Analysis of wax content in petroleum products
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I have a question for everyone. During the production process, the unit experienced abnormalities due to the high wax content in the raw materials (from lines 2, 3, and 4), which was significantly different from the specified values for those raw materials. Samples of these raw materials were sent to various testing laboratories for analysis, and the results varied greatly – one lab reported a wax content of around 40%, while another reported around 70%. I would like to ask if there are any standard methods for analyzing the wax content in petroleum products (side-stream oils) How many methods are there for analyzing wax content, and what are the standard numbers for each standard? What causes such a large difference in the results of this analysis (between two reputable testing institutions)?
SY/T 0537-2008: Determination of wax content in crude oil; SH/T 0425-2003: Method for determining wax content in petroleum asphalt; GB/T 26982-2011: Determination of wax content in crude oil; SH/T 0778-2005: Method for determining wax content in petroleum asphalt (cracking and extraction method). If the results obtained by two testing laboratories differ, could it be due to different methods? The skill level of the operators also plays a role, as there is a big difference between beginners and experienced workers. In short, there are many factors that make it difficult to determine the cause.
I would like to ask: these methods are all used to determine the wax content in crude oil or petroleum asphalt, but are there any analysis methods for side-stream oils? Furthermore, is the method for detecting wax content in crude oil applicable to side-stream oil? Is there any upper limit requirement for the wax content detected? Since my product has a high wax content – one laboratory tested it and found the level to be 68% – can crude oil be used in such cases? I’m an outsider from the production department; I don’t understand laboratory testing work!
I would like to ask: these methods are all used to determine the wax content in crude oil or petroleum asphalt, but are there any analysis methods for side-stream oils? Furthermore, is the method for detecting wax content in crude oil applicable to side-stream oil? Is there any upper limit requirement for the wax content detected? Since my product has a high wax content – one laboratory tested it and found the level to be 68% – can crude oil be used in such cases? I’m an outsider from the production department; I don’t understand laboratory testing work!
GB 3554: Petroleum wax content, use this method. Initially, we used small-scale devices based on petroleum for oil removal and dewaxing; this method took a long time, was toxic, and had many influencing factors. Later, an expert from the company came by, and after his advice, we decided to use GB 3554 standards for more accurate results, as well as to reduce the time required. This is to remove the oil from the sample; by subtracting 100% from this value, the wax content can be determined. Using the asphalt wax content method results in lower values. The sample weight is too small and not representative. The method for determining crude oil wax content uses benzene-propane, but it has not been done yet. . . . . Based on your 68% figure, it is not recommended to use the crude oil method; multiple sample transfers are involved in the sampling process, and with such a high wax content, losses will definitely occur during these transfers.
This post was last edited by Shangshan Datulaohun on 2018-2-28 at 22:47. I once read a paper stating that the results of wax content determined by different methods, in descending order, are: UOP46 > SY/T0537 > SY/T7550 > ГОСТ11851. It is best to indicate the method used for the wax content results.