pyrosulfurousacid,dipotassiumsalt
Potassium metabisulfite
CAS: 16731-55-8
Molecular Formula: K2O5S2
pyrosulfurousacid,dipotassiumsalt - Names and Identifiers
pyrosulfurousacid,dipotassiumsalt - Physico-chemical Properties
| Molecular Formula | K2O5S2 |
| Molar Mass | 222.32 |
| Density | 2.34 g/cm3 |
| Melting Point | 190°C |
| Water Solubility | Soluble in water. Insoluble in ethanol. |
| Solubility | H2O: 0.1M at20°C, clear, colorless |
| Vapor Density | 2.3 (vs air) |
| Appearance | White crystal |
| Specific Gravity | 2.3 |
| Color | White to slightly yellow |
| Odor | Odorless |
| Maximum wavelength(λmax) | ['267nm(H2O)(lit.)'] |
| Merck | 14,7645 |
| PH | 2.5-4.5 (25℃, 0.1M in H2O) |
| Storage Condition | Store at +5°C to +30°C. |
| Sensitive | Air Sensitive |
| MDL | MFCD00167605 |
| Physical and Chemical Properties | Colorless monoclinic platelets or white crystalline granules. The relative density was 2.34. Sulfur dioxide odor. Decomposition upon heating to 190 °c. Soluble in water. Slightly soluble in alcohol. Insoluble in ether. In case of acid decomposition to produce sulfur dioxide. |
| Use | Used as Chromatographic Reagents, developers, reducing agents and bacterial inhibitors |
pyrosulfurousacid,dipotassiumsalt - Risk and Safety
| Hazard Symbols | Xi - Irritant |
| Risk Codes | R31 - Contact with acids liberates toxic gas R36/37/38 - Irritating to eyes, respiratory system and skin. R41 - Risk of serious damage to eyes |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36 - Wear suitable protective clothing. S39 - Wear eye / face protection. |
| WGK Germany | 1 |
| RTECS | TT4920000 |
| FLUKA BRAND F CODES | 23 |
| TSCA | Yes |
| HS Code | 28322000 |
| Toxicity | LD50 orally in Rabbit: 2300 mg/kg |
pyrosulfurousacid,dipotassiumsalt - Nature
Open Data Verified Data
colorless crystal or white crystalline powder. There is the smell of sulfur dioxide. Melting point 190 C (decomposition);d2. 34. Soluble in water, aqueous solution is acidic. Insoluble in ethanol. Sulfur dioxide was released in case of acid. Oxidation to sulfate in humid air.
Last Update：2024-01-02 23:10:35
pyrosulfurousacid,dipotassiumsalt - Preparation Method
Open Data Verified Data
- wet method: a 45086 aqueous solution of potassium hydrogen sulfate was added to the reactor, and sulfur dioxide was introduced at 80 ° C. To effect a reaction so that the concentration of the solution was 41 to 420Be. The arsenic removing agent and the heavy metal removing agent were added, and the solution was purified and filtered, and the filtrate was cooled. Crystallization was performed at temperatures below 20 °c. After centrifugation and drying, the edible potassium metabisulfite product was prepared.
- Potassium bisulfite method: heating and dehydrating food-grade Potassium bisulfite to prepare the finished product of edible potassium metabisulfite.
Last Update：2022-01-01 09:02:47
pyrosulfurousacid,dipotassiumsalt - Introduction
It smells of sulfur dioxide. Sensitive to humidity. There is an acidic reaction. Sulfur dioxide escapes in contact with acid. It is gradually oxidized to sulfate in air and faster in humid air. If ground into powder, it can burn when it is hot. Easily soluble in water, insoluble in alcohol. Decomposition at 190 ℃. It's irritating.
Last Update：2022-10-16 17:14:18
pyrosulfurousacid,dipotassiumsalt - Use
Open Data Verified Data
is used as an analytical reagent, a developer, a reducing agent, a bacterial inhibitor, and the like.
Last Update：2022-01-01 09:02:47
pyrosulfurousacid,dipotassiumsalt - Safety
Open Data Verified Data
According to China's GB 2760-86, as a preservative can be used for wine, fruit wine maximum use of 0. 25g/kg. Sulfur dioxide residue should not exceed 0. 05g/kg. Packed with plastic woven bags lined with polyethylene plastic bags for food, each with a net weight of 25kg. Should be stored in a cool, ventilated, dry, clean warehouse, pay attention to moisture, not with acids, oxidants and toxic substances co-storage and transportation. Transportation should be protected against rain and sun exposure. When loading and unloading should be light to prevent packaging damage. In case of fire, it can be suppressed by water, sand and all kinds of fire extinguishing.
