Processes for treating olefin feedstreams and related oligomerization processes

Patent metadata

Field	Value
Publication number	US-9505674-B2
Application number	US-201314647728-A
Country	US
Kind code	B2
Filing date	Nov 8, 2013
Priority date	Nov 29, 2012
Publication date	Nov 29, 2016
Grant date	Nov 29, 2016

Abstract

Embodiments disclosed herein relate to a process for the oligomerization of olefins, the process including at least one olefin feedstream that includes ammonia and contacting the at least one olefin feedstream with a liquid including alkaline water to remove at least a portion of the ammonia to produce at least one treated olefin feedstream and subsequently contacting the at least one treated olefin feedstream with a catalyst under oligomerization conditions to produce an oligomer product. In several embodiments disclosed herein, the at least one olefin feedstream includes one or more C 3 -C 15 olefins, preferably, C 3 -C 5 olefins, any isomer thereof, one or more paraffins having the same or different carbon number as the olefins, and mixtures thereof.

First claim

What is claimed is:

1. A process for the oligomerization of olefins, the process comprising providing at least one olefin feedstream that comprises 45 wt % or more combined propylene and propane based upon the total weight of the feedstream, and 5 ppm or more nitrogen from ammonia, contacting the at least one olefin feedstream with a liquid comprising alkaline water having a pH of from 7.5 to 10.5 to remove at least a portion of the ammonia to produce at least one treated olefin feedstream comprising 1 wt ppm or less nitrogen from ammonia and subsequently contacting the at least one treated olefin feedstream with a catalyst under oligomerization conditions to produce an oligomer product.

2. The process of claim 1 , wherein the at least one olefin feedstream comprises propylene and propane and wherein the at least one olefin feedstream comprises 60 wt % or more combined propylene and propane, based upon the total weight of the feedstream.

3. The process of claim 1 , wherein the alkaline water has a pH of 8.0 to 10.5.

4. The process of claim 1 , wherein the liquid contacting of the at least one feedstream is in an amount of from 1 wt % to 100 wt %, based in the total weight of the feedstream.

5. The process of claim 1 , wherein the process comprises a water to a hydrocarbon mass ratio of from 0.05 to 0.75, preferably 0.13.

6. The process of claim 1 , wherein the process comprises a 20:1 or greater reduction of ammonia after contacting the at least one olefin feedstream with the liquid.

7. The process of claim 1 , wherein the at least one olefin feedstream comprises 10 wt ppm or more of nitrogen present from ammonia.

8. The process of claim 1 , wherein the at least one treated olefin feedstream comprises 0.2 wt ppm or less of nitrogen present from ammonia.

9. The process of claim 1 , wherein the contacting occurs in a single stage or in an extraction unit.

10. The process of claim 1 , wherein the liquid contacts the feed counter-currently in a column containing flow-distribution media such as tray or packing.

11. The process of claim 1 , wherein the catalyst comprises mineral acids, zeolites, aluminum silicates, acid ion exchange resins, or mixtures thereof.

12. The process of claim 11 , wherein the mineral acid is on a support material.

Assignees

• Exxonmobil Chemical Patents Inc

Inventors

• Hamilton Paul

Classifications

• C07C7/10

  by extraction, i.e. purification or separation of liquid hydrocarbons with the aid of liquids · CPC title

• C10G3/00

  Production of liquid hydrocarbon mixtures from oxygen-containing organic materials, e.g. fatty oils, fatty acids (production from non-melting solid oxygen-containing carbonaceous materials C10G1/00) · CPC title

• Y02P30/20

  using bio-feedstock · CPC title

• C07C2/08 Primary

  Catalytic processes · CPC title

• C07C11/06

  Propene · CPC title