Capillary Column Resistive Heating for Fast Chromatography
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Solution Overview
Problem
Current chromatography systems face challenges in efficiently handling and analyzing samples with varying concentrations and types, particularly in achieving precise temperature control and fast heating rates for capillary columns, which affects the accuracy and speed of analytical processes.
Innovation Solution
A chromatography apparatus featuring a capillary column with a small diameter wire coated in high-temperature insulating material, housed within a fiberglass sheath, and a temperature modulation circuit for precise resistive heating, along with a compact coil assembly on a low-mass aluminum ring, enables fast and accurate temperature feedback control and efficient heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional heating system is used for the capillary column, then the system structure is simple, but the temperature control precision and heating rate are insufficient
Solution Approach 1:
The patent replaces conventional mechanical heating systems with an electrical resistive heating system. A wire wrapped around the capillary column serves as a heating element, enabling precise temperature control through electrical resistance heating. This substitution allows for accurate temperature modulation while maintaining relatively simple system architecture.
Solution Approach 2:
The patent implements a feedback control mechanism where a temperature sensor continuously monitors the capillary column temperature and feeds this information back to a control system. The control system adjusts the heating power accordingly to maintain the desired temperature setpoint, achieving precise temperature control through closed-loop feedback.
2Speed
If the capillary column has large mass, then thermal stability is improved, but thermal transport delay increases and heating speed decreases
Solution Approach 1:
The patent changes the mass parameter of the capillary column by using a lighter material construction or optimized column dimensions. This reduction in mass enables faster heating rates while the feedback control system compensates to maintain thermal stability during operation.
Solution Approach 2:
The patent employs periodic heating cycles with controlled heating and cooling phases. During analysis, the system uses rapid heating when needed and maintains temperature stability through controlled cycling, allowing fast response while achieving thermal equilibrium during critical measurement periods.
3Productivity
If the capillary column is heated rapidly, then analysis speed is improved, but temperature uniformity deteriorates
Solution Approach 1:
The patent divides the heating function into multiple independent heating zones along the capillary column. Each zone can be controlled independently, allowing rapid heating of specific sections while maintaining temperature uniformity in other regions. This segmented approach enables fast analysis without compromising overall temperature distribution.
Solution Approach 2:
The patent applies different heating rates and temperature profiles to different sections of the capillary column based on local requirements. The injection port region may receive rapid heating while the detection region maintains stable, uniform temperature, optimizing both analysis speed and separation quality through localized temperature control.
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 configuration allows for rapid and precise temperature control of capillary columns, enhancing the accuracy and efficiency of chromatographic analyses by minimizing thermal transport delay and maintaining uniform temperature distribution, thereby improving the resolution and speed of component separations.
Implementation Method 1
the small diameter wire is at least one electrically conductive element co-linear with the column material... provides a very fast, accurate temperature feedback control loop
Implementation Method 2
the capillary column material is an electrically resistive material and a power supply is electrically coupled to the capillary column material and operable for temperature modulated resistive heating
Data Source
AI summary
The invention is a chromatography apparatus which comprises at least one capillary column, which has a coil assembly of column material and a small diameter wire coated with an electrically insulating high temperature material encased within a high temperature sheath. The small diameter wire is at least one electrically conductive element co-linear with the column material. Also provided is means for directly resistively heating the at least one capillary column, and means for controlling the temperature of the capillary column. Additionally, the apparatus includes an oxygen gas containing inlet, a hydrogen inlet, an analyte port and a flame region, oxygen delivery means for delivering oxygen through the oxygen inlet to the flame region, a hydrogen and analyte delivery system for delivering hydrogen and analyte to the flame region, and a detector arranged to detect flame emission.