Isobutanol Dehydration Under Pressure With High Isobutylene Conversion
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Solution Overview
Problem
Existing methods for producing isobutylene from isobutanol under pressure face a challenge of low isobutanol conversion rate despite improved isobutylene selectivity.
Innovation Solution
The method involves contacting a raw material gas containing isobutanol with a catalyst at a linear velocity of 1.20 cm/s or more and a pressure of 120 kPa or more, using a catalyst with specific properties such as alumina, to produce isobutylene with high selectivity while maintaining conversion rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If isobutanol dehydration is conducted under pressure to improve isobutylene selectivity, then isobutylene selectivity is improved, but isobutanol conversion rate decreases
Solution Approach 1:
The invention changes the operating parameters by conducting dehydration at a pressure of 120 kPa or more (preferably 150-500 kPa) and controlling the linear velocity to 1.20 cm/s or more (preferably 1.50-3.00 cm/s). This parameter optimization resolves the contradiction by finding the optimal balance point where both selectivity and conversion rate are maintained at high levels.
Solution Approach 2:
The invention employs dynamic control of the linear velocity parameter, adjusting it to 1.20 cm/s or more based on the reaction conditions. This dynamic adjustment allows the system to adapt to pressure changes and maintain optimal conversion rates while preserving high selectivity throughout the reaction process.
2Productivity
If catalyst particle diameter is reduced to increase surface area, then catalytic activity increases, but pressure drop across the catalyst bed increases
Solution Approach 1:
The invention optimizes the catalyst particle diameter to a specific range (700 μm or more and 10,000 μm or less, preferably 800-9,500 μm). This parameter selection balances the competing requirements: particles are small enough to provide sufficient surface area for high catalytic activity but large enough to minimize pressure drop across the catalyst bed, ensuring smooth gas flow.
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 enhances isobutylene production selectivity while preventing a decrease in isobutanol conversion rate, optimizing process efficiency and reducing equipment and energy costs.
Implementation Method 1
a raw material gas containing isobutanol is brought into contact with a catalyst to produce isobutylene from isobutanol
Data Source
AI summary
There is provided a method for producing isobutylene, in which isobutylene is produced from isobutanol with a high selectivity while suppressing a decrease in the isobutanol conversion rate under pressure. In the method for producing isobutylene according to the present invention, a raw material gas containing isobutanol is brought into contact with a catalyst to produce isobutylene from isobutanol, the method including bringing the raw material gas containing isobutanol into contact with a catalyst at a linear velocity of 1.20 cm/s or more under a pressure of 120 kPa or more in terms of absolute pressure to produce isobutylene from isobutanol.