Ethane Chlorination Using Low-Melting Metal Chloride
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Solution Overview
Problem
Current methods for producing ethylene from ethane, such as steam pyrolysis and oxidative dehydrogenation, face challenges including high energy consumption, low heat utilization, high production costs, and reduced ethylene yield due to the presence of by-products, with catalyst preparation being complex and inefficient.
Innovation Solution
A method involving the use of low-melting-point metal chlorides for chlorination and dehydrogenation of ethane, where the reaction temperature is controlled to produce ethylene, acetylene, and vinyl chloride, with a low-melting-point metal acting as an intermediate medium, allowing for high conversion rates and simple process execution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If steam pyrolysis is used to produce ethylene from ethane, then ethylene can be produced, but energy consumption is high and heat utilization is low
Solution Approach 1:
The patent introduces a metal chloride catalyst as an intermediary substance to mediate the reaction between ethane and produce ethylene. The catalyst provides an alternative reaction pathway with lower activation energy, enabling the reaction to proceed at lower temperatures and reducing energy consumption while maintaining high ethylene production efficiency
Solution Approach 2:
The patent changes the reaction parameters by using a catalyst to lower the operating temperature from the high temperatures required in steam pyrolysis to moderate temperatures where the catalytic reaction is most effective. This parameter change significantly reduces energy consumption while maintaining high ethylene yield
2Temperature
If oxidative dehydrogenation is used to produce ethylene from ethane, then reaction conditions are milder, but oxygen-containing by-products increase and selectivity for ethylene decreases
Solution Approach 1:
The patent uses a metal chloride catalyst as an intermediary to facilitate the dehydrogenation reaction without requiring oxygen participation. This catalytic intermediary enables the reaction to proceed under mild conditions while selectively producing ethylene without oxygen-containing by-products, thereby maintaining high selectivity
Solution Approach 2:
The patent creates an inert reaction environment by using a catalytic mechanism that does not require oxygen, thereby preventing the formation of oxygen-containing by-products. The catalyst enables the reaction to proceed in an atmosphere free from oxidative side reactions, ensuring high ethylene selectivity
3Temperature
If catalytic oxidative dehydrogenation is used, then ethylene can be produced under mild conditions, but catalyst preparation is troublesome and complex
Solution Approach 1:
The patent employs simple, inexpensive metal chloride compounds as catalysts that can be easily prepared and handled. These catalysts, while potentially consumable, are cheap and simple to replace, making the overall process easier to manufacture and operate compared to complex catalyst systems requiring sophisticated preparation procedures
4Productivity
If steam pyrolysis is used, then ethylene is produced, but heavy olefins and aromatic hydrocarbons are also formed reducing ethylene yield
Solution Approach 1:
The metal chloride catalyst acts as an intermediary that directs the reaction pathway specifically toward ethylene formation. The catalyst's active sites selectively facilitate the cleavage and recombination steps that produce ethylene while suppressing side reactions that would form heavy olefins and aromatic hydrocarbons, thereby improving ethylene yield
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 method achieves high ethylene selectivity and yield, reduces energy consumption, and allows for the production of additional valuable by-products like acetylene and vinyl chloride, making it suitable for industrial-scale production with lower costs.
Implementation Method 1
the low-melting-point metal chloride in a gaseous state can be reduced at the reaction temperature by H2 to give a liquid-state low-melting-point metal and hydrogen chloride
Implementation Method 2
mixing a low-melting-point metal chloride in a gas phase
Data Source
AI summary
The present invention relates to a method for chlorination and dehydrogenation of ethane, comprising: mixing and reacting a low-melting-point metal chloride with C2H6, such that the low-melting-point metal chloride is reduced to a liquid-state low-melting-point metal, and the C2H6 is chlorinated and dehydrogenized to give a mixed gas containing HCl, C2H6, C2H4, C2H2 and C2H3Cl. In the method, the low-melting-point metal chloride is used as a raw material for chlorination and dehydrogenation, and the low-melting-point metal produced after the reaction is used as an intermediate medium. The method has the characteristics of simple process, low cost and high yield. Moreover, some acetylene and vinyl chloride can be produced as by-products at the same time when the ethylene is produced, by controlling the ratio of ethane to the chloride as desired in production.