Scale inhibitor used in cracked gasoline hydrogenation system

Abstract

The invention relates to a scale inhibitor used in a cracked gasoline hydrogenation system. The scale inhibitor can solve the technical problems, thus the scale inhibitor can well adapt to the complicated operating conditions of the cracked gasoline hydrogenation system, the generation of scale in the cracked gasoline hydrogenation system can be effectively inhibited, the scale adhered to the surface of the equipment can be dispersed in the material, the life of the hydrogenation catalyst can be prolonged and the operational cycle of the cracked gasoline hydrogenation equipment can be prolonged. The scale inhibitor of the invention comprises the following components by weight percent: 5-25% of metal-ion deactivator, 5-30% of antioxidant, 5-30% of radical scavenger, 5-35% of dispersant and35-60% of organic solvent. The preparation method of the scale inhibitor comprises the following steps: heating the raw materials, stirring, fully dissolving and mixing, and cooling.

Description

technical field [0001] The invention relates to a scale inhibitor, in particular to a scale inhibitor used for cracking gasoline hydrogenation system. Background technique [0002] In the ethylene industry, the pyrolysis gasoline hydrogenation unit is located between the ethylene unit and the aromatics extraction unit, playing a link between the preceding and the following. Pyrolysis gasoline is an important by-product of ethylene production, mainly containing C5-C9 fractions, of which aromatics (benzene, toluene and mixed xylenes, etc.) account for more than half, and are important raw materials for the production of aromatics. [0003] The pyrolysis gasoline hydrogenation process generally includes a pre-fractionation system and a hydrogenation system. The pre-fractionation system generally includes a decarburization five-tower and a decarburization nine-tower. Hydrogenation, and then the obtained hydrogenated gasoline (generally C6-C8 components) is sent to the aromatics...

AI Technical Summary

Problems solved by technology

[0005] However, these polymerization inhibitors are not developed for pyrolysis gasoline hydrogenation units, because pyrolysis gasoline not only contains a large amount of unsaturated compounds that are easy to polymerize and foul, but also includes a large amount of aliphatic dienes such as pentadiene compounds and styrene, Unsaturated aromatic hydrocarbon compounds such as indene, and contain metal ions such as nickel, iron and chromium, and water, and the tower equipment also contains these metals, so these unsaturated compounds will not only undergo free radical polymerization initiated by heat, but also undergo metal ions. Ion-initiated polymerization, especially in the presence of water, will accelerate the polymerization, and the composition of unsaturated compounds in pyrolysis gasoline is complex, so the polymerization inhibitors or scale inhibitors in the published literature are not suitable for Working condition of pyrolysis gasoline hydrogenation unit

If it is used in a pyrolysis gasoline hydrogenation unit, due to its poor adaptability, it cannot solve the fouling problem of the entire gasoline hydrogenation system well, and cannot meet the production requirements. Antiscalants for Hydrogen Systems

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