SU60105A1 - The method of cleaning the neutralized Zizka - Google Patents

Description

When the acetic acid-calcium salt is obtained directly from the liquor without distillation, when the acetic acid salt is obtained, when acid is removed from resinous products and similar processes, low-quality salts are obtained due to the ingress of significant amounts of contaminating organic impurities. as well as the inevitable excess of the reagent used for the neutralization (calcium oxide hydrate, soy, etc.).

The method proposed in accordance with the present invention is aimed at improving the quality of the salt by removing the bulk of the organic impurities, while at the same time removing from the base or carbonate of SALT used for neutralization.

The method is as follows.

The aqueous solution of the salt {separated or filtered) is slightly acidified before evaporation before the onset of the weakly acidic reaction by weak acetic acid straps resulting from its rectification and proceeding with either preparing the acetic sodium salt or again for extraction.

For acidification, weak solutions of acetic acid can also be used, which are obtained during the production of cellulose acetate, or acidic (distilled, distilled liquor), or finally, the liquor itself. After careful acidification, the salt solution is treated in a mixer or in a countercurrent extractor with a small amount (in a volume of 10-50% of the solution to be purified) with a solvent that is not miscible with water or slightly soluble in water and highly dissolving resinous contaminants.

Such solvents may be either chlorine derivatives of hydrocarbons (dichloroethane, trichlorethylene, etc.) or esters (butyl acetate, ethyl acetate) or ethers (sulfuric ether) OR ketones (low boiling fractions of ketone oils, etc.).

When processing liquids with such solvents, the content of phenols: it decreases in such sizes: when processing with ethyl acetate - by 75%, when processing with dichloroethane - by 78%, when processing with low boiling ketone oils (with

boiling point 85 -. 150) - “and 80%.

The content of all substances oxidizable with permanganate during the treatment with ethyl acetate decreases by 70%, and the content of furfural by 60%. In view of the almost neutral reaction, acetic acid will not be recovered.

Due to the fact that the salt solution is subsequently fed to the residue, the extraction of the solvent dissolved in a small amount will not require the expenditure of heat. Instead of contaminating the salts, the extracted substances can be used to isolate phenols from them, to obtain a lot of reagents, solvents and the like.

Exemption from these substances powder facilitates the cleaning of vinegar-1

60105

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acid and reduces the consumption of expensive oxidizing agents.

Pre | M: em inventions.

Claims (2)

1. A method for purifying a neutralized sludge using, for extracting from it resinous impurities that are not miscible with water, organic solvents, characterized in that the neutralized liquid is firstly acidified with diluted acetic acid in an amount necessary to remove excess neutralizing agent and to decompose the phenols, and then extracted with organic solvents. 2. A process according to claim 1, characterized in that chlorine derivatives of hydrocarbons, esters and ethers or ketanes are used for extraction.