DE1221845B - Diesel fuels - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. CL:

Number:
File number:
Registration date:
Display day:

ClOl

German KL: 46 a6 - 7

J21845IVd / 46a6
May 29, 1962
July 28, 1966

The wear and tear on the injectors of diesel engines using lighter fuels than Gas oil is becoming more and more problematic. This is especially true for engines that use different Fuels can be operated as they are used in developing countries in particular in which petrol-powered touring cars are not very common and in which there is therefore an oversupply consists of light petroleum fractions.

It is therefore the object of the invention to provide diesel fuel ^ with reduced wear and tear on injectors from light fuels or petroleum fractions to accomplish.

This is done by adding 0.01 to 5 percent by weight of a polyester of the formula:

R ₁ - (- OOC - A - COO - B -) "- OOC - A - COOR ₈

in which A is a divalent aliphatic, aromatic or naphthenic radical which may be substituted and contains 4 to 20 carbon atoms, B is an alkylene radical with 2 to 20 carbon atoms and R ₁ and R _{2 are} alkyl radicals and η is an integer at least equal to 1 .

The following connections can be used for this:

Diesel fuels

Applicant:

Institut Frangais du Petrole des Carburants

et Lubrifiants,

Rueil-Malmaison, Seine-et-Oise (France)

Representative:

Dr.-Ing. G. Riebling, patent attorney,

Lindau (Lake Constance), Rennerle 10

Named as inventor:

Jean Larbre, Colombes, Seine;

Louis Pons,

Rueil-Malmaison, Seine-et-Oise (France)

Claimed priority:

France of May 31, 1961 (863 694)

Mixed polyadipate from propylene glycol and isodecanol,

Mixed polyadipate from propylene glycol and isododecanol,

Mixed polysebacate from ethylene glycol and isohexanol.

These compounds are advantageously used at a concentration of from 0.01 to 5, and preferably from 0.05 to 0.5 weight percent used.

These products can be dissolved by diluting them beforehand using aromatic hydrocarbons or hydrocarbon mixtures with a high aromatic content, ν erdsa facilitates.

The polyesters used in the present invention have an effect lasting their time of use, so that the mechanical injectors can be used for several hours without significant wear and tear.

It should also be noted that when using the same amounts of the usual lubricants the same viscosity no comparable results can be achieved. The main characteristics of fuels and their octane numbers are not changed by the addition of these products, and the engine is not contaminated.

An injector set to a pressure of 170 kg / cm ² , the needle of which was previously irradiated in a nuclear reactor, is supplied with fuel by means of a piston pump. The metal particles resulting from the wear of the needle are washed away by the fuel and collect on a glass frit filter through which the fuel exits. By measuring the radioactivity of the filter, the amount of particles resulting from the wear of the needle is inferred by comparing it with parts of the same metal which have been subjected to the same irradiation and whose weight is known.

The fuel used is a non-ethylated gasoline with an octane rating of 87, in which a mixed polyadipate was dissolved from propylene glycol and crude isodecanol. The latter connection was made obtained by reacting 14.5 moles of adipic acid with 12.9 moles of propylene glycol and 5 moles of isodecanol.

On the basis of the results obtained, the following table was drawn up which, depending on the concentration of the additive expressed in percent by weight, shows the corresponding wear values of the injector at 25 ^° C. and at 70 ^° C., with wear being the ratio of the wear observed to that in the absence wear resulting from an additive, expressed by the corresponding weight loss.

609 607/181

additive Wear at a temperature α 70 ° C (in percent by weight) VOI
25 ° C 1 0 \ ' 1 0.5 0.01 0.75 0.40 0.02 0.50 0.25 0.05 0.32 0.15 0.1 0.25 0.07 0.2 0.20 - 0.5 0.11 - 0.85 0.08

If it is desired for the use of castor oil, a reduction of wear by 50% at 25 ° C achieved, an about 50 times higher concentration, ie use a l% strength must be ^e.

Claims (1)

Claim: Diesel fuels made from lighter fuels or petroleum fractions are labeled as gas oil by a content of 0.01 to 5 percent by weight of a polyester of the formula R ₁ - (- OOC-A-COO-B-) _{? L} -OOC-A-COOR ₂ in which A is a divalent aliphatic, aromatic or naphthenic radical which can optionally be substituted and contains 4 to 20 carbon atoms, B is an alkylene radical having 2 to 20 carbon atoms and R ₁ and R _{2 are} alkyl radicals and η is an integer at least equal to 1 . Considered publications:
U.S. Patent No. 2,844,448. 609 607/181 7.66 © Bundesdruckerei Berlin