Hydrogenation Using Highly Selective Catalyst

Patent metadata

Field	Value
Publication number	US-2016355449-A1
Application number	US-201514733595-A
Country	US
Kind code	A1
Filing date	Jun 8, 2015
Priority date	Jun 8, 2015
Publication date	Dec 8, 2016
Grant date	—

Abstract

A process comprising hydrogenating a highly unsaturated hydrocarbon in the presence of a first hydrogenation catalyst and a second hydrogenation catalyst to one or more compounds including an unsaturated hydrocarbon such that a total conversion of the highly unsaturated hydrocarbon is about 99 mol % or greater. In the process, the first hydrogenation catalyst, the second hydrogenation catalyst, or both, have a hydrogenation selectivity to the unsaturated hydrocarbon of about 90% or greater.

First claim

What is claimed is:

1 . A process comprising:
hydrogenating a highly unsaturated hydrocarbon in the presence of a first hydrogenation catalyst to yield an unsaturated hydrocarbon, a saturated hydrocarbon, and an unconverted highly unsaturated hydrocarbon, wherein a conversion of the highly unsaturated hydrocarbon to the unsaturated hydrocarbon and the saturated hydrocarbon in the presence of the first hydrogenation catalyst is about 90 mol % or greater; and hydrogenating the unconverted highly unsaturated hydrocarbon in the presence of a second hydrogenation catalyst to yield the unsaturated hydrocarbon and the saturated hydrocarbon, and the unconverted highly unsaturated hydrocarbon, wherein a total conversion of the highly unsaturated hydrocarbon to the unsaturated hydrocarbon and the saturated hydrocarbon after hydrogenation in the presence of the first hydrogenation catalyst and after hydrogenation in the presence of the second hydrogenation catalyst is about 99 mol % or greater; wherein the first hydrogenation catalyst, the second hydrogenation catalyst, or both, have a hydrogenation selectivity to the unsaturated hydrocarbon of about 90% or greater based on the moles of the highly unsaturated hydrocarbon which are converted.

2 . The process of claim 1 , further comprising:
flowing a first effluent stream comprising the unsaturated hydrocarbon, the saturated hydrocarbon, and the unconverted highly unsaturated hydrocarbon from the first hydrogenation catalyst to the second hydrogenation catalyst, wherein no heat is added to the first effluent stream.

3 . The process of claim 1 , further comprising:
flowing a first effluent stream comprising the unsaturated hydrocarbon, the saturated hydrocarbon, and the unconverted highly unsaturated hydrocarbon from the first hydrogenation catalyst to the second hydrogenation catalyst, wherein a first temperature of the first effluent stream as the first effluent stream flows into the second hydrogenation catalyst is the same as or lower than a second temperature of the first effluent stream as the first effluent stream flows from the first hydrogenation catalyst.

4 . The process of claim 1 , wherein the highly unsaturated hydrocarbon comprises acetylene, wherein the unsaturated hydrocarbon comprise ethylene, and wherein the saturated hydrocarbon comprises ethane.

5 . The process of claim 1 , wherein the highly unsaturated hydrocarbon comprises methylacetylene, propadiene, or both; wherein the unsaturated hydrocarbon comprises propylene; and wherein the saturated hydrocarbon comprises propane.

6 . The process of claim 1 , further comprising:
cracking a feed stream to produce a cracked gas stream comprising the highly unsaturated hydrocarbon, the unsaturated hydrocarbon, and the saturated hydrocarbon.

7 . The process of claim 6 , wherein the cracked gas stream comprises from about 10 ppm to about 20,000 ppm of the highly unsaturated hydrocarbon based on the total weight of all hydrocarbons in the cracked gas stream.

8 . The process of claim 6 , further comprising:
fractionating the cracked gas stream to yield a C 2 − stream comprising the highly unsaturated hydrocarbon, the unsaturated hydrocarbon, and the saturated hydrocarbon, wherein at least a portion of the highly unsaturated hydrocarbon in the C 2 − stream is hydrogenated in the presence of the first and the second hydrogenation catalysts.

9 . The process of claim 8 , further comprising:
separating the unsaturated hydrocarbon from the saturated hydrocarbon after hydrogenation of the highly unsaturated hydrocarbon.

