SU56044A1 - The method of obtaining artificial resin - Google Patents

Description

The invention relates to the field of producing an artificial resin based on the use of acidic petroleum tars, which are garbage from cleaning lubricating and lighting oils with sulfuric acid.

The method consists in applying to the acidic tars of a certain composition the so-called formalite reaction, which was discovered in its time by prof. A. M. Nastyukov, in somewhat modified conditions. As is known, the formalite reaction of A.N. Nastyukova consists in the action of formalin on oil and its epaulettes in the presence of strong sulfuric acid, and a solid insoluble reaction product is formed, which is a plastic mass and has dielectric properties.

The authors found that if acid tars were taken as a raw material, then the formalite reaction could be carried out; neither oil nor strong sulfuric acid could be added to it, since acid tar contains these elements in such a combination that the reaction goes with good yields, despite the fact that the content of petroleum hydrocarbons in

It is relatively small, and sulfuric acid does not have the strength that is needed for a normal formalite reaction. This is due to the fact that acid tars hydrocarbons, unlike crude oil or its epaulets, completely react with formaldehyde and, being undiluted with inert saturated hydrocarbons, these conditions are more active. Therefore, this reaction, unlike the usual formalite reaction, immediately yields the so-called "second formalite, i.e., formalite, which does not contain adsorbed inactive saturated hydrocarbons, in contrast to the" first formalite, the usual first formalite product requiring its conversion to the second formalite, the extraction from it of adsorbed hydrocarbons with gasoline.

This greatly simplifies the entire technological process for the preparation of a non-formalite compacted powder, since there is no need for an extraction separation device. As a waste, a weak sulfuric acid is obtained, with a strength of 25-ZO / O, which, however, should also be used as in the manufacture of conventional neoformalig, for example, for the production of Sorel cement or nickel plating of metals. Sulfuric acid is thus easily separated from acid tar after appropriate dilution with water, since the resulting formalite has no excess and is easily filtered out. The pressure powders obtained from formalite in all their indicators are close to those of the usual neoformlite press steam bars.

Example. Acidic tar, containing about monohydrate of gray acid, 25 / o of hydrocarbons reacting with formaldehyde and water, etc., is mixed gradually with cooling from 45 vol. h. formalin strength of about 100 about. tar tar After the introduction of the total amount of formalin with stirring, raise the temperature of the mixture to 80 ° and after half an hour pour in equal or

half the volume of water and steam is passed through the mixture for half an hour. The precipitate is filtered, washed with water, neutralized with ammonia and mixed with wood flour. After drying, a semi-finished product is obtained, which, as a pressed powder, can be pressed as such or with the usual additives for dl. neoformalite plasticizers (rubber, novolak, etc.). The output of intermediate 25-ZO / o from acid tar.

The subject matter of the invention.

A method for producing an artificial resin using acidic oil tar and formalin, as dry / common, as ingredients for condensation: acid tar | treated with cooling of 3-9 / o (by weight of tar) formalin, the reaction mass after the end of condensation is diluted with water, the condensation product is filtered off and purified by known methods.