PL10948B1 - Method of obtaining potassium carbonate. - Google Patents

Description

It is known that the factory production of potassium carbonate by potassium potassium carbonate carbamate is impossible. the long method of Solvay, i.e. by introducing CO2 and NHS as gases or dissolving ammonia and carbonic acid into the formation, is known to obtain a mixture of potassium chloride solution. Due to ammonium carbamate nine and amo carbonate relatively easy to form solubility. The presence of a large amount of water in KHC03 compared to gases, a relatively dilute solution of po NH4HCOs, the equilibrium state already suppresses the formation of carbonate, while counter- with a low content of NH4Cl in the solution, no carbamate is obtained from carbonate along with many KCL Separation of the two by dehydrating agents how the salt concentration is - although it is possible too difficult for a solution of NHS, K2COz, etc., to produce a smooth fabrication. Furthermore, ammonium carbamate and chloride. The invention relates to the preparation of the ammonium vapor is very soluble in anhydrous or a little water containing liquid ammonium chloride, while potassium chloride and, to an even greater extent, potassium carbamate are sparingly soluble therein. transforms the solid potassium salt, eg KCl, from the salt formed. If KCO 2 NH 2 is added to a small amount of water and heated, NH 3 or NH 3 and CO 21 are released and KHCO 3 or K 2 CO remain? or a mixture of both. The decomposition already takes place at a relatively low temperature (below 100 °). 2 KCO 2 NH 2 + H 2 O = K 2 CO 3 + 2 NH 3 + CO 2. By carrying out this method, ammonium carbamate can be obtained so that Q 2 is introduced into a water solution of a- monjak, the solution is then cooled, and the crystallized salt is separated by suction under pressure. The solution is saturated again with ammonia and again CO 2 is introduced. This salt is mixed with solid KCl in liquid ammonia. Instead of the salt thus obtained, it is possible to use NH 3 and CO 2 in the usual methods, the formed salts, e.g. ammonium carbonate or CO 2, can be introduced directly into the liquid ammonia. The conversion takes place independently of temperature and pressure, so that it is possible to work under the usual pressure and If the temperature is sufficiently low, the NH3 is liquid or at a higher temperature and the appropriate pressure. Potassium salt can also be used in solution, especially when using solvents that do not adversely affect the solubility of the carbamate in the remaining fluid. with NH3 and CO2, mixed with anhydrous or a little water containing liquid ammonium acid, so that solid potassium carbamate KC02 NH2f is released when NHfil remains in the solution alongside small amounts of KC02 NH2. After the conversion is completed, a sediment is separated from the liquid, consisting of with potassium carbamate and possibly excess carbamate and washed with liquid ammonia. The washing fluid is used in new reactions to make the process run continuously. The separated and washed potassium carbamate is made with a small amount of water and heated, because depending on the temperature, NH3 or NH3 and C021 are released, which returns to fabrication. thus KHCO3 or K2CO3 represents the end product. The separated liquid is a solution of NH4Cl and NH4 CO2 NH2 along with small amounts of KCO2 NH2 in liquid ammonia. suitable pressure, or by lowering the pressure and recompressing in conjunction with cooling. The remainder warms up, as a small amount of KCO2NH2 present there converts from NH4Cl to KCl and NH4CO2 NH2. With further heating, NH4CO2 NH2 decomposes into CO2 and NH31 which go back to fabrication. NH4CO2NH2 = 2NH3 + CO2. The residue thus obtained is NHL CO & NHz + KCl = KCO2 NH * + NHL Cl. solid solid solid dissolved - 2 - consists of NHA Cl and a small amount of KCl. Water is harvested and treated by known methods with slaked lime in appropriate apparatus in order to obtain NH3, which is returned to the fabrication. The new method gives astonishing yields; approximately 100% of potassium can be produced, based on the potassium salt consumed. PL

Claims (6)

Patent claims. 1. The method of obtaining potassium carbonate, characterized by the fact that the potassium salt (e.g., potassium chloride) is usually in a solid state subjected to the action of ammonium carbamate, ammonium carbonate in a liquid (anhydrous or a little water containing) ammonia. or other combinations of ammonia with carbonic acid, for which the potassium carbamate thus obtained is converted into acid carbonate or potassium carbonate in a known manner. 2. Method for the preparation of potassium carbonate, characterized by the fact that the potassium salt (e.g., potassium chloride) is best solidified into a liquid ammonia (anhydrous or low in water), simultaneously introducing carbonic acid, and the resulting carbamate is then formed potassium is converted into acid carbonate or potassium carbonate in a known manner, 3., An implementation form of the method according to claims 1 and 2, characterized by the fact that after the reaction is finished, the released components: ammonia and carbonic acid are consumed simultaneously with acidic carbonate or potassium carbonate: the method according to claims 1 and 2. and 4. An embodiment of the method according to claims 1 and 2, characterized in that it distills the liquid ammonia contained in the liquid separated from the potassium carbamate to re-enter the fabrication, turning it back into a liquid. 5. A method according to claims 1, 2 and 4, characterized by heating the salt remaining from the separated liquid after recovering the liquid ammonium hydroxide in order to decompose the ammonium carbamate contained therein into a monoacid and carbonic acid, which goes back into fabrication. 6. The method according to claims 1, 2, 4 and 5, characterized by treating the salt remaining after heating under claim 5 with lime milk, a known method in an ammonia drainage apparatus, in order to recover and bring back for the fabrication of the ammonia contained therein. Kali-Industrie Aktiengesellschaft. Carl Theodor Thorssell. August Kristensson, Deputy: Dr. inz, M, Kryzan, patent attorney. Print by L. Boguslawski, Warsaw. PL