Pd-Cu Silica Catalyst for Isophthalic Acid Hydrogenation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for producing 1,3-cyclohexanedicarboxylic acid face challenges in maintaining catalyst activity under high temperature and strong acidic conditions, leading to inefficient conversion rates and impurity issues.
Innovation Solution
A method involving a metal catalyst supported on silica, comprising a palladium (Pd) compound and a copper (Cu) compound in a specific weight ratio, which enhances catalyst durability and acid resistance, allowing for high-purity 1,3-cyclohexanedicarboxylic acid production with minimal by-products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional catalyst systems are used for aromatic ring hydrogenation of isophthalic acid, then the reaction can proceed under high temperature conditions, but the catalyst activity deteriorates rapidly under strong acidic conditions (pH=1 or less)
Solution Approach 1:
The patent uses a composite catalyst system comprising palladium (Pd) and copper (Cu) metals supported on a silica carrier. This composite structure combines the hydrogenation activity of Pd with the acid resistance enhancement provided by Cu, creating a catalyst that maintains both high activity and durability under the harsh conditions of high temperature and strong acid (pH=1 or less). The specific weight ratio of Pd to Cu (1:0.1 to 0.5) optimizes the synergistic effect between the two metals.
Solution Approach 2:
The silica support acts as an intermediary carrier that provides a stable platform for the Pd-Cu metal combination. The silica support protects the metal particles from direct contact with the strongly acidic environment while still allowing reactant and product diffusion, thereby preserving catalyst activity over extended reaction periods at elevated temperatures.
2Productivity
If high temperature (150 to 300°C) is applied for aromatic ring hydrogenation, then the reaction rate increases, but the acidity of the solution decreases proportionally, creating strongly acidic conditions that reduce catalyst activity
Solution Approach 1:
The Pd-Cu composite catalyst on silica support is specifically designed to withstand the strongly acidic conditions generated at high reaction temperatures. The Cu component enhances acid resistance while Pd maintains hydrogenation activity, allowing the system to operate effectively at 150-300°C without rapid catalyst deactivation.
Solution Approach 2:
The patent optimizes the weight ratio of Pd to Cu (1:0.1 to 0.5) and the loading amounts (Pd: 0.01-10% by weight, Cu: 0.001-1% by weight based on isophthalic acid) to achieve the best balance between reaction rate and catalyst stability under high temperature-strong acid conditions.
3Ease of manufacture
If conventional catalysts are used, then the process can be implemented with existing technology, but the conversion rates are insufficient and by-products increase
Solution Approach 1:
The Pd-Cu/Silica composite catalyst provides superior selectivity for the hydrogenation of isophthalic acid to 1,3-cyclohexanedicarboxylic acid. The specific metal combination and ratio enhance the desired reaction pathway while minimizing side reactions, achieving product purity of 90% or more without requiring complex additional purification steps.
4Quantity of substance
If the reaction is extended to improve conversion rates, then more reactants participate, but the process time increases and economic efficiency decreases
Solution Approach 1:
The Pd-Cu composite catalyst on silica support achieves high conversion rates (90% or more) within a shortened reaction period due to its enhanced activity and stability. The Cu component prevents catalyst deactivation that would normally require extended reaction times, allowing rapid achievement of high conversion while maintaining economic efficiency.
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 method achieves high conversion rates and selectivity of 1,3-cyclohexanedicarboxylic acid with improved catalyst durability, reducing by-products and simplifying the production process, thereby enhancing reaction and economic efficiency.
Implementation Method 1
a method for preparing 1,3-cyclohexanedicarboxylic acid including a step of reducing isophthalic acid in the presence of a metal catalyst fixed to a silica support and containing a palladium (Pd) compound and a copper (Cu) compound
Implementation Method 2
a step of reducing isophthalic acid in the presence of a metal catalyst fixed to a silica support
Data Source
AI summary
The present invention relates to a method for preparing 1,3-cyclohexanedicarboxylic acid capable of exhibiting excellent activity, of enhancing the reaction efficiency and economic efficiency by using a catalyst having improved durability under the reaction conditions of high temperature and strong acid, of achieving excellent conversion rates by allowing most of reactants to participate in the reaction, and of obtaining products having high purity while minimizing by-products within a shorter period of time. The method for preparing 1,3-cyclohexanedicarboxylic acid may include: reducing isophthalic acid in the presence of a metal catalyst fixed to a silica support and containing a palladium (Pd) compound and a copper (Cu) compound in a weight ratio of 1:0.1 to 0.5.