Plasma Reactor for Olefin Production via Methane Conversion
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Solution Overview
Problem
Current processes for producing light olefins from hydrocarbon feeds, such as ethane cracking and methane reforming, face challenges with high-temperature operation, catalyst deactivation, and limited industrial feasibility, resulting in low yield, selectivity, and high costs.
Innovation Solution
A combined reaction apparatus and process integrating an ethane cracking unit with a dielectric barrier reaction unit, where methane is converted to a saturated hydrocarbon through plasma reaction, and then further processed in the ethane cracking unit, utilizing catalysts like TiO2, mercaptopropyl-functionalized silica, and others to enhance radical generation and olefin production, with a catalyst regeneration unit to maintain efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ethane cracking process or methane reforming process is used to produce light olefins from shale gas, then olefin production yield and selectivity are improved, but industrial feasibility deteriorates due to high-temperature operation and catalyst deactivation by coke generation
Solution Approach 1:
The invention segments the olefin production process into two distinct units: a dielectric barrier discharge reaction unit for converting methane to saturated hydrocarbons at low temperature, and an ethane cracking unit for producing olefins. This segmentation allows each unit to operate under optimal conditions, with the first unit avoiding high-temperature catalyst deactivation and the second unit focused on olefin production, thereby resolving the contradiction between productivity and reliability
Solution Approach 2:
The invention introduces saturated hydrocarbons (ethane, propane, butane) as an intermediary substance. The dielectric barrier discharge reaction unit produces these saturated hydrocarbons from methane, which then serve as feedstock for the ethane cracking unit to produce olefins. This intermediary approach allows the process to bypass the need for direct high-temperature cracking of methane, improving both yield and industrial feasibility
2Productivity
If conventional ethane cracking or methane reforming is used, then olefin selectivity is improved, but energy consumption increases due to high-temperature operation
Solution Approach 1:
The invention replaces the conventional thermal cracking mechanism with a dielectric barrier discharge plasma mechanism for the initial methane conversion step. This substitution allows the reaction to proceed at lower temperatures using electrical energy in the form of plasma, thereby maintaining high olefin selectivity while reducing overall energy consumption compared to conventional high-temperature thermal processes
Solution Approach 2:
The invention changes the operational parameters of the reaction process by using dielectric barrier discharge to achieve methane conversion at lower temperatures than conventional cracking. By controlling the plasma discharge parameters and catalyst conditions in the first unit, the process achieves efficient methane conversion to saturated hydrocarbons without requiring the high temperatures that would increase energy consumption
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach achieves high yield and selectivity of olefins like ethylene and propylene at lower energy costs and improved economic feasibility compared to existing methods.
Implementation Method 1
a dielectric barrier reaction unit that receives the methane feed from the feed separation unit and generates a saturated hydrocarbon feed through plasma reaction
Implementation Method 2
the catalyst compound promotes generation of radicals from the methane feed and generation of the saturated hydrocarbon feed through a bonding reaction between radicals
Data Source
AI summary
According to an embodiment of the present invention, there is provided a reaction apparatus for olefin production, including a feed separation unit that separates a methane feed and a light hydrocarbon feed from a supplied hydrocarbon feed; an ethane cracking unit that receives the light hydrocarbon feed from the feed separation unit and performs an ethane cracking process to produce an olefin product; and a dielectric barrier reaction unit that receives the methane feed from the feed separation unit and generates a saturated hydrocarbon feed through plasma reaction, in which the saturated hydrocarbon feed is supplied into the ethane cracking unit, and an olefin product is produced from the supplied saturated hydrocarbon feed through an ethane cracking process.