Mesoporous Carbon Catalyst for Phosgene Production Stability
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Solution Overview
Problem
Existing phosgene production processes face challenges with catalyst deactivation and low activity due to mass transport limitations, leading to reduced catalyst lifetime and increased formation of undesired side products like carbon tetrachloride.
Innovation Solution
A carbon catalyst with a high mesopore volume of 0.45 ml/g in the range of 2 to 50 nm is used, optimizing the pore structure to enhance catalytic activity and reduce deactivation, with a tailored blend of micropores and mesopores for improved heat transfer and reduced side product formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional carbon catalysts with low mesopore volume are used, then catalyst cost is reduced, but catalyst deactivation occurs frequently and catalyst activity decreases
Solution Approach 1:
The patent applies porous materials by designing a carbon catalyst with optimized pore structure, specifically ensuring mesopore volume is at least 0.45 ml/g. This porous structure allows better mass transport of reactants and products, reducing catalyst deactivation and maintaining high catalytic activity over extended periods.
Solution Approach 2:
The patent changes physical parameters of the catalyst by specifying mesopore volume ≥0.45 ml/g and surface area ≥600 m²/g. These parameter changes transform the catalyst performance, enabling it to resist deactivation while maintaining high activity, thus resolving the contradiction between reliability and productivity.
2Productivity
If conventional catalysts are used, then mass transport limitations occur, but increasing pore volume increases catalyst production cost
Solution Approach 1:
The patent utilizes porous materials with specifically engineered mesopore structures to eliminate mass transport limitations. The mesopores provide efficient pathways for reactant diffusion and product removal, maintaining high reaction rates without requiring excessive pore volume that would increase manufacturing complexity and cost.
Solution Approach 2:
The patent employs composite materials by combining carbon-based catalyst support with optimized pore architecture. This composite structure achieves both high productivity through improved mass transport and reasonable manufacturing cost by using carbon materials that can be produced at scale with controlled porosity.
3Object-generated harmful factors
If catalysts with insufficient mesopores are used, then carbon tetrachloride formation increases, but improving mesopore structure increases process complexity
Solution Approach 1:
The patent applies porous materials with controlled mesopore architecture to minimize carbon tetrachloride formation. The mesopores facilitate proper reactant distribution and product removal, preventing side reactions. The structure is designed to be manufacturable, balancing performance improvement with acceptable process complexity.
4Productivity
If catalyst activity is maintained at high levels, then chlorine conversion is incomplete, but reducing activity improves conversion efficiency
Solution Approach 1:
The patent changes catalyst parameters (mesopore volume ≥0.45 ml/g, surface area ≥600 m²/g) to achieve optimal performance where high productivity and complete chlorine conversion are simultaneously realized. The optimized pore structure ensures neither mass transport limitations nor excessive activity cause problems.
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 process achieves higher catalyst activity, longer lifetime, and decreased formation of carbon tetrachloride, resulting in increased yield and safer, more efficient phosgene production.
Implementation Method 1
a catalytic gas phase reaction of carbon monoxide and chlorine in the presence of a catalyst
Implementation Method 2
The increased mesopore volume minimizes mass transport limitations
Implementation Method 3
Heat management within the reactor is one of the main challenges in phosgene production necessary for performing a safe and economic process
Data Source
AI summary
The invention relates to a process for the production of phosgene comprising a gas phase reaction of carbon monoxide and chlorine in the presence of a carbon catalyst in a multi-tubular reactor, wherein the carbon catalyst comprises an amount of mesopores having a pore diameter in the range of from 2 to 50 nm of at least 0.45 ml/g of the total pore volume and the use of a carbon catalyst comprising an amount of mesopores having a pore diameter in the range of from 2 to 50 nm of at least 0.45 ml/g of the total pore volume, for the production of phosgene and a reaction mixture for preparing phosgene, the mixture comprising a catalyst for preparing phosgene comprising a porous material comprising carbon, micropores and mesopores, wherein said micropores have a pore diameter of less than 2 nm and wherein said mesopores have a pore diameter in the range of from 2 to 50 nm, wherein the volume of the mesopores of the porous material is of at least 0.45 ml/g, and a gas stream G comprising carbon monoxide (CO) and chlorine (Cl2).