Potassium carbonate
Potassium carbonate
CAS: 584-08-7
Molecular Formula: K2CO3
Potassium carbonate - Names and Identifiers
| Name | Potassium carbonate |
| Synonyms | K2CO3 Pearl ash Salt of tartar alt of wormwood Potassiumcarbonate Potassium carbonate Carbonate Of Potash dipotassiumcarbonate Dipotassium carbonate PotassiumCarbonateFcc Carbonicaciddipotassiumsalt Carbonicacid,dipotassiumsalt Potassium carbonate anhydrous Potassium carbonate,anhydrous PotassiumCarbonateAnhydrousAr Potassium carbonate hemihydrate Carbonic acid, dipotassium salt PotassiumCarbonateAnhydrousK2CO3 PotassiumCarbonatePurified(Anhydrous) |
| CAS | 584-08-7 |
| EINECS | 209-529-3 |
| InChI | InChI=1/CH2O3.2K.2H/c2-1(3)4;;;;/h(H2,2,3,4);;;;/p-2/rCH2O3.2HK/c2-1(3)4;;/h(H2,2,3,4);2*1H/p-2 |
Potassium carbonate - Physico-chemical Properties
| Molecular Formula | K2CO3 |
| Molar Mass | 138.21 |
| Density | 2.43 g/mL at 25 °C |
| Melting Point | 891 °C (lit.) |
| Boling Point | decomposes [STR93] |
| Water Solubility | 1120 g/L (20 ºC) |
| Solubility | Easily soluble in water, insoluble in ethanol and ether. |
| Appearance | White powder or granule |
| Specific Gravity | 2.29 |
| Color | Yellow |
| Maximum wavelength(λmax) | ['λ: 260 nm Amax: 0.03', , 'λ: 280 nm Amax: 0.02'] |
| Merck | 14,7619 |
| BRN | 4267587 |
| pKa | 10.33[at 20 ℃] |
| PH | 10.52(1 mM solution);11(10 mM solution);11.36(100 mM solution); |
| Storage Condition | Store at +5°C to +30°C. |
| Stability | Stable. Incompatible with moisture, acids, magnesium bromine trifluoride and magnesium bromine trichloride. |
| Sensitive | Hygroscopic |
| MDL | MFCD00011382 |
| Physical and Chemical Properties | Characteristics of monoclinic, white powder or fine granular crystal. melting point 891 ℃ relative density 2.428 solubility: soluble in water, insoluble in ethanol and ether. |
| Use | Used in glass, printing and dyeing, soap, enamel, preparation of potassium salt, ammonia decarbonylation, also used in color TV industry, mainly used in food as leavening agent |
Potassium carbonate - Risk and Safety
| Hazard Symbols | Xn - Harmful |
| Risk Codes | R22 - Harmful if swallowed R36/37/38 - Irritating to eyes, respiratory system and skin. R20/21/22 - Harmful by inhalation, in contact with skin and if swallowed. |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36 - Wear suitable protective clothing. S37/39 - Wear suitable gloves and eye/face protection |
| UN IDs | 3262 |
| WGK Germany | 1 |
| RTECS | TS7750000 |
| FLUKA BRAND F CODES | 3 |
| TSCA | Yes |
| HS Code | 28364000 |
| Packing Group | III |
| Toxicity | LD50 orally in rats: 1.87 g/kg, H. F. Smyth et al., Am. Ind. Hyg. Assoc. J. 30, 470 (1969) |
Potassium carbonate - Upstream Downstream Industry
Potassium carbonate - Reference
| Reference Show more | 1. [IF=2.817] Han Wei et al."Purification of spent electrolyte by sequential precipitation method and its on-line monitoring."Ionics. 2021 Nov;27(11):4829-4838 2. [IF=6.558] Changhao Bao et al."Simultaneous determination of aesculin and aesculetin and their interactions with DNA using carbon fiber microelectrode modified by Pt–Au bimetallic nanoparticles."Anal Chim Acta. 2022 Apr;1202:339664 |
Potassium carbonate - Nature
Open Data Verified Data
white granules or powder. Tasteless. Melting point 891 C; d 2. 29. Has a strong hygroscopicity, easy to agglomerate. Dissolved in 1 part of cold water, 0.7 parts of boiling water, the solution is strong alkaline, ph 11.6. Insoluble in ethanol, ether. When exposed to acid, carbon dioxide is released. Long-term exposure to air, easy to absorb carbon dioxide, into potassium bicarbonate.
