Delayed coking antifoaming agent

Abstract

The invention relates to a delayed coking antifoaming agent. The antifoaming agent has low silicone content and stronger foam inhibition performance at the high temperature. The delayed coking antifoaming agent comprises an antifoaming component, a foam inhibition component and a solvent. The antifoaming component comprises organopolysiloxane and dewatering vapor phase process silicon dioxide; the foam inhibition component comprises modified polyether and long chain fatty alcohol; the solvent is one of hydrofining diesel oil, coal oil, heavy aromatics and solvent oil with the viscosity of 20 to 200 cst. In the proportion of the three components by weight, the antifoaming component accounts for 5% to 12.5%, the foam inhibition component accounts for 40% to 75%, and the solvent accounts for20% to 50%. The invention can be used in the delayed coking process in oil refineries and has the operating temperature of 350 to 540 DEG C, the antifoaming agent consumption of 20 to 50 ppm, low silicone content which is no more than 3.5%, good antifoaming effect, high antifoaming efficiency, and low cost.

Description

technical field [0001] The invention relates to a delayed coking defoamer, which belongs to the technical field of oil refining aids. Background technique [0002] Delayed coking process is a process for converting residual oil into gas, gasoline, diesel oil, wax oil and coke through deep thermal cracking. It is an important means for refining residual oil processing and improving the yield of light oil. Its investment and operating costs Low, strong adaptability to different raw materials, mature technology. In the delayed coking process, with the gradual increase of the processing capacity, the contradiction between the foam layer and the empty height of the coke tower and the safety of production becomes more prominent. When the fines are brought into the fractionation tower, the large amount of coke powder carried not only increases the coking tendency of the coke tower top oil vapor line, but also continuously deposits at the bottom of the fractionation tower, clogging...

AI Technical Summary

Problems solved by technology

This method can eliminate a certain amount of foam in the coke tower, and can partially improve the utilization rate of the coke tower. Compared with the injection of silicon-containing defoamers in the entire operation cycle, the silicon content in the coking distillate oil is greatly reduced. The disadvantage is the efficiency Not high, equipment utilization is not significant

[0011] Chinese patent CN1919439 reports that a defoamer for the foam treatment of the coke tower foam layer of a delayed coking unit in an oil refinery is provided. It is directly mixed with 30-50% of type fatty acid ester and 20-30% of organosilicon compound, and the defoaming rate is over 50%. The coking time is increased from 24h to 28h, and the effective utilization rate of the coke tower is over 80%, especially the yield of light oil is greatly improved, and the energy consumption is reduced. Hydrogen catalysts cause silicon poisoning

Although some refineries in my country have realized the necessity of injecting defoamers into coking units, they have insufficient experience in the use of defoamers, resulting in ineffective defoaming effects and poisoning of subsequent hydrogenation catalysts.

Images