Key points of anti-crystallization design for pipeline transportation of bisphenol A?

Key points of anti-crystallization design for pipeline transportation of bisphenol A

Bisphenol A(Bisphenol A, referred to as BPA) is an important chemical raw material, widely used in plastics, epoxy resins and coatings industries. Because of its viscosity and easy crystallization characteristics in the process of production and transportation, the crystallization problem of bisphenol A in pipeline transportation is easy to occur, which leads to pipeline blockage, affects the transportation efficiency and even causes safety accidents. Therefore, anti-crystallization is a key issue in the pipeline design of bisphenol A. This paper will analyze the key points of anti-crystallization design of pipeline transportation of bisphenol A in detail, and provide reference for related enterprises.

1. Pipe temperature control

the crystallization temperature range of bisphenol A is about 100-120°C, so maintaining an appropriate temperature during pipeline transportation is the key to preventing crystallization. The design should ensure that the temperature in the pipe is always higher than the crystallization temperature of bisphenol A. Generally, temperature control can be achieved by the following measures:

• heat tracing system: Install heat tracing cable or heat tracing cable on the outside of the pipeline to provide continuous heat and prevent the internal temperature of the pipeline from falling.
• Insulation layer: Set up an insulation layer outside the pipeline to reduce heat loss and keep the internal temperature of the pipeline stable.
• Temperature monitoring and regulation: Install temperature sensors in key positions, monitor the pipeline temperature in real time, and adjust the power of the heat tracing system as needed.

2. Optimization of conveying medium flow rate

the transport flow rate of bisphenol A has a great influence on the crystallization. If the flow rate is too low, it will cause the material to stay in the pipeline and easily form crystallization; while if the flow rate is too high, it may cause wear and tear on the pipeline and increase the maintenance cost. Therefore, it is necessary to consider the relationship between the flow rate and the pipe diameter and select the appropriate flow rate range.

• Flow rate range: Generally speaking, the delivery flow rate of bisphenol A should be controlled between 1-3 m/s. The specific flow rate should be calculated according to the viscosity, density and conveying distance of the material.
• Pipeline slope design: In the pipeline design, the slope can be set appropriately to make the material flow under the action of gravity and avoid material stagnation in the horizontal pipeline.
• Valve and pipe fitting design: Select valves and pipe fittings suitable for bisphenol A transportation to ensure smooth material flow and avoid uneven flow due to improper valve or pipe fitting design.

3. Material selection and surface treatment

pipe material selection and surface treatment are also critical to prevent bisphenol A crystallization. The corrosion resistance and surface finish of different materials will affect the flow and crystallization of the material.

• Material selection: recommend materials such as stainless steel, polypropylene (PP) or polytetrafluoroethylene (PTFE) are used, which have good corrosion resistance and chemical stability, and are not easy to react with bisphenol A.
• Surface treatment: The inner wall of the pipeline should be polished or coated to reduce surface roughness and reduce the possibility of material adhesion, thereby reducing the formation of crystallization.

4. On-line cleaning and crystallization detection

in order to find and deal with crystallization problems in time, the pipeline transportation system should be equipped with online cleaning and crystallization detection equipment.

• online cleaning system: Install a cleaning device at the key position of the pipeline to clean the pipeline regularly to prevent the accumulation of crystals.
• Crystallization detection: Using infrared detection, ultrasonic detection or pressure monitoring technology, real-time monitoring of the crystallization of the inner wall of the pipeline, timely alarm and take treatment measures.

5. Delivery pressure control

excessive conveying pressure may cause bisphenol A to form high-pressure crystals on the inner wall of the pipeline, while too low pressure will cause insufficient fluidity of the material. Therefore, reasonable control of conveying pressure is also an important part of anti-crystallization.

• Pressure regulation: According to the length, diameter and terrain of the pipeline, choose the appropriate conveying pressure to avoid too high or too low pressure.
• Safety valve and pressure release device: Install safety valves and pressure release devices in the piping system to prevent crystallization problems caused by abnormal pressure.

6. Pipeline design layout

the design layout of the pipeline also has an important influence on the crystallization during transportation.

• Pipe Slope: Reasonably design the slope of the pipeline to enable the material to flow smoothly and avoid stagnation.
• Valve and elbow arrangement: Minimize the number of valves and elbows, reduce the resistance of material flow, and avoid crystallization caused by excessive resistance.
• Pipe diameter selection: The diameter of the pipe should be reasonably selected according to the flow rate and flow rate of the material to avoid the accumulation of materials due to the small diameter.

Conclusion

the anti-crystallization design of pipeline transportation of bisphenol A needs to consider temperature control, flow rate optimization, material selection, online cleaning and crystallization detection. Through scientific design and reasonable construction, it can effectively prevent the crystallization of bisphenol A in the pipeline and ensure the safety and efficiency of the transportation process. When designing and maintaining the bisphenol A delivery system, enterprises should fully consider these anti-crystallization design points, and formulate specific plans based on the actual situation to improve the reliability and economy of the system.