Acetic Acid Dehydration via Acetyl Chloride Reaction
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Solution Overview
Problem
Current methods for reducing water content in acetic acid, such as azeotropic distillation and extractive distillation, face challenges including high energy requirements, inadequate dehydration, and high costs, making it difficult to achieve low water concentrations efficiently.
Innovation Solution
Contacting wet acetic acid with acetyl chloride, acetic anhydride, hydrogen chloride, or chlorosilane to dehydrate it, allowing for dehydration to parts per million levels with relatively low energy requirements, using standard batch reactors or columns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If distillation is used to separate water from acetic acid, then separation is achieved, but energy consumption increases and dehydration becomes especially difficult at high acetic acid concentrations
Solution Approach 1:
The patent changes the chemical parameters by introducing reactive dehydrating agents (acetyl chloride, acetic anhydride, hydrogen chloride, or chlorosilanes) that chemically react with water to form removable byproducts. This chemical transformation approach replaces the thermal energy-intensive distillation process, achieving dehydration through chemical reaction rather than continuous heating and phase change.
Solution Approach 2:
The patent extracts water from the acetic acid system by introducing dehydrating agents that selectively react with and remove water molecules. The water is converted into separable byproducts (HCl, acetic acid, or silane derivatives) that can be easily removed from the system, effectively extracting the problematic water component without requiring energy-intensive distillation.
2Manufacturing precision
If azeotropic distillation is used to reduce water content, then dehydration is achieved, but capital investment and operational costs increase
Solution Approach 1:
The patent employs relatively inexpensive dehydrating agents (acetyl chloride, acetic anhydride, hydrogen chloride, or chlorosilanes) that are added in controlled amounts, perform their dehydration function, and are then removed or recycled. These reagents are cheaper than the complex equipment and operational costs associated with azeotropic distillation systems, providing a cost-effective alternative for water removal.
Solution Approach 2:
The patent replaces the mechanical/thermal distillation system with a chemical reaction system. Instead of using complex distillation columns, reflux condensers, and energy-intensive heating systems, the invention uses chemical dehydrating agents that react with water to form separable byproducts, substituting a simple chemical process for a complex mechanical separation system.
3Manufacturing precision
If membrane pervaporation is used for dehydration, then water removal is achieved, but capital investment increases and water content reduction to parts per million levels is not always adequate
Solution Approach 1:
The patent changes the approach from physical separation based on membrane permeability to chemical transformation. By introducing dehydrating agents that chemically react with water, the system achieves complete water removal to parts per million levels through chemical conversion, overcoming the limitations of membrane pervaporation that cannot achieve such low water contents.
Solution Approach 2:
The patent extracts water from the acetic acid system by introducing dehydrating agents that selectively react with and remove water molecules. The water is converted into separable byproducts (HCl, acetic acid, or silane derivatives) that can be easily removed from the system, effectively extracting the problematic water component without requiring energy-intensive distillation.
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 method effectively reduces water content in acetic acid to low levels, achieving high water conversion rates while minimizing energy consumption and operational costs, suitable for commercial-scale applications.
Implementation Method 1
The process of the invention pertains to dehydrating wet acetic acid... wet acetic acid is contacted with acetyl chloride... acetyl chloride reacts directly with the water in the wet acetic acid to form acetic acid and hydrogen chloride products
Implementation Method 2
wet acetic acid is also dehydrated by contacting wet acetic acid with acetic anhydride
Implementation Method 3
contacting wet acetic acid with acetic anhydride, and with a catalytic effective amount of acetyl chloride, hydrogen chloride, or a chlorosilane
Data Source
AI summary
The invention pertains to a process for dehydrating wet acetic acid. One embodiment of the invention comprises contacting wet acetic acid with acetyl chloride. Another embodiment of the invention comprises contacting wet acetic acid; acetic anhydride; and a catalytic effective amount of hydrogen chloride, acetyl chloride, or a chlorosilane.