Hydrocarbon Polymerization Evaporative Cooling Reactor
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Solution Overview
Problem
Conventional polymerization and oligomerization processes face challenges with heat removal and fouling issues, particularly due to the need for heat exchangers and agitators that are susceptible to fouling, which can lead to reduced efficiency and increased maintenance costs.
Innovation Solution
A process involving the use of a bubbling column reactor where a liquid hydrocarbon reactant and a liquid evaporative cooling medium vaporize to form bubbles, providing heat removal through latent heat and mixing, eliminating the need for a stirrer and reducing fouling risks, by recycling condensed reactant and cooling medium to maintain a stable bulk liquid phase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a heat exchanger is used to remove heat from the bulk liquid phase, then heat removal efficiency is improved, but fouling susceptibility increases
Solution Approach 1:
The patent replaces the mechanical heat exchanger system with a vaporization-based cooling system. Liquid reactant is introduced in a liquid state, vaporizes within the reaction zone to absorb heat, and the resulting vapor is then condensed externally. This substitution eliminates direct contact between the bulk liquid phase and heat exchange surfaces, thereby preventing fouling while maintaining efficient heat removal through the latent heat of vaporization.
Solution Approach 2:
The patent utilizes phase transition of the liquid reactant from liquid to vapor state within the reaction zone to achieve cooling. The vaporization process absorbs the exothermic heat of reaction, and the vapor subsequently condenses in an external condenser. This phase transition mechanism provides efficient heat removal without requiring fouling-prone heat exchange surfaces in contact with the bulk liquid phase.
2Stability of the object's composition
If an agitator is used to mix the bulk liquid phase, then mixing efficiency is improved, but fouling susceptibility increases
Solution Approach 1:
The patent replaces the mechanical agitation system with a vaporization-induced mixing system. Liquid reactant is introduced and rapidly vaporizes, creating vigorous local mixing and turbulence. The rising vapor bubbles and associated fluid dynamics provide adequate mixing without requiring mechanical agitators that would be susceptible to fouling by polymer deposits.
Solution Approach 2:
The rapid vaporization of liquid reactant introduces intense local turbulence and mixing action. The phase change from liquid to vapor creates vigorous fluid motion and eddies that effectively mix the reaction mixture without mechanical contact, thereby avoiding fouling of mixing components.
3Temperature
If external cooling utilities are used to cool the bulk liquid phase, then temperature control is improved, but process complexity increases
Solution Approach 1:
The patent implements a self-cooling mechanism where the liquid reactant serves its own cooling function through vaporization. The reactant absorbs heat from the bulk liquid phase as it vaporizes, and the resulting vapor is condensed externally with the condensate being recycled back to the reaction zone. This self-service cooling approach eliminates the need for separate external cooling utilities while maintaining effective temperature control.
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 approach maintains isothermal conditions, reduces fouling, and eliminates the need for external cooling utilities, enhancing process efficiency and reducing maintenance requirements, while allowing plant cooling water to be used for condensation, providing a cost-effective solution.
Implementation Method 1
allowing at least a portion of the liquid hydrocarbon reactant and the liquid evaporative cooling medium to vapourise to form bubbles rising through the bulk liquid phase, with the hydrocarbon reactant polymerising or oligomerising to form the polymeric or oligomeric product and with the evaporation of both the liquid hydrocarbon reactant and the liquid evaporative cooling medium effecting heat removal from the bulk liquid phase
Implementation Method 2
with the evaporation of both the liquid hydrocarbon reactant and the liquid evaporative cooling medium effecting heat removal from the bulk liquid phase
Implementation Method 3
cooling the gaseous components withdrawn from the head space, forming condensed hydrocarbon reactant and condensed cooling medium and gaseous product
Data Source
AI summary
A process for polymerizing or oligomerizing a hydrocarbon includes feeding a liquid hydrocarbon reactant and a liquid evaporative cooling medium into a bulk liquid phase which includes polymeric or oligomeric product admixed with a catalyst, and allowing at least a portion of the liquid hydrocarbon reactant and the liquid evaporative cooling medium to vaporize to form bubbles rising through the bulk liquid phase, with the hydrocarbon reactant polymerizing or oligomerizing to form the polymeric or oligomeric product and with the evaporation of both the liquid hydrocarbon reactant and the liquid evaporative cooling medium effecting heat removal from the bulk liquid phase. Gaseous components are withdrawn from a head space, cooled and separated. Condensed hydrocarbon reactant and condensed cooling medium are recycled to the bulk liquid phase.