Loop Reactor Heat Exchanger Turbulators for Acetone Cyanohydrin Hydrolysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The hydrolysis of acetone cyanohydrin with sulfuric acid in the ACH-sulfo process for producing methacrylic acid or methyl methacrylate faces issues with yield reduction due to side reactions and inefficient heat dissipation, leading to temperature peaks and pressure losses in loop reactors, which are exacerbated by the increased viscosity and laminar flow as temperature drops.
Innovation Solution
Equipping heat exchangers in loop reactors with turbulators and using a metering ring for precise feeding of reactants, integrated with pumps, to enhance heat exchange efficiency and mixing while minimizing pressure loss, with turbulators installed in heat exchangers and metering rings positioned to promote turbulent flow and optimal mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the mixture is cooled too much before dosing ACH to remove reaction heat, then heat dissipation is improved, but viscosity increases sharply and flow turbulence decreases into laminar range leading to inefficient heat dissipation and slower mixing
Solution Approach 1:
The system dynamically adjusts the balance between cooling intensity and flow turbulence by integrating the heat exchanger within the loop reactor circulation system. The continuous circulation and controlled cooling maintain optimal temperature while preserving turbulent flow conditions through the dynamic interaction of cooling rate and flow velocity.
Solution Approach 2:
The heat exchanger is merged with the loop reactor system, where the reaction mixture circulates through the heat exchanger and returns to the reactor. This integration allows simultaneous heat removal and maintenance of turbulent flow, as the circulation pump maintains flow velocity while the heat exchanger provides controlled cooling.
2Stability of the object's composition
If mixing units are added to the loop reactor to improve mixing, then mixing efficiency is improved, but flow resistance increases significantly leading to pressure losses and reduced flow rate
Solution Approach 1:
The loop reactor system uses its own circulation flow and the natural turbulence generated by the pump and heat exchanger to achieve mixing, eliminating the need for separate mixing units. The continuous circulation and temperature-driven convection currents provide sufficient mixing action without adding external mixing equipment that would increase pressure loss.
3Productivity
If residence time is increased to improve reaction conversion, then conversion is improved, but temperature peaks increase leading to yield reduction due to the temperature-sensitive nature of the reaction
Solution Approach 1:
The loop reactor provides continuous circulation and continuous heat removal, maintaining steady-state temperature conditions throughout the reaction. This continuous action allows extended residence time for high conversion while preventing temperature peaks through constant heat dissipation, as the system operates in a stable, continuous manner rather than batch-wise.
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 improves heat exchange efficiency, reduces pressure losses, and increases yield by maintaining turbulent flow and efficient mixing, resulting in higher production yields and better temperature control during the hydrolysis process.
Implementation Method 1
The reaction is exothermic, so that heat of reaction is advantageously removed from the system
Implementation Method 2
they have the advantage of primarily enabling good heat exchange because they reduce the tendency to form a laminar flow
Implementation Method 3
Rapid mixing of ACH and reaction mixture is required because the ACH should react before it decomposes due to heating
Implementation Method 4
acetone cyanohydrin is subjected to hydrolysis. The desired MAAm is formed after a series of reactions at different temperature levels
Implementation Method 5
The reaction is exothermic, so that heat of reaction is advantageously removed from the system
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present invention relates to a method for hydrolysing acetone cyanohydrin (ACH) by sulphuric acid in the context of the ACH-sulpho method for producing methacrylic acid (MAA) or methyl methacrylate (MMA).