The residual carbon value of the oil refers to the percentage of the mass of the oil formed by the carbon residue after evaporation and thermal cracking process under specific high temperature conditions. The size of the residual carbon value is related to the chemical composition and ash content of the oil. In addition to ash, gums, asphaltenes and PAHs in oil products are the main sources of residual carbon. Therefore, in general, the residual carbon measurement value of petroleum products can be used to characterize the relative coking tendency of the oil (except for the oil containing ash additives), which can be used to guide the selection of raw materials and the production process of oil products. The micro method is a simple and efficient method for residual carbon determination which has been commonly used at home and abroad in recent years, and was officially listed as a standard method in China in 1997; the electric furnace method originated from the former Soviet Union and is used in few countries; the Lang method is less used because of the approximate relationship between the residual carbon data and the Kang's residual carbon. In view of the differences in the working principle, experimental equipment, operating conditions and other factors of different residual carbon determination methods, the correlation between the determination results obtained by different methods has always been a concern for oil analysis workers.
Automatic trace residual carbon tester (Cone method)
The residue formed during evaporation and cracking of oil under specified conditions is called residual carbon and is expressed as a percentage by mass (m%). The residual carbon is an indirect indicator of the content of colloidal substances and unstable compounds in lubricating oil, and is also a sign of the degree of refinement of mineral lubricating oil base oil, which is high when the lubricating oil contains more sulfur, oxygen and nitrogen compounds. Generally, the residual carbon of oil with deep refinement is small. For general lubricating oil, residual carbon has no separate use significance, but for internal combustion engine oil and compressor oil, residual carbon value is one of the factors affecting the tendency of carbon accumulation, the higher the residual carbon value of oil, the greater its tendency of carbon accumulation, and the more carbon accumulation in compressor cylinder, expansion ring and exhaust valve seat, which is easy to explode under high temperature.
The oil with high additive content is controlled the residual carbon of its base oil, but not the residual carbon of the finished oil.
Micro residual carbon tester use precautions
1、 The fan of the instrument is to cool down the sample quickly or to dissipate the heat of the instrument components when the room temperature is high (for example, in summer), which can be used as needed.
2、 The temperature of raw coke oven and furnace cover is high during the work, so care should be taken to avoid burns and scalds.
3、 The test tube holder should be placed carefully to avoid the position of the thermocouple.
4、 When the number of test tubes is small, try to put them into the holder in a symmetrical distribution, so that they can be easily put in and taken out.
5、 After cleaning the exterior of the instrument, please apply a layer of lubricant to protect it, and avoid getting it on your clothes.
6、 Regularly clean the waste liquid bottle and the exhaust gas outlet connection tube to clean up the residual liquid in time.
7、 Press the operation key position on the touch screen, should avoid using fingernails, or other hard objects, to ensure its normal use.
8、Because the specimen produces steam at high temperature, it is prohibited to open the raw coke oven, furnace lid during the test if it comes into contact with air, it is easy to produce the risk of combustion or explosion.
9, weighing data input: empty tube weight < do after the weight if there is empty tube weight > do after the weight, may be caused by improper handling of the empty tube before the test.
10, the internal components of the instrument has been adjusted at the factory, if you need to adjust again, you should ask our professional staff to adjust, if you adjust, the consequences of adverse consequences at your own risk.