Issues regarding the safety and environmental protection of hydrogenation units
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Due to work requirements, I would like to raise several issues regarding safety and environmental protection in the chemical industry, particularly in the field of hydrogenation. Everyone, help me think of a few more. It’s okay if there are no answers; let’s discuss it first. On-site, theory is fine. Great thanks:handshake:handshake
In hydrogenation, the most important aspect of safety is heat control.
The reaction temperature and pressure in hydrogenation are interlinked, as are the reduction and oxidation processes of the catalyst, as well as the pressure drop across the catalyst bed
I’ll write a few too, as a reference. First, the hydrogenation process is a process under strict supervision, and there are issues related to design automation. Second, the issue of the explosion-proof rating of electrical equipment in areas where hydrogen is used. Third, the issues related to the installation of hydrogen pipelines and the setup of hydrogen exhaust pipes. Fourth, the reaction operation displacement problem. Requirements for oxygen content in nitrogen. Fifth, the issue of preventing hydrogen corrosion under high temperature and pressure in equipment pipes. Sixth, the placement of combustible gas detectors. Seventh, lightning and static electricity protection for pipelines and equipment
1. The hydrogenation reactor should preferably be placed in a separate small room, and it is advisable to have an explosion venting wall in this room； 2. During the hydrogenation process, if Pd or rhodium is to be used, attention must be paid to the risk of ignition during the material feeding process ； 3. During the hydrogenation process, if Pd is used, the hydrogen absorption reaction releases a significant amount of heat. If your reaction temperature is 80°C, then you cannot raise the temperature of the system to 80°C before introducing hydrogen; instead, you need to raise the temperature to 30°C and then introduce hydrogen, so that the temperature of the system will gradually rise to 80°C℃ ； 4. There must be safety valves and explosion-proof plates, and the pressure relief pipes must lead to an unoccupied area. It is best to build a tank to collect the liquid that is discharged. Additionally, under acidic conditions, Pd reacts with oxygen in the air and dissolves in water. The Pd/C that comes out must be collected quickly, and it is necessary to arrange things in advance with the recycling manufacturer ； 5. Before starting the reaction, purge the air in the reactor with nitrogen 3 times first ； Replace the nitrogen in the tank with hydrogen 3 more times. After the reaction is complete, the hydrogen in the reactor is also replaced with nitrogen three times first, followed by pressure filtration. That’s all I can think of for now.