Device and method for separating residue from catalytic cracking oil slurry

Abstract

The patent discloses a device for separating residue from catalytic cracking oil slurry, which comprises at least two filter sets and a filter cake tank, wherein the at least two filter sets are formed by connecting pre-filters and fine filters; the filter cake tank is arranged between the bottoms of the pre-filters and the fine filters for accommodating a peeled filter cake and washed washing oil; the bottom of each pre-filter is connected with a raw material oil slurry inlet and a washing oil inlet, and the bottom of each fine filter is connected and provided with a washing oil inlet for washing the filter core of the filter; an oil slurry filtrate outlet is formed on the top of each fine filter; and backwash air inlets are formed on the tops of both the pre-filters and the fine filters. Meanwhile, the patent also discloses a method using the device. The residual catalyst content of the oil slurry filtrate processed by the device in the patent is less than 0.01 percent, and filtrate content is less than 0.02 percent.

Description

technical field [0001] The invention relates to the field of petrochemical industry, in particular to a device and method for improving the quality of catalytic cracking oil slurry by filtering and removing asphaltenes and residual catalyst particles in catalytic cracking oil slurry. Background technique [0002] Catalytic cracking is the most important heavy oil lightening process in the oil refining industry. The catalytic cracking oil slurry contains a large amount of aromatics and naphthenes and some aromatic components with low condensation degree. Components can be used as raw materials for hydrocracking to produce high-quality light hydrocarbon components; in addition, due to heavy components and high aromatic content, catalytic cracking oil slurry has high density, high viscosity, and high solubility and compatibility with polymer materials. Compatibility etc. However, due to the existence of asphaltenes and catalyst particle residues in ordinary catalytic cracking ...

AI Technical Summary

Problems solved by technology

Although this patent can thoroughly purify catalytic cracking oil slurry, the process conditions are harsh and the cost is too high, so it is not easy to promote industrialization

[0006] The second is to introduce an organic solvent (water) or other additives into the oil slurry to transfer the residual catalyst particles in the oil slurry to the extraction solvent through extraction and demulsification. The disadvantage of this method is that not only A large amount of solvent is consumed, and the complete separation of liquid and solid cannot be achieved

[0008] 1. The filter is easy to block. After investigation, the technicians of the chemical refinery who currently adopt the filtration separation method for catalyst recovery and separation generally report that the blockage of the filter is very serious, which often leads to downtime for maintenance, which is time-consuming and laborious. The phenomenon of filter blockage leads to Manufacturers at home and abroad have basically given up using this method for catalytic cracking oil-slurry separation, and instead adopted the first or second method for oil-slurry separation. This can also be seen from the number distribution of domestic patent applications in this field. In 1999, after the No. 1 Refinery of North China Petroleum Administration Bureau applied for "a method for separating catalyst particles from catalytic cracking oil slurry", there was no new domestic method for separating catalyst particles from catalytic cracking oil slurry by filtration separation method. Patent applications, but the second type of patent applications that use the method of introducing organic solvents (water) or other additives into oil slurry to separate catalyst particles is increasing, indicating that filter clogging is the bottleneck technology for catalyst separation using filtration separation methods, has been difficult to break through

[0009] 2. The oil slurry treated by this patent method still contains about 0.02% catalyst particles, which makes it difficult to further improve the quality of the oil slurry clear liquid

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