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1. US20070007174 - Method for processing hydrocarbon pyrolysis effluent

Office United States of America
Application Number 11178037
Application Date 08.07.2005
Publication Number 20070007174
Publication Date 11.01.2007
Grant Number 08524070
Grant Date 03.09.2013
Publication Kind B2
IPC
C CHEMISTRY; METALLURGY
10
PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
G
CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
9
Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils
C10G 9/00
Applicants Strack Robert David
ExxonMobil Chemical Patents Inc.
Messinger John R.
Inventors Strack Robert David
Messinger John R.
Priority Data 11178037 08.07.2005 US
Title
(EN) Method for processing hydrocarbon pyrolysis effluent
Abstract
(EN)

A method and apparatus are disclosed for treating the effluent from a hydrocarbon pyrolysis unit employing a small primary fractionator, i.e., a rectifier. The method comprises cooling the gaseous effluent, e.g., by direct quench and/or at least one primary heat exchanger, and then cooling the gaseous effluent to a temperature at which tar, formed by reactions among constituents of the effluent, condenses, e.g., in a secondary exchanger. The resulting mixed gaseous and liquid effluent is passed through a rectifier, to cleanly separate quench oil from the gaseous effluent comprising a pyrolysis gasoline fraction, whose boiling point can be lowered as a result of the rectifier treatment. The effluent is then cooled to condense a liquid effluent comprising pyrolysis gasoline and water condensed from steam, which fractions are separated in a distillate drum. The cooled gaseous effluent is directed to a recovery train to recover light olefins. At least a portion of the pyrolysis gasoline-containing fraction can be recycled to the rectifier to enhance separation of the quench oil from the pyrolysis gasoline fraction.

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