SU57940A1 - The method of obtaining acetic acid - Google Patents

Description

Nowadays, reprocessing acetic acid - galciyevin salt (powder) is prepared at the factory's refining facilities using the following technology.

Simultaneously with the loading of the powder, sulfuric acid is supplied to the apparatus, the excess of which, in order to avoid the possibility of gypsum (for1M1ORJI1vani): Mass: up to 140V or more from the theoretically necessary. For the fullest possible extraction of the acetic acid remaining in the gypsum, half an hour before the end of the operation, the oshar is blown or blown with hot steam or 3–4 buckets of water. Acid- (raw material is collected (to the total loss: pH and always more silt) less saturated with sulfurous acid, resulting from the destruction of sulfuric acid, and contains formic acid and other impurities. The loss of acid, in terms of acetic acid, is up to, presumably due to destruction of ant KI1Sloty.

With an atom, as was determined by observations and experiments, the destruction of sulfuric acid and the main mass of formic acid occurs in the second half of the process, after the whole raw material is distilled.

According to the invention, these losses can be significantly reduced by the fact that after decomposition of the transverse powder with sulfuric acid, first the amounts of acetic acid corresponding to the total yield per loaded powder are distilled off, and then the residue of acetic acid is distilled from the reaction mixture into a separate receiver, adding to it gradually, according to 1 distillation measure), in order to dilute it, Water or diluted acetic acid.

Since the destruction of sulfuric and formic acids is essentially a consequence of the distillation of most of the acid and water, which play (the role of a buffer between sulfuric and formic acid, gradually feeding into the residual reaction mass or acetic acid or replacing this buffer water) As far as distillation is concerned, warns ITO destruction.

In this case, flushing the gypsum with live steam or using water at the end of the operation is no longer necessary.

Such process management reduces the consumption of sulfuric acid, since its excess in the second stage of the process with the introduction of water or dilute acetic acid in

It is unnecessary, and the loading rate of sulfuric acid can be lowered to against the theoretically required amount.

The subject matter of the invention.

GnOiCo6 of acetic acid production by decomposing wood powder with sulfuric acid and distilling off the acetic acid produced therewith, characterized in that firstly TOVtt of the amount of acetic acid corresponding to the total input based on the duster, then the residue acetic acid is distilled off distilled from the reaction, omeoi, gradually as OTGOIKEDObil to the latter, with the purpose of its liquefaction, water or diluted, acetic acid, in a separate receiver.