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Process for converting paraffin to olefin and catalyst for use therein

a technology of olefin and paraffin, which is applied in the direction of catalyst regeneration/reactivation, physical/chemical process catalysts, bulk chemical production, etc., can solve the problems of high energy consumption, low ethylene and propylene yield, and complex combination of steam cracking reactions and gas recovery systems, etc., to achieve the effect of improving process efficiency

Inactive Publication Date: 2017-07-06
SCG CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention aims to solve the problems of prior art by providing a process that can efficiently convert low value paraffin to higher value olefin at mild conditions. The process is cost-effective and offers improved efficiency. The examples provided in the patent demonstrate the advantages of the invention by showing the surprising effects of certain steps and conditions of the process. Overall, the invention provides an effective and economical process for converting paraffin to olefin.

Problems solved by technology

Steam cracking involves a very complex combination of reactions and gas recovery systems.
It is also highly energy intensive and gives relatively low ethylene and propylene yields.
However, this process consumes ethylene and butenes which have many other downstream uses and relatively high commercial value.
Dehydrogenation process provides better olefin yield than steam cracking but exhibits rapid catalyst coking requiring frequent and costly regeneration.
Moreover, the significant capital cost of a propane dehydrogenation plant is normally justified only in cases of large-scale propylene production units (e.g., typically 250,000 metric tons per year or more).
This process requires severe operating condition and hence high energy consumption with low olefins yield.
This process requires relatively high operating temperature and consumes high value feedstock materials like hydrogen and ethylene.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0051]3 grams of catalyst comprising 8 percent by weight of tungsten on a solid support comprising 5 percent by weight of HY-zeolite and 95 percent by weight of silicon dioxide was mixed with 3 grams of magnesium oxide and then packed in a tubular reactor.

[0052]After that the catalyst was pretreated by flowing air through the catalyst bed at a temperature of 500° C. and WHSV 0.30 hr−1 for 4 hours, then subsequently flow 10 percent by volume of hydrogen gas balancing with nitrogen through the catalyst bed at a temperature of 400° C. and WHSV 0.002 hr−1 for 1 hour and then raised temperature to 550° C. and hold for 2 hours before cooling down to reaction temperature at 350° C.

[0053]When bed temperature reached 350° C., feedstock containing 10 percent by weight of n-butane and 20 percent by weight of ethylene balancing with nitrogen was fed through the catalyst bed at flow rate 10-20 cc / min and pressure 20 barg.

[0054]Effluents from the reaction were directed to GC-FID (Agilent) to meas...

example 2

[0055]An experiment the same as in Example 1 was performed with a feedstock containing 10 percent by weight of i-butane and 20 percent by weight of ethylene balancing with nitrogen. The result of this experiment is shown in Table 1.

example 3

[0056]An experiment the same as in Example 1 was performed with a feedstock containing 10 percent by weight of propane and 20 percent by weight of ethylene balancing with nitrogen. The result of this experiment is shown in Table 1.

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Abstract

The invention relates to a process for converting paraffin to olefin comprising the following steps: (a) providing a hydrocarbon feedstock containing at least one paraffin having 1 to 12 carbon atoms and at least one olefin having 2 to 12 carbon atoms; (b) providing a catalyst containing at least one Group VIA and / or Group VIIA transition metal on a solid support; (c) pretreating the catalyst by contacting the catalyst with at least one reducing gas and at least one oxidizing gas; and (d) contacting the by hydrocarbon feedstock and the pretreated catalyst at a temperature in the range of 200° C. to 600° C., preferably 320° C. to 450° C. and to a catalyst for use therein.

Description

TECHNICAL FIELD[0001]The present invention relates to a process for converting paraffin to olefin and to a catalyst for use therein.BACKGROUND ART[0002]Olefins have long been desired as feedstock for the petrochemical industries. They are useful in preparing a wide variety of petrochemical goods. Propylene is one of the most important olefin and its demand has grown substantially, largely due to its use as a precursor in the production of polypropylene for packaging materials and other commercial products.[0003]Methods are known for the production of olefins. Currently, the majority of light olefins such as ethylene and propylene are produced during the steam cracking or pyrolysis of hydrocarbon feedstock such as ethane, propane, natural gas, petroleum liquids, naphtha and carbonaceous materials.[0004]Steam cracking involves a very complex combination of reactions and gas recovery systems. It is also highly energy intensive and gives relatively low ethylene and propylene yields. It ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C07C5/333B01J37/18B01J35/00B01J37/08B01J23/30B01J21/10
CPCC07C5/3335B01J23/30B01J21/10B01J35/0006C07C2521/10B01J37/18C07C2523/30C07C2521/08C07C2529/16B01J37/08C07C5/3332C07C6/04C07C2521/02C07C2521/06C07C2521/18C07C2523/28C07C2523/36C07C2529/08C07C2529/40C07C2529/65C07C2529/70B01J38/02B01J38/12B01J21/08B01J23/92B01J29/084B01J29/90Y02P20/584Y02P20/52B01J35/19C07C11/04C07C11/06
Inventor SURIYE, KONGKIATJAREEWATCHARA, WUTTITHEPLEKNGAM, PRUPHANYANONKHAMWONG, ANUWATSUTTHIUMPORN, KESADA
Owner SCG CHEM CO LTD