Last Update：2024-01-02 23:10:35
Potassium carbonate - Preparation Method
Open Data Verified Data
- electrolysis method: a potassium hydroxide solution obtained after electrolysis of potassium chloride was carbonized with carbon dioxide in a carbide tower. The potassium bicarbonate was obtained by evaporation, filtration and calcination.
- ion exchange method: the cation exchange resin is exchanged with potassium chloride, and then the ammonium bicarbonate is eluted to form a dilute solution of potassium bicarbonate, which is subjected to multiple effect evaporation, carbonization, crystallization, separation and calcination.
Last Update：2022-01-01 09:02:33
Potassium carbonate - Introduction
Potassium carbonate is mainly used to make potassium glass, potassium and other inorganic chemicals, as well as hydrogen sulfide and carbon dioxide used to remove industrial gases. It is also used in welding electrodes, ink manufacturing, printing and dyeing industries, etc. Pure product contains k2o,68.12%, high thermal stability, and does not decompose above 1000 ℃.
Last Update：2022-10-16 17:26:39
Potassium carbonate - Use
Open Data Verified Data
Analytical reagents. Is a flux for molten silicates and insoluble sulfates.
Last Update：2022-01-01 09:02:33
Potassium carbonate - Safety
Open Data Verified Data
rat oral LDso:1870mg/kg. On the respiratory tract, eyes, skin has a stimulating effect, a large number of intake of the digestive tract is corrosive, and even cause death. Staff should be well protected, if accidentally touch the eyes, should immediately rinse with a large amount of flowing water. The working environment should have good ventilation conditions. Store in a cool, dry, well-ventilated warehouse. Packaging must be sealed intact. To prevent moisture. Should be stored separately from acids, damp items, etc.
Last Update：2022-01-01 09:02:34
Potassium carbonate - Reference Information
Open Data Unverified Data
| NIST chemical information | information provided by: webbook.nist.gov (external link) |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Overview | Potassium carbonate (chemical formula: K2CO3, English Potassium carbonate) also known as potash, the appearance of colorless crystals or white particles, very soluble in water, the solution is strongly alkaline. Cooling its saturated aqueous solution, there is a glass-like monoclinic crystal hydrate 2K 2Co3 · 3H2O Crystal separation, density of 2.043, at 100 deg C to lose water of crystallization. Insoluble in ethanol, acetone and ether. Strong hygroscopicity, exposure to air can absorb carbon dioxide and moisture, into potassium bicarbonate. It can be obtained by reacting potassium hydroxide with carbon dioxide. It can also be obtained by co-heating potassium chloride with magnesium carbonate, water and carbon dioxide under pressure, or by impregnation of Tung seed ash and plant ash. Mainly used for synthesis gas decarburization, electron tube, glass, enamel, printing and dyeing, electrode, film development, inorganic salt and picture tube glass shell of raw materials, impure potassium carbonate common name grass alkali, Tung alkali or bead Ash, one of the early varieties of potassium fertilizer. |
| reference quality standard | project top grade first grade qualified product type II potassium carbonate (K2CO3) content ≥ 99.0% 98.5% 96.0% 99.0% chloride (calculated by KCl) ≤ 0.01% 0.10% 0.20% 0.03% sulfur compound (calculated by K2SO4) ≤ 0.01% 0.10% 0.15% 0.04% iron (Fe) content ≤ 0.001%, 0.003%, 0.010%, 0.001% water-insoluble content ≤ 0.02%, 0.05%, 0.10%, 0.04% combustion loss ≤ 0.60%, 1.00%, 1.00%, 0.80% |
| content analysis | in a weighed weighing bottle with a plug, 1g of a dried sample obtained by the "loss on drying" method was precisely weighed and dissolved in 50ml of water. After adding 2 drops of Methyl red test solution (TS-149), the solution was titrated slowly with 1mol/L hydrochloric acid under constant stirring until the solution became pale pink. The solution was heated to boiling and cooled, and titration was continued until the pale pink color did not disappear after boiling. Each Ml of 1mol/L hydrochloric acid corresponds to 69.10mg of potassium carbonate (K2CO3). |
| solubility of potassium carbonate in water | maximum dissolved grams per 100g of water at different temperatures (℃): 107g/0 °c; 109g/10 °c; 111g/20 °c; 114g/30 °c; 117g/40 °c; 126g/60 °c; 139g/80 °c; 156g/100 °c. |
| toxicity | ADI is not specified (FAO/WHO,2001). LD50 18.70mg/kg (rat, oral). GRAS(FDA,§ 184.1619,2000). |
