DE596535C - Engine propellant - Google Patents

Description

GERMAN EMPIRE

ISSUED ON
May 4, 1934

REICH PATENT OFFICE

PATENT LETTERING

JVe 596535 CLASS 23 b GROUP 4oi

I. G. Farbenindustrie Akt.-Ges. in Frankfurt a. M. *) Engine propellant

Patented in the German Empire on May 18, 1932

As is well known, the exhaust gases from gasoline engines make their sharp and acrid Smell a great nuisance, especially in garages, near people who live there Rooms or in streets that are enclosed on both sides by high rows of houses and in which the gas exchange takes place less rapidly. This smell is based on very small amounts of half-burned oil and fuel and occurs in particular when the engine is idling or when the engine is set to retarded ignition, i.e. especially when starting. In the case of igniter engines, which are used almost exclusively in the automotive industry, the Engine with low air deficiency is common, which leads to increased fuel consumption and to generate particularly strong smelling exhaust gases because of the impossibility of complete Combustion of the ν, οηι piston pumped Lubricating oil, but corresponding to the greatest ignition speed for mixtures of around ι ο 0/0 lack of air to the greatest achievement of a given engine.

It has been proposed to remove these malodorous exhaust gases by absorption to be eliminated with active charcoal or similar substances or by switching on Catalysts to cause afterburning in the exhaust gas flow, but only that is possible with excess air in the gas mixture. Finally, verbena oil was also called Engine oil additive is recommended, in addition to improving the odor of the exhaust gases an increase in motor power is to be achieved. All of these attempts have turned out to be but cannot prevail in practice.

It has now been found that it is possible to control the exhaust gases from internal combustion engines to give a pleasant smell by adding what is known as artificial musk fragrances to the fuel Adds polynitro compounds of more highly substituted benzenes. Surprisingly be these compounds despite the presence of several nitro groups in the molecule, which these Should make bodies easily combustible, among those prevalent in the explosion engine Conditions not burned, but rather give the exhaust gases a pleasant one Smell that has the pungent odor of the half-burnt oil or fuel-oil mixture able to change.

Such musk bodies include, for example, the following: 2 · 4 · 6-trinitroi-methyl-3-tert.-butylbenzene, 2 · 4 · 6-trinitro-1 · 3-dimethyl-5-tert-butylbenzoL

2 x 4 x 6 - trinitro ^ -methyl ^ -tert-butylanisoL

3 · 5-Dinitro-2 · 4-dimethyl-6-tert.-butylacetophenone, Dinitro-tert-butyl-p-cymene, etc.

*) The patent seeker stated as the inventor:

Dr. Martin Bollmann in Dessau.

596 5B5

Such amounts of these bodies are sufficient that are not yet able to give the fuel itself a pronounced odor in order to achieve a distinct odor effect in the exhaust gas ru. As a rule, for example, about ο, ι g per liter is added to the motor gasoline, but in some cases this amount can even be reduced to ₃₀ g and less. It is of course also possible to use mixtures of the substances mentioned, or the impure products resulting from the manufacture or the pre- and post-runnings resulting from the distillation and which contain these polynitro bodies.

Claims (1)

Claim: The use of polynitr ο compounds of higher substituted benzenes, so-called artificial musk fragrances, as an additive to be used in small quantities to improve the smell of the exhaust gases to engine propellants.