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Send EmailPotassium bitartrate, Potassium acid tartrate, Acid potassium tartrate, Potassium hydrogen tartrate, 868-14-4, 35-04-1, 6381-58-4
Potassium bitartrate
CAS: 868-14-4;35-04-1;6381-58-4
Molecular Formula: C4H5KO6
Names and Identifiers
Physico-chemical Properties
| Molecular Formula | C4H5KO6 |
| Molar Mass | 188.18 |
| Density | 1.954g/mLat 25°C(lit.) |
| Melting Point | 267°C (dec.) |
| Boling Point | 318℃[at 101 325 Pa] |
| Specific Rotation(α) | 32.5 º (c=10, 1N NaOH) |
| Flash Point | 210℃ |
| Water Solubility | Soluble in water and dilute mineral acid. Insoluble in alcohol. |
| Solubility | 1g dissolved in 162ml of water, 16ml of boiling water and 8820ml of ethanol. Easily soluble in dilute mineral acid, alkali solution and borax solution, soluble in boiling water, slightly soluble in cold water, very slightly soluble in alcohol. |
| Vapor Presure | 30.69hPa at 25.2℃ |
| Appearance | White crystalline powder |
| Specific Gravity | 1.954 |
| Color | Colorless opaque or white |
| Odor | Odorless |
| Merck | 14,7615 |
| BRN | 6119985 |
| PH | 3.4-3.7 (H2O, 20℃)(saturated solution) |
| Storage Condition | Inert atmosphere,Room Temperature |
| Stability | Stable. Incompatible with strong oxidizing agents. |
| Sensitive | Easily absorbing moisture |
| MDL | MFCD00065392 |
| Physical and Chemical Properties | Colorless or white crystalline powder. The relative density was 1.984. Soluble in dilute inorganic acid, alkali solution or borax solution. Insoluble in ethanol or acetic acid. Solubility in water. t,℃ 0 20 40 60 80 100KHC4H4O6,% 0.32 0.54 1.19 2.40 4.40 6.50 |
| Use | Used as Capacity Analysis, buffer, reducing agent and food industry leavening agent |
Risk and Safety
| Safety Description | 24/25 - Avoid contact with skin and eyes. |
| WGK Germany | 1 |
| RTECS | WW8223000 |
| TSCA | Yes |
| HS Code | 29181300 |
Upstream Downstream Industry
| Raw Materials | Hydrogen peroxide (2R,3R)-2,3-Dihydroxybernsteinsaeure Potassium hydroxide Maleic anhydride Potassium carbonate |
| Downstream Products | Potassium bitartrate |
Nature
colorless crystal or white crystalline powder. lg the product is soluble in 162ml water, 16mL boiling water, soluble in dilute inorganic acid and alkali solution or boric acid solution, slightly soluble in ethanol (lg dissolved in 8820mL), insoluble in acetic acid.
Preparation Method
tartaric acid was added to water, heated, dissolved and filtered, and anhydrous potassium carbonate was added to water, dissolved, and then filtered while hot. This solution was added to the tartaric acid solution and a large amount of white precipitate precipitated during the reaction. The crystals were cooled, filtered off with suction, washed with a small amount of cold water and dried to obtain the product potassium hydrogen tartrate.
Introduction
Sour taste.
Use
used for volumetric analysis, buffer, reducing agent and food industry leavening agent.
Reference Information
| pH range of acid-base indicator discoloration | 3.4 - 3.7 at 20°C |
| LogP | -5.14 |
| Introduction | potassium hydrogen tartrate is the acid salt of potassium tartrate. Usually colorless to white orthorhombic crystalline powder, solubility in water changes with temperature, insoluble in ethanol, acetic acid, soluble in inorganic acid; Is a by-product of wine, the food industry is called Tower powder and is used as an additive, bulking agent, and also as a reducing agent and buffering agent. |
| preparation | a pH reference reagent potassium hydrogen tartrate preparation method, the specific steps are:(1) 40kg of industrial tartaric acid was dissolved in 40kg of deionized water, the solution was heated, 100g of Ammonium Sulfide was added, the reaction temperature was 80 ° C., the reaction time was 1H, and the mixture was kept for 1H and filtered. (2) 80g of barium nitrate was added to the filtrate, and the reaction temperature was 80 ° C. And the reaction time was 0.5h. After being kept for 1h, the filtrate was filtered with activated carbon to obtain a pure tartaric acid solution. (3) 17kg of industrial potassium carbonate was dissolved in 20kg of deionized water, heated and dissolved, 1kg of potassium hydroxide was added, the reaction temperature was 50 ℃, the reaction time was 0.5h, the temperature was kept for 1h, and the mixture was filtered with activated carbon, A pure potassium carbonate solution was obtained. (4) the pure potassium carbonate solution is slowly added to the pure tartaric acid solution under constant stirring until the pH value of the solution is 3.55 and the reaction temperature is 70 ° C. A large amount of white precipitate is precipitated during the reaction, the crystals were extracted. (5) the crystal is washed with a small amount of cold water, dehydrated by a dehydrator, and the dehydrated crystal is put into a drying oven for constant temperature drying, the drying temperature is 80 ° C, and the drying time is 9H, the pH reference reagent potassium hydrogen tartrate was obtained. |
