Residual oil modifier for coking delaying device and use thereof

Abstract

The invention relates to a residual oil modifier for a coking delaying device and use thereof. Overcoming the drawbacks of the prior art, the invention provides the modifier, which has high practicality for raw material residual oil and can effectively improve the properties of residual oil, delay coking, effectively reduce coking amount and consequently improve the yield of middle-grade distillate. The modifier is prepared from 1 to 25 percent of antioxygen, 1 to 20 percent of oxidation and corrosion inhibitor, 1 to 25 percent of metal deactivator, 1 to 20 percent of dispersant and the balance of solvent, and by heating, uniformly stirring and cooling. The product has high oil solubility, and the product and raw material oil can quickly dissolve in each other; the filling is more convenient and does not influence the normal production of the device and the quality of the product; less dry gas and coke are produced, the yield of light oil is increased, and the coking and scale depositing of the system are prevented; and the thermal stability is high, so volatilization and decomposition at high temperature are prevented. The modifier is suitable for coking delaying devices which use paraffin-base, intermediate-base and naphthenic-base residual oil as raw materials.

Description

technical field [0001] The invention relates to the field of organic chemistry, in particular to a residue modifier for a delayed coking unit and its application. Background technique [0002] Delayed coking is the process of converting residual oil into gas, light and middle distillate oil and coke through deep thermal cracking. It is the main means for refineries to increase the yield of light oil and produce petroleum coke. Compared with catalytic cracking, it has the advantages of less investment in equipment, simple production process, wide source of raw materials and low operating cost. [0003] The key to improving the economic benefits of the delayed coking unit is to reduce the yield of coke and dry gas, and increase the yield of high value-added products such as liquefied gas, gasoline, diesel oil, and wax oil. Therefore, some foreign oil companies have launched research. The main ways to increase the yield are: (1) Residual oil is first hydrogenated and then cok...

AI Technical Summary

Problems solved by technology

[0007] Patent 200410006146.3 proposes an additive to increase the yield of light oil in delayed coking units, wherein the additive includes pyrolysis active substances such as block polyether of 5000-12000 polyoxyethylene and polyoxypropylene block copolymerization, free radical chain reaction inhibition Agents such as tetrakis[(β-(3,5-di-tert-butyl-4-hydroxyphenyl)] octadecyl propionate and anti-scorch agents have complex structures and their sources will be limited

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