Two-Step Catalytic NGL Upgrading Beyond Steam Cracking
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Solution Overview
Problem
Current methods for upgrading natural gas liquids (NGL) to higher molecular weight hydrocarbons are inefficient and uneconomical, particularly for small-scale operations in remote shale gas formations, and lack technologies for uniformly dehydrogenating a mixture of C2, C3, C4, and C5 without thermal cracking.
Innovation Solution
A two-step process involving catalytic dehydrogenation of light alkanes to alkenes followed by oligomerization, using bimetallic catalysts with Group VIII noble metals and metals like manganese, vanadium, chromium, or titanium, to produce higher molecular weight hydrocarbons, which can be integrated into modular plants for local processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If steam cracking is used for dehydrogenation of ethane, then ethylene production is achieved, but high energy consumption and high operating cost occur
Solution Approach 1:
The patent replaces the thermal cracking process (heat-based mechanical system) with a catalytic dehydrogenation process using bimetallic catalysts. This substitution lowers the operating temperature from approximately 800°C to 300-500°C, significantly reducing energy consumption while maintaining ethylene production efficiency
Solution Approach 2:
The patent changes the key operating parameters by using bimetallic catalysts that enable dehydrogenation at lower temperatures and pressures compared to steam cracking. The catalyst system modifies the reaction conditions to achieve the same product output with reduced energy input
2Ease of manufacture
If pipelines are constructed to transport natural gas liquids to processing plants, then NGL can be processed, but capital cost increases significantly
Solution Approach 1:
The bimetallic catalyst system is designed to handle multiple NGL components (ethane, propane, butane, pentane) simultaneously, enabling a single processing unit to upgrade various NGL streams. This multi-functionality reduces the need for separate processing facilities and associated infrastructure
Solution Approach 2:
The patent introduces modular processing units that can be deployed closer to NGL sources, acting as intermediaries between remote gas fields and major processing plants. This reduces the need for extensive pipeline infrastructure by enabling local upgrading capabilities
3Use of energy by moving object
If uniform dehydrogenation of C2-C5 mixture is achieved without thermal cracking, then energy consumption is reduced, but appropriate catalyst technology was previously unavailable
Solution Approach 1:
The patent employs bimetallic catalysts combining Group VIII noble metals (Pt, Pd, Rh, Ir) with metals from groups III-B through VIII (Ga, In, Zn, Cd, Hg, Ge, Sn, Pb, Al, Sc, Y, La, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Ag, Au, Hf, Ta, W, Re, Os, Ru). This composite catalyst structure enables uniform dehydrogenation of C2-C5 hydrocarbon mixtures at lower temperatures without thermal cracking
Solution Approach 2:
The patent changes the physical and chemical parameters of the dehydrogenation process by using bimetallic catalysts that operate effectively at lower temperatures (300-500°C) and pressures compared to thermal cracking, enabling energy-efficient processing of mixed NGL streams
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 process efficiently transforms NGL into valuable liquid fuels and refinery feedstock, reducing energy consumption and costs by avoiding steam cracking, enabling economic utilization of stranded gas resources.
Implementation Method 1
catalytic dehydrogenation of light alkanes to alkenes
Implementation Method 2
catalytic oligomerization of the alkenes to higher molecular weight hydrocarbons
Data Source
AI summary
A process to catalytically transform natural gas liquid (NGL) into higher molecular weight hydrocarbons includes providing an NGL stream, catalytically dehydrogenating at least a portion of the NGL stream components to their corresponding alkene derivatives, catalytically oligomerizing at least a portion of the alkenes to higher molecular weight hydrocarbons and recovering the higher molecular weight hydrocarbons. The NGL stream can be extracted from a gas stream such as a gas stream coming from shale formations. The higher molecular weight hydrocarbons can be hydrocarbons that are liquid at ambient temperature and ambient pressure.