Zeolite Membrane Separation for Piperylene Purification
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Solution Overview
Problem
It is challenging to separate piperylene in high purity from a hydrocarbon mixture with a specific composition derived from a petroleum fraction of carbon number 5 using extractive distillation methods.
Innovation Solution
A method involving membrane separation using a zeolite membrane, preferably silylated and supported on shirasu porous glass or silicon carbide, is employed to enrich piperylene, with pervaporation being the preferred process for achieving high-purity piperylene production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If extractive distillation is used to separate piperylene from hydrocarbon mixture, then the separation process can be performed using conventional equipment, but high-purity piperylene cannot be obtained from hydrocarbon mixtures with specific composition (60-80% piperylene, 20-40% cyclic hydrocarbons)
Solution Approach 1:
The patent employs a zeolite membrane with specific pore structures (MFI-type, MEL-type, or MWW-type zeolites) to separate piperylene from cyclic hydrocarbons. The porous structure of the zeolite membrane allows selective permeation based on molecular size and shape, enabling high-purity piperylene separation that cannot be achieved by conventional extractive distillation for this specific hydrocarbon composition.
Solution Approach 2:
The patent replaces the mechanical separation process of extractive distillation with a membrane-based separation process. This substitution uses the selective permeation properties of zeolite membranes rather than relying on volatility differences and liquid-liquid extraction, providing superior separation effectiveness for piperylene-cyclic hydrocarbon mixtures.
2Productivity
If conventional separation methods are used, then the process is simpler to implement, but the sustainability and efficiency of multiple-cycle operation are reduced
Solution Approach 1:
The patent optimizes operational parameters including temperature (20-100°C), pressure conditions, and membrane configuration to enhance both separation efficiency and durability. The silylation treatment of the zeolite membrane modifies surface properties to improve selectivity and maintain performance over multiple cycles, addressing both productivity and duration requirements.
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 effectively produces high-purity piperylene with enhanced sustainability by significantly increasing piperylene concentration and maintaining separation performance over multiple cycles.
Implementation Method 1
a membrane separation step of performing membrane separation of the hydrocarbon mixture using a zeolite membrane to obtain a separated product in which piperylene is enriched
Implementation Method 2
the zeolite membrane is preferably a silylated zeolite membrane that has been silylated in a liquid phase
Data Source
AI summary
Provided is a method of producing piperylene from a hydrocarbon mixture derived from a petroleum fraction having a carbon number of 5. The hydrocarbon mixture has a piperylene proportional content of not less than 60 mass % and not more than 80 mass % and has a cyclic hydrocarbon proportional content of not less than 20 mass % and not more than 40 mass %. The method of producing piperylene includes a membrane separation step of performing membrane separation of the hydrocarbon mixture using a zeolite membrane to obtain a separated product in which piperylene is enriched.