Phthalate Hydrogenation Purification for Low Acid Value Output
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Solution Overview
Problem
Existing hydrogenation processes for phthalate based compounds suffer from high impurity content in reactants, leading to increased by-product generation, acid value, and catalyst deactivation, which affects yield and quality.
Innovation Solution
A process that controls the HAZE value of liquid-phase raw materials to 8% or less and acid value of the hydrogenation product to 0.3 KOHmg/g or less, using a hydrogenation catalyst with ruthenium, rhodium, or palladium, and platinum, and includes neutralization and filtration steps to minimize impurities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional hydrogenation process is used with conventional reactants, then the process is simple to operate, but impurity content increases leading to by-product generation and catalyst deactivation
Solution Approach 1:
The patent applies preliminary action by pre-treating the liquid-phase raw material through neutralization and filtration before hydrogenation. Specifically, the raw material is neutralized to adjust pH to 6-8, then filtered through a 0.2-0.5 μm filter to remove impurities before entering the hydrogenation reactor. This preliminary purification prevents catalyst deactivation and by-product formation during the main hydrogenation process.
Solution Approach 2:
The patent introduces an intermediary purification system between the raw material storage and the hydrogenation reactor. This intermediary system includes neutralization tanks and filtration units that act as mediators to remove harmful impurities from the liquid-phase raw material before it contacts the expensive hydrogenation catalyst, thereby protecting the catalyst and improving product quality.
2Manufacturing precision
If hydrogenation is conducted without strict impurity control, then the process complexity is low, but acid value of product increases and quality deteriorates
Solution Approach 1:
The patent implements preliminary neutralization and filtration actions before hydrogenation to control acid value. The raw material is neutralized to pH 6-8 and filtered through 0.2-0.5 μm filters before hydrogenation, which prevents acid value increase during reaction and eliminates the need for complex post-reaction purification systems.
Solution Approach 2:
The patent controls the pH parameter of the liquid-phase raw material by adjusting it to 6-8 through neutralization before hydrogenation. This parameter change prevents acid-catalyzed side reactions that would increase acid value, thereby simplifying the overall process while achieving precise acid value control in the final product.
3Productivity
If impurities are not removed before hydrogenation, then the manufacturing process is simpler, but by-product generation increases and yield decreases
Solution Approach 1:
The patent applies preliminary purification actions including neutralization to pH 6-8 and filtration through 0.2-0.5 μm filters before hydrogenation. This removes impurities that would cause by-product formation, thereby increasing hydrogenation yield without requiring complex multi-stage purification systems after reaction.
Solution Approach 2:
The patent introduces an intermediary purification system with neutralization tanks and filtration units between raw material storage and the hydrogenation reactor. This intermediary system efficiently removes impurities before they can interfere with the hydrogenation reaction, improving yield while maintaining reasonable process complexity.
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
Reduces by-product generation, maintains low acid value, and prolongs catalyst life, resulting in high-purity and high-quality hydrogenated phthalate compounds suitable for plasticizers.
Implementation Method 1
conducting hydrogenation of the hydrogen and phthalate based compound in the presence of a hydrogenation catalyst
Implementation Method 2
includes neutralization and filtration steps to minimize impurities
Implementation Method 3
includes neutralization and filtration steps to minimize impurities
Data Source
AI summary
This invention relates to a process for hydrogenation of a phthalate based compound. According to the invention, generation of by-products is inhibited during hydrogenation, and thus, catalytic activity is improved and life is prolonged, thereby increasing efficiency and economical feasibility of the industrial process. And, since the hydrogenation product prepared according to the invention has high purity and low acid value, it has excellent qualities as a plasticizer, and thus, can be used for various products.