Process and apparatus for selectively hydrogenating naphtha

Patent metadata

Field	Value
Publication number	US-9393538-B2
Application number	US-201414511942-A
Country	US
Kind code	B2
Filing date	Oct 10, 2014
Priority date	Oct 10, 2014
Publication date	Jul 19, 2016
Grant date	Jul 19, 2016

Abstract

The process and apparatus of the present invention selectively hydrogenates a heavier olefinic naphtha stream in an upstream catalyst bed and the hydrogenated effluent and a lighter olefinic naphtha stream in a downstream catalyst bed. The heavier di-alkenes are less re-active and are contacted with more hydrogenation catalyst than the lighter di-alkenes which are more re-active.

First claim

The invention claimed is:

1. An apparatus for selective hydrogenation comprising:
a fractionation column for producing a lighter naphtha stream at a lighter outlet and a heavy naphtha stream at a second outlet at a location in the column below the lighter outlet, and an overhead outlet at a location in the column above the lighter outlet;
a selective hydrogenation reaction zone having a first inlet in downstream communication with the second outlet and a second inlet downstream of the first inlet and in downstream communication with the lighter outlet; and
a overhead selective hydrogenation reaction zone in downstream communication with the overhead outlet and wherein said fractionation column is in downstream communication with said overhead selective hydrogenation reaction zone.

2. The apparatus of claim 1 further comprising a mercaptan reactor in upstream communication with the fractionation column, said mercaptan reactor being in downstream communication with a source of alkaline.

3. The apparatus of claim 1 wherein said first inlet and said second inlet to said selective hydrogenation reaction zone are in the same vessel.

4. The apparatus of claim 1 further comprising an overhead mercaptan reactor in downstream communication with said overhead outlet.

5. The apparatus of claim 1 further comprising a hydrodesulfurization reactor downstream of said selective hydrogenation reaction zone.

6. An apparatus for selective hydrogenation comprising:
a fractionation column for producing an overhead naphtha stream at an overhead outlet, a lighter naphtha stream at a lighter outlet and a heavy naphtha stream at a second outlet at a location in the column below the lighter outlet, wherein the overhead outlet is at a location in the column above the lighter outlet;
a selective hydrogenation reaction zone having a first inlet in downstream communication with the second outlet and a second inlet downstream of the first inlet and in downstream communication with the lighter outlet, wherein said first inlet and said second inlet to said selective hydrogenation reaction zone are in the same vessel; and
an overhead selective hydrogenation reaction zone in downstream communication with the overhead outlet and wherein said fractionation column is in downstream communication with said overhead selective hydrogenation reaction zone.

7. The apparatus of claim 6 further comprising a mercaptan reactor in upstream communication with the fractionation column, said reactor being in downstream communication with a source of alkaline.

8. The apparatus of claim 6 further comprising an overhead mercaptan reactor in downstream communication with said overhead outlet.

9. The apparatus of claim 6 further comprising a hydrodesulfurization reactor downstream of said selective hydrogenation reaction zone.

10. An apparatus for selective hydrogenation comprising:
a mercaptan reactor being in downstream communication with a source of alkaline;
a fractionation column in downstream communication with said mercaptan reactor for producing a lighter naphtha stream at a lighter outlet and a heavy naphtha stream at a second outlet at a location in the column below the lighter outlet and an overhead outlet at a location in the column above the lighter outlet; and
a selective hydrogenation reaction zone having a first inlet in downstream communication with the second outlet and a second inlet downstream of the first inlet and in downstream communication with the lighter outlet; and
an overhead selective hydrogenation reaction zone in downstream communication with the overhead outlet and said fractionation column is in downstream communication with said overhead selective hydrogenation reaction zone.

11. The apparatus of claim 10 further comprising a hydrodesulfurization reactor downstream of said selective hydrogenation reaction zone.

Assignees

• Uop Llc

Inventors

• Kumar Avnish
• Zink Steven F
• Banerjee Soumendra M

Classifications

• B01J8/0453

  the beds being superimposed one above the other · CPC title

• C10G49/002

  Apparatus for fixed bed hydrotreatment processes · CPC title

• C10G67/10

  including alkaline treatment as the refining step in the absence of hydrogen · CPC title

• B01J8/0449 Primary

  in two or more cylindrical beds · CPC title

• C10G65/02

  plural serial stages only · CPC title