Oxygenates-free C8-C12 aromatic hydrocarbon stream and a process for preparing the same

Patent metadata

Field	Value
Publication number	US-9725383-B2
Application number	US-201314389908-A
Country	US
Kind code	B2
Filing date	Apr 1, 2013
Priority date	Apr 3, 2012
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

Abstract

The present disclosure provides a process for separating oxygenates present in an aromatic hydrocarbon stream to obtain an oxygenates-free aromatic hydrocarbon stream. The process involves selectively removing oxygenates from the aromatic hydrocarbon stream by passing said stream through at least one zeolite based adsorbing material.

First claim

The invention claimed is:

1. A process for reduction of oxygenates present in C 8 to C 12 aromatic hydrocarbon stream, said process comprising the following steps:
i. passing said C 8 to C 12 aromatic hydrocarbon stream, having oxygenates ranging between 40 and 70 ppm, through a zeolite based adsorbing material selected from the group consisting of Zeolite-X, Zeolite-Y, VPI-5, SSZ, Zeolite beta, ZSM-12, MCM-22, ITQ-2, ITQ-5, and MCM-41, at a Liquid Hourly Space Velocity (LHSV) ranging from 0.3 per hour to 4 per hour and recovering a stream with reduced oxygenates ranging between 0.5 and 3 ppm, wherein the zeolite based adsorbing material is used until it is spent as a result of adsorbing oxygenates from the aromatic hydrocarbon stream to obtain spent zeolite based adsorbing material; and
ii. regenerating the spent zeolite based adsorbing material by passing a pre-determined portion of the recovered stream through the spent zeolite based adsorbing material to obtain a regenerated zeolite based adsorbing material.

2. The process as claimed in claim 1 , wherein the oxygenates include organic and inorganic oxygenates.

3. The process as claimed in claim 2 , wherein one of the inorganic oxygenates is water.

4. The process as claimed in claim 2 , wherein the organic oxygenates are selected from the group consisting of ketone, aldehyde and mixtures thereof.

5. The process as claimed in claim 1 , which comprises the following further step:
passing a slip stream containing reduced oxygenates through the spent zeolite based adsorbing material at Liquid Hourly Space Velocity of 0.5 per hour to 1 per hour.

6. The process as claimed in claim 1 , which includes the further step of feeding stream collected after regeneration of the adsorbing zeolite based material to the C 8 to C 12 aromatic hydrocarbon stream for reduction of oxygenates.

7. The process as claimed in claim 1 , which comprises the following step:
passing the C 8 to C 12 aromatic hydrocarbon stream through a first column containing the zeolite based adsorbing material at Liquid Hourly Space Velocity from 0.5 per hour to 4 per hour to obtain the recovered stream with reduced oxygenate content, passing a pre-determined portion of the recovered stream to a second column containing the spent zeolite based adsorbing material to regenerate the spent zeolite based adsorbing material and recovering the stream after it has regenerated the spent adsorbing material and recycling the recovered stream through the first column.

8. The process as claimed in claim 7 , wherein the C 8 to C 12 aromatic hydrocarbon stream is passed alternately through the first and the second column.

9. The process as claimed in claim 1 , wherein the pre-determined portion of the recovered stream is passed through the spent zeolite based adsorbing material at a temperature in the range of 20° C. to 300° C., at a pressure in the range of 1 atmospheres to 20 atmospheres, and at a Liquid Hourly Space Velocity in the range of 0.1 h −1 to 20 h −1 .

Assignees

• Reliance Ind Ltd

Inventors

• Jasra Rakshvir
• Kumar Prakash
• Das Jagannath
• Sebastian Jince

Classifications

• C07C7/13 Primary

  by molecular-sieve technique · CPC title

• C10G25/03

  with crystalline alumino-silicates, e.g. molecular sieves · CPC title

• C10G2300/1096

  Aromatics or polyaromatics · CPC title

• C10G2400/30

  Aromatics · CPC title

• C07C15/02

  Monocyclic hydrocarbons · CPC title