Processes for Treating Olefin Feedstreams and Related Oligomerization Processes
AssigneeExxonMobil Chemical Patents Inc.
InventorPaul Hamilton
Life of this patent
Estimating the term…
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 C3-C15 olefins, preferably, C3-C5 olefins, any isomer thereof, one or more paraffins having the same or different carbon number as the olefins, and mixtures thereof.
Claims12
-15. (canceled)
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.
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.
The process of claim 1, wherein the alkaline water has a pH of 8.0 or greater.
The process of claim 1, wherein the liquid contact the at least one feedstream in an amount of from 1 wt % to 100 wt %, preferably from 5 to 25 wt % based in the total weight of the feedstream.
The process of claim 1, wherein the process comprises a water to hydrocarbon mass ratio of from 0.05 to 0.75, preferably 0.13.
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.
The process of claim 1, wherein the at least one olefin feedstream comprises 10 wt ppm or more of nitrogen present from ammonia.
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.
The process of claim 1, wherein the contact occur in a single stage or in an extraction unit.
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.
The process of claim 1, wherein the catalyst comprises mineral acids, optionally, on a support material;
- zeolites;
- other aluminum silicates;
- acid ion exchange resins;
- or mixtures thereof.
Dependencies are inferred from the claim text.