Alkylene Carbonate Reactor Nozzle Layout for Higher Oxide Conversion
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Solution Overview
Problem
Existing methods for producing alkylene carbonate from alkylene oxide and carbon dioxide do not achieve a high conversion rate of alkylene oxide.
Innovation Solution
The method involves controlling the ratio of the height from the liquid level to the discharge outlet of the nozzle (DL) to the height from the bottom tangent line of the reaction vessel to the discharge outlet (DT) within a specified range of 0.1 to 0.7, using multiple nozzles to feed the raw material liquid along the inner surface of the reaction vessel, and circulating the reaction liquid to enhance carbon dioxide absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional catalysts and reaction conditions are used, then the reaction can proceed, but the conversion rate of alkylene oxide is insufficient
Solution Approach 1:
The invention changes the physical parameters of the reaction system by controlling the liquid level height ratio (DL/DT) within 0.1 to 0.7, and by circulating the reaction liquid at 10 to 70 times per hour. These parameter changes optimize the contact between gaseous carbon dioxide and the reaction liquid, significantly improving the conversion rate of alkylene oxide while maintaining reaction efficiency.
2Productivity
If the reaction liquid is circulated frequently, then carbon dioxide absorption is enhanced, but energy consumption increases
Solution Approach 1:
The invention optimizes the circulation frequency parameter to within 10 to 70 times per hour, finding the optimal balance point where sufficient carbon dioxide absorption occurs without excessive energy consumption. This parameter optimization ensures high productivity while controlling energy use at reasonable levels.
3Ease of operation
If the nozzle is positioned higher, then raw material liquid distribution is improved, but the liquid level height ratio becomes suboptimal
Solution Approach 1:
The invention defines the optimal liquid level height ratio (DL/DT) range of 0.1 to 0.7, which simultaneously achieves good raw material liquid distribution through the nozzle and maintains high conversion rate. This parameter specification resolves the contradiction by identifying the optimal positional relationship between nozzle and liquid level.
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 configuration achieves a high conversion rate of alkylene oxide, with the method and apparatus demonstrating improved reaction efficiency and alkylene carbonate production.
Implementation Method 1
feed the raw material liquid having dissolved carbon dioxide in the first reaction vessel to the reaction liquid
Implementation Method 2
a number of circulations of the reaction liquid per unit time is 10 to 70/hr
Data Source
AI summary
A method for producing an alkylene carbonate using a first reaction vessel in which a reaction liquid containing a catalyst and carbon dioxide in a gaseous state are contained, comprising; a step (A) of feeding a raw material liquid containing an alkylene oxide through a nozzle so that the raw material liquid moves from the upper part of the first reaction vessel along the inner surface to the lower part thereof to feed the raw material liquid having dissolved carbon dioxide in the first reaction vessel to the reaction liquid; and a step (B) of reacting the alkylene oxide and carbon dioxide in the reaction liquid containing the catalyst in the lower part of the first reaction vessel to obtain the alkylene carbonate; wherein the ratio (DL/DT) of the height DL from the liquid level in the first reaction vessel to the discharge outlet of the nozzle to the height DT from the bottom tangent line of the first reaction vessel to the discharge outlet of the nozzle is 0.1 to 0.7.