Aldehyde Separation Train With Vaporizer Temperature Ratio Control
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Solution Overview
Problem
The accumulation of high-boiling point by-products during the hydroformylation reaction reduces process stability and efficiency, necessitating a method to activate the reaction while minimizing the production and circulation of these impurities.
Innovation Solution
A method involving controlled temperature ratios between the vaporizer and reactor, coupled with vacuum pumping to manage internal pressure, is employed to separate and reduce high-boiling point by-products, enhancing the hydroformylation process efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the hydroformylation reaction is performed to produce aldehyde, then the aldehyde yield is improved, but high-boiling point by-products accumulate and reduce process stability
Solution Approach 1:
The patent applies parameter changes by controlling the vaporizer operating temperature to be 1.1 to 1.9 times the reactor temperature. This specific temperature ratio parameter optimization enables effective separation of high-boiling point by-products while maintaining efficient hydroformylation reaction, thus resolving the contradiction between aldehyde yield and process stability
Solution Approach 2:
The patent utilizes phase transitions through the vaporization process where the liquid separated product is vaporized in the vaporizer. By controlling the temperature ratio, aldehyde and unreacted olefin are vaporized while high-boiling point by-products remain in the liquid phase, enabling separation and preventing their accumulation in the circulation system, thereby maintaining process stability without sacrificing productivity
2Manufacturing precision
If the vaporizer temperature is increased to separate by-products, then the separation efficiency is improved, but the production of high-boiling point by-products increases
Solution Approach 1:
The patent precisely controls the vaporizer temperature parameter within the specific range of 1.1 to 1.9 times the reactor temperature. This optimized parameter setting achieves the minimum effective temperature for separating high-boiling point by-products from the reaction mixture, improving separation efficiency while minimizing the formation of additional by-products through excessive heating
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
The controlled temperature ratio and vacuum pumping effectively decrease the production and circulation of high-boiling point by-products, maintaining process stability and improving the yield of aldehyde production.
Implementation Method 1
vaporizing the liquid separated product in the vaporization part to separate a vapor stream including the unreacted olefin and the aldehyde, and a liquid stream including the catalyst
Implementation Method 2
supplying the vapor stream to a second flash drum to separate an upper discharge stream from the second flash drum including the unreacted olefin, and a lower discharge stream from the second flash drum including the aldehyde
Implementation Method 3
supplying the lower discharge stream from the second flash drum to a distillation tower and performing distillation to obtain the aldehyde
Data Source
Figure 1~2
AI summary
Provided is a method for preparing an aldehyde including: reacting reactants in a reactor to obtain a reaction product; supplying the reaction product to a first flash drum, performing gas-liquid separation, and supplying a liquid separated product to a vaporization part including a vaporizer; vaporizing the liquid separated product in the vaporization part to separate a vapor stream and a liquid stream; supplying the vapor stream to a second flash drum to separate an upper discharge stream from the second flash drum and a lower discharge stream from the second flash drum; and supplying the upper discharge stream from the second flash drum to one or more flash drums, and supplying the lower discharge stream from the second flash drum to a distillation tower and performing distillation to obtain the aldehyde from a lower discharge stream from the distillation tower, wherein a ratio of an operating temperature of the vaporizer to a reaction temperature of the reactor is controlled.