Coke inhibitor for ethylene cracking

Abstract

The invention relates to coke inhibitor for ethylene cracking, which comprises the following component by weight percentage: 20% to 60% of sulfur-containing compound, 5% to 10% of passivator, 1% to 10% of film-forming agent, 5% to 15% of polymerization inhibitor, 1% to 10% of decoking agent and 25% to 45% of solvent, wherein the sulfur-containing compound is particularly dialkyl disulfide, dialkyl sulfide, di-alkylphenol sulfide, diphenyl sulfide, diphenyl disulfide, thiophene or thioxene; and the passivator is particularly triphenyl phosphate, triethyl phosphate, di-octyl-phenyl-phosphate, tributyl phosphate, thiophosphate trilaurate, diethyl-phosphorodi-thioate or triacyl piperidine phosphate, and the passivator is preferably triphenyl phosphate or di-octyl-phenyl-phosphate. The coke inhibitor of the invention for ethylene cracking is capable of effectively relieving the coking condition of an ethylene cracking tube, ensuring the good coke-inhibiting effect, obviously increasing the operation cycle of cracking and reducing the air-decoking time. Therefore, the coke inhibitor of the invention has wide applicable range in the coke inhibition of gaseous light dydrocarbon and naphtha.

Description

technical field [0001] The invention relates to an ethylene cracking coke inhibitor used for ethylene cracking furnace tubes, belonging to the field of oil refining aids. Background technique [0002] Among the methods of producing ethylene by cracking hydrocarbon raw materials, the tube furnace steam cracking method accounts for more than 90%. High-temperature pyrolysis of hydrocarbons inevitably leads to the generation of by-product coke, which accumulates on the inner wall of the furnace tube to form a coke scale layer, which affects the heat transfer of the furnace tube, increases energy consumption (the cracking furnace accounts for 60% of the energy consumption of ethylene production), and increases the system pressure. As a result, the pipes will be blocked. For this reason, regular coke cleaning is required, including short-term steam-air scorching and long-term mechanical or hydraulic coke cleaning. Frequent cleaning and scorching not only reduce the operating rate ...

AI Technical Summary

Problems solved by technology

Therefore, keeping the quenching section at 500-600°C is not easy to achieve the purpose of cleaning all the coke and descaling

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