Process for simultaneous production of alcohols and oligomer product from hydrocarbon feed stock

Patent metadata

Field	Value
Publication number	US-10131589-B2
Application number	US-201514727307-A
Country	US
Kind code	B2
Filing date	Jun 1, 2015
Priority date	May 31, 2014
Publication date	Nov 20, 2018
Grant date	Nov 20, 2018

Abstract

The present invention relates to a process for production of oligomer products from olefinic C4 feed stocks comprising isobutene, butenes, butanes, butadienes and mixture thereof. Particularly, the present invention relates to a process for the preparation of oligomers using olefinic C4 feed stock in presence of tertiary butyl alcohol (TBA) and iso propyl alcohol (IPA).

First claim

We claim:

1. A process for iso-olefin oligomerization, the process comprising:
feeding a C4 feedstock comprising isobutene to an oligomerization reaction zone;
feeding a mixture of alcohols to the oligomerization reaction zone; and
oligomerizing the C4 feedstock comprising isobutene in the presence of an oligomerization catalyst to produce dimers,
wherein the mixture of alcohols is obtained in a first reaction zone a hydration zone operated at different conditions and catalysts, by:
(a) feeding an olefinic feedstock and water to the hydration reaction zone, wherein the water is added in a range of 14 to 19 wt % of feed; and
(b) conducting hydration of the olefinic feed stock in the presence of a hydration catalyst in the hydration reaction zone, wherein the constant percentage wetting of the hydration catalyst is maintained in the range of 70-90% of moisture holding capacity of the catalyst, to obtain a consistent yield of the mixture of alcohols which is directly routed to the oligomerization reaction zone.

2. The process as claimed in claim 1 , wherein the yield of dimer is obtained in the range of 60-78 wt % with the dimer selectivity of >90%.

3. The process as claimed in claim 1 , wherein the olefinic feedstock comprises the hydrocarbons having carbon number in the range of C3-C12.

4. The process as claimed in claim 3 , wherein the olefinic feedstock is selected from C4 feedstock comprising isobutene, propylene, or a mixture thereof.

5. The process as claimed in claim 1 , wherein the C4 feedstock comprises isobutene, butenes, butanes, butadienes and mixture thereof.

6. The process as claimed in claim 1 , wherein the product obtained in hydration reaction zone comprises tertiary butyl alcohol, iso propyl alcohol, secondary butyl alcohol and other C4 alcohols.

7. The process as claimed in claim 1 , the process further comprising:
fractionating the effluent into a fraction comprising dimers;
recycling a portion of said fraction comprising dimers into the hydration reaction zone, to obtain a product comprising tertiary butyl alcohol, iso propyl alcohol, C8 alcohols and unconverted dimers; and
feeding a portion of the product obtained to the oligomerization reaction zone to obtain trimers.

8. The process of claim 7 , wherein the amount of dimer recycled is in the range of 25-75 wt % of fresh feed.

9. The process of claim 7 , wherein the fraction comprising dimers comprises >90% dimers.

10. The process as claimed in claim 1 , wherein the catalyst used in the hydration reaction zone is a polymer based cation exchange resin having the concentration of acid sites less than 5 eq/kg, surface area less than 40 m 2 /g and average pore diameter of less than 250 Å.

11. The process as claimed in claim 1 , wherein the catalyst used in the oligomerization reaction zone is a polymer based cation exchange resin having concentration of acid sites greater than 5 eq/kg, surface area greater than 40 m 2 /g, average pore diameter greater than 250 Å and divinyl benzene content of 20 to 85 wt %.

Assignees

• Indian Oil Corp Ltd

Inventors

• Subramani Saravanan
• Manna Reshmi
• Varshney Pushkar
• Chopra Anju
• Bhattacharyya Debasis
• Kumar Brijesh
• Das Biswapriya
• Malhotra Ravinder Kumar

Classifications

• C07C2/28 Primary

  with ion-exchange resins · CPC title

• C07C29/04

  by hydration of carbon-to-carbon double bonds · CPC title

• C10L1/06

  for spark ignition · CPC title

• C10L1/1608

  Well defined compounds, e.g. hexane, benzene · CPC title

• C07C2531/08

  Ion-exchange resins · CPC title