An online near-infrared analysis preprocessing device and method

Abstract

An on-line near-infrared analysis pretreatment device and method belong to the technical field of ethylene cracking. Including sedimentation filter, filter dehydrator, oil-water heat exchanger and flow detection cell module components; sedimentation filter is connected to the filter and enters the secondary dehydration filter device; the dehydration filter has a shell and a sintered metal filter element; the oil-water heat exchanger has Convoluted coil; the flow detection cell module includes a constant temperature box and a flow cell part. The constant temperature module adopts a building block aluminum block structure, and an electric heating cable is embedded in the middle for heat tracing. The invention has the advantages of stable baseline and low noise; effectively removes air bubbles, impurities and moisture, and has good analysis result reproducibility; good sample recovery effect, reducing environmental pollution; low manufacturing cost, convenient and practical installation.

Description

Technical field [0001] The invention relates to an online near-infrared analysis pretreatment device and method, and belongs to the technical field of ethylene cracking. Background technique [0002] The characteristics of the online near-infrared analysis technology of ethylene cracking raw materials are: fast analysis speed, can provide accurate real-time analysis data within a few minutes; cost-effective, a near-infrared analyzer can measure several indicators at the same time; that is, offline analysis It can also be tested online. The state of the analytical instrument always changes within a certain range. This variation range depends on changes in external conditions (such as temperature), impurities that interfere with the analysis of the spectrum, and the analysis conditions of the instrument, which directly affect the reliability of the prediction results. [0003] Near-infrared analysis technology has strict requirements on temperature. In order to eliminate errors, the...

AI Technical Summary

Problems solved by technology

The near-infrared spectrum contains the vibration information of C-H, O-H, N-H and other chemical bonds, and water molecules also have a strong absorption band in the near-infrared spectrum region. During the detection process of the near-infrared spectrum, water becomes an impurity that interferes with the analysis of the spectrum region. , water must be removed during sample analysis to improve measurement accuracy; when measuring liquid samples, there will be air bubbles and impurities adsorbed on the wall of the detection cell, which will affect the absorption of light by the sample and cause deviations in results. These factors must be eliminated to improve measurement accuracy

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