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Nitroxide Radical/Quinone Methide as Antifoulant in the Crude Oil Process

IP.com Disclosure Number: IPCOM000249040D
Publication Date: 2017-Jan-27
Document File: 3 page(s) / 18K

Publishing Venue

The IP.com Prior Art Database

Related People

Hua Mo: INVENTOR [+3]

Abstract

This invention is to be used as antifoulant in the crude oil process. Quinone Methide will be used as a scavenger. Nitroxide radicals will be used to control chain propagation and convert mercaptan SH to disulfide.

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         Nitroxide Radical/Quinone Methide as Antifoulant in the Crude Oil Process

Abstract of the Invention

This invention is to be used as antifoulant in the crude oil process. Quinone Methide will be used as a scavenger. Nitroxide radicals will be used to control chain propagation and convert mercaptan SH to disulfide.

Description

Under the heat, free radicals will be generated from either cracking processes, (such as furnace and different distillation towers), self-initiated olefin-type free radicalization, or the stabilization effect of heteroatoms (such as sulfur derivatives (mercaptan and sulfide)). Besides free radicals, some olefin-type materials will also be generated. The presence of free radicals and olefins will form the fouling materials (foulant). If untreated, the foulant could decompose in the process and cause process issues. If the condition becomes more severe, the unit has to be shut down and cleaned due to losing throughput, safety concern and mechanical failure. Different Inhibitors will be needed to terminate the different free radical reactions.

The phenolic or the phenylenediamine derivatives are well known chemistry in the refinery. However, these reagents have slow kinetics to terminate the radical polymerization at a relatively low temperature. Sometimes, the reaction product will form additional insoluble materials, which may cause additional fouling issues. As an alternative, a Nitroxide Radical / Quinone Methide (QM) combo is proposed.

Nitroxide radicals have been used to trap different carbon centered radicals. At a relatively low temperature, the kinetic rate to terminate the free radical type fouling is very fast. Although the trapping components of nitroxide radical with free radical could decompose at a high temperature, the free radicals generated by the decomposition could be scavenged by the QM.

Compared with the con...