scholarly journals Synthesis of biolubricants with high viscosity and high oxidation stability

2003 ◽  
Vol 10 (2) ◽  
pp. 150-154 ◽  
Author(s):  
Paolo Bondioli ◽  
Laura Della Bella ◽  
Andrea Manglaviti
Keyword(s):  
Oxidation Stability ◽  
High Viscosity ◽  
High Oxidation

Evaluation of the tribological properties and oxidative stability of epoxidized and ring opened products of pure rice bran oil

2020 ◽  
pp. 135065012095053
Author(s):  
Ananthan D Thampi ◽  
Abhishek R John ◽  
M Muhammed Arif ◽  
S Rani
Keyword(s):  
Hydrogen Peroxide ◽  
Vegetable Oils ◽  
Rice Bran ◽  
Rice Bran Oil ◽  
Research Work ◽  
Viscosity Index ◽  
Oxidation Stability ◽  
High Viscosity ◽  
Molar Ratio ◽  
Four Levels

Vegetable oils constitute a potential base stock for bio-lubricants, which has good biodegradability, high flash point, high viscosity index and excellent boundary lubrication properties. They also possess some limitations like low thermal and oxidation stability, poor low temperature properties and narrow range of viscosities. These limitations can be altered by modifying the vegetable oils chemically or by providing additives into the oils. This research work focused on the chemical modification of pure rice bran oil by epoxidation process using 30% hydrogen peroxide and glacial acetic acid. The epoxidized rice bran oil was then subjected to ring opening process using butanoic acid. The epoxidation process was optimized with four factors (Temperature, Time, Weight % of Catalyst, Hydrogen Peroxide molar ratio), each factors having four levels. The lubricant properties of pure rice bran oil (RBO), epoxidized rice bran oil (ERBO) and ring opened rice bran oil (RRBO) were studied. It was noted that the lubricant properties of ERBO and RRBO were better compared to pure RBO.

scholarly journals INVESTIGATION OF INFLUENCE OF ESTER STRUCTURE ON THERMAL-OXIDATIVE OILS STABILITY

2018 ◽  
Vol 61 (2) ◽  
pp. 73 ◽  
Author(s):  
Boris P. Tonkonogov ◽  
Leonid N. Bagdasarov ◽  
Kseniya A. Popova ◽  
Sergey S. Agabekov
Keyword(s):  
Oxidative Stability ◽  
High Performance ◽  
Viscosity Index ◽  
Oxidation Stability ◽  
High Viscosity ◽  
Test Method ◽  
Turbine Engines ◽  
Oil Composition ◽  
Frequent Change ◽  
Thermal Oxidative Stability

This work aims are analysis the influence of the structure of esters on their thermo-oxidative stability. Then we select the composition of additives to improve the oxidation properties of aviation turbine engines. As the main method we used the following study: Standard Test Method for Corrosiveness and Oxidation and Stability of hydraulic oils, aircraft turbine engine lubricants and other highly refined oils ASTM 4636-99. It has been found that the esters of dicarboxylic acids and aliphatic alcohols have a low thermal oxidative stability, which may result in frequent change in the oil lubrication system and washing with gasoline or jet fuel. Thus, compositions based on esters of dibasic acids and aliphatic alcohol are good plasticizers having abrasion resistance and frost resistance. Thought they have low pour points and high viscosity index. As a basis for aviation oil hindered esters are recommended, which have high thermal oxidative stability. In the industry esters obtained by etherification of the mixture of acids and a polyhydric alcohol are used. Esters are optimal on its viscosity-temperature properties which were obtained in the reaction of etherification of pentaerythrit and trimetilolpran alcohols, and mixtures of hexane, heptane, nonanoic, octanoic acids. Physico-chemical parameters of esters are improved with increasing in number of functional groups in the molecule. The reason for this is that the esters were obtained by the reaction of etherification of n-C9 acids with pentaerythritol alcohols which forms a sterically hindered ester. This structure has no hydrogen atom in the molecule in β-position, which prevents the formation of cyclic hydrocarbons. However, to get oils with high performance require it is necessary to add additives. Therefore, domestic and foreign literatures and requirements for oxidation stability were analyzed. Based on these data the main requirements were formulated for oil composition of aircraft gas turbine engines. As the results of the oxidative stability testing it were found that to obtain oil which satisfies to all modern requirements for thermal oxidative stability, it requires the use of complex of antioxidants of phenolic and amine types. Forcitation:Tonkonogov B.P., Bagdasarov L.N., Popova K.A., Agabekov S.S. Investigation of influence of ester structure on thermal-oxidative oils stability. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2018. V. 61. N 2. P. 73-79

Low-emission Fuel with High Biogenic Content and High Oxidation Stability

MTZ worldwide ◽  
2019 ◽  
Vol 80 (10) ◽  
pp. 70-75
Author(s):  
Ferdinand Bär ◽  
Olaf Schröder ◽  
Jürgen Krahl
Keyword(s):  
Oxidation Stability ◽  
Low Emission ◽  
High Oxidation

Experimental Investigation of Emissions Characteristics of Small Diesel Engine Fuelled by Blended Crude Palm Oil

2014 ◽  
Vol 660 ◽  
pp. 462-467
Author(s):  
Amir Khalid ◽  
M.D. Anuar ◽  
Azwan Sapit ◽  
Azahari Razali ◽  
Bukhari Manshoor ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Palm Oil ◽  
Oxidation Stability ◽  
Combustion Process ◽  
High Viscosity ◽  
Exhaust Emission ◽  
Crude Palm Oil ◽  
Performance And Emission ◽  
Emission Parameter ◽  
Oxygenated Fuel

Biodiesel is an alternative, decomposable and biological-processed fuel that has similar characteristics with mineral diesel which can be used directly into diesel engines. Crude palm oil (CPO) is one of the vegetable oil that has potential for use as a fuel in diesel engine. However, Biodiesel is also an oxygenated fuel and more density, viscosity meaning it contains influences the emissions production during burning process. Despite years of improvement attempts, the key issue in using crude palm oil fuels is oxidation stability, high viscosity and much oxygen comparing to diesel fuel. Thus, the improvement of performance and emission exhausted from biodiesel fuels is urgently required to meet the future performance and emission regulations. Purpose of this study is to explore how significant the effect of biodiesel blends on the exhaust emission with different speed. The engine speed was varied from 1500-2500 rpm and CPO blending ratio from 5-15 vol% (B5-B15).The emission parameter have been tested in term of opacity, hydrocarbon (HC), nitrogen oxide (NOX), carbon dioxide (CO2 ) and oxygen (O2). Increased blends of biodiesel ratio is found to enhance the combustion process, resulting in decreased the HC emissions and also other exhaust emission element. The improvement of combustion process is expected to be strongly influenced by oxygenated fuel in biodiesel content.

Naphthoate based lubricating oil with high oxidation stability and lubricity

2019 ◽  
Vol 138 ◽  
pp. 204-210
Author(s):  
Mingjin Fan ◽  
Jia Ai ◽  
Chenghong Hu ◽  
Xin Du ◽  
Feng Zhou ◽  
...  
Keyword(s):  
Oxidation Stability ◽  
Lubricating Oil ◽  
High Oxidation
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