| Use limit | GB 2760-2001: pasta products, beverages, processing aids, GMP is limited. FAO/WHO(1984): Low-power concentrated milk, sweetened condensed milk, cream (2g/kg alone, 3g/kg combined with other stabilizers, based on Anhydrous); Milk powder, cream powder 5g/kg (based on Anhydrous); Jam and jelly, orange peel jelly (to maintain the pH value of 2.8~3.5); Infant formula (according to GMP); chocolate 50g/kg (by the cocoa beans, cocoa beans, cocoa liquid, cocoa cake, etc. into the part); Cocoa powder and sugar cocoa powder, cocoa beans, cocoa liquor and cocoa cake 5g/kg (calculated as non-fat cocoa and K2CO3, used in the manufacture of cocoa and chocolate products). |
| four production methods | the plant ash method is the oldest method, namely from various plant hulls (e. G, tea shells, Tung shells, sunflower shells) were extracted from the burned plant ash. Plant ash contains potassium carbonate, potassium sulfate, potassium chloride and other soluble salts, which can be separated by leaching, evaporation and crystallization. This method is rarely used because of low product quality, uneconomical, and limited by the source of raw materials. The lublan method is to mix potassium sulfate with coal powder and lime, and reduce roasting to obtain black ash (containing potassium carbonate, calcium sulfide and other sintered materials). After leaching, filtering, evaporation and carbonization, potassium bicarbonate is obtained, the product is then filtered and calcined. This method has been replaced by other methods due to the long process flow and so on. In the electrolysis method, the potassium hydroxide solution obtained after the electrolysis of potassium chloride is carbonized with carbon dioxide in a carbide tower. After multiple effect evaporator evaporation, filtered potassium bicarbonate, and then calcined to produce products. This method is widely used because of the availability of raw materials, high utilization rate of potassium and no three wastes, but it consumes more electricity. Ion exchange is the exchange of potassium chloride with a cation exchange resin. Then ammonium bicarbonate is eluted into dilute solution of potassium bicarbonate, and the product is obtained by multi-effect evaporation, carbonization, crystallization, separation and calcination. This method has good product quality, short process flow and is suitable for small-scale production. |
| Use | used in glass, printing and dyeing, making soap, enamel, preparation of potassium salt, pharmaceutical, etc., used as gas adsorbent, dry powder fire extinguishing agent, rubber antioxidant and the like is used for the rinsing process of the exposed photosensitive material. It is mainly used for the manufacture of picture tube glass shell in electronic industry, decarburization in chemical fertilizer production and potassium salt production It is used as analytical reagent, flux, and also used for the preparation of various potassium salts used for analytical reagent, reference Reagent and flux of molten silicate and insoluble sulfate used as food additive can be used as leavening agent in food; Can also be used for glass, printing and dyeing, soap, enamel, preparation of potassium salt, decarbonylation of synthetic ammonia is also used in the color television industry. used in glass, printing and dyeing, soap, enamel, preparation of potassium salt, synthetic ammonia decarbonylation, also used in color television industry, mainly used in food as leavening agent analysis reagent. High purity analysis. Emission spectrum analysis. Flux for silicates and insoluble sulfates. Water-absorbing agent for organic liquids. Electroplating. Chemical fertilizer. For photography. It is used as an alkaline agent and dough improver, and can inhibit the acid of noodles. It can be used in flour food and used in an appropriate amount according to the production needs. for the production of optical glass, glass transparency, strength and refractive index can be improved. Also used in the production of welding electrode, can prevent the phenomenon of arc breaking during welding. For the production of vat dyes and its dyeing and ice dyeing white. It is used as an adsorbent for the removal of hydrogen sulfide and carbon dioxide. Mixed with soda ash can be used as a dry powder extinguishing agent. It can also be used as auxiliary raw materials for acetone, alcohol production and antioxidant in rubber production. The aqueous solution can be used for cooking cotton and degreasing wool. In addition, it is also used in the production of ink, photographic medicine, polyester, medicine, electroplating, leather making, ceramics, building materials, Crystal, potassium soap and medicine. Heavy potassium carbonate is mainly used as the raw material of the picture tube glass shell, and is widely used in glass and special glass raw materials for decarburization of large chemical fertilizer. |
