Hydrocracking scale inhibitor

Abstract

The invention discloses a hydrocracking scale inhibitor. The hydrocracking scale inhibitor is characterized by being prepared from the following components by mass: 25-40 percent of cleaning dispersant, 6-12 percent of antioxidant, 5-10 percent of corrosion inhibitor, 0.5-3 percent of detergent, 0.2-1 percent of poly alpha-olefin, and the balance of water; the cleaning dispersant is polyisobutylene succinimide. The hydrocracking scale inhibitor disclosed by the invention has the advantages of low freezing point, small viscosity, and mechanical impurity being less than or equal to 2 percent; the hydrocracking scale inhibitor has a good dispersion effect on catalyst powder in slurry oil, prevents the powder from being coagulated and settled, and can effectively inhibit coking of equipment such as a feed heat exchanger; the hydrocracking scale inhibitor is applied to the feed heat exchanger of a catalytic cracking device for scale inhibition and scale removal, the addition quantity in fresh feed slurry oil is 50-100 ppm, and a scale inhibition rate can reach 85 percent or more; after coking phenomenon of the heat exchanger is changed, the efficiency is improved, heat exchange and reaction are more sufficient, the temperature of the slurry oil returning to a tower is decreased, and the amount of steam generation is increased.

Description

technical field [0001] The invention relates to a scale inhibitor, in particular to a hydrocracking scale inhibitor for inhibiting fouling of a feed heat exchanger of a hydrocracking unit. Background technique [0002] In the process of petroleum processing, the catalytic cracking unit is one of the important devices in the refinery. As the quality of crude oil becomes heavier and worse, the oil processing conditions become more harsh, and the fouling problem of oil processing equipment and pipelines becomes increasingly prominent. The raw materials used for the catalysis of the main secondary processing unit have also become more and more complex, and the content of aromatics and condensed ring aromatics in the oil slurry has increased. Fouling of the feed heat exchanger, decreased heat transfer efficiency, increased fuel consumption of the heating furnace, increased pressure drop, etc., frequent cleaning of the heat exchanger affects normal production, shortens the start-...

AI Technical Summary

Problems solved by technology

The raw materials used for the catalysis of the main secondary processing unit have also become more and more complex, and the content of aromatics and condensed ring aromatics in the oil slurry has increased. Fouling of the feed heat exchanger, decreased heat transfer efficiency, increased fuel consumption of the heating furnace, increased pressure drop, etc., frequent cleaning of the heat exchanger affects normal production, shortens the start-up period, and in severe cases causes the device to be forced to stop production

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