Hydrocarbon conversion process

Patent metadata

Field	Value
Publication number	US-9969941-B2
Application number	US-201615196771-A
Country	US
Kind code	B2
Filing date	Jun 29, 2016
Priority date	Sep 23, 2011
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

The invention relates to a process for converting hydrocarbons into unsaturated products such as acetylene and/or ethylene. The invention also relates to converting acetylene to olefins such as ethylene and/or propylene, to polymerizing the olefins, and to equipment useful for these processes.

First claim

The invention claimed is:

1. A process for removing combustible non-volatiles from a reactor system, comprising:
(A) depositing combustible non-volatiles by pyrolysis at a temperature ≥800° C. of hydrocarbon comprising alkane during a pyrolysis step of duration t 1 , wherein (a) the combustible non-volatiles are deposited in first and second conduits of a first reactor, (b) the first reactor is located within the reactor system, and (c) the pyrolysis converts at least a portion of the alkane to unsaturated hydrocarbon in the first reactor;
(B) during a first time interval having a duration t 2a of a heating step having a total duration t 2 ,
(a) conducting a fuel through the first conduit and an oxidant through the second conduit,
(b) heating the reactor system by combusting at least a portion of the oxidant with (i) at least a portion of the combustible non-volatiles located in the second conduit and (ii) at least a portion of the fuel; and
(C) during a second time interval having a duration t 2b of the heating step, wherein t 2a +t 2b ≤t 2 ,
(a) conducting at least a portion of the oxidant through the first conduit,
(b) reacting the oxidant with at least a portion of the combustible non-volatiles located in the first conduit,
(c) conducting the fuel through a third conduit of the first reactor,
(d) conducting a second portion of the oxidant through the second conduit, and
(e) heating the reactor system by combusting at least a portion of the oxidant with (i) at least a portion of the combustible non-volatiles located in the first and/or second conduits and (ii) at least a portion of the fuel; wherein the first, second, and third conduits comprise at least one channel in a reactor bed.

2. The process of claim 1 , wherein t 1 is the range of 0.1 seconds to 10.0 seconds.

3. The process of claim 1 , wherein t 2 is in the range of 0.1 seconds to 10.0 seconds.

4. The process of claim 1 , wherein t 2a is substantially the same as t 2b .

5. The process of claim 1 , wherein the heating steps (B) and (C) together heat at least part of the reactor system to a temperature ≥800° C. for the pyrolysis.

6. The process of claim 5 , wherein step (A) further comprises:
transferring at least a portion of the unsaturated hydrocarbon away from the reactor via the first and second conduits, wherein at least a portion of the depositing of the combustible non-volatiles occurs during the transfer.

7. The process of claim 6 , further comprising repeating steps (A)-(C).

Assignees

• Exxonmobil Chemical Patents Inc

Inventors

• Hershkowitz Frank
• Keusenkothen Paul F
• Frederick Jeffrey W
• Basile Richard J
• Fulton John W

Classifications

• B01J2219/2411

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• C07C5/35

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• C10B23/00

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• C10G9/16 Primary

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