Hydrocracking Kerosene to Naphtha Ratio Control
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Solution Overview
Problem
Modular refineries face challenges in producing gasoline that meets market specifications due to varying feedstock properties and the need for cost-effective processes, as blending fractions alone does not ensure compliance with market requirements.
Innovation Solution
A process involving hydrocracking of kerosene in the presence of hydrogen and a catalyst, adjusting conditions to maintain a light naphtha to heavy naphtha ratio of at least 2 by weight, and varying hydrocracking temperature to optimize the yield of liquefied petroleum gas and heavy naphtha fractions, ensuring a net conversion of at least 90% and meeting gasoline pool blend requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If blending fractions alone is used to produce gasoline, then the process is simple, but the gasoline pool does not meet market specifications
Solution Approach 1:
The patent applies parameter changes by adjusting hydrocracking conditions (temperature, pressure, LHSV) to control the ratio of light to heavy naphtha fractions. By varying these parameters, the process produces naphtha streams with specific composition ranges that, when blended, meet gasoline specifications including octane rating and volatility requirements.
2Quantity of substance
If a separate hydrocracking unit is set up to convert kerosene to naphtha, then valuable petrochemical products can be produced, but capital expenditure increases
Solution Approach 1:
The patent implements multi-functionality by enabling existing hydrocracking units to process multiple feedstocks (kerosene, distressed hydrocarbons, naphtha) and produce multiple products (gasoline blendstock, petrochemical feedstock). This eliminates the need for separate dedicated units while maintaining flexibility in product distribution according to market demands.
Solution Approach 2:
The patent applies dynamics by making the hydrocracking process adjustable and flexible through variable operating conditions. The ability to dynamically change temperature, pressure, and feed rate allows the same unit to optimize for different feedstocks and product slates, replacing static dedicated infrastructure with adaptable equipment.
3Use of energy by moving object
If kerosene is used as domestic fuel, then energy demand is met, but emission regulations are violated
Solution Approach 1:
The patent converts the harmful aspect of kerosene combustion (emissions) into a benefit by using kerosene as a feedstock for hydrocracking to produce clean-burning gasoline and valuable petrochemicals. This transforms the problematic fuel stream into high-value products that meet environmental standards while maintaining energy production.
4Ease of operation
If the ratio of light naphtha to heavy naphtha is not controlled, then the hydrocracking process is simple to operate, but the gasoline pool cannot achieve the required octane rating
Solution Approach 1:
The patent implements feedback control by monitoring the ratio of light to heavy naphtha fractions produced during hydrocracking and adjusting operating conditions (temperature, pressure, LHSV) to maintain the optimal ratio for achieving target octane ratings. This closed-loop approach ensures consistent product quality while managing 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
This process allows for the production of a naphtha stream that meets market specifications for gasoline, adjusting the ratio of light to heavy naphtha fractions to achieve the required octane rating and yield, thereby enhancing the flexibility and efficiency of gasoline production.
Implementation Method 1
The kerosene stream is hydrocracked in the presence of a hydrogen stream and a hydrocracking catalyst in the hydrocracking reactor
Implementation Method 2
The kerosene stream is hydrocracked in the presence of a hydrogen stream and a hydrocracking catalyst
Data Source
AI summary
Process and apparatus for producing a naphtha stream is provided. The process comprises providing a kerosene stream to a hydrocracking reactor. The kerosene stream is hydrocracked in the presence of a hydrogen stream and a hydrocracking catalyst in the hydrocracking reactor at hydrocracking conditions comprising a hydrocracking pressure, a hydrocracking temperature, and a liquid hourly space velocity at a net conversion of at least about 90%, to provide a hydrocracked effluent stream comprising liquefied petroleum gas, heavy naphtha fraction and light naphtha fraction. One or more of the hydrocracking conditions are adjusted to maintain a ratio of the light naphtha fraction to the heavy naphtha fraction of at least about 2 by weight, suitably at least about 2.2 and preferably at least about 2.5 in the hydrocracked effluent stream while maintaining the net conversion of at least about 90%.