Method for purifying reagent isopropanol for spectral analysis

By employing a purification method with closed-loop control throughout the entire process, combining acid-base neutralization, molecular sieve adsorption, modified activated carbon adsorption, and γ-alumina adsorption with segmented heating and total reflux distillation, the problem of high purity and low energy consumption of isopropanol for spectral analysis has been solved, achieving the production of high purity, low energy consumption, and high recovery rate.

CN122325293APending Publication Date: 2026-07-03FTSCI HUBEI BIOTECH CO LTD +3
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Patent Information

Application Number
CN202610418553.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-31
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Existing technologies are insufficient to meet the high purity requirements of isopropanol for spectroscopic analysis, and suffer from problems such as incomplete removal of fluorescent precursors, high energy consumption, low recovery rate, and lack of online closed-loop control.

Method used

A purification method with closed-loop control throughout the entire process is adopted. By combining acid-base neutralization, molecular sieve adsorption, modified activated carbon adsorption, and γ-alumina adsorption with segmented temperature rise and total reflux distillation, the process sequence and parameters are optimized. Combined with online sensing and closed-loop regulation, continuous production with high purity, low energy consumption and high recovery rate is achieved.

Benefits of technology

It achieves high purity (≥99.997wt%), low moisture (≤0.018wt%) and low fluorescent precursor concentration (≤0.9µg·) of isopropanol, reduces unit energy consumption by more than 25%, increases recovery rate by 5-10 percentage points, and improves product quality stability.

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Abstract

The invention discloses a method for purifying a reagent isopropanol for spectral analysis. The method comprises the following steps: S1, mixing industrial-grade isopropanol with an alkali metal compound, adjusting the pH value to 7.0-8.0, and carrying out solid-liquid separation to obtain a neutralized filtrate; s2, the neutralized filtrate sequentially passes through a molecular sieve adsorption unit, a modified activated carbon adsorption unit and a gamma-aluminum oxide adsorption unit for continuous adsorption and impurity removal; s3, the adsorbed liquid is subjected to segmented heating total reflux rectification, the reflux ratio is controlled to be (5-15): 1, the total reflux time is 1-3 hours, and a top segment product is collected; and S4, filling and sealing the top section product under the protection of inert gas. On-line conductivity and moisture sensors, infrared detection devices and on-line concentration sensors are arranged at key nodes, so that the whole-process closed-loop regulation and control is realized. The method has the advantages of high purity, low energy consumption, high recovery rate and controllable process, and is suitable for industrial production of high-purity isopropanol for spectral analysis.
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