Hydrogenation Catalyst Presulfurization via Organonitrogen Mediator
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing hydrogenation catalysts face inefficiencies in presulfurization processes, particularly in ex situ methods, where there are issues with sulfur-maintaining ratio, concentrative heat release, and safety concerns during storage, transportation, and activation.
Innovation Solution
An ex situ presulfurization process involving the use of an organonitrogen compound and an organic solvent, along with a sulfiding agent, is applied to the hydrogenation catalyst, with a step-wise heat treatment in an inert or oxygen atmosphere to achieve homogeneous heat release and high sulfur-maintaining ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ex situ presulfurization is used to improve production efficiency, then presulfurization time is reduced, but sulfur-maintaining ratio decreases and concentrative heat release occurs
Solution Approach 1:
The patent introduces an organonitrogen compound as an intermediary substance that mediates between the sulfiding agent and the catalyst metal. This compound first interacts with the sulfiding agent, then gradually releases sulfur to the catalyst metal during step-wise heat treatment, preventing both sulfur loss and concentrative heat release while maintaining high sulfur-maintaining ratio
Solution Approach 2:
The patent performs preliminary action by pre-complexing the sulfiding agent with the organonitrogen compound before contacting with the catalyst. This pre-preparation ensures controlled sulfur release during activation, avoiding both sulfur loss and excessive heat release while maintaining high productivity
2Productivity
If ex situ presulfurization with sulfiding agent is applied to reduce presulfurization time, then production efficiency improves, but concentrative exothermic phenomenon occurs during activation
Solution Approach 1:
The patent segments the sulfur transfer process into multiple controlled stages by using the organonitrogen compound as an intermediate carrier. The step-wise heat treatment divides the activation process into stages (ambient to 100°C, 100-200°C, 200-400°C), with sulfur release occurring gradually at each stage, preventing concentrative exothermic phenomenon
Solution Approach 2:
The patent implements periodic action through step-wise heat treatment with multiple temperature stages. Each stage allows controlled sulfur release and reaction, creating periodic cycles of heating and reaction that prevent excessive heat accumulation while maintaining efficient presulfurization
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 enhances catalytic performance by maintaining high sulfur levels and reducing exothermic phenomena, ensuring the catalyst's stability and ease of handling, while improving hydrogenating properties such as hydrodesulfiding and hydrodenitrifying activities.
Implementation Method 1
supporting an organonitrogen compound onto a hydrogenation catalyst... supporting an organic solvent and a sulfiding agent onto the hydrogenation catalyst containing the organonitrogen compound
Implementation Method 2
The catalyst composition obtained in step (2) is heat treated, wherein the heat treatment lasts for 0.2-15h at 100-130℃, then for 0.2-15h at 130-180℃
Implementation Method 3
the active metal components of the catalyst have higher reaction properties when presenting in a sulfurization state (metals are present in the form of sulfides)... the catalyst needs to be presulfurized and converted to the sulfurization state thereof
Data Source
Figure 1~2
AI summary
The present invention relates to a hydrogenation catalyst composition, process for preparing the same and use thereof. The composition comprises a hydrogenation catalyst, an organonitrogen compound in an amount of 0.01%-20% by weight of the catalyst, a sulfiding agent in an amount of 30%-150% by weight of the sulfur-requiring amount calculated theoretically of the hydrogenation catalyst, and an organic solvent in an amount of 0.1%-50% by weight of the catalyst. The preparation process comprises introducing the required substances onto the hydrogenation catalyst in oxidation state. By introduction of the organonitrogen compound, sulfur and organic solvent, the hydrogenation catalyst composition of the present invention may further increase the sulfur-maintaining ratio of the catalyst during the activation, slow down the concentrative exothermic phenomenon, decrease the rate of temperature rise of the catalyst bed layer, and improve the activity of the catalyst. The process of the present invention may be used for the treatment before the application of various hydrogenation catalysts.