Zeolite Reactor Bed Feed Distribution for Low-Oxygenate Gasoline
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Solution Overview
Problem
Existing methods for producing gasolines and aromatic compound concentrates face challenges such as high oxygenate consumption, the need for additional heat supply, gaseous product recycling, and inefficient handling of low-demand hydrocarbon fractions, leading to increased costs and potential catalyst poisoning.
Innovation Solution
A method involving three reaction zones with zeolite catalysts, where a hydrocarbon fraction, oxygenate, and olefin-containing fraction are processed, with the olefin fraction partially replacing oxygenates, allowing for efficient conversion and distribution across zones to produce high-octane products without recycling gaseous products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If oxygenates are used in high amounts for gasoline production, then the octane rating is improved, but the production cost increases and environmental concerns arise
Solution Approach 1:
The invention changes the chemical composition parameters of the feedstock by incorporating olefin-containing fractions (10-50 wt% olefins) to replace oxygenates. This substitution maintains the octane rating while reducing oxygenate consumption, as olefins provide similar octane enhancement without the environmental drawbacks of oxygenates
Solution Approach 2:
The invention uses olefin-containing fractions as a substitute that copies the functional effect of oxygenates (octane enhancement) without requiring the actual oxygenate substances. The olefins perform the same role in improving gasoline quality but with better environmental properties and lower cost
2Ease of manufacture
If low-demand hydrocarbon fractions are processed using conventional methods, then the production process is simplified, but the catalyst becomes poisoned and conversion efficiency decreases
Solution Approach 1:
The invention applies different quality requirements to different feedstock components by directing low-demand hydrocarbon fractions containing C6 and C7 isoparaffins to specific reaction zones with appropriate catalysts. This localized approach allows these challenging fractions to be processed effectively without poisoning the overall catalyst system
Solution Approach 2:
The invention introduces olefin-containing fractions as intermediaries that facilitate the processing of low-demand hydrocarbon fractions. The olefins act as mediators in the reaction zones, enabling better conversion of difficult-to-process fractions while protecting the catalyst from poisoning
3Productivity
If gaseous products are recycled to improve conversion, then the overall yield increases, but the process complexity and equipment requirements increase
Solution Approach 1:
The invention performs preliminary action by ensuring high conversion of C2-C4 olefins (95-99%) in the first pass through the reaction zones. This preliminary conversion eliminates the need for recycling gaseous products, as the olefins are already converted to liquid products before reaching the separation and potential recycling stage
4Productivity
If additional heat supply is provided to maintain reaction temperature, then the conversion efficiency is improved, but the energy consumption and production cost increase
Solution Approach 1:
The invention merges the heat generation from exothermic reactions with the heat requirements of subsequent reaction zones. The heat released in earlier zones is utilized to maintain temperatures in later zones, reducing the need for additional external heat supply and lowering overall energy consumption
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
Reduces oxygenate consumption, enables the use of low-value hydrocarbon fractions, achieves high conversion of C2-C4 olefins, and produces gasoline or aromatic concentrates with reduced benzene content and improved octane rating.
Implementation Method 1
A method involving three reaction zones with zeolite catalysts, where a hydrocarbon fraction, oxygenate, and olefin-containing fraction are processed
Data Source
AI summary
The invention refers to the method for producing gasolines or aromatic compound concentrates, where three streams are used as feedstock, one of which includes hydrocarbon fraction, the second stream includes oxygenate, the third stream includes olefin-containing fraction with one or more olefins selected from the group consisting of ethylene, propylene, normal butylenes, isobutylene, in total from 10 to 50 wt %, and where three reaction zones filled with zeolite catalyst are used, with distribution of hydrocarbon fraction and oxygenate to the first reaction zone, and with olefin-containing fraction distributed over the three reaction zones, with the third stream mass fraction distributed to the final reaction zone higher than the mass fraction of the third stream distributed to each of the previous reaction zones. This method allows to increase the yield of C5+ hydrocarbons, enhance n-hexane and n-heptane conversion, reduce benzene content in the product, avoid recycling of gaseous products and decrease consumption of oxygenates. 1 independent claim and 35 dependent claims in the formula, 12 examples, 7 tables.