Oxidační stabilita motorové nafty během dlouhodobého skladování

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22320%2F22%3A43923875" target="_blank" >RIV/60461373:22320/22:43923875 - isvavai.cz</a>

Výsledek na webu

<a href="http://paliva.vscht.cz/download.php?id=275" target="_blank" >http://paliva.vscht.cz/download.php?id=275</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.35933/paliva.2022.01.01" target="_blank" >10.35933/paliva.2022.01.01</a>

Jazyk výsledku

čeština

Název v původním jazyce

Oxidační stabilita motorové nafty během dlouhodobého skladování

Popis výsledku v původním jazyce

Motorová nafta doznala za posledních 25 let velikých změn ve složení. Naposledy to byl přídavek bio-paliv v roce 2007, který zásadně ovlivnil možnosti jejího dlouhodobého skladování. I za současných podmínek je však nutné v některých případech motorovou naftu dlouhodobě skladovat. A právě možnosti predikce skladovatelnosti motorové nafty jsou předmětem rešerše tohoto článku. Cílem bylo shrnout možnosti a na-vrhnout postup pro sledování a predikci její dlouhodobé skladovatelnosti.

Název v anglickém jazyce

Oxidation stability of diesel fuel during storage

Popis výsledku anglicky

Over the last 25 years, the diesel fuel has undergone major changes in its composition, which have fundamentally affected its long-term storage possibilities. An oxidation stability is a main parameter characteri-sing the storage of the diesel fuel and it is strongly affected by a diesel fuel composition. The oxidation stability decreases in a line saturated hydrocarbons – aromatic hydrocarbons – unsaturated hydrocarbons. The mandatory use of FAME as a biocomponent of the diesel fuel negatively affect its oxidation stability. The FAME contain unstable double bonds C=C and their mixtures with mineral diesel fuel cannot be storage for a long time. The use of antioxidants with FAME has not effect in the long time storage. A recommended usable life of diesel fuel with FAME according to ČSN 65 6500 is from 1 to 3 months according to the FAME content. However, in some cases it is necessary to store diesel fuel for a long time. State material reserves or back-up diesel generators are examples, when the diesel fuel is stored for the long time. The oxidation stability of the fuel expresses a re-sistance to an oxygen action. The oxygen, which is dissolved in the fuel, attacts molecules of the fuel and various oxidation products create. Hydroperoxides are the primary oxidation products. Secondary oxidation reactions give aldehydes, ketones, karboxylic acids and insoluble deposits. The oxidation products negatively affect the diesel fuel properties. Besides the composition the oxidation stability of the fuel is negatively affected by a high temperature,a high content of dissolved oxygen, an UV radiation and a presence of metals with a catalytic effect. An overview of methods used for the measuring or the observing oxidation stability was prepared in the article. It means not only the oxidation stability measu-ring but also a measuring of the content of different oxidation products which are related to the various oxidation degree . The aim of the article was to summarize the possibilities of a predicting the storage time of the diesel fuel and to propose a procedure for the monitoring and the predicting its long-term durability. Only one standardi-zed storage test according to the ASTM D4625 can be found in the literature. The test is based on the storage of 400 ml of the diesel fuel at 43 °C for periods of 4, 8, 12, and 24 weeks. After aging for a selected period, a sample is analyzed for insolubles. The correlation of the test results is: a week at 43 °C is roughly equivalent to a month of the storage at the temperature of 21 °C. The test is a time and material consuming and the correlation was determined for diesel fuels made up to 1990´s. The new shorter storage test based on the standard test according to ASTM D4625 was proposed to predict diesel storage stability. The temperature was rised and the the time was shortened up to one month. During the test short laboratory analyses can be used for monitoring oxidation of the diesel fuel for example: the oxidation stability by PetroOxy, the peroxide number, the oxidation index by infrared spectroscopy, the acid nu-mber, the bromine number or the antioxidant content. The sample consumption is about 100 ml according to the selected analyses.

Druh

J_SC - Článek v periodiku v databázi SCOPUS

CEP obor

—

OECD FORD obor

20704 - Energy and fuels

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Paliva

ISSN

1804-2058

e-ISSN

1804-2058

Svazek periodika

14

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

7

Strana od-do

1-7

Kód UT WoS článku

—

EID výsledku v databázi Scopus

2-s2.0-85130275833