DE1492916A1 - Process for removing potassium from industrial by-products - Google Patents

Description

Poetecheck: Münohen No. 47 382 Bank: Deutsche Bank No. 6BO5O6 Mortgage bank Stachue No. 28OO

H92916

Ci3b ^ MUNICH 27 Sohumannetr. 2 - Telephone: 40 81 47 Teleoram: Potentwedde - Munich

Soclfete Fives Lille - Call

7, Rue Montallνet, Paris Öme, France

THE PURE PROCESS OF SEPARATING POTASSIUM FROM INDUSTRIAL BY-PRODUCTS

The "present" invention relates to a method for excreting vott laliuesalaen, the dissolved in ZiwtMBd in all cases of lifting products available • Sad. The · «· Terfahrem l» tprtellhaft, if e · allowed.

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Mebenprodufct « mttmmut m. Die« is ln ^ eeoedere der «1 Mf ·» 9 «« r D «# Ull ** i« a «» ohl «« 3> en, dl «#t« rtc «tt ■ M« > ltt "- 'ulillilfcai substance" η

H92916 I.

and contain large amounts of sodium and potassium salts; whose main and practically only industrial use is processing into fertilizer. After All or part of the potassium salts can be eliminated advantageously by these yeast and distillation by-products for example used in the production of fodder.

In order to separate potassium salts from these products, it has been proposed to add sulfuric acid or a sulphate in sufficient quantity to achieve a potassium sulphate precipitate which is then separated out of the solution by filtering or centrifugation. This precipitate, which, however, consists of very small crystals, is difficult to filter out or centrifuge, so that the potassium salts can only be separated off with an energy expenditure which is in no relation to the profit, as it is due to the increase in the market value of these products through the elimination of these Salts can be achieved

The object of the present invention is to improve this process using large crystals of potassium sulfate su achieve, which are easy to separate for example by centrifuging.

- 2 909841/0582

BAD OWGiNAL

The characteristic of the process according to the invention result from the following description of an embodiment of this process for the treatment of yeast-making beverages.

The different procedural steps are as follows:

1.) The remaining solutions are concentrated to a concentration of approximately 45 gK ₂ 0 / l.

2.) The solutions are either replaced by sulfuric acid or sulfated by a base and sulfuric acid or by the sulfate of this base.

In the case of Heferel Schlempen, it is recommended that Carry out sulphation by adding ammonium sulphate, as the addition of sulfuric acid only produces an end product that is too acidic. The addition of baking soda makes one Increase in the sodium content of the depleted vinasse, which is often with regard to the use of this By-products not wanted 1st.

The amount of sulfuric acid or sulfate added to the solutions must be quite small in order for it to be no precipitate forms during this process.

909841/0582

BATH

2.) That present in the sulfated solution Potassium sulfate is crystallized by concentration in vacuo and cooling.

Since these solutions often contain a lot of sodium, _{the crystallization problem of the K 2} SO _{21 in} these solutions can be traced back to the crystallization in the KgSO ^ - Na ₂ SO ^ - HpO system, in that the solubility of the N ₃ SO ₁₊ increases when the The temperature decreases, while the solubility of the KgSO ^ increases with the temperature, which allows KgSO ^ crystals of great purity to be obtained at the end of the crystallization.

To make large crystals «which are easily separated from the nut solution (stillage freed from potassium) can «the crystallization is carried out in a non-continuously working crystallizer« of this Construction allows good stirring of the liquid during crystallization «in the following ways:

a) A small amount of the solution is first concentrated to a content of 75 to ϋθ g KgO / l «by one "Krlstalllsatlonsmasse" to form.

b) The crystal formation is started by shaking.

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BATH ORIGINAL

c) The "Krlstallisatlonsma3se" is with the 45 g p containing sulfated solution charged, wherein the vacuum evaporation of the product during the crystal

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lization is continued. The feed is adjusted so that the product maintains an appropriate KpO concentration .

4.) The product is finally concentrated until it reaches the desired dry matter content; in the case of yeast brews to about 75 % *

5.) The product is cooled down to about 35 ° C, which corresponds to the minimum solubility of KgSO ^ in the presence of

6.) The potassium sulfate crystals are separated off by centrifugation.

Experience has shown that in such a process in yeast-brewing stillages the KgO content of 16% by weight, calculated on the dry matter, can be reduced to 2 % and less.

909841/0502

bad cm \ Q \ _{n / KL}

Claims (3)

Patent claims: 1.) A method for separating KalumsaLzen from yeast or distillation vinasse by adding sulfuric acid or a sulfate to the solution to be treated and by separating the Kai Lumsulfat formed by filtering or centrifugation, characterized in that the i * chwe fei acid or sulfate amount , which is added to the solution, is selected depending on the potassium concentration of the solution so that no potassium sulfate precipitate occurs during the sulfation reaction and that after this reaction a small amount of the solution is concentrated in a crystallizer and the crystals thus formed regularly by gradually introducing the residue The solution in the crystallizer can be enlarged by maintaining an appropriate concentration of the solution. 2.) The method according to claim 1, characterized in that the solution is concentrated and cooled after crystallization. 3. The method according to claim 1 or 2, characterized in that deJ is used for the separation of the potassium ammonium sulfate. - 6 -909841/0582 BATH ORIGINAL