Catalyst Composition for Oxygenate Conversion to Aromatics
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Solution Overview
Problem
Conventional processes for converting oxygenates to aromatic hydrocarbons, such as methanol to C6-C8 aromatics, face challenges in increasing the relative amount of C6-C8 aromatics while minimizing catalyst deactivation and the production of durene, which requires extensive treatment and is toxic.
Innovation Solution
A catalytic process using a catalyst comprising ≥10.0 wt. % of a molecular sieve and ≥0.1 wt. % of an element from Groups 2-14 of the Periodic Table, with recycling and combining at least a portion of the aromatics in the hydrocarbon product to enhance aromatics yield without significant catalyst deactivation or durene increase, operated in a fluidized or moving bed reactor for continuous regeneration and higher temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional zeolite catalysts are used to convert oxygenates to aromatic hydrocarbons, then hydrocarbon production is achieved, but the relative amount of C6-C8 aromatics is limited and durene production increases
Solution Approach 1:
The patent modifies the catalyst composition by incorporating specific metal elements (Fe, Co, Ni, Cu, Zn, Ga, Al, B) at controlled concentrations to change the catalytic properties. This parameter change enables selective production of C6-C8 aromatics while suppressing durene formation, directly resolving the contradiction between aromatic yield and harmful byproduct generation
Solution Approach 2:
The patent creates a composite catalyst system combining molecular sieve materials with metal-containing compounds. This composite structure provides both the shape-selective properties of molecular sieves and the dehydrogenation activity of metal elements, achieving high C6-C8 aromatics selectivity without excessive durene production
2Productivity
If reaction temperature is increased to improve aromatics yield, then conversion efficiency increases, but catalyst deactivation rate increases
Solution Approach 1:
The patent optimizes the catalyst composition parameters (metal element types and concentrations) to enable high aromatics yield at moderate temperatures. By changing the catalytic parameters through specific metal incorporation, the system achieves high productivity without requiring excessive temperature increases that would cause catalyst deactivation
Solution Approach 2:
The patent develops a catalyst formulation that maintains high activity and selectivity over extended periods. The specific metal-containing composition provides resistance to deactivation, allowing continuous operation at high productivity levels without frequent catalyst replacement, effectively treating the catalyst as a durable component rather than disposable
3Quantity of substance
If recycling aromatics is implemented to increase aromatics content, then product quality improves, but catalyst deactivation may accelerate
Solution Approach 1:
The patent modifies the catalyst composition by incorporating metal elements that provide dehydrogenation functionality. This parameter change enables the catalyst to handle recycled aromatics without significant deactivation, as the metal sites facilitate controlled reactions that prevent excessive coking and maintain catalyst activity during recycling operations
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 an increased yield of C6-C8 aromatics without significant catalyst deactivation and minimal durene production, allowing for higher operating temperatures and continuous regeneration, thereby improving the efficiency and product quality.
Implementation Method 1
oxygenates can be catalytically converted to hydrocarbon products having an increased C6-C8 aromatics content
Implementation Method 2
utilizing one or more elements from Groups 2-14 of the Periodic Table provides the catalyst with a dehydrogenation functionality that surprisingly produces molecular hydrogen and an increased aromatics yield
Implementation Method 3
provides the catalyst with a dehydrogenation functionality that surprisingly produces molecular hydrogen and an increased aromatics yield, but without producing a significant amount of carbon monoxide and carbon dioxide
Data Source
AI summary
Processes for catalytically converting oxygenates to hydrocarbon products having an increased C6-C8 aromatics content therein. A first mixture comprising ≧10.0 wt. % of at least one oxygenate, based on the weight of the first mixture, contacts a catalyst in a fluidized bed reactor to produce a product stream including water, one or more hydrocarbons comprising ≧30.0 wt. % of aromatics, based on the weight of the hydrocarbons in the product stream, hydrogen, and one or more oxygenates. The catalyst comprises at least one molecular sieve, a binder, and at least one element selected from Groups 2-14 of the Periodic Table. At least one water-rich stream, at least one aromatic-rich hydrocarbon stream, and at least one aromatic-depleted hydrocarbon stream are separated from the product stream, and at least a portion of one of the aromatic-rich hydrocarbon stream or the aromatic-depleted hydrocarbon stream is recycled back to the reactor.