Butadiene polymerization inhibitor used in separation system of ethylene unit

Abstract

The invention relates to the field of chemical additives, in particular to a butadiene polymerization inhibitor used in a separation system of an ethylene unit. The butadiene polymerization inhibitor is prepared from the following raw materials in percent by weight: 2-10 percent of radical capturing agent, 2-15 percent of antioxidant, 2-10 percent of metal passivating agent, 60-92 percent of organic solvent and 2-15 percent of clean dispersing agent. The butadiene polymerization inhibitor is prepared by the steps of: firstly adding 60-92 percent of the organic solvent in a container at normaltemperature under normal pressure, sequentially adding 2-10 percent of the radical capturing agent, 2-15 percent of the antioxidant, 2-10 percent of the metal passivating agent and 2-15 percent of the clean dispersing agent under stirring, uniformly stirring and completely dissolving to form a liquid. In the butadiene polymerization inhibitor provided by the invention, besides the efficient radical capturing agent, a synergetic effect is also specially considered with respect to components compatibility, thus, the polymerization inhibition effect is improved and the consumption of the polymerization inhibitor is decreased. The butadiene polymerization inhibitor provided by the invention is applied to a depropanizing column and a reboiler of the ethylene unit, and can effectively prevent butadiene from polymerizing and depositing on the surfaces of the devices.

Description

technical field [0001] The invention relates to the field of chemical auxiliary agents, in particular to a butadiene polymerization inhibitor used in the separation system of an ethylene plant. Background technique [0002] In ethylene production, raw materials such as light hydrocarbons and naphtha are subjected to high-temperature cracking and quenching, and the cracked gas is then compressed, alkali washed and separated, and finally polymerized grade ethylene and propylene are obtained. The material in the depropanizer of the separation system is mainly C3~C9 hydrocarbons, of which the mole fraction of butadiene is about 20~40%. Butadiene is often polymerized due to factors such as heat, oxygen, and metal ions, resulting in The fouling of the depropanizer and reboiler not only reduces the heat transfer capacity of the heat exchanger in the device, increases energy consumption, but also greatly shortens the operating cycle of the equipment, and even leads to unplanned shut...

AI Technical Summary

Problems solved by technology

However, its application in the process of butadiene extraction process cannot give full play to the ideal polymerization inhibition effect due to the lack of consideration of factors such as the catalytic effect of metal ions on the polymerization reaction of butadiene.