POTASSIUM HYDROGEN CARBONATE
Potassium bicarbonate
CAS: 298-14-6
Molecular Formula: CHKO3
POTASSIUM HYDROGEN CARBONATE - Names and Identifiers
| Name | Potassium bicarbonate |
| Synonyms | bicarbonate POTASSIUM BICARBONATE Potassium bicarbonate Potassium acid carbonate POTASSIUM ACID CARBONATE Potassium hydrogen carbonate POTASSIUM HYDROGEN CARBONATE Carbonicacidmonopotassiumsalt Carbonicacid,monopotassiumsalt Potassium hydrogen carbonate, ACS (dried basis) |
| CAS | 298-14-6 |
| EINECS | 206-059-0 |
| InChI | InChI=1/CH2O3.K/c2-1(3)4;/h(H2,2,3,4);/q;+1/p-1 |
| InChIKey | TYJJADVDDVDEDZ-UHFFFAOYSA-M |
POTASSIUM HYDROGEN CARBONATE - Physico-chemical Properties
| Molecular Formula | CHKO3 |
| Molar Mass | 100.12 |
| Density | 2,17 g/cm3 |
| Melting Point | 292 °C |
| Water Solubility | Soluble in water. Insoluble in alcohol. |
| Solubility | In 2.8 parts of water and 2 parts of water at 50 ℃, soluble in potassium carbonate solution, insoluble in ethanol. |
| Appearance | Colorless crystal |
| Specific Gravity | 2.17 |
| Color | White |
| Odor | Odorless |
| Maximum wavelength(λmax) | ['λ: 260 nm Amax: 0.010', , 'λ: 280 nm Amax: 0.01'] |
| Merck | 14,7609 |
| BRN | 4535309 |
| pKa | 10.33(at 25℃) |
| PH | 8.27(1 mM solution);8.25(10 mM solution);8.13(100 mM solution); |
| Storage Condition | Store at +15°C to +25°C. |
| Stability | Stable. |
| Sensitive | Easily absorbing moisture |
| MDL | MFCD00011402 |
| Physical and Chemical Properties | colorless transparent monoclinic crystal. |
| Use | For the production of potassium carbonate, potassium acetate, potassium arsenite and other raw materials, also used in medicine, food, fire extinguishing agents and other industries |
POTASSIUM HYDROGEN CARBONATE - Risk and Safety
| Risk Codes | R22 - Harmful if swallowed R35 - Causes severe burns |
| Safety Description | S24/25 - Avoid contact with skin and eyes. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. |
| WGK Germany | 1 |
| RTECS | FG1840000 |
| FLUKA BRAND F CODES | 3 |
| TSCA | Yes |
| HS Code | 28364000 |
| Toxicity | LD50 orally in Rabbit: > 2000 mg/kg |
POTASSIUM HYDROGEN CARBONATE - Upstream Downstream Industry
| Raw Materials | Potassium chloride Potassium chloride Ammonium Bicarbonate Ammonium Bicarbonate |
| Downstream Products | potassium sodium tartrate Potassium Tetrafluoroborate Potassium carbonate |
POTASSIUM HYDROGEN CARBONATE - Reference
| Reference Show more | 1. Xu Jia, Zuo Yong, Yi Yuan, Ma Qian, Hu Min. Study on fermentation conditions optimization and flavor change of Kette apricot wine [J]. China Brewing, 2020,39(11):137-142. |
POTASSIUM HYDROGEN CARBONATE - Preparation Method
Open Data Verified Data
using earth alkali (containing 40% to 60% of potassium carbonate) as a raw material, organic matter is removed by roasting, potassium sulfate and potassium chloride are removed by dissolution, and impurities such as aluminum, silicon and phosphorus are removed. The filtrate was then evaporated to form a potassium carbonate solution and reacted with carbon dioxide. Alternatively, potassium chloride and ammonium bicarbonate are used as raw materials, and the mixed solution is obtained by ion exchange, so that it is evaporated and decomposed to generate potassium carbonate solution. The potassium carbonate solution is carbonized to generate potassium bicarbonate, and then crystallized, separated, washed, obtained by drying.
Last Update：2022-01-01 09:02:28
POTASSIUM HYDROGEN CARBONATE - Nature
Open Data Verified Data
colorless transparent crystal, white particles or powder. d 2.17; N1.482. Soluble in 2.8 parts of water, 2 parts of 50 Deg C of water, almost insoluble in fermentation. Decomposition by heating. 0. Imol aqueous solution pH 8.2
Last Update：2024-01-02 23:10:35
POTASSIUM HYDROGEN CARBONATE - Standard
Authoritative Data Verified Data
This strain is obtained by cooling and crystallizing in saturated potassium carbonate solution and carbon dioxide. The content of KHC03 shall not be less than 99.0% based on the dry product.
