Single step catalytic process for the conversion of n-paraffins and naphtha to diesel range hydrocarbons

Patent metadata

Field	Value
Publication number	US-9598649-B2
Application number	US-201314441379-A
Country	US
Kind code	B2
Filing date	Nov 11, 2013
Priority date	Nov 9, 2012
Publication date	Mar 21, 2017
Grant date	Mar 21, 2017

Abstract

The present invention discloses a single step catalytic process for the conversion of n-paraffins and naphtha to diesel range hydrocarbons. A bi-metallic Pt—Sn/ZSM-5 catalyst has been developed for the direct conversion of n-heptane as well as naphtha into diesel range hydrocarbons in a single step process.

First claim

The invention claimed is:

1. A single step catalytic process for the conversion of n-paraffins and naphtha (90-140° C.) to diesel range hydrocarbons using Pt—Sn-ZSM-5 catalyst, wherein the said process comprises loading of Pt—Sn-ZSM-5 catalyst in a reactor followed by reducing the catalyst using hydrogen at 500-600° C. for 6-10 h with 6-16 l/h hydrogen gas flow further, introducing the feed in a continuous flow rate 2-10 h −1 WHSV (weight hourly space velocity) at temperatures ranging between 400° C.-450° C. with a carrier gas, at flow rate 5-50 l/h at pressure ranging between 2-30 bar to obtain liquid products and gas products, wherein liquid products are diesel range hydrocarbons and gasoline.

2. The process as claimed in claim 1 , wherein percentage of Pt and Sn in Pt—Sn-ZSM-5 catalyst is in the range of 0.1- to 1.0 wt % and 0.2 wt % to-1.6-wt % respectively.

3. The process as claimed in claim 1 , wherein catalyst bed is sandwiched between two layers of alpha alumina (inert binder material) for the mechanical support.

4. The process as claimed in claim 1 , wherein yield of diesel is in the range of 2 to 15 wt %.

5. The process as claimed in claim 1 , wherein yield of gasoline is in the range of 50 wt % to 80 wt %.

6. The process as claimed in claim 1 , wherein valuable bi-products LPG, olefins and hydrogen are also obtained.

7. The process as claimed in claim 1 , wherein the catalyst exhibits stable activity in terms of diesel yield for a minimum reaction time period of 40 h.

8. The process as claimed in claim 1 , wherein the carrier gas is nitrogen gas.

Assignees

• Council Scient Ind Res
• Council Scient Ind Res

Inventors

• Nagabhatla Viswanadham
• Peta Sreenivasulu
• Saxena Sandeep Kumar
• Panwar Rajiv
• Nandan Devaki
• Kumar Jagdish

Classifications

• C10G2300/70

  Catalyst aspects · CPC title

• B01J2229/37

  Acid treatment · CPC title

• B01J37/0009

  Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst · CPC title

• C10L2200/0446

  Diesel · CPC title

• B01J2229/42

  Addition of matrix or binder particles · CPC title