SU10361A1 - The method of purification from resinous impurities of the podsmolnogo water, technical calcium acetate (powder) and technical sodium acetate - Google Patents

Description

The podsmolny water formed during dry distillation of wood serves as a source for the production of acetic or gray powder, which is the basic material for the production of acetic acid and acetone. But pre-distillation of the podsmol water, which is necessary for obtaining gray powder, requires both fuel and special equipment, which increases the cost of its production. No less complex equipment is required for various types of tar separators, proposed in different designs for the direct production of powder from the podsmolny water. Obtaining black powder from the podmolnaya water is economically much cheaper in terms of both the equipment and fuel and labor costs, but its quality is low due to the content of resinous impurities in it, making it difficult to produce acetic acid from it, acetone; or acetic acid, and the methods for its purification that have been proposed so far have not led to satisfactory practical results. .

The proposed method, which turned out to be suitable for the purification of both ready-made resinous acetic salts and neutralized podsmolnaya water, is based on the observation that agitated caustic lime, as well as hydrates or basic acetic acid salts of weak bases, such as iron, aluminum, and lead. when heated to 60-100 °, they act on resinous impurities and carry them into the sediment. According to the nature of the precipitating substances, the cleaning operation is conducted in an alkaline solution and consists in the fact that the solution is treated with lime or other appropriate substances when heated to 60-100 °; after removing the precipitate formed by settling or filtering, the clarified solution is evaporated and dried or crystallized in order, resulting in a net product, freed at 60-90 ° / o from the initially contained resins, at a rate of precipitator at 1 by the weight of the dry salt. When working carefully, the resulting pure product contains only.

extraneous bases, for example, lead, iron, etc .; the latter, if desired, can easily be regenerated in the form of oxides from resinous sludge by burning it.

The subject of the patent.

The method of purification of resinous impurities from the podsmol of water, technical calcium acetate (powder) and technical sodium acetate, characterized in that: that the bottom water after its neutralization, and the calcium and sodium acetate, after dissolving in water, are alkalinized and processed in an alkaline solution or calcium oxide hydrate, or hydrates of oxides of aluminum, iron or lead, or their basic acetic acid salts when heated to 60-100 ° C, in order to separate the resinous impurities.