Oil slurry scale inhibitor of catalytic cracking unit and preparation method thereof

Abstract

The invention relates to an oil slurry scale inhibitor of a catalytic cracking unit and a preparation method thereof. The scale inhibitor is prepared from the following raw materials in percentage byweight: 5 to 10 percent of a scorch retarder, 5 to 10 percent of a polymerization inhibitor, 25 to 30 percent of a dispersing agent, 15 to 25 percent of a cleaning agent, 5 to 10 percent of a corrosion inhibitor and the balance of solvent. According to the preparation method, all the raw materials are mixed and stirred. The scale inhibitor can effectively inhibit scale deposition of an oil slurryand residual oil system; and the scale can be effectively removed in a short time to ensure the normal circulation of the slurry oil system, thereby stabilize the normal operation of the fractionationsystem and the vacuum residue system, lower the outlet pressure of the slurry oil pump, save energy, reduce consumption, ensure the product quality, and ensure the high-efficiency, high-quality and stable operation of the device. The preparation method is simple and easy to control, and large-scale production is facilitated.

Description

technical field [0001] The invention belongs to the field of scale inhibitors, and in particular relates to an oil slurry scale inhibitor for a catalytic cracking unit and a preparation method thereof. Background technique [0002] The catalytic cracking unit is the core unit of secondary processing. With the increasing weight of catalytic cracking raw materials, the scaling and coking problems of equipment not only run for a fixed period, but also directly affect the safe operation of equipment. Refining workers have proposed a series of solutions to the fouling problem from different perspectives such as equipment, process, and operation, such as lowering the temperature at the bottom of the fractionating tower, reducing the residence time, increasing the flow rate of the oil slurry, and installing an oil slurry filter. Certain effects, but there are certain limitations. [0003] The fouling problem of the fractionation tower bottom oil slurry system of the catalytic cra...

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Problems solved by technology

It will cause unplanned shutdown, but the heat exchange effect of the oil slurry heat exchanger is reduced due to fouling, and the return refining oil (quench oil) is injected into the bottom of the tower to reduce the temperature at the bottom of the tower, and the heat extraction requirement is met by reducing the pressure of the steam drum, causing the fractionation tower The operating flexibility is very small, the product distribution becomes poor, and the oil slurry yield increases, which seriously limits the processing capacity of the fractionation tower, seriously affecting the safety and long-term operation of the device

[0004] However, there is currently no effective solution to these fouling situations.

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