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Method and apparatus for vapor liquid separation of a crude oil residue in a knockout drum and recycling the drum bottoms to a cracking oven

A separation tank and recirculation technology, applied in the treatment of hydrocarbon oil, petroleum industry, preparation of liquid hydrocarbon mixture, etc., can solve problems such as line and container fouling

Inactive Publication Date: 2015-04-01
EXXONMOBIL CHEM PAT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the resulting vaporized heavier components tend to partially condense in the overhead vapor phase, causing fouling of lines and vessels downstream of the flash / snap tank top outlet

Method used

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  • Method and apparatus for vapor liquid separation of a crude oil residue in a knockout drum and recycling the drum bottoms to a cracking oven
  • Method and apparatus for vapor liquid separation of a crude oil residue in a knockout drum and recycling the drum bottoms to a cracking oven

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[0096] Table 1 below contains data calculated from a model that assumed a conservative estimate of 38% gasification of the ever-recirculated bottoms, but the model predicted that 38% to 50% of the ever-recirculated bottoms would gasification.

[0097] Table 1

[0098]

[0099] In a continuous process, the original bottoms deposit is recirculated multiple times before exiting the process. Each time, a smaller amount of bottoms vaporized while the remaining bottoms, as measured by the modified naphtha insolubles (MNI) test, became more heat resistant. Table 1 shows how the net fraction (or % vaporized) increases as the recycle flow increases. Table 1 also shows the predicted concentration of MNI in the mixed feedstock and bottoms. In these examples, it is assumed that fresh feedstock contains 1% MNI.

[0100] Also of interest is the highest concentration of refractory oil in the bottoms. Models predict that each recirculation operation increases MNI concentration by appr...

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Abstract

A process and apparatus for cracking a hydrocarbon feed in a steam cracking furnace by withdrawing a resid-rich stream from a resid knockout vessel and recycling the resid-rich stream through a convection heating section of the furnace.

Description

[0001] cross reference [0002] This application claims priority to US nonprovisional application Serial No. 12 / 474,801, filed May 29, 2009, which is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates to a process for cracking hydrocarbon feedstocks in a steam cracking furnace by recycling resid oil extracted from a resid knockout drum. Background technique [0004] Steam cracking - also known as pyrolysis - has long been used to crack various hydrocarbon feedstocks into olefins, preferably light olefins such as ethylene, propylene and butenes. Traditional steam cracking utilizes a pyrolysis furnace that has two main sections: a convective heating zone and a radiant (or "pyrolysis") zone. Typically, the hydrocarbon feedstock enters the convective heating zone of the furnace in liquid form (except light feedstocks, which enter in vapor form), where the hydrocarbon feedstock is heated by indirect contact with hot flue gase...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C4/04C10G1/00
CPCC10G2300/802C10G2300/807C10G9/20
Inventor R·C·斯特尔D·B·斯派塞G·斯蒂芬斯
Owner EXXONMOBIL CHEM PAT INC