Alkylation Catalyst Composition Analysis via Density and Spectroscopy
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Solution Overview
Problem
Existing methods for online analysis of alkylation catalysts in petroleum refineries face challenges due to variable hydrocarbon composition, which affects measurement accuracy and reliability, and are hindered by complex and unreliable sampling systems prone to corrosion and leakage.
Innovation Solution
The apparatus includes a liquid flow path for separating hydrocarbon and acid catalyst phases, using a density detector and spectrometer to measure the acid catalyst's density and spectrum, with a processor calculating weight fractions of acid, water, and hydrocarbons through specific equations, and is designed for continuous online analysis, avoiding the limitations of prior art by compensating for variable hydrocarbon densities and spectral responses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chemometric-based NIR or Raman methods are used to analyze HF catalyst, then continuous online analysis is achieved, but measurement accuracy deteriorates due to variable hydrocarbon composition effects
Solution Approach 1:
The patent introduces an intermediary mathematical model that separates the effects of hydrocarbon composition variables from the actual catalyst composition measurements. By using a correction factor based on measured hydrocarbon density and composition, the system mediates between the raw spectral data and the final composition calculation, eliminating the accuracy deterioration caused by variable hydrocarbon composition.
Solution Approach 2:
The patent dynamically adjusts measurement parameters by continuously monitoring hydrocarbon density and composition, then using these parameters to correct the catalyst composition calculations. This parameter change approach transforms the fixed calibration models into adaptive models that compensate for varying hydrocarbon effects, maintaining measurement accuracy while enabling continuous analysis.
2Measurement precision
If manual sampling and laboratory analysis are used for HF catalyst, then measurement accuracy is maintained, but operator safety deteriorates due to toxic exposure
Solution Approach 1:
The patent replaces the mechanical manual sampling system with an automated online analysis system using NIR or Raman spectroscopy. This substitution eliminates the need for operators to physically collect and handle HF catalyst samples, removing the toxic exposure hazard while maintaining or improving measurement accuracy through continuous automated monitoring.
Solution Approach 2:
The patent creates an optical copy of the catalyst composition information through spectral measurement, rather than requiring physical transfer of the actual catalyst sample to a laboratory. This copying approach allows accurate composition determination without operator contact with toxic materials, as the spectral data serves as a surrogate for direct sample analysis.
3Productivity
If complex sampling systems with tubing and valves are used for online analysis, then continuous monitoring is achieved, but system reliability deteriorates due to corrosion and leakage
Solution Approach 1:
The patent extracts the analysis function from the process stream by using non-contact or minimal-contact spectroscopic measurement. By taking out the need for extensive tubing and valve systems that physically transport samples, the invention eliminates the corrosion and leakage problems while maintaining continuous monitoring capability through direct in-line or near-in-line spectral analysis.
Solution Approach 2:
The patent introduces light (NIR or Raman radiation) as an intermediary that transfers information about catalyst composition without requiring physical contact between the measurement system and the corrosive HF catalyst. This intermediary approach enables continuous monitoring while eliminating the reliability issues associated with corrosive environments affecting mechanical sampling components.
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 approach provides accurate and reliable continuous online analysis of alkylation catalyst composition, reducing operator exposure to toxic substances and minimizing maintenance needs, while improving the operational efficiency and safety of alkylation unit operations.
Implementation Method 1
an optical flow cell in optical communication with a spectrometer for measuring the spectrum of the acid catalyst
Implementation Method 2
through a density detector for measuring the density of the acid catalyst phase
Implementation Method 3
a liquid flow path configured to convey the continuously flowing process liquid from an alkylation process to a liquid-liquid separator for separating the liquid hydrocarbon phase from the liquid acid catalyst phase
Data Source
AI summary
Apparatus and method for the determination of weight fractions of hydrocarbons, water and acid in the acid catalyst phase of petroleum refinery alkylation catalyst streams by flowing the acid catalyst phase through a density detector and a spectrometer cell so that the determination can be made according to first principles. An alternative apparatus and method uses spectroscopy without the density detector.