Liquid-Phase Hydroisomerization System with Dissolved Hydrogen Replenishment
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Solution Overview
Problem
Current hydroisomerization processes require large amounts of hydrogen, leading to high costs and complexity due to the need for hydrogen recycling and high-pressure compressors, especially in three-phase systems, and existing two-phase systems still consume significant hydrogen, necessitating additional solvents or diluents, which increase reactor size and expense.
Innovation Solution
A liquid-phase hydroisomerization system comprising a hydrogen-dissolving unit, a hydroisomerization reactor with internal dissolved-hydrogen replenishment members, and a fractionating column, where hydrogen is dissolved in the oil feed and replenished as needed, maintaining a continuous liquid phase and reducing hydrogen consumption by eliminating the need for hydrogen recycling compressors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a three-phase reaction system with gas phase continuous hydrogen is used to maintain high hydrogen partial pressure, then hydrogenation reaction is favored and coke formation is inhibited, but a large amount of hydrogen is required which increases complexity and expense due to hydrogen recycle compressors and high energy consumption
Solution Approach 1:
The invention changes the physical state parameter of hydrogen from gas phase to dissolved liquid phase. By dissolving hydrogen in the liquid hydrocarbon feedstock, the system eliminates the need for gas phase hydrogen circulation while maintaining sufficient hydrogen availability for the reaction. This parameter change resolves the contradiction by removing the complex hydrogen recycling equipment while ensuring catalyst protection through adequate hydrogen supply.
Solution Approach 2:
The invention uses hydraulic principles by dissolving hydrogen gas into the liquid hydrocarbon stream, creating a saturated or supersaturated hydrogen solution that flows through the reactor. This hydraulic approach replaces the pneumatic gas phase hydrogen circulation system, eliminating compressors and heat exchangers while maintaining hydrogen delivery to the catalyst.
2Quantity of substance
If large amounts of hydrogen are pressurized and recirculated through hydrogen recycle compressors, then hydrogen supply is maintained, but investment cost and energy consumption increase significantly
Solution Approach 1:
The invention applies preliminary action by pre-dissolving hydrogen into the hydrocarbon feedstock before it enters the reactor. This pre-saturation step ensures that hydrogen is already in the liquid phase and ready for reaction, eliminating the need for continuous high-pressure recirculation and the energy-intensive compression process throughout operation.
Solution Approach 2:
The invention replaces the mechanical hydrogen compression and recirculation system with a chemical dissolution process. Instead of using compressors to maintain high-pressure gas phase hydrogen, the system uses hydrogen solubility in liquid hydrocarbons to deliver hydrogen to the reactor, substituting mechanical energy with chemical equilibrium.
3Quantity of substance
If existing two-phase systems are used to reduce hydrogen consumption, then hydrogen usage is lowered, but additional solvents or diluents are required which increase reactor size and expense
Solution Approach 1:
The invention makes the hydrocarbon feedstock serve multiple functions: it acts as both the reactant carrier and the hydrogen solvent. By utilizing the feedstock's inherent ability to dissolve hydrogen, the system eliminates the need for separate solvent or diluent systems, avoiding additional reactor volume requirements while achieving reduced hydrogen consumption.
Solution Approach 2:
The invention applies self-service by allowing the hydrocarbon feedstock to automatically dissolve and carry hydrogen without requiring external solvents. The feedstock itself becomes the hydrogen delivery medium through its natural solubility properties, eliminating the need for additional system components and reducing overall reactor size.
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 significantly reduces hydrogen usage, simplifies the process, lowers investment costs, and maintains a stable reaction rate and iso-paraffin yield, while reducing the clouding, pour, and solidification points of hydrocarbon raw materials.
Implementation Method 1
hydrogen is dissolved in the oil feed and replenished as needed, maintaining a continuous liquid phase
Implementation Method 2
hydroisomerization de-waxing reaction
Implementation Method 3
hydroisomerization of hydrocarbon raw materials
Implementation Method 4
fractionating column
Data Source
AI summary
Provided are a liquid-phase hydroisomerization system and a process therefor and use thereof. The system comprises a gas-liquid mixer (3), a hydroisomerization reactor (4) and a fractionating column (6). An oil product and hydrogen are mixed as a liquid hydrogen-oil mixture, and are introduced into the hydroisomerization reactor for a hydroisomerization reaction, and after being fractionated, a target product is led out. A supplemental hydrogen-dissolving inner member is provided at least between a group of two adjacent catalyst bed layers in order to supplement hydrogen to the reactants. The process cancels a circulating hydrogen compressor, has a simple process flow, and can be applied to the production of a lubricant base oil by the hydroisomerization of a lubricant raw material or the production of a low freezing point diesel by the hydroisomerization of and the reduction in the freezing point of a diesel raw material.