Last Update：2022-01-01 11:04:29
pyrosulfurousacid,dipotassiumsalt - Reference Information
| pH indicator color change ph range | 3-4.5 at 22.2g/l at 25 c |
| Decomposition | 150°C |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| identification test | solubility soluble in water, but insoluble in ethanol. Measured according to OT-42 method. Potassium test (IT-27) was positive. The sulfite test (IT-30) was positive. |
| content analysis | take 250mg of sample and add it to a flask with glass stopper containing 50.0 ml0.1mol/L iodine solution. After 5min, dilute hydrochloric acid test solution (TS117)lrnl was added, excess iodine was titrated with 0.1mol/L sodium thiosulfate, and starch test solution (TS-235) was used as indicator. 0.1mol/L iodine solution per mLL is equivalent to 5.558mg of potassium metabisulfite (K2S2O5). |
| toxicity | Adl 0~0.7 mg/kg (in terms of SO2, refers to the total ADI value of SO2 and sulfite; FAO/WHO,2001). LD50600 ~ 700 mg/kg (calculated as S02, rabbit, via mouth). GRAS(FDA, 182.3637,2000): GMP is limited, but meat and vitamin B. Except for source food, etc. according to the provisions of GB 2760-86 in our country, it can be used as preservative for wine, and the maximum usage of fruit wine is 0.25 g/kg. The residual amount of sulfur dioxide shall not exceed 0.05 g/kg. |
| usage limit | GB 2760-2002(g/kg): candied fruit, biscuits, glucose, sugar, crystal sugar, caramel, candy, liquid glucose, bamboo |
| use | used as food bleach, preservative and antioxidant. this product is a reducing bleach allowed in our country. It has bleaching effect on food and strong inhibitory effect and stronger reducibility on oxidase in plant food. China's regulations can be used for candied fruit, biscuits, candy, glucose, rock sugar, bamboo shoots, mushrooms and canned mushrooms, with a maximum use of 0.45 g/kg. It can also be used for beer with a maximum use of 0.01 g/kg. The residual amount (calculated as s02) of bamboo shoots, mushrooms, canned mushrooms, candied fruits, grapes and blackcurrant concentrated juice is less than O.05g/k; The residual amount of sugar, biscuits, vermicelli and other varieties is less than 0.1 g/kg; The residual amount of liquid glucose shall not exceed 0.2 g/kg. Used as chromatographic analysis reagent, developer, reducing agent and bacterial inhibitor Reducing agent, developer, bacterial inhibitor, antioxidant, preparation of sulfurous acid. |
| production method | the dry method is obtained by reacting potassium bicarbonate or potassium sulfate with SO2 gas in the converter. Wet potassium bicarbonate is prepared into an aqueous solution with a relative density of 1.45(45 ° Be), and SO2 gas is introduced at 80 ℃ to make the concentration of the solution reach a relative density of 1.39~1.41(41~42 ° Be), at which time the solution contains K2 S2 O5 60% ~ 62%; The solution is cooled to below 20 ℃ for crystallization, centrifuged and dried to obtain the finished product. Potassium sulfate is prepared into an aqueous solution of 35% ~ 40% by dehydration method, and sulfur dioxide produced by sulfur dioxide combustion is absorbed to generate potassium bisulfite. The product is obtained by crystallization, separation (mother liquor reuse) and drying. O2 + S → SO2[K2SO4] → KHSO3[-H2O] → K2S2O5 The 45 ° Bé aqueous solution prepared by potassium bisulfate is added to the reactor by wet method, and sulfur dioxide is introduced at 80 ℃ for reaction, so that the concentration of the solution reaches 41~42 ° Bé. Add arsenic removal agent and heavy metal removal agent for solution purification and filtration, and cool the filtrate. Crystallization is carried out below 20°C. After centrifugal separation and drying, a finished product of edible potassium metabisulfite is prepared. The potassium bisulfite method heats and dehydrates the edible grade potassium bisulfite to produce the edible potassium metabisulfite product, its 2KHSO3 → K2S2O5 H2O |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-09 20:52:54
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