Continuous Polyether Amine Production with Fixed-Bed Catalytic Amination
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Solution Overview
Problem
Existing polyether amine production in China relies on intermittent processes with low conversion rates, poor product quality, and is dominated by foreign companies, limiting domestic applications and market access.
Innovation Solution
A system and method using a fixed bed reactor with a cordierite and γ-Al2O3 supported noble metal and lanthanide metal three-way catalyst for catalytic amination of polyether diol, involving pressurization, preheating, and controlled feeding of reactants at specific temperatures and pressures, achieving a continuous process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If intermittent process is used for polyether amine production, then process simplicity is maintained, but conversion rate is low and product quality is inferior
Solution Approach 1:
The patent implements a multi-stage preheating system before the reactor to preheat reactants to optimal temperatures. This preliminary action ensures that reactions proceed at controlled temperatures from the start, improving conversion rates and product quality while maintaining process simplicity through systematic pre-treatment of feedstocks.
Solution Approach 2:
The patent transitions from intermittent batch processing to continuous flow processing through the fixed bed reactor system. Reactants continuously flow through preheating stages and into the reactor, maintaining steady-state conditions that improve conversion rates and product consistency while simplifying overall process control compared to repeated batch cycles.
2Manufacturing precision
If continuous process is adopted for polyether amine production, then conversion rate and product quality are improved, but process complexity increases
Solution Approach 1:
The patent divides the heating and reaction process into distinct segments: a multi-stage preheating system followed by a separate fixed bed reactor section. This segmentation allows each stage to be optimized independently - preheating ensures proper temperature profiles while the reactor focuses on high-quality product formation - thereby achieving high manufacturing precision without excessive overall complexity.
Solution Approach 2:
The patent introduces a multi-stage preheating system as an intermediary between raw material feeding and the main reaction in the fixed bed reactor. This intermediary component prepares reactants by gradual heating, ensuring optimal conditions for high-quality product formation while protecting the main reactor from thermal shocks and simplifying its design requirements.
3Productivity
If foreign continuous production technology is used, then high conversion rate and product quality are achieved, but market access is restricted and costs increase
Solution Approach 1:
The patent employs a fixed bed reactor with catalyst that can be easily replaced or regenerated. Rather than requiring complex, expensive continuous production systems like those from foreign companies, this approach uses simpler, more affordable reactor technology with disposable or regenerable catalyst beds, achieving high conversion rates while maintaining ease of manufacture and reducing capital costs.
Solution Approach 2:
The patent optimizes reaction parameters including temperature gradients through multi-stage preheating, pressure conditions, and flow rates through the fixed bed reactor. By carefully controlling these parameters, the system achieves conversion rates and product qualities comparable to foreign continuous processes while using simpler, more manufacturable equipment suitable for domestic production conditions.
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 primary amine conversion rates of 95-99% and total amine values of 28-32 mgKOH/g, producing a colorless transparent liquid with improved quality and catalyst longevity, addressing the inefficiencies of existing intermittent processes.
Implementation Method 1
A system and method using a fixed bed reactor with a cordierite and γ-Al2O3 supported noble metal and lanthanide metal three-way catalyst for catalytic amination of polyether diol
Implementation Method 2
adjusting the temperature of a multi-stage preheater so that the feeding temperature of a raw material reaches 125 ̃135° C.
Implementation Method 3
pressurizing the internal pressure of the fixed bed reactor to 10 ̃13 MPa by a hydrogen gas
Data Source
AI summary
Provided are a system and a method for preparing a polyether amine by catalytic amination of a polyether diol. The preparation method includes: filling a catalyst into the fixed bed reactor; pressurizing the internal pressure of the fixed bed reactor to 10˜13 MPa by a hydrogen gas, and raising the temperature of the fixed bed reactor to 150˜185° C.; adjusting the temperature of the multi-stage preheater so that the feeding temperature of a raw material reaches 125˜135° C.; and simultaneously feeding a polyether diol, liquid ammonia and the hydrogen gas into the multi-stage preheater, and after mixing and preheating, introducing into the fixed bed reactor from the feed inlet of the fixed bed reactor for a continuous catalytic amination reaction. The total amine value of the polyether amine finally obtained by the present invention reaches 28˜32 mgKOH/g, the color reaches 10˜20, and it is colorless transparent liquid.