| production method | ion exchange method potassium chloride was prepared as a 250g/L solution, and a small amount of potassium carbonate was added to remove calcium and magnesium ions. Ammonium bicarbonate was also prepared as a 200g/L solution with water. The potassium chloride solution is passed into the ion exchange column in Countercurrent, so that R-Na of the sodium-type resin is changed into R-K of the potassium-type resin. The residual chloride ions in the resin gap are washed with soft water, the resin is changed to ammonium type R-NH4 to obtain a mixed dilute solution of potassium bicarbonate and ammonium bicarbonate. After one evaporation, the ammonium bicarbonate is decomposed, and then the potassium bicarbonate is decomposed into potassium carbonate by the second evaporation, the crystals of potassium chloride precipitated by cooling were removed by filtration and then three times evaporated to 54 ° Bé by filtration to remove the potassium-sodium double salt. The solution is carbonized to make potassium carbonate into potassium bicarbonate, and then crystallized, separated, washed with water and calcined to obtain a finished product. Potassium chloride is dissolved by R-Na + KCl → R-K + NaClR-K + NH4HCO3 → R-NH4 + KHCO32KHCO3 → K2CO3 + CO2 ++ H2O electrolysis, with the concentration of 270~300g/L, add an appropriate amount of potassium carbonate and potassium hydroxide to remove calcium and magnesium ions, after the solution is clear, adjust to pH 8~10 with hydrochloric acid, at a cell voltage of 2.8~3.5V, the potassium hydroxide solution with a concentration of 10% to 15% is obtained by electrolysis at a bath temperature of 60 to 70 ° C., and when the potassium hydroxide concentration is concentrated to 50% by evaporation, the solution is cooled to 30 to 35 ° C., and the precipitated potassium chloride is recovered and reused. Dilute the concentrated alkali solution to about 44%, and perform pre-carbonization. When the potassium hydroxide reaches below 30g/L, filter to remove the magnesium hydroxide precipitate, then concentrate to remove sodium, and then perform carbonization to obtain crude potassium carbonate, potassium bicarbonate crystals were obtained by continuous carbonization, and the crystals were washed with water, centrifuged and calcined to obtain refined potassium carbonate product. The 2KCl + 2H2O [electrolysis] → 2KOH + Cl2 ++ H2 + 2KOH + CO2 → K2CO3 + H2OK2CO3 + CO2 → 2KHCO32KHCO3 → K2CO3 + CO2 ++ H2O plant ash method mainly uses a variety plant shells, such as Tung shells, cottonseed shells, tea shells and sunflower shells, fired into plant ash, plant ash is a mixture of potassium carbonate, potassium sulfate, potassium chloride. They were separated by leaching, evaporation and crystallization. There are many kinds of purification methods, or add magnesium carbonate phosphorus removal, or into the carbon dioxide pre-carbonization impurity removal. Or add lime milk phosphorus removal, aluminum, silicon and so on. After secondary evaporation, cooling, separation, and then dried to produce potassium carbonate products. Limited by the source of raw materials, this method is not suitable for large-scale production, has been eliminated. The potassium sulfate, coal powder and limestone are mixed according to a certain ratio by the lublan method, and water is added to stir. The potassium chloride is controlled at 6%~ 8%, the sodium salt is controlled at 8%~ 10%, and then calcined at 900~1000 ℃ to obtain black ash. The black ash was pulverized, leached with hot water, and the leaching solution was evaporated to precipitate part of the unconverted potassium sulfate. After separation, the clear liquid was sent to the carbonizing tower for pre-carbonization. The carbonized liquid is added with potassium permanganate to precipitate impurities such as aluminum, silicon and iron, and the filtrate is evaporated to precipitate potassium carbonate, sodium double salt and impurities. The clear liquid is subjected to secondary carbonization to obtain crude potassium carbonate crystals, which are then filtered, the mixture was washed