Discussion on cryogenic ethylene solutions

The cryogenic method for ethylene typically uses low-temperature liquefied gases or refrigeration units. Here is a possible cryogenic approach for ethylene: 1. Use a refrigeration unit: Such units can utilize liquid nitrogen (-196°C) or liquid hydrogen (-253°C) for cooling. First, ethylene is heat-exchanged with a refrigerant through heat transfer equipment to reduce its temperature to near that of the refrigerant. Then, through further heat exchange, the temperature of ethylene is further reduced to the target temperature of -100°C. 2. Use of cryogenic liquefied gases: Commonly used cryogenic liquefied gases include liquid nitrogen and liquid argon (-196°C), which can directly exchange heat with ethylene to achieve cooling. First, ethylene is heat-exchanged with a cryogenic liquefied gas through heat transfer equipment to reduce its temperature to the target value of -100°C. In the above two approaches, the following aspects of process design need to be taken into account: 1. Design appropriate heat transfer equipment to ensure effective heat exchange between ethylene and the refrigerant or cryogenic liquefied gas. Devices such as heat exchangers or evaporators can be considered for use. 2. Design an appropriate cooling system, including a refrigeration unit or a cryogenic liquefied gas supply system. Factors such as energy consumption, process safety, and reliability need to be considered. 3. Consider pre-treating ethylene, such as by removing impurities and moisture, to avoid adverse effects on the equipment and heat transfer efficiency. 4. Design an appropriate control system to monitor and regulate the temperature and pressure of ethylene, ensuring the stability and safety of the process. Detailed design and optimization are required based on specific process requirements, equipment selection, and actual operating conditions. .

Coolant: Select a suitable coolant appropriate for the desired temperature range, such as liquid nitrogen, liquid argon, etc. The boiling point of liquid nitrogen is approximately -196°C, and that of liquid argon is also around -196°C; both are suitable for cooling ethylene at around -100°C. Cooling equipment: includes heat exchangers, condensers, etc. Heat exchangers are used to transfer heat, transferring the heat from ethylene to the coolant, which is heated in this process ； The condenser is used to convert the evaporated coolant back into a liquid state for reuse. Cooling cycle: The coolant is circulated into the cooling device to exchange heat with ethylene. The coolant absorbs the heat from ethylene, gets heated to a gaseous state, and then is cooled in a condenser to return to a liquid state, ready for reuse.