kg |
Raw Materials | Sulfuric acid Sulfuric acid Potassium Sulphate Potassium Sulphate Urea Urea Calcium superphosphate |
white monoclinic crystalline powder. Odorless and tasteless. The relative density was 2. 306 (16 ℃). Soluble in dilute hydrochloric acid, dilute nitric acid, acetic acid, water-soluble, insoluble in ethanol. Two crystals of water are lost at 115-120 °c and calcium pyrophosphate is formed when heated above 400 °c. Less hygroscopic.
This product contains CaHPO, should be 98. 0% ~ 103.0%.
It is mainly used as fertilizer, and can be used in acidic, slightly acidic or neutral soil. It is suitable for all kinds of crops. It is also used as a stabilizer for plastics.
acid solution of this product shows the reaction of calcium salt and phosphate to identify (2) and (3) (General rule 0301).
packed in polyethylene-lined plastic bags, with a cover of 25kg or 50kg in net weight, in either or in woven bags. Should be stored in a cool, ventilated, dry warehouse, to avoid open storage. It is not allowed to be stored and mixed with toxic substances and polluting substances; During transportation, it should be protected from rain, sun and moisture. Handling should be careful to prevent package breakage. Fire, water, sand, carbon dioxide fire extinguishing.
take 0.20g of this product, add 1 0m l of water and 2 m l of nitric acid, slowly heat until dissolved, cool, and check according to law (General rule 0801), with standard gasification sodium solution 1 0. Compared with the control solution made of 0M l, it should not be more concentrated (0. 05%).
take this product l .O g, add a small amount of dilute hydrochloric acid, so that it can be dissolved, dilute to 100ml with water, shake well, filter, take 20ml of filtrate, add 5ml of water, check according to law (General Rule 0 8 0 2 ) , with standard potassium sulfate solution 4. Compared with the control solution made of 0M l, it should not be more concentrated (0 .2%).
A plastic appliance was used for the operation. Precision weigh% sodium fluoride dried at 1051C for 4 hours, put it in a 100ml measuring flask, add appropriate amount of water to dissolve, and add buffer solution (take sodium citrate 73. 5G, add water 250ml to dissolve, that is, 5 0 .0 m l, diluted with water to the scale, shake, that is, the fluoride standard stock solution (l/lm equivalent to F lm g). The appropriate amount of fluoride standard stock solution was accurately taken, and the standard solution containing F 0 .1, 0.2, 0.5 and 1. 0 was prepared by adding buffer solution to dilute each lm l. Take about 2.0g of this product, weigh it accurately, put it in a 100ml measuring flask, add 20ml of water and hydrochloric acid 2.0ML, shake to dissolve, add 50ml of buffer solution, dilute to the scale with water, and shake to obtain the test solution. With fluoride ion selective electrode as indicator electrode and saturated calomel electrode as reference electrode, the potential response values (m V) of the standard solution and the test solution were measured respectively. The standard curve is drawn with log c of fluoride ion concentration (p g /m l) as the z axis and the potential response value as the y axis, according to the measured potential value of the test solution, the concentration of fluoride ion in the Test Solution is determined from the standard curve. 005%.
take this product l .O g, add water 5 m l, mix, add hydrochloric acid 2ml, do not bubble boiling.
take about 5.0g of this product, weigh it accurately, add 10ml hydrochloric acid and 40ml water, heat and dissolve it, dilute it to 100ml with water, if there is insoluble matter, filter it, the filter residue was washed with water until the washing liquid was free from the reaction of the vaporized product, and dried at 105 ° C. For 1 hour, and the remaining residue should not pass through 5mg.
take this product about l .O g, precision weighing, at 800X; Ignition to constant weight, loss weight should be 6.6% ~ 8.5%.
take this product 0. 50g, add 10 m l of water, heat, add hydrochloric acid Dropwise, stir with the drop, dissolve, filter, add 2ml of potassium sulfate test solution to the filtrate, and do not cause turbidity within 10 minutes.
take this product 2. 5G, add dilute hydrochloric acid 20ml, heat to dissolve, dilute to 50 m l with water, take the dilution 1 .0 m l, checked according to law (General rule 0807), with standard iron solution 2. 0 m l made of control liquid comparison, not deeper (0. 04%).
take this product about 0 .2G, precision weighing, 50ml flask, with nitric acid solution (1-100) dissolved and diluted to the scale, shake, as a test solution; take an appropriate amount of standard lead solution (equivalent to 10 tons of Pb per lm l) and dilute it with nitric acid solution (1-100) to make it contain Ong, 10ng, 20ng, 30ng and 40ng per lm l, 50Ng of the control solution. According to Atomic Absorption Spectrophotometry (General Principles 0406 first method>, the graphite furnace is used as an atomizer, measured at a wavelength of 283.3mn, and calculated. Lead should not exceed 0.0005%.
take this product l .O g, add hydrochloric acid 5M l and water 23tnl after dissolving, according to law inspection (General Principles 0822 The first law), should comply with the provisions (0. 0002%).
take this product about 0 .6G, precision weighing, add dilute hydrochloric acid 1 0 m l, heat to dissolve, cool, move to 100ml measuring flask, dilute with water to the scale, shake; Take 1 0 m l for precision measurement, add 50ml of water, adjust to Neutral with ammonia test solution, add 2 5 m L of ethylenediamine tetraacetic acid disodium titration solution (0.05mol/l), heat for several minutes, and cool, add 10ml of ammonia-gasified ammonium buffer (pH 10.0) and a small amount of Chrome Black T indicator, and use zinc titration solution (0.0 5 M o l/U titration to the solution is purple red, and the results of the titration with blank test correction. Each lm l of ethylene diamine tetraacetic acid disodium titration solution (0.05M o l/L) is equivalent to 6.803mg of cahp04.
pharmaceutical excipients, diluents.
sealed storage.
EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
Introduction | dicalcium phosphate (also known as dicalcium phosphate) is a compound, usually dihydrate (CaHPO4 · 2H2O) but can be changed to an anhydrous form by heating. Dibasic calcium phosphate is practically insoluble in water with a solubility of only 0.02g/100 at 25°C. |
properties | calcium hydrogen phosphate is a white monoclinic crystalline powder, odorless and tasteless, soluble in dilute hydrochloric acid, nitric acid, acetic acid, slightly soluble in water. The relative density was 2.32. Stable in air. Water loss began at 75 degrees C to generate anhydrous calcium hydrogen phosphate. |
Use | calcium hydrogen phosphate can be used as buffering agent; Coagulant; Flour improver nutritional supplement, yeast food, emulsifier, curing agent, antioxidant Synergist, stabilizer. Such as canned cherry core material, milk powder, cream powder, cold drinks, ice cream, potato, snack food, flour, cake, cake, baking quality improver. as a supplementary feed for poultry, it can promote the digestion of the feed, and can also treat the fistula disease, cartilage disease and anemia of livestock. As a food feed additive, to supplement the phosphorus and calcium in livestock feed. as a fortifier (calcium supplement) and leavening agent, China's provisions can be used for biscuits, infant formula food, the maximum use of 1.0g/kg; Can also be used as a quality improver for fermented flour products, according to the production needs of appropriate use. used in various crops as base fertilizer can be widely used in bone substitute materials, plastic and cosmetic surgery, dental, chromatography purification, calcium supplements. |
range of use | calcium hydrogen phosphate as a coagulant can be used in biscuits, infant formula. |
production method | double decomposition method firstly, phosphoric acid and soda ash are neutralized to form a mixture of sodium dihydrogen phosphate and disodium hydrogen phosphate, then add slightly less than the theoretical amount of calcium chloride solution, double decomposition reaction under high-speed stirring; And then neutralized to methyl red and methyl blue mixed indicator, from purple to light green, to precipitate, finally, the precipitate was separated and washed with water to obtain a final product. 4H2PO4+3Na2CO3 → 2Na2HPO4+2nah2po4 [CaCl2] → CaHPO4 · 2H2O direct neutralization method high quality industrial lime is obtained by calcining limestone, then, the reaction was digested with 4 times of water at 90 ° C. For 75min, filtered and then diluted to obtain a milk of lime with a relative density of 1.03; 85% of the food-grade hot phosphoric acid was diluted to a solution with a relative density of 1.21, under high-speed stirring, the milk of lime is added to the phosphoric acid solution, the reaction temperature is controlled at 40~45 ℃, and the milk of lime is controlled to slowly add after precipitation of white precipitate; The terminal pH value of the reaction is 7.2, after aging for 0.5h, the product was finally obtained by washing, centrifugal dehydration, drying and grinding. H3PO4 + Ca(OH)2 → CaHPO4 · 2H2O (1) Water + calcium method. With agricultural ordinary superphosphate as raw material, obtained by multi-stage water extraction, defluorination, Lime milk neutralization. The soluble phosphorus pentoxide in superphosphate is extracted from the solid phase by multistage extraction with water (solid-liquid ratio 1.0-4.1). The extraction is accompanied by addition of sodium chloride or Activated Silica for defluorination purification. The phosphogypsum residue was then removed by plate-and-frame pressure filtration. The filtrate was neutralized with milk of lime containing between 6% and 8% of Cao, and the neutralized solution was allowed to stand, filtered and dried to obtain a finished product. (2) sulfuric acid extraction of phosphoric acid direct neutralization method. The phosphoric acid extracted by sulfuric acid is metered into the defluorination tank, and the defluorination agent is added to remove fluorine, arsenic, lead, etc. After defluorination, the phosphoric acid first enters into a neutralization tank, and is neutralized with milk of lime. The filter residue is filtered as a byproduct fertilizer, and the filtrate enters into a second-stage neutralization tank, and is further neutralized with milk of lime, The filtered filtrate was returned to prepare a milk of lime, and the filter cake was air dried and pulverized to a product. Phosphoric acid can also be obtained by direct neutralization with limestone: The calcined limestone is charged with 70%-80% phosphoric acid, and mixed and stirred at 40-50 ° C. To form a mixture of calcium hydrogen phosphate and calcium dihydrogen phosphate. After curing, cut it with a cutter, and stack it in the curing library for 48h. During this time, the remaining calcium carbonate reacts with dicalcium phosphate to form dicalcium phosphate. The curing material contains 15%-20% of water, and is baked in a rotary kiln to below 3% of water content, and then pulverized to obtain a finished product. |
category | toxic substances |
flammability hazard characteristics | non-combustible; A pollution dust; One of air pollutants |
storage and transportation characteristics | warehouse ventilation and low temperature drying |
extinguishing agent | Water |
toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |