Methods and apparatus for controlling the intermittent refining process of crude phenol and for online automatic detection

By combining an online automatic sampling circulation system and a central control system, the problem of sampling pipeline blockage in crude phenol refining production was solved, realizing real-time detection and closed-loop automatic control of all components and indicators, thereby improving product quality and production efficiency.

CN122084778APending Publication Date: 2026-05-26CCTEG CHINA COAL RES INST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CCTEG CHINA COAL RES INST
Filing Date
2025-12-31
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

In the current crude phenol refining process, the high vacuum negative pressure environment and the easy crystallization characteristics of the material cause frequent blockages in the sampling pipeline, making it impossible to achieve continuous and stable sampling. This results in delayed analytical data and seriously restricts the level of process automation control and product quality improvement.

Method used

An online automatic sampling and circulation system was constructed, which uses an explosion-proof metering pump and a heated pipeline to form a forced circulation loop. Combined with a central control system, it realizes continuous extraction and pressurization of liquid samples. Real-time detection of components and physicochemical properties is carried out through dual-flow gas chromatography and machine vision technology, and closed-loop control is achieved by combining a distributed control system.

Benefits of technology

It enables online real-time detection and closed-loop automatic control of all components and indicators in the crude phenol refining process, improving product quality stability and production efficiency, and reducing the safety risks and energy consumption of manual operation.

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Abstract

This invention relates to the field of crude phenol refining technology, and discloses a method and apparatus for intermittent refining process control and online automatic detection of crude phenol. It utilizes an online automatic sampling circulation system, which overcomes the vacuum negative pressure condition of the production system through an explosion-proof metering pump, pressurizing, filtering, and isothermal heating the sample to establish a forced circulation loop to prevent crystallization and blockage by high-viscosity materials. Using an online automatic detection circulation system, and equipped with a dual-flow gas chromatography and automated experimental module, it synchronously detects component concentration, trace moisture, pigment color difference, and antioxidant properties in real time. After data verification by the central control system, the distributed control system automatically adjusts the reflux ratio, outflow rate, and heating power of the distillation column based on cascade feedback, dynamic dead zone, and variable decoupling strategies. This invention solves the problem of difficulty in synchronously detecting multiple indicators online, realizes closed-loop control of the entire crude phenol refining process, and significantly improves product quality stability.
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