Process and apparatus for purifying a hydrocarbon stream comprising linear alpha-olefins (lao) from amines

Patent metadata

Field	Value
Publication number	US-2016332957-A1
Application number	US-201515112543-A
Country	US
Kind code	A1
Filing date	Jan 19, 2015
Priority date	Jan 20, 2014
Publication date	Nov 17, 2016
Grant date	—

Abstract

A process for purifying linear a-olefins, comprises: providing an organic phase comprising a linear a-olefin; providing an alkaline aqueous phase I; providing an amine; mixing the linear a-olefin, alkaline aqueous phase I, and amine; separating the aqueous phase I from the organic phase; adding water to the organic phase thereby forming an aqueous phase II; bringing into contact the organic phase with carbon dioxide; separating the aqueous phase II which comprises a solid formed in the organic phase when contacted with carbon dioxide; wherein the purified linear a-olefins are obtained in the organic phase.

First claim

1 . A process for purifying linear a-olefins, comprising:
providing an organic phase comprising a linear a-olefin; providing an alkaline aqueous phase I; providing an amine; mixing the linear a-olefin, alkaline aqueous phase I, and amine; separating the aqueous phase I from the organic phase; adding water to the organic phase thereby forming an aqueous phase II; bringing into contact the organic phase with carbon dioxide; separating the aqueous phase II which comprises a solid formed in the organic phase when contacted with carbon dioxide; wherein the purified linear a-olefins are obtained in the organic phase.

2 . The process of claim 1 , wherein at least the bringing into contact the organic phase with carbon dioxide is performed at a pressure in the range of more than 2.0 MegaPascals.

3 . The process of claim 1 , wherein the process is performed as a continuous process.

4 . The process of claim 1 , wherein the amine is an organic amine selected from a primary, secondary, tertiary or cyclic amine.

5 . The process of claim 4 , wherein the organic amine is selected from t-butyl amine, triethyl amine, cyclopentyl amine, t-octyl amine, n-heptyl amine, 2-heptyl amine, hexyl amine, 2-ethylhexyl amine, dihexyl amine, 1,6-diamino hexane, tributyl amine, 1,8-diamino octane, n-dodecyl amine, 3-ethyIheptyl amine and tris-2-ethyl hexyl amine.

6 . The process of claim 1 , wherein the organic phase comprises at least one component which is non-polar.

7 . The process of claim 6 , wherein the organic phases further comprises at least one organic solvent selected from aromatic and aliphatic solvents.

8 . The process of claim 7 , wherein the organic solvent is toluene or cyclohexane.

9 . The process of claim 1 , wherein the linear a-olefin is obtained by oligomerizing ethylene.

10 . The process of claim 1 , further comprising a process for purifying amines and carbon dioxide from amine-carbon dioxide complexes, comprising:
providing an aqueous phase II comprising at least one complex of an amine and carbon dioxide, and a gas phase; heating the aqueous phase II; disintegrating the complex into at least an amine and carbon dioxide, wherein the carbon dioxide passes from the aqueous phase II into gas phase; wherein an aqueous phase II′ is formed comprising more amine than carbon dioxide; and wherein the gas phase comprises more carbon dioxide than amine.

11 . The process of claim 10 , wherein at least the heating of the aqueous phase II is performed at a pressure in of more than 2.0 MegaPascals.

12 . The process of claim 10 , wherein the heating of the aqueous phase II is performed until the temperature of the aqueous phase II is 80-100° C.

13 . The process of claim 10 , wherein at least some water is removed from the aqueous phase II′, wherein an amine enriched aqueous phase II″ is obtained.

14 . The process of claim 10 , wherein the process is a continuous process.

15 . A process for preparing linear a-olefins, comprising:
providing an organic phase comprising at least ethylene and a catalyst; oligomerizing the ethylene wherein an organic phase comprising a linear a-olefin is obtained forming a compound (a); providing an alkaline aqueous phase I forming a compound (b); providing an amine forming a compound (c); mixing the compounds (a), (b), and (c); separating the aqueous phase I from the organic phase; adding water to the organic phase thereby forming an aqueous phase II; bringing into contact the organic phase with carbon dioxide at a pressure of 2.0 to 3.0 MegaPascals; separating the aqueous phase II which comprises a solid formed in the organic phase when brought into contact with carbon dioxide at a pressure of 2.0 to 3.0 MegaPascals; wherein the purified linear a-olefins are obtained in the organic phase; heating the aqueous phase II to 80-100° C. at a pressure of 2.0 to 3.0 MegaPascals; disintegrating the complex into at least an amine and carbon dioxide, wherein the carbon dioxide passes from the aqueous phase II into gas phase; wherein the aqueous phase II contains more amine than carbon dioxide, and wherein the gas phase comprises more carbon dioxide than amine.

16 . The process of claim 15 , further comprising removing at least some water from the aqueous phase II, wherein an amine enriched phase II is obtained.

17 . The process of claim 15 , wherein the process is a continuous process.

18 . An apparatus, comprising:
a reactor having at least one feed and at least one outlet, wherein the product outlet is in serial fluid connection with a mixer, wherein at least two feeds are placed downstream of reactor but upstream of mixer; a decanter downstream of mixer with outlets; a decanter downstream of decanter, with outlets; at least a feed downstream of decanter but upstream or directly attached to decanter; and a heating device in fluid connection with outlet, wherein the heating device has a gas outlet in fluid connection with an inlet of decanter, and wherein the heating device has a liquid outlet in fluid connection with a decanter, wherein the decanter is in fluid connection with outlet and an outlet wherein outlet is in fluid connection with a pump, and wherein the pump is in fluid connection with the feed.

Assignees

• Saudi Basic Ind Corp

Inventors

• Hashmi Syed Azhar
• Al-Hazmi Mohammed H
• Azam Shahid

Classifications

• B01D11/0446

  Juxtaposition of mixers-settlers · CPC title

• C07C7/152

  by forming adducts or complexes · CPC title

• C07C209/84 Primary

  Purification · CPC title

• B01D11/0492

  Applications, solvents used · CPC title

• C07C2/08 Primary

  Catalytic processes · CPC title