with water and then calcined in a calciner at 500-600 °c to form a potassium carbonate product. Its K2SO4 + 2C + CaCO3 → K2CO3 + CaS +2CO2 ↑k2co3 + CO2 + H2O → 2KHCO32KHCO3 → K2CO3 + CO2 ++ H2O 1 potassium chloride solution refined by ion exchange method (250g/L) it was adsorbed through a cationic resin (732) column and washed with distilled water until no chloride ions eluted. It is then eluted with 200g/L of ammonium bicarbonate until the potassium ion in the effluent is below 2G/L. Heat the eluent to 150 ℃, concentrate the solution to a relative density of about 1.593, and then inject CO2 gas for carbonization to precipitate potassium bicarbonate crystals, after centrifugation, potassium bicarbonate was decomposed into potassium carbonate by hot air at about 400 °c. KCl + NH4HCO3 → KHCO3 + NH4Cl2KHCO3 → K2CO3 + CO2 ++ H2O · 2 electrolysis potassium chloride dissolved in water (280g/L), Then, appropriate amount of potassium carbonate and potassium hydroxide was added to the refining tank to remove Ca2 + and Mg2 +. After clarification, the pH value was adjusted to 8-10 with hydrochloric acid and sent to the diaphragm electrolytic tank for electrolysis. The cell voltage is 2.8~3.5V and the cell temperature is 60~70 ℃. The content of KOH in the electrolyte is 10% ~ 15%, and it is concentrated to 50% by evaporation, cooled to 30~50 ℃, and KCL is precipitated to separate the potassium chloride solution, and the solution is pre-carbonized, when the KOH concentration was below 30g/L, the Fe(OH)3 precipitate was removed by filtration. Then, concentration was continued to 50%, and secondary carbonization was performed to precipitate potassium bicarbonate. After separation at 300 deg C hot air drying (decomposition) to obtain potassium carbonate. Food grade potassium carbonate also requires the above-mentioned industrial products to be dissolved in water, and a reducing agent is added to remove heavy metals and arsenic. After concentration, crystallization, centrifugation, drying and grinding, food grade potassium carbonate was obtained. 2KCl + 2H2O → 2KOH + Cl2 ++ H2 ++ KOH + CO2 → KHCO32KHCO3 → K2CO3 + CO2 ++ H2O +3 plant ash method utilizes various plant fruit shells (such as cotton seed shells, tea seed shells, sunflower seed shell, etc.), calcined into plant ash, its main components are potassium carbonate, potassium sulfate and potassium chloride. Firstly, warm water is used to dissolve and extract, and a small amount of lime milk is added to the extract, filtered, clarified and evaporated to a relative density of 1.318, cooled, crystallized and filtered to remove potassium sulfate. Concentration of the mother liquor to a relative density of 1.526, The crystals were cooled and filtered to remove potassium chloride. The mother liquor was concentrated until only crystals were precipitated, the crystals were cooled and filtered to obtain potassium carbonate. It can also be completely dissolved with water, into the CO2 gas, so that all the potassium carbonate into potassium bicarbonate crystal precipitation, potassium bicarbonate calcined potassium carbonate. 2KHCO3 → K2CO3 + CO2 ++ H2O recrystallization industrial grade potassium carbonate was dissolved in distilled water, solution purification, filtration to remove impurities, the filtrate was concentrated by evaporation, cooling crystallization, centrifugal separation, drying, preparation of anhydrous potassium carbonate product. |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-09 19:43:38
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View History
Potassium carbonate
(2R)-2-(2,4-dichlorophenoxy)propanoic acid
7-ACETY BACCATIN三期
4-Trifluoromethyl benzoyl chloride
O-CHLOROBENZOIC ACID METHYL ESTER
Methyl 1-Boc-4-aMinoMethylpiperidine-4-carboxylate
FEMA 2436
Escholine chloride
1-环丙基-4-苯氧基苯
12-OXYSTEARIC ACID SODIUM SALT
(2R)-2-(2,4-dichlorophenoxy)propanoic acid
7-ACETY BACCATIN三期
4-Trifluoromethyl benzoyl chloride
O-CHLOROBENZOIC ACID METHYL ESTER
Methyl 1-Boc-4-aMinoMethylpiperidine-4-carboxylate
FEMA 2436
Escholine chloride
1-环丙基-4-苯氧基苯
12-OXYSTEARIC ACID SODIUM SALT
Raw Materials for Potassium carbonate
Downstream Products for Potassium carbonate
Potassium chloride
Potassium Phosphate Monobasic
Potassium hydrogen phosphate anhydrous
Potassium hexacyanoferrate
Potassium fluoride
Potassium hexafluorotitanate
Potassium bromide
Potassium Phosphate Monobasic
Potassium hydrogen phosphate anhydrous
Potassium hexacyanoferrate
Potassium fluoride
Potassium hexafluorotitanate
Potassium bromide