10 . The process of claim 6 , further comprising:
fractionating the cracked gas stream to yield a C 3 − stream comprising the highly unsaturated hydrocarbon, the unsaturated hydrocarbon, and the saturated hydrocarbon, wherein at least a portion of the highly unsaturated hydrocarbon in the C 3 − stream is hydrogenated in the presence of the first and the second hydrogenation catalysts.

11 . The process of claim 6 , further comprising:
fractionating the cracked gas stream to yield a C 2 + stream comprising the highly unsaturated hydrocarbon, the unsaturated hydrocarbon, and the saturated hydrocarbon; and fractionating the C 2 + stream to yield a C 2 − stream comprising the highly unsaturated hydrocarbon, the unsaturated hydrocarbon, and the saturated hydrocarbon, wherein at least a portion of the highly unsaturated hydrocarbon in the C 2 − stream is hydrogenated in the presence of the first and the second hydrogenation catalysts.

12 . The process of claim 6 , wherein at least a portion of the highly unsaturated hydrocarbon in the cracked gas stream is hydrogenated in the presence of the first and the second hydrogenation catalysts.

13 . The process of claim 1 , wherein the step of hydrogenating the highly unsaturated hydrocarbon comprises:
contacting the first hydrogenation catalyst with at least a portion of the highly unsaturated hydrocarbon in the presence of hydrogen;
wherein the step of hydrogenating the unconverted highly saturated hydrocarbon comprises:
contacting the second hydrogenation catalyst with at least a portion of the unconverted highly unsaturated hydrocarbon in the presence of hydrogen.

14 . A system comprising:
a hydrocarbon stream comprising a highly unsaturated hydrocarbon, an unsaturated hydrocarbon, and optionally, a saturated hydrocarbon; a first reaction zone comprising a first hydrogenation catalyst, wherein the hydrocarbon stream contacts the first hydrogenation catalyst in the first reaction zone, and wherein at least a portion of the highly unsaturated hydrocarbon from the hydrocarbon stream is hydrogenated in the first reaction zone; and a second reaction zone comprising a second hydrogenation catalyst, wherein the second reaction zone receives a first effluent stream comprising the unsaturated hydrocarbon, an unconverted highly unsaturated hydrocarbon, and optionally, the saturated hydrocarbon from the first reaction zone, wherein at least a portion of the unconverted highly unsaturated hydrocarbon is hydrogenated in the second reaction zone; wherein a conversion of the highly unsaturated hydrocarbon to the unsaturated hydrocarbon and the saturated hydrocarbon after hydrogenation in the first reaction zone is about 90 mol % or greater based on moles of the highly unsaturated hydrocarbon in the hydrocarbon stream, wherein a total conversion of the highly unsaturated hydrocarbon to the unsaturated hydrocarbon and the saturated hydrocarbon after hydrogenation in the first and the second reaction zones is about 99 mol % or greater based on moles of the highly unsaturated hydrocarbon in the hydrocarbon stream, and wherein the first hydrogenation catalyst, the second hydrogenation catalyst, or both have a hydrogenation selectivity to the unsaturated hydrocarbon of about 90 mol % or greater based on the moles of highly unsaturated hydrocarbon which are converted.

15 . The system of claim 14 , further comprising:
a first effluent stream comprising the unsaturated hydrocarbon, the saturated hydrocarbon, and the unconverted highly unsaturated hydrocarbon, wherein the first effluent stream flows from the first reaction zone to the second reaction zone, wherein no heat is added to the first effluent stream between the first reaction zone and the second reaction zone.

16 . The system of claim 15 , wherein a first temperature of the first effluent stream as the first effluent stream flows into the second reaction zone is the same as or lower than a second temperature of the first effluent str

Assignees

• Chevron Phillips Chemical Co Lp

Inventors

• Odi Timothy O
• Hong Zongxuan
• Bergmeister Iii Joseph
• Cheung Tin-Tack Peter
• Nolidin Charles D
• Gonzales Thomas J
• Nill Jennifer L
• Dockter David W

Classifications

• C07C5/05 Primary

  Partial hydrogenation · CPC title

• C07C4/02

  by cracking a single hydrocarbon or a mixture of individually defined hydrocarbons or a normally gaseous hydrocarbon fraction · CPC title

• C07C5/09 Primary

  to carbon-to-carbon double bonds · CPC title

• C07C5/08

  of carbon-to-carbon triple bonds · CPC title

• Y02P20/52

  using catalysts, e.g. selective catalysts · CPC title