【Basic Knowledge Activity】Professional \"Basic Knowledge\" in the petrochemical industry: What are the indicators used to assess gasoline stability?
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This post was last edited by Adventure Dog on 2016-3-6 at 17:16. What are the indicators used to assess the stability of gasoline? Iodine value, actual gum content, and induction time============================================= [Petroleum and Chemicals Section] A compilation of professional “basic knowledge” posts is being carried out (the large forum offers surprises and prizes for participants). http://bbs.hcbbs.com/thread-1557057-1-1.html (Source: Haichuan Chemicals Forum) This initiative encourages various sections to organize or individuals to publish posts on basic knowledge topics; the content can be gathered from the Internet or created originally. Participation can take place through multiple themes, with no restrictions on the approach – it could be an explanation of a single term or an introduction to a series of principles. What are some suggestions and methods for getting in touch with cleaners? The regular administrator will reward the content that performs well. You will also be rewarded for regions where the activities are more intensive. (Regions should also carry out summarization and optimization based on the amount of such content available in their area.) ———————————————— The second phase of the event runs from February 20, 2016, to the end of June 2016; at least 50 award vouchers are available for you to claim (mugs, power banks, USB drives, and other prizes or event benefits). Prizes are awarded at any time based on performance, and additional rewards are given as well at any time depending on performance. (12,000 event points and rewards await the regions that perform well)
Iodine value, actual gum, and induction time
Iodine value, actual gum, and induction time
The indicators used to evaluate the performance of gasoline include octane resistance, volatility, calorific value, oxidation stability, corrosivity, detergency, and chemical composition. Explosion resistance. The ability to prevent detonation when gasoline burns in the engine cylinders is, in other words, the resistance to auto-ignition. It is an important performance indicator for gasoline. The anti-knock property of gasoline is expressed by octane number and anti-knock index; the higher the octane number, the better the anti-knock property of the gasoline. In our country, the Motor Method octane number was previously used as an indicator of gasoline’s anti-knock properties, and it was based on this value that gasoline grades were determined. Now switch to using the research octane number. Since 1970, the United States has used the octane rating as a measure of gasoline’s resistance to detonation, in place of RON. Vaporability. The property of gasoline to change from a liquid state to a gas state. The volatility of gasoline is the key factor determining whether it can form a good combustible mixture in the intake system; gasoline volatility is expressed by its boiling range and octane rating. The boiling range of gasoline is determined by heating to find the temperature at which the various fractions evaporate, as well as the final boiling temperature; these are referred to respectively as the 10%, 50%, and 90% distillation temperatures and the dry point. The lower this temperature, the less heavy fractions are present in the gasoline, which facilitates a more even distribution of the combustible mixture across the cylinders, resulting in more complete combustion. Heavy distillate gasoline does not evaporate easily; especially in winter, the portions that do not have time to evaporate and burn end up in the crankcase, where they dilute the lubricating oil and degrade its performance. Heat: It’s not true that the higher the volatility of gasoline, the better. An excessively high vapor pressure of gasoline leads to greater evaporation losses, which not only results in waste of gasoline but also increases pollution of the atmospheric environment. To reduce gasoline evaporation losses, modern cars are generally equipped with gasoline evaporation absorption devices. In summer, the high evaporation rate can cause air blockages in the engine’s oil circuit. Air resistance is a phenomenon in the fuel supply system where too much vapor is produced in the gasoline, resulting in a fuel supply volume that does not meet the engine’s operational requirements. Oxidation stability Oxidation stability. The antioxidant capacity of gasoline at normal temperature and in liquid state can also be referred to as chemical stability. It mainly depends on the origin of the crude oil, the refining methods, and the composition of the gasoline. The indicators of gasoline oxidation stability are actual gum and induction period. Gasoline with poor stability often turns yellow and develops gums due to heat, light, and other factors during storage, transportation, and use. Corrosivity Corrosivity. The substances that cause corrosion in gasoline are mainly sulfur, sulfides, organic acids, water-soluble acids and bases, etc. Gasoline standards set strict requirements for the sulfur content, acidity, copper strip corrosion test, as well as water-soluble acids or bases in gasoline. Purity Purity. It is indicated by the amount of mechanical impurities and moisture present in gasoline; gasoline should not contain any mechanical impurities or moisture. In addition, gasoline for electronically fuel-injected vehicles should also contain detergents and dispersants to prevent the formation of carbon deposits in the injectors, valves, combustion chamber, and other components. International standards include specifications for injector cleanliness and valve cleanliness, which serve as indicators of the cleanliness of the gasoline.
What are the indicators used to assess gasoline stability? Answer: The indicators for assessing gasoline stability are the iodine value, actual gum content, and induction period.
Oxidation stability. The antioxidant capacity of gasoline at normal temperature and in liquid state can also be referred to as chemical stability. It mainly depends on the origin of the crude oil, the refining methods, and the composition of the gasoline. The indicators of gasoline oxidation stability are actual gum and induction period. Gasoline with poor stability often turns yellow and develops gums due to heat, light, and other factors during storage, transportation, and use. @chunhui1009 @sdshihua @slll611 @zls1457 @Guan Gongyu @Linlin Shangshang @Ma Yiyi @Zhang Jun_nLlUg @OnlySingEcho
Actual gel time and induction period. The quality requirements for the stability of lead-free gasoline for use in vehicles are low actual gum content and a long induction period.
The indicators used to assess gasoline stability are: iodine value, actual gum, and induction period