Last Update：2024-01-02 23:10:35
POTASSIUM HYDROGEN CARBONATE - Trait
Authoritative Data Verified Data
- This product is white or off-white crystalline powder or colorless crystal.
- This product is soluble in water and almost insoluble in ethanol.
Last Update：2022-01-01 11:28:23
POTASSIUM HYDROGEN CARBONATE - Introduction
It's hygroscopic. Decomposition at 100 ℃. When the aqueous solution is boiled, carbon dioxide escapes and becomes potassium carbonate. The pH of 0-1mol/L aqueous solution is 8-2.
Last Update：2022-10-16 17:24:22
POTASSIUM HYDROGEN CARBONATE - Use
Open Data Verified Data
is commonly used as an analytical reagent, baking powder, and foaming agent. It is also used in fire extinguishing agents for petroleum and chemicals and in the production of potassium carbonate and other potassium salts.
Last Update：2022-01-01 09:02:28
POTASSIUM HYDROGEN CARBONATE - Differential diagnosis
Authoritative Data Verified Data
This product shows the identification reaction of potassium salt (1) and bicarbonate (General rule 0301).
Last Update：2022-01-01 11:28:23
POTASSIUM HYDROGEN CARBONATE - Safety
Open Data Verified Data
no special combustion and explosion characteristics. Store in a dry, ventilated warehouse. Should be stored separately from the acid, etc., should not be mixed storage.
Last Update：2022-01-01 09:02:29
POTASSIUM HYDROGEN CARBONATE - Exam
Authoritative Data Verified Data
alkalinity
take 0631g of this product, add 50ml of water to dissolve, check according to law (General rule 8.6),pH value shall not exceed.
clarity and color of solution
Take 5.0g of this product, add 0901 of water to dissolve, check according to law (General rule 0902 and general rule), the solution should be clear and colorless.
carbonate
take 3.0g of this product, put it in a porcelain mortar, add 25ml of ethanol and 5ml of water to grind. Phenolphthalein indicator solution was added dropwise 3 drops, and titrated with barium chloride solution (barium chloride 12.216G was accurately weighed, dissolved in 300ml water and ethanol was added to volume to 1000ml) until the suspension became colorless. After grinding for 2 minutes, if the suspension turns pink, titration with vaporized barium solution is continued to be colorless; If necessary, the solution of barium chloride is added dropwise repeatedly and the grinding is continued for 2 minutes until the end point of the suspension is no longer pink after grinding. Each 1 ml of barium chloride solution corresponds to 6.211 mg of potassium carbonate. Carbonate-containing
Not more than 2.5%.
chloride
take 0.33g of this product, add water to dissolve it into 25ml, add nitric acid Dropwise to make it slightly acidic, place it in a water bath and heat it to remove carbon dioxide and let it cool, inspection according to law (General rule 0801), and standard sodium chloride solution 5 .0ml of the control solution should not be more concentrated (0.015%).
sulfate
take this product l. After adding hydrochloric acid Dropwise to make it slightly acidic, heat in a water bath to remove carbon dioxide, cool, and check according to law (General rule 0802), not more concentrated (0.015%) than the control solution made of standard potassium sulfate solution.
ammonium salt
take this product l. Log, add 50ml of water to dissolve, add 2ml of alkaline potassium iodide test solution, place for 15 minutes, check according to law (General rule 0808 ) ; If the color is developed, compare with the control solution made of ML of standard ammonium chloride solution, not deeper (0.002%).
loss on drying
take 4.0g of this product, dry it in a silica gel dryer for 4 hours, and lose no more than 0.3% of weight (General rule 0831).
calcium salt
take this product l. After adding 50ml of fresh boiling cold water, add 2ml of ammonia test solution lm l and ammonium oxalate test solution, shake and place for 2 hours; In case of turbidity, with standard calcium solution (precision weighing calcium carbonate 0.125g, into a 500ml measuring flask, add 5ml of mixed solution of water and hydrochloric acid 0.5ml to dissolve, dilute to the scale with water, shake, each lml is equivalent to 0.lmg of Ca)l. 0ml of the control solution should not be more concentrated (0.01%).
