SU398553A1 - METHOD OF ISOLATION OF SYNTHETIC RUBBERS - Google Patents

Description

one

A known method for isolating synthetic rubbers is that the polymer solution, directly or in the form of an emulsion with water, is fed to an apparatus equipped with a stirring device and filled with hot water. The release of the polymer is removed from the apparatus with water in the form of a suspension.

The solvent is taken in the vapor phase together with a roll of water. Heat is used to dissolve the solvent and part of the water, as well as to heat the water and the polymer to the required temperature, by condensation of the water vapor that enters the apparatus from the steam line from an energy source.

The steam condensate, together with the aqueous suspension of the polymer, is etched into separating the polymer from the water, which is carried out by known methods. Most of the water is returned to the nropess. Due to the vapor condensate, an excess of water containing catalyst decomposition products, surface active substances and solvent impurities is taken out of the cycle for cleaning and extraction of the products to be regenerated, and then discharged into the sewage system for chemical waste.

The withdrawal of excess water from the cycle, which, depending on the polymer being produced and the solvent used, is 4–20 m per ton of polymer, is discharged into the sewage system and, on the one hand, the volume of chemically contaminated wastewater increases On the other hand, the appropriate quantity of chemically purified (desalinated) water is required for pulling a steam boiler of an energy source.

In addition, the regeneration of any products from the water withdrawn from the cycle is made difficult by the fact that the content of these products in the circulating water is kept minimal to prevent contamination of the polymer.

The purpose of the invention is to develop a method for separating a polymer from a solution, which can significantly reduce the formation of chemically contaminated wastewater. To return the steam condepsate to power the energy source steam boiler, and to increase the concentration in the expelled water of the products to be removed without increasing the content of the previous and circulating water.

It is proposed to remove the iolimer from the solution, consisting in a pressure that a certain quantity of water circulating in the process is supplied by a surface evaporator, where most of it is vaporized, which is called fuse vapor and is used as a heating agent for separating the polymer.