DE330944C - Process for the production of Glauber's salt from bisulfate and common salt - Google Patents

Description

Process for the production of Glauber's salt from bisuifate and table salt. It is known from the manufacture of nitric acid from sodium nitrate and other chemical processes falling away sodium bisulfate the more valuable Glauber's salt and hydrochloric acid to produce after the following reaction Na H S 04 - ¢ - Na C, = Nag S 04 - {- H Cl. The known method is carried out in such a way that bisulfate beef table salt dry ground together and heated in muffles. Though the reaction takes place at a relatively low temperature, their execution is owing the use of gas-tight muffles cumbersome and expensive. On the other hand is - it already known bisulphate for the purpose of representing sulfuric acid and sulphurous To split acid thermally in the melt flow. In the present invention finds on the other hand a chemical decomposition of bisulphate and common salt with interaction instead, whereby hydrochloric acid is released. The novelty and essence of the present invention lies in the fact that the aforementioned reaction between bisulfate and table salt is carried out in the molten state. Although now the use of table salt in the melt flow at first sight an essential one as a result of the attack on the masonry Difficulty appears to result from the implementation of the reaction significant advantages in melt flow.

The reaction is much more complete and faster, the costs are significantly reduced. Above all, it is possible in this way to process large quantities, for example, directly in the Siemens-Martin furnace, all at once and even if desired to process continuously. While when working in closed muffles the Reaction mass is completely inaccessible and its state becomes uncontrollable When working in the melt pool, it is possible to precisely control the course of the reaction and, for example, by adding bisulfate or common salt or blowing through superheated steam.

Furthermore, all impurities when heated in muffles of table salt and bisulphate remain in the product, settle when working in the melt flow the impurities are partly removed, and partly they can be removed by appropriate Measures - for example adding lime, blowing air through, etc. - for elimination are forced.

While you are finally forced to work in muffles, the material Allowing the muffles to cool down before emptying them can be done when working after the present process the completely purified Glauber's salt either in forms pour or using its heat in a known manner in crystallized, Glauber's salt containing water of crystallization or finely divided water of crystallization free from water convict.

The procedure is advantageously carried out in such a way that that you first create a molten bath of table salt or Glauber's salt. Would namely, make an attempt to first create a molten bath of bisulfate to produce, so great losses would occur and the decomposition products of the Bisulphate to contamination of the apparatus and_ @ .to ..attacking the furnace material to lead. In 'this weld pool the prepared ".ar' @ '$ gi are removed by hand Samples entered certain amounts of bisulfate and common salt, if necessary the reaction is completed by blowing in superheated steam and if necessary causes a cleaning of the melt. The finished melt is then drained off and processed into the desired creditor salt products. -The cleaning of the melt occurs to a large extent when the impurities simply settle out leaves. This settling is promoted if you let air through the melt for some time blows and thereby oxidizes the contamination.

The blowing through of steam also has a considerable influence on the purity of the product, which can be explained by the effect of the water vapor the product becomes weakly alkaline: '. Weakly alkaline melts experience has shown that they better settle their impurities.

The weak alkalinity can also be achieved by adding lime or barite and at the same time let gypsum fall out, which carries away impurities.

It is also advantageous to add a little soda or baking soda to bring about the weakness of the melt.

To remove the unavoidable traces of the escaping gases containing hydrochloric acid to rid of hydrogen sulfide, sulfuric acid and sulphurous acid, conducts they are advantageously used over table salt, which binds the sulfur compound and the corresponding amounts of hydrochloric acid are released. This is done appropriately at a higher temperature and most advantageously so that one de cleaning of the exhaust gases with the preheating of the table salt required for the next batch.

The processing of the melt on the finished product can be carried out in any Way. It is particularly advantageous to stir the melt continuously to let cool, which immediately produces finely divided calcined sulphate receives.

Finely divided calcined sulphate is obtained with constant stirring at normal or slightly elevated temperature with appropriate amounts of water sprinkled, then one immediately gets crystallized by heating and cooling again Glauber's salt with 10 percent water in small crystals. One omits in the end stirring and adding a little more water gives large crystals.

Claims (1)

PATENT CLAIMS: i. Process for the production of Glauber's salt Bisulfate and common salt, characterized in that -the conversion of bisulfate and Table salt takes place in hot melt flow, -2. . Embodiment of the method according to claim r, characterized in that before the introduction of the bisulfate a Melt bath of table salt or Glauber's salt is generated. 3. Embodiment of the method according to claim z and 2, characterized by the blowing in of air. 4th embodiment of the method according to claims i to 3, characterized. by blowing in steam. 5. Embodiment of the method according to claim i to 4, characterized by an addition small amounts of lime or barite. 6. embodiment of the method according to claim i to 5, characterized by the addition of a little soda or caustic soda. Embodiment of the method according to claim r to 6; characterized by cooling the hot liquid Schipelze with constant stirring. $ .. embodiment of the method according to claim x to 7,: characterized,. that the hydrochloric acid gases over before absorption Brush salt, whereby. they lose their content of sulfur compounds and preheat the table salt. -.