Iron Salt
take this product l. After adding appropriate amount of water to dissolve, dilute hydrochloric acid is added to make it slightly acidic, carbon dioxide gas is removed by boiling, cooled and diluted with water to make 25ml, which shall be checked according to law (General rule 0807), it should not be deeper (0.002%) than the control solution made of standard iron solution.
sodium
take 0.25g of this product, put it in 50ml measuring flask, dissolve it with water and dilute it to the scale, shake it well, take 20ml and put it in two 50ml measuring flasks respectively, add hydrochloric acid solution (1-2)10ml, dilute to the scale with water in one measuring flask, shake well, take 10ml precisely, put it in 50ml measuring flask, dilute to the scale with water, and use it as a test solution; add standard sodium chloride solution (NaO per 1 ml) to the other measuring flask. 1 mg )5ml, diluted with water to the scale, shake well, take a precise amount of 10ml, put in a 50ml measuring flask, diluted with water to the scale, as a control solution. According to Atomic Absorption Spectrophotometry (General rule 0406 second method), at the wavelength of 589mn determination, should comply with the provisions (0 arsenic salt take this product l .O g, add water 23ml to dissolve, add hydrochloric acid 5ml,
Inspection according to law (General Principles 0822 first law), shall comply with the provisions (0.0002%).
Heavy metals
take 2.0g of this product, add 12ml of dilute hydrochloric acid and 5ml of water, boil for 5 minutes, let cool, add 1 drop of phenolphthalein indicator solution, and add ammonia test solution Dropwise until the solution is pink, let cool, add 2ml of acetate buffer solution (pH 0821) and appropriate amount of water to make 25ml, and check according to law (General rule method 1), containing heavy metals shall not exceed 10 parts per million.
arsenic salt
take l.Og of this product, add 23ml of water to dissolve, add 5ml of hydrochloric acid, check according to law (General rule 0822 first law), should comply with the provisions (0.0002%).
Last Update：2022-01-01 11:28:24
POTASSIUM HYDROGEN CARBONATE - Content determination
Authoritative Data Verified Data
Take 2g of this product, precision weighing, add 100ml of water to dissolve, add 10 drops of Methyl red-bromocresol green mixed indicator solution, and use hydrochloric acid titration solution (l.O mol/L) titrate until the solution changes from green to purple, boil for 2 minutes, cool to room temperature, continue titration until the solution changes from green to dark purple, the titration results were corrected by blank test, and 1.0 of each ml hydrochloric acid titration solution (100 mol/L) was equivalent. KHC03 of lmg.
Last Update：2022-01-01 11:28:25
POTASSIUM HYDROGEN CARBONATE - Category
Authoritative Data Verified Data
pharmaceutical excipients, pH regulator, etc.
Last Update：2022-01-01 11:28:25
POTASSIUM HYDROGEN CARBONATE - Storage
Authoritative Data Verified Data
sealed storage.
Last Update：2022-01-01 11:28:25
POTASSIUM HYDROGEN CARBONATE - Reference Information
| pH indicator color change ph range | 8 - 9 |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| application | in recent years, food-grade potassium bicarbonate has been widely used as food loosening agent and quality improver, and its development has received more and more attention. Food-grade potassium bicarbonate is the raw material for the production of food-grade potassium carbonate. Food-grade potassium bicarbonate is widely used in chemical industry, light industry, picture tube glass bulb, pharmacy, food, welding electrode and non-ferrous metal metallurgy industries. |
| solubility in water (g/100ml) | dissolution grams per 100ml of water at different temperatures (℃): 22.5g/0 ℃;27.4g/10 ℃;33.7g/20 ℃;39.9g/30 ℃;47.5g/40 ℃ 65.6g/60 ℃ |
| identification test | potassium test (IT-27) and bicarbonate test (IT-6) of 10% sample solution were positive. |
| content analysis | accurately weigh about 4g of sample and dissolve in 100ml of water. Add 2 drops of methyl red test solution (TS-149) and slowly titrate with 1mol/L hydrochloric acid under continuous stirring until the solution becomes light pink. Heat the solution to boiling and cool, continue titrating until the pink does not disappear after boiling. Each mL1mol/L hydrochloric acid is equivalent to potassium bicarbonate 101mg. |
| toxicity | ADI does not make special regulations (FAO/WHO,2001). GRAS(FDA,§ 184.1613,2000). |
| usage limit | FAO/WHO(1984): low-power concentrated milk, sweet condensed milk and thin cream (2 g/kg alone, 3 g/kg combined with other stabilizers, based on anhydrous); Milk powder and thin cream powder 5 g/kg (based on anhydrous); cocoa powder and sugary cocoa powder, cocoa bean powder, cocoa liquid and cocoa oil cake, 5 g/kg (calculated by fat-free cocoa, calculated by K2CO3); Jam and jelly keep the Ph value at 2.8~3.5.GB 2760-1997: Mineral Beverage 0.033g/L; GMP for all kinds of foods requiring leavening agent; Milk and dairy products shall be implemented according to relevant regulations. |
