Group VI VIII Metal Phosphorus Catalyst Solution Additive
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Solution Overview
Problem
Existing catalyst solutions for hydrotreating, hydrodesulfurization, and hydrodenitrogenation often experience precipitate formation during preparation, which is undesirable and limits their activity and effectiveness.
Innovation Solution
A solution composition comprising a Group VI metal, a Group VIII metal, and phosphorus, with a higher concentration of an additive that maintains a precipitate-free state, achieved through a process involving specific atomic ratios and the use of tetraethylene glycol or polyethylene glycol, optionally heated and cooled, to ensure effective impregnation and catalyst formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If phosphorus concentration is increased to improve catalyst activity, then catalyst activity is improved, but precipitate formation occurs
Solution Approach 1:
The patent introduces a specific additive (polyethylene glycol or tetraethylene glycol) as an intermediary substance that mediates between phosphorus and the metal components. This additive prevents precipitate formation by interfering with the interaction that would otherwise lead to precipitation, allowing high phosphorus concentrations to be maintained without the harmful effects observed in conventional formulations.
Solution Approach 2:
The patent changes the chemical composition parameters by introducing organic additives (polyethylene glycol or tetraethylene glycol) with specific molecular weights and concentrations. This parameter change fundamentally alters the solution chemistry, enabling the system to accommodate high phosphorus concentrations without precipitation by modifying the solubility and interaction characteristics of the components.
2Reliability
If additive concentration is increased to prevent precipitate, then precipitate formation is prevented, but solution cost increases
Solution Approach 1:
The patent optimizes the concentration parameters of the additive to achieve the minimum effective amount needed to prevent precipitation. By carefully selecting the additive concentration range and using heating/cooling cycles, the patent achieves reliable precipitate-free solutions with controlled additive amounts, balancing reliability with cost-effectiveness.
Solution Approach 2:
The patent applies preliminary heating and cooling actions to the solution before final use. This preliminary treatment ensures that the additive is fully effective in preventing precipitation during subsequent storage and application, eliminating the need for excessive additive concentrations and thereby reducing costs while maintaining reliability.
3Productivity
If phosphorus concentration is increased to improve catalyst properties, then catalyst properties are improved, but solution stability decreases
Solution Approach 1:
The additive serves as a stabilizing intermediary that maintains solution stability even at high phosphorus concentrations. It prevents the decomposition and precipitation that would otherwise occur, allowing the solution to remain stable and homogeneous throughout storage and application while maintaining the high phosphorus content needed for improved catalyst properties.
Solution Approach 2:
The patent applies preliminary heating and cooling cycles to ensure complete dissolution and stabilization of the high phosphorus content before the solution is used. This preliminary action establishes a stable molecular distribution that prevents subsequent precipitation, maintaining solution stability throughout the catalyst preparation process.
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 solution allows for higher phosphorus concentrations and improved catalyst properties, preventing precipitate formation and ensuring efficient impregnation, leading to enhanced activity in hydrotreating, hydrodesulfurization, and hydrodenitrogenation processes.
Implementation Method 1
A solution composition comprising a Group VI metal, a Group VIII metal, phosphorus, and an additive which is tetraethylene glycol or polyethylene glycol having an average molecular weight in the range of about 200 to about 400
Implementation Method 2
Optionally, the solution is heated at a temperature above 40°C to form a heated solution
Implementation Method 3
The heated solution is optionally cooled to form a cooled solution
Data Source
AI summary
This invention provides a process for forming a solution composition, which process comprises forming a primary solution by bringing together, in an aqueous medium, i) at least one phosphorus compound, ii) at least one Group VI metal compound, iii) at least one Group VIII metal compound, and iv) an additive which is a) tetraethylene glycol, b) polyethylene glycol having an average molecular weight in the range of about 200 to about 400, c) a mixture of tetraethylene glycol and polyethylene glycol having an average molecular weight in the range of about 200 to about 400, or d) a mixture of (1) tetraethylene glycol and/or polyethylene glycol having an average molecular weight in the range of about 200 to about 400 and (2) one or more of monoethylene glycol, diethylene glycol, and triethylene glycol. The molar ratio of additive to the total moles of Group VI metal and Group VIII metal is above 0.30:1, and the atomic ratio of phosphorus to Group VI metal is at least about 0.33: 1. Optionally, the primary solution is heated at a temperature above about 40°C to form a heated solution. The heated solution is optionally cooled to form a cooled solution. Also provided are compositions formed by such processes, processes for forming catalyst compositions from these compositions, and catalyst compositions formed by these processes.