SU93300A1 - Method of separating sodium sulfate from acetone solution of diacetone-sorbose - Google Patents

Description

The known method of separation by filtering the sulphate salts formed during the neutralization process in the acetonation phase of sorbose has a number of significant drawbacks:

1. Under the conditions of technology, the neutralization of sulfuric acid with sodium alkali should take place at the lowest possible temperature (minus 7-3 °), as a result of which sodium sulphate is released as a crystalline hydrate.

In a cold acetone solution, this precipitate has a gelatinous character and is extremely slowly filtered through dense tissue or passes through more rare. The difficulty of filtration is aggravated by the fact that the solution is alkaline.

2.AcetoN is a very volatile substance and during long-term filtration, especially on vacuum filters, a large amount of it escapes.

3. After filtering and washing the precipitate with fresh acetone, a significant amount of acetone remains in the precipitate. In order to overcome the precipitate, it is necessary to create a large pressure, where the crystalline hydrate is destroyed, and the water saturated with sodium sulfate enters the acetone solution.

In the proposed method of separating sodium sulfate from acetone solutions of diacetone-sorbose, the ability of sodium sulfate hydrate decomposes into anhydrous sodium sulfate and its saturated aqueous solution when heated. The method allows to increase the yield of crystalline diacetone sorbose and reduces the consumption of acetone by 40%.

In the inventive method, an acetone solution of diacetone adsorbose containing crystalline sodium sulfate hydrate is heated above the decomposition temperature of the crystalline hydrate, and the resulting acetone solution is separated by decantation.

The proposed method is carried out as follows.

The acetone solution of the bottom aceton sorbose together with the salts goes into a closed apparatus, where it is settled for an hour. Then, the upper transparent layer containing sodium sulfate is decanted, and the remaining mixture of acetone solution and crystalline sodium sulfate hydrate is heated to 34 °. At this temperature, the crystalline hydrate of Na2SO4-IOH20 melts, anhydrous Na2SO4 and its saturated solution is released. This saturated solution pushes acetone along the surface along with the diacetone adsorphosis dissolved in it. The acetone layer is decanted a second time, and the sulphate solution and anhydrous salt, in which the residue of acetone constitutes one-tenth of a percent, is discharged from the apparatus.

If neutralization with potassium alkali and the precipitate does not constitute a crystalline hydrate, after separation of the sediment, the bulk of the filtrate’s main

The remaining precipitate, hot water, is added to dissolve part of the salts and create a layer of saturated potassium sulphate solution, which, like sodium sulphate solution, will add acetone and diacetone adsorbose to the surface.

Subject invention

A method of separating sodium sulphate from an acetone solution of diacetone-sorbose, wherein the acetone solution is a diacetonor. Bose containing crystalline sodium sulfate hydrate is heated beyond the decomposition temperature of the crystalline hydrate, and the resulting acetone solution is separated by decantation.