| preparation | (1) take 5.0kg of lye wastewater with k concentration of 251.6mg/L (K2O),Na concentration of 180.0mg/L (Na2O),SiO32-concentration of 30.5mg/L (SiO2) and AlO2-concentration of 18.2mg/L (Al2O3). Under one atmospheric pressure (1.0atm,101.3kPa), CO2 gas is introduced to acidify the lye wastewater through magnetic stirring. When the pH value of the lye wastewater reaches 7.8-8.2, a white precipitate consisting of Si impurity precipitate and Al impurity precipitate appears, filtration, washing, discarding the white precipitate, and obtaining filtrate A;(2) The filtrate A adopts a normal pressure evaporation concentration process with an evaporation temperature of about 100 ℃, the density of filtrate A changes from 1.05g/cm3 to 1.28g/cm3. When the temperature reaches room temperature, the system crystallizes for 2.0h at room temperature, and a large number of white crystals appear, namely Na2CO3 crystals containing crystal water; Na2CO3 crystals containing crystal water and filtrate B are separated, Na2CO3 crystals containing crystal water are calcined at 300 ℃ for 2.0h, and Na2CO3 products (purity> 99.9%, to meet the requirements of analytical purity);(3) Place filtrate B in an autoclave, add high pressure CO2, control the pH value of filtrate B to 7.0, the equilibrium pressure P = 0.3MPa, and the crystallization time to 2.0h. At this time, crystal precipitation also occurs in the K-Na-HCO3-solution system. The analysis result shows that the crystal is KHCO3 xH2O(x = 0.5-1.0), and separate and wash with cold water to obtain refined KHCO3. (4) The K-Na-HCO3-solution obtained in the above step is further evaporated at 90 ℃ under normal pressure to obtain KHCO3 crystal hydrate as the crystal. KHCO3 crystal and filtrate C can also be obtained by filtration separation and cold water washing. (5) Combine the refined KHCO3 obtained in step 3 and step 4, and vacuum dry at 80 ℃ for 6h to obtain food grade KHCO3. (6) Mix the filtrate C with the washing liquid of steps 3 and 4 and add the next round of 5.0kg lye wastewater, repeat the above operation process, cycle five times, calculate the total amount of potassium in the product KHCO3 and 25.0kg of original wastewater lye, and the yield is 90.5%. |
| uses | used as raw materials for the production of potassium carbonate, potassium acetate, potassium arsenite, etc., and also used in industries such as medicine, food, fire extinguishing agent, etc. commonly used as analytical reagent used as acidity regulator and chemical leavening agent. according to the regulations of our country, it can be used in all kinds of foods requiring leavening agent, and it can be used appropriately according to production requirements. analytical reagents. Baking powder. Foamed salt. is the raw material for the production of potassium carbonate, potassium acetate, and potassium arsenite. Can be used as fire extinguishing agent for petroleum and chemicals. It can also be used in medicine and baking powder. |
| production method | potassium carbonate, the raw material of carbonization method, can be a tertiary product. It can also be used as raw material, which contains potassium carbonate 40% ~ 60%, potassium sulfate 10% ~ 15%, and potassium chloride 3.5%. Before feeding, organic matter needs to be removed by calcination, potassium sulfate and potassium chloride are removed by different solubility, and lime milk or magnesium carbonate can be added to remove impurities such as silicon, aluminum, and phosphorus. The filtrate is evaporated to prepare a potassium carbonate solution so that the total alkali concentration is 750~800g/L (based on potassium carbonate), into the carbonization tower. At a temperature above 50 ℃ and a reaction pressure of 0.4MPa, carbon dioxide (concentration above 30%) is passed and carbonized. Potassium bicarbonate is continuously precipitated with the increase of concentration. After carbonization for 5~6h, the mother liquor was crystallized, washed, centrifuged and dried at 80 ℃ to obtain the finished potassium bicarbonate product. Its K2CO3 CO2 H2O → 2KHCO3 ion exchange method potassium chloride solution is passed through the human ion exchange column through calcium removal and magnesium countercurrent, so that the sodium resin (R-Na) becomes potassium type (R-K). After washing the chloride ions with soft water, the ammonium bicarbonate solution flows downstream through the resin exchange column to obtain a mixed dilute solution of potassium bicarbonate and ammonium bicarbonate. After evaporation and decomposition, most of the solution is decomposed into potassium carbonate, and the solution is sent to a carbonization tower for carbonization to generate potassium bicarbonate, after crystallization, separation, washing and drying, the finished potassium bicarbonate product is obtained. Its R-Na + KCl → R-K + NaClR-K + NH4HCO3 → R-NH4 + KHCO32KHCO3 → K2CO3 + CO2 ↑ H2OK2CO3 + CO2 + H2O → 2KHCO3 products are prepared by absorbing carbon dioxide from 80% ethanol solution of potassium hydroxide or saturated solution of potassium carbonate. K2CO3+CO2+H2O→2KHCO3 |
Last Update：2024-04-09 15:16:49
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Raw Materials for POTASSIUM HYDROGEN CARBONATE
Downstream Products for POTASSIUM HYDROGEN CARBONATE