US 8,507,742 B2Granted

Process for producing olefins

AssigneeShell Oil Company

InventorsLeslie Andrew Chewter, Herve Henry, Jeroen Van Westrenen

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Abstract

The present invention provides a process for producing olefins from a feed comprising at least methane, ethane and carbon dioxide. The feed is separated into at least a methane-comprising feed, an ethane-comprising feed and a carbon dioxide-comprising feed. At least part of the methane-comprising feed is converted to a synthesis gas. The ethane-comprising feed is cracked to obtain at least olefins and hydrogen. At least part of the carbon dioxide-comprising feed and at least part of the synthesis gas are used to synthesis oxygenates. At least part of the oxygenates are converted in an oxygenate-to-olefin (OTO) zone to obtain at least olefins and hydrogen. At least part of the cracking effluent and at least part of the OTO zone effluent are combined to obtain a combined effluent from which hydrogen is separated. At least part of the hydrogen is supplied to the oxygenate synthesis zone.

Claims8

Dependent claims

A process for producing olefins, comprising:

a. providing a feed comprising at least methane, ethane and carbon dioxide;
b. separating the feed into at least a methane-comprising feed, an ethane-comprising feed and a carbon dioxide-comprising feed;
c. providing at least part of the methane-comprising feed to a process for preparing synthesis gas to obtain a synthesis gas;
d. cracking the ethane-comprising feed in a cracking zone under cracking conditions to obtain a cracking zone effluent comprising at least olefins and hydrogen;
e. providing at least part of the carbon dioxide-comprising feed and at least part the synthesis gas obtained in step c) to an oxygenate synthesis zone and synthesising oxygenates;
f. converting at least part of the oxygenates obtained in step (e) in an oxygenate-to-olefin zone to obtain an oxygenate-to-olefin zone effluent comprising at least olefins and hydrogen;
g. combining at least part of the cracking zone effluent and at least part of the OTO zone effluent to obtain a combined effluent;
h. separating hydrogen from the combined effluent and providing at least part of the hydrogen to the oxygenate synthesis zone in step (e).

5 more elements

An integrated system for producing olefins, which system comprises:

a. a separation system, having at least an inlet for a feed comprising methane, ethane and carbon dioxide, and an outlet for a methane-comprising feed, an outlet for an ethane-comprising feed and an outlet for a carbon dioxide-comprising feed;
b. a partial oxidation system arranged to partially oxidise the methane-comprising feed to a synthesis gas, having an inlet for a methane-comprising feed to receive the methane-comprising feed from the separation system, an inlet for oxygen, and an outlet for synthesis gas;
c. a steam cracking system having one or more inlets for an ethane-comprising feed to receive the methane-comprising feed from the separation system and an inlet for steam, and an outlet for a cracker effluent comprising olefins;
d. an oxygenate-to-olefins conversion system, having one or more inlets for receiving an oxygenate feedstock, and comprising a reaction zone for contacting the oxygenate feedstock with an oxygenate conversion catalyst under oxygenate conversion conditions, and an outlet for an oxygenate-to-olefins effluent comprising olefins, including at least ethylene;
e. a work-up system arranged to receive at least part of the cracker effluent and at least part of the oxygenate-to-olefins effluent to obtain a combined effluent, the work-up section comprising a separation system, an outlet for ethylene and an outlet for hydrogen;
and
f. an oxygenate synthesis system having one or more inlets for synthesis gas to receive the synthesis gas from the partial oxidation system, an inlet for hydrogen and an inlet for a carbon dioxide-comprising feed to receive the carbon dioxide-comprising feed from the separation system, and an outlet for an oxygenate feedstock;
and means for providing the oxygenate feedstock from the outlet for oxygenate feedstock of the oxygenate synthesis system to the oxygenate feedstock inlet of the oxygenate-to-olefins conversion system and means for providing hydrogen from the outlet for hydrogen of the work-up section to the inlet for hydrogen of the oxygenate synthesis system.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/942,869Filed 9 Nov 2010
Priority: EP 0917560710 Nov 2009
Published: US 2011/0137095 A19 Jun 2011
Granted: 13 Aug 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification26 codes

C10G 57/00
Treatment of hydrocarbon oils, in the absence of hydrogen, by at least
C01B 3/24
By decomposition of gaseous or liquid organic compounds: of hydrocarbons
C01B 3/36
By reaction of hydrocarbons with gasifying agents: using oxygen; using mixtures containing oxygen as gasifying agents
C01B 3/38
By reaction of hydrocarbons with gasifying agents: using catalysts