Membrane Pervaporation for T-Butyl Hydroperoxide Water Removal
Solution Overview
Problem
High water concentrations in mixtures containing t-butyl hydroperoxide lead to reduced propylene oxide selectivity due to the formation of undesirable byproducts like mono propylene glycol during propylene oxide production.
Innovation Solution
The use of a membrane, such as a pervaporation membrane, to reduce water content in t-butyl hydroperoxide mixtures by at least 50% through multiple contacts, followed by reaction with propylene in the presence of a catalyst to produce propylene oxide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If water is not removed from the mixture containing t-butyl hydroperoxide, then the process is simpler and faster, but propylene oxide selectivity decreases significantly due to byproduct formation
Solution Approach 1:
Water removal is performed before the propylene oxide production reaction to prevent byproduct formation. The membrane contactor removes water from the t-butyl hydroperoxide mixture in advance, ensuring high selectivity in the subsequent epoxidation reaction without requiring complex in-situ water management systems
Solution Approach 2:
Water is extracted from the reaction mixture using a membrane contactor that selectively removes water through pervaporation. This extraction step separates the harmful water component from the t-butyl hydroperoxide before the main reaction, preventing water-induced side reactions while maintaining process simplicity
2Quantity of substance
If water is removed from the mixture using traditional distillation methods, then water content is reduced, but energy consumption and process time increase significantly
Solution Approach 1:
The mechanical distillation system is replaced with a membrane-based pervaporation system. The membrane contactor uses selective permeability rather than thermal distillation to remove water, dramatically reducing energy consumption while achieving the same water removal objective through selective molecular transport
Solution Approach 2:
The water removal process operates at lower temperatures and different pressure conditions compared to traditional distillation. By changing the operational parameters to match the membrane's optimal pervaporation conditions, water is removed efficiently with minimal energy input while preserving the integrity of heat-sensitive components
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
Significantly reduces water content to 0.1% or less, enhancing propylene oxide selectivity and minimizing byproduct formation.
Implementation Method 1
the methods include providing a first mixture including t-butyl hydroperoxide, t-butyl alcohol, and a first amount of water; contacting at least a portion of the first mixture with a membrane one or more times to produce a second mixture including t-butyl hydroperoxide, t-butyl alcohol, and a second amount of water
Data Source
AI summary
Methods and systems for removing or reducing water and producing epoxide. The methods may include providing a first mixture that includes t-butyl hydroperoxide, t-butyl alcohol, and a first amount of water; and contacting at least a portion of the first mixture with a membrane to reduce the amount of water in the first mixture.