Does anyone know anything about the problems that occur during hydrogenation?

Accident: After the hydrogen activation process in the high-pressure hydrogenation dew point reduction system of the hydrogenation unit was completed, the workshop arranged to integrate the dew point reduction unit into the system. Oil was introduced into the dew point reduction system at 11:38, and during a routine inspection around 12:00, it was observed that smoke and oil were escaping from the outlet flange of reactor heater F201; it was confirmed that this high-pressure flange was leaking. The workshop immediately reduced the pressure in the demulsification system and cooled it down slowly, applied steam to cover the leaking flange, and finally reduced the pressure in the demulsification system to 3.5 MPA. The leaking flange was then tightened again, and after tightening it was put back into use without any further leaks. Cause analysis: The reason for this flange leakage was that after hydrogen activation of the dew point reduction system, the pipeline at the furnace outlet was exposed to temperatures exceeding 500°C. When the temperature dropped back to the operating level of 250°C, the large temperature difference between these levels caused the flange bolts to loosen. Hydrogen leakage went unnoticed; it was not until oil was introduced into the system that the oil and gas leakage became apparent ； The excessive rapidity of temperature drop and inadequate inspection were the main causes of this accident

Hydrogen leaks and is highly flammable; the flame appears pale blue, making it difficult to detect during the day. Therefore, on-site inspections are extremely important.

The service life of the downstream valves in the hydrogenation reactor of terephthalic acid (PTA) plants is a problem, as erosion corrosion is severe

The main methods for producing hydrogen in China currently include: hydrogen production via the gasification of coal and coke, hydrogen production through the reformation of natural gas or petroleum products, hydrogen production by water electrolysis, and hydrogen production via methanol reformation. The choice of raw material for hydrogen production is closely related to the scale of hydrogen production. Generally, large-scale hydrogen production facilities use petroleum products, natural gas, or coal as raw materials for hydrogen production. For small and medium-scale hydrogen production, water electrolysis, methanol reforming, and small-scale natural gas reforming are commonly employed in China. Among the aforementioned hydrogen production technologies, water electrolysis and methanol reformation are both mature technologies in China; the investment requirements and hydrogen production costs for these three processes vary significantly. Due to the technology of producing hydrogen by electrolyzing water, its production process is simple, the equipment is standardized, and the production scale is small; it is completely different from the principles and processes involved in producing hydrogen through the reformation of coal, methanol, and natural gas.