Functionalized Dendrimer Inhibits Gas Hydrate Plugging
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Solution Overview
Problem
Existing hydrate inhibitors for preventing gas hydrate plugging in conduits have low cloud point temperatures, leading to precipitation issues, and require high concentrations, which are costly and inefficient.
Innovation Solution
The use of functionalized hyper-branched polyester amides with quaternary ammonium end groups, which have a cloud point above 50°C, effectively inhibiting hydrate formation and accumulation in conduits without precipitating under operational conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hydrate inhibitors are used, then hydrate formation is inhibited, but the inhibitors precipitate at low temperatures due to low cloud point
Solution Approach 1:
The patent modifies the chemical parameters of the dendrimeric compound by introducing specific functional groups (ammonium, sulfonate, carboxylate) and adjusting molecular weight and generation levels. These parameter changes raise the cloud point temperature of the inhibitor, allowing it to remain soluble and effective at lower temperatures where conventional inhibitors would precipitate.
Solution Approach 2:
The patent creates a composite inhibitor system by combining dendrimeric compounds with specific functional groups in defined ratios. This composite structure integrates the hydrate inhibition capability of the dendrimeric core with the solubility-enhancing properties of the functional groups, achieving both effective hydrate inhibition and improved low-temperature solubility.
2Reliability
If substantial amounts of melting point depressants are added, then hydrate formation is prevented, but costs and storage requirements increase significantly
Solution Approach 1:
The patent employs dendrimeric compounds that function as kinetic hydrate inhibitors rather than thermodynamic antifreezes. These inhibitors work by adsorbing onto hydrate crystal surfaces and preventing their growth and aggregation, allowing effective hydrate prevention at much lower concentrations (typically 10-50 ppm) compared to the substantial amounts of methanol or glycols required for melting point depression.
Solution Approach 2:
The patent changes the mechanism of action parameter from thermodynamic (melting point depression requiring high concentrations) to kinetic (crystal growth inhibition requiring low concentrations). By modifying the molecular structure and functional groups of the dendrimeric compound, the inhibition efficiency is enhanced, allowing effective hydrate prevention at economically viable concentrations.
3Reliability
If polymeric inhibitors are used above their cloud point temperature, then solubility decreases drastically, but hydrate inhibition is needed
Solution Approach 1:
The patent systematically adjusts the cloud point temperature parameter of the dendrimeric compound by modifying its chemical structure, including the choice of core material, generation level, and functional groups. This parameter optimization ensures the cloud point is positioned above the operational temperature range, maintaining solubility and preventing precipitation while preserving hydrate inhibition capability.
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 functionalized hyper-branched polyester amides provide effective inhibition of hydrate formation and accumulation in conduits, preventing plugging while maintaining solubility at elevated temperatures, thus reducing costs and operational issues.
Implementation Method 1
adding crystal growth inhibitors and/or compounds, which are in principle capable of preventing agglomeration of hydrate crystals
Implementation Method 2
the water/hydrocarbon mixture is, under conditions of low temperature and elevated pressure, capable to form gas hydrate crystals
Data Source
AI summary
A method for inhibiting the plugging of a conduit containing a flowable mixture comprising at least an amount of hydrocarbons capable of forming hydrates in the presence of water and an amount of water, which method comprises adding to the mixture an amount of a functionalized dendrimer effective to inhibit formation and/or accumulation of hydrates in the mixture at conduit temperatures and pressures; and flowing the mixture containing the functionalized dendrimer and any hydrates through the conduit wherein the functionalized dendrimer comprises at least one ammonium functional end group.