Method for measuring solid content of catalytic slurry oil

Abstract

The invention discloses a method for measuring the solid content of catalytic slurry oil, which comprises the steps of slurry oil heat treatment, solvent dilution, centrifugal treatment, filtration and enrichment, drying and weighing and the like, can accurately measure the solid content of the slurry oil, and can obtain a certain amount of solid fine powder sample for property characterization at the same time. According to the method, the problem of reading errors in calculation of the solid content volume by a traditional centrifugal method is solved, neglect of the ash content in measurement of the coke powder content is avoided, the time for measuring the solid content by a single filtering method is shortened, the measurement of the solid content of the oil slurry is more accurate, stable and rapid, meanwhile, a certain amount of solid content can be obtained for analysis of properties such as particle size and composition. Technical support is provided for investigation of oil slurry solid content and other properties and safe and stable operation monitoring of refinery plant devices.

Description

technical field [0001] The invention relates to an analysis and measurement method for solid content in catalytic oil slurry, in particular to a method for measuring the solid content (hereinafter referred to as solid content), particle enrichment and particle size of catalytic oil slurry, belonging to the technical field of petrochemical analysis. Background technique [0002] Catalytic cracking oil slurry (hereinafter referred to as oil slurry) is a by-product of external dumping during the processing of catalytic cracking units, and the domestic annual output is about 7.5×10 6 t above. As a by-product of the catalytic cracking process, the catalytic cracking oil slurry generally contains more than 2000-5000 μg / g of solid particles such as catalyst particles and coke powder. These solids, especially catalyst particles, are likely to cause many problems such as system wear, blockage, and coking during the circulation process of the catalytic cracking unit, which greatly re...

AI Technical Summary

Problems solved by technology

CN103196776A discloses a method for measuring the solid content of catalytic cracking oil slurry. A certain amount of diluent is added to the oil slurry after preheating and stirring, and then filtered under reduced pressure to filter the insoluble matter on filter paper. The filter paper is extracted until it is colorless, and the solid content of the oil slurry is obtained by measuring the mass of solids on the filter paper after drying. This method has high measurement accuracy, but the measurement method takes a long time

[0004] The traditional centrifugation method to measure the solid content is to calculate the solid content by reading the volume of the solid in the centrifuge tube and looking up the table. The measurement speed is relatively fast, but its measurement precision and accuracy are relatively low, and the measurement results are largely affected by human factors. In addition, the error of this reading is too large, and the repeatability of the experiment is very poor.

The ash method is the simplest measurement method, but the coke powder in the oil slurry sample is usually burned at high temperature, and the coke powder content in the solid content is lost, resulting in low measurement results; the carbonization burning method is usually regarded as It is a relatively accurate and stable method for solid content measurement, but the equipment requirements are relatively high, and most laboratory conditions are difficult to meet, and cannot cope with daily frequent analysis and measurement. At the same time, the burning method will produce some inorganic salt substances; The accuracy is relatively high, and it is widely used in the measurement of the solid content of oil slurry. However, in order to avoid the escape of small particles in the filtration, the filter membrane with a small pore size is generally selected, which leads to too much resistance in the filtration, and the pumping The extraction is too slow and takes a long time. In addition, due to the gluing effect of asphaltene and small-sized solid particles, sometimes the measurement result of the solid content of the oil slurry is too large

All in all, traditional solids measurement methods have limitations to varying degrees

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