Hydrotreatment Catalyst Deactivation Reduction by Impurity Precipitation
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Solution Overview
Problem
Hydrotreatment catalysts used in producing renewable hydrocarbons from low-quality feedstocks are prone to rapid deactivation due to impurities like phosphorus and metals, leading to shortened catalyst life cycles and increased production interruptions.
Innovation Solution
Adjust the metal to phosphorus (M:P) weight ratio of the feedstock to a range of 0.70 to 1.26, subject the feedstock to elevated temperatures under reducing conditions to form a solid precipitate, and contact the purified liquid feedstock with the main active catalyst in the presence of hydrogen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If pre-treatment technologies are used to remove impurities, then the amount of impurities is decreased, but it is impossible to completely avert the fouling of hydrotreatment catalyst
Solution Approach 1:
The patent changes the chemical parameters of the feedstock by adjusting the metal to phosphorus weight ratio to a specific range (0.70-1.26). This parameter adjustment causes metal phosphates to precipitate from the feedstock, removing impurities that would otherwise foul the catalyst. The precipitation process transforms dissolved impurities into solid particles that can be easily separated, thereby protecting the catalyst while using low-quality feedstock.
Solution Approach 2:
The patent converts the harmful effect of metal and phosphorus impurities into a beneficial process. Instead of viewing these impurities as merely problematic substances to be removed, the method utilizes their interaction to form metal phosphate precipitates. These precipitates are then removed, effectively cleaning the feedstock. The harmful impurities become the mechanism for their own removal, protecting the catalyst without requiring extensive pre-treatment.
2Adaptability or versatility
If lower quality feedstocks are used to increase sustainability, then feedstock supply is broadened, but catalyst deactivation is accelerated
Solution Approach 1:
The patent enables the use of diverse low-quality feedstocks by changing the chemical parameter of the feedstock composition. By adjusting the metal to phosphorus weight ratio to the optimal range, the process allows feedstocks with high impurity content to be converted into valuable products. The parameter change triggers precipitation of metal phosphates, protecting the catalyst and enabling long operation times even with versatile, low-quality feedstock inputs.
Solution Approach 2:
The patent performs preliminary action by adjusting the metal to phosphorus ratio and inducing precipitation before the feedstock contacts the main hydrotreatment catalyst. This pre-treatment step removes harmful impurities in advance, preventing catalyst deactivation. The preliminary precipitation process ensures that when the purified feedstock enters the catalytic reactor, the catalyst remains active for extended periods, thus prolonging catalyst life cycle while maintaining feedstock versatility.
3Duration of action of stationary object
If catalyst deactivation is reduced by removing impurities, then catalyst lifetime is extended, but production interruptions are still required periodically
Solution Approach 1:
The patent changes the feedstock composition parameters by controlling the metal to phosphorus weight ratio, which induces precipitation of metal phosphates. This chemical parameter adjustment effectively removes impurities that cause catalyst deactivation. As a result, catalyst lifetime is extended significantly, reducing the frequency of production interruptions. The parameter-driven precipitation process creates a more stable operating condition that minimizes downtime.
Solution Approach 2:
The patent performs preliminary impurity removal through precipitation before the feedstock enters the catalytic reactor. By removing metal and phosphorus impurities in advance, the catalyst operates in a cleaner environment, maintaining high activity for longer periods. This preliminary action reduces the need for frequent catalyst replacement or regeneration, thereby minimizing production interruption time and loss.
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 method reduces catalyst deactivation, prolongs catalyst life, and allows for higher throughput by precipitating impurities before they reach the catalyst, thereby minimizing production losses.
Implementation Method 1
subjecting the impurity adjusted renewable feedstock to a temperature from 190 to 400° C. under reducing conditions, thereby forming a solid precipitate comprising at least one metal and phosphorus containing compound
Data Source
AI summary
The present invention relates to a method for reducing deactivation of a hydrotreatment catalyst. The hydrotreatment catalyst is used as a main active catalyst for producing renewable hydrocarbons by hydrotreatment from a renewable feedstock which comprises at least an oxygen containing compound, at least one metal containing compound and at least one phosphorus containing compound as impurities. The method comprising adjusting the metal to phosphorus (M:P) weight ratio of the renewable feedstock to a value within the range from 0.70 to 1.26, measured as elemental metal and elemental phosphorus, subjecting the obtained feedstock to a temperature of from 190 to 400° C. under reducing conditions, thereby forming a solid precipitate comprising at least one metal and phosphorus containing compound, and contacting the obtained liquid renewable feedstock with the main active catalyst, in the presence of hydrogen.