| trait | colorless rhombic crystals. |
| Use | potassium hydrogen tartrate can be used as an analytical reagent, an imaging agent, a reducing agent, and a bacterial inhibitor, and is used for making baking powder and diuretic and laxative, and for the preparation of tartrate. Potassium hydrogen tartrate is used for making baking powder, diuretic and laxative, and tartrate. bulking agents; Anti-caking agents; Preservatives; Hygroscopic agents; pH regulators; Processing aids; Acidulants; Stabilizers and thickeners; Surfactants; Buffers; Emulsifying salts; Sucrose conversion agents; flavor Enhancer (often used in combination with sodium bicarbonate). For baked food, the amount is not specified, up to 50% of the total amount of leavening agent. For candy, frosting, gelatin and pudding, Hard Candy, jelly, jam, soft candy, etc. It is used in condiment, food processing, electroplating and pharmaceutical industries as an analytical reagent, a buffer and a reducing agent. In the food industry is mainly used as leavening agent (making cakes and bread, etc.). used as Capacity Analysis, buffer, reducing agent and food industry leavening agent, etc. used in food processing, electroplating, pharmacy, etc, for the pharmaceutical industry and the preparation of microbial culture medium used as analytical reagents and corrosion inhibitors as a coagulant, China can be used for baking powder, the maximum use of 250g/kg. volumetric analysis reagent. Buffer. Manufacturing tartrate, baking powder. |
| identification test | take 1g of the sample, dissolve it in TS-13 ammonia solution (), and determine its optical rotation according to the conventional method, should be right-handed. A sample of 0.5g was taken and slowly heated, I .e. decomposed to produce a sucrose-like odor, and charring. Add 5ml of water to the Carbonized residue and shake well to be alkaline. Dilute hydrochloric acid solution (TS-117) was added for neutralization and filtration. The filtrate should be positive for the potassium test (IT-27). The tartrate test (IT-31) was positive for saturated aqueous solutions. |
| content analysis | accurately weigh 105g of sample pre-dried at 0.4 ℃ for 3H, heat and dissolve in 20ml of water, phenolphthalein test solution (TS-167)2~3 drops, while hot with 0.1mol/L sodium hydroxide solution titration. Each mL of 0.1mol/L sodium hydroxide solution is equivalent to 18.82mg of potassium hydrogen L-tartrate (C4H5KO6). |
| toxicity | Same as d-tartaric acid. GRAS(FDA,§ 184.1077,2000). ADI 0~30mg/kg (calculated as tartaric acid; FAO/WHO,2001) |
| usage limit | GB 2760-1996: baking powder 250g/kg. |
| preparation method | potassium hydrogen tartrate was prepared by extracting tartar with water and then crystallizing. |
| production method | The product was obtained by directly neutralizing tartaric acid and potassium carbonate to pH = 2, then cooling and crystallizing. Wine brewing process by-product tartar (containing potassium hydrogen tartrate 50% ~ 85%) as raw material, acid or alkali decomposition, recrystallization and the product. Acid Decomposition method with hot water extraction of crude tartar, and then add hydrochloric acid or sulfuric acid, decolorization, filtration, neutralization with soda ash to pH value of about 2, precipitation of potassium hydrogen tartrate crystals, isolated products. The hot water extract of crude Tartar by alkali decomposition is neutralized with soda ash, decolorized and filtered, and then adjusted to pH = 2 by sulfuric acid to precipitate potassium hydrogen tartrate crystals, and the product is separated. 3.3kg of tartaric acid was added to 2L of water, heated and boiled until all dissolved, and filtered while hot. Another 1.4kg of anhydrous potassium carbonate was dissolved in 1L of water, dissolved and filtered while hot. The purple solution was slowly added to the stirred tartaric acid solution (with substantial carbon dioxide formation) until the pH of the solution was about 2. A large amount of white precipitate was precipitated during the reaction. Cooling, Suction filtration, washing with cold water, the product. The by-product after alcohol removal in wine brewing is obtained by recrystallization by the following method. Acid Decomposition method of raw tartar solution with hydrochloric acid or sulfuric acid, After decolorization and filtration, to obtain refined potassium hydrogen sulfate tartrate solution, The crystallization was precipitated by adding soda ash and separated. Alkali decomposition method of raw tartar solution plus soda ash neutralization, decolorization, filtration, plus sulfuric acid to crystallize out the obtained. After neutralization with d-tartaric acid and potassium carbonate, d-tartaric acid solution was added to crystallize out. |
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