Methanol Purification Version – One Question per Day 20200710
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For short-term parking, why does the copper-based catalyst need to be replaced after depressurization? Answer: 1) During short-term parking, after the synthesis system is depressurized, small amounts of gases such as carbon monoxide, methanol, and hydrogen remain in the system. During maintenance, it leaks into the atmosphere, posing health risks to production operators and maintenance personnel; therefore, the system must be purged with nitrogen after depressurization in the synthesis system. 2) Carbon monoxide in the gas causes carbonyl corrosion to the equipment, with the corrosion rate being highest at 150°C–250°C, resulting in the formation of pentacarbonyl iron. 3) After depressurizing the synthesis system, this is done to prevent oxygen in the air from entering the system and oxidizing the catalyst. 4) Some experts believe that when the temperature of the catalyst bed drops below 210°C, the rate at which by-products other than methanol are formed from the feed gas increases, hence nitrogen purging is necessary.
1) During short-term parking, after the synthesis system is depressurized, small amounts of gases such as carbon monoxide, methanol, and hydrogen remain in the system. During maintenance, it leaks into the atmosphere, posing health risks to production operators and maintenance staff; therefore, the system must be purged with nitrogen after depressurization in the synthesis system. 2) Carbon monoxide in the gas causes carbonyl corrosion of the equipment; the corrosion rate is highest at temperatures between 150°C and 250°C, resulting in the formation of pentacarbonyl iron. 3) After depressurizing the synthesis system, this is done to prevent oxygen in the air from entering the system and oxidizing the catalyst. 4) Some experts believe that when the temperature of the catalyst bed drops below 210, the rate at which by-products other than methanol are formed from the feed gas increases, hence nitrogen purging is necessary.
1) During short-term parking, after the synthesis system is depressurized, small amounts of gases such as carbon monoxide, methanol, and hydrogen remain in the system. During maintenance, it leaks into the atmosphere, posing health risks to production operators and maintenance staff; therefore, the system must be purged with nitrogen after depressurization in the synthesis system. 2) Carbon monoxide in the gas causes carbonyl corrosion of the equipment; the corrosion rate is highest at temperatures between 150°C and 250°C, resulting in the formation of pentacarbonyl iron. ?? 3) After depressurizing the synthesis system, this is done to prevent oxygen in the air from entering the system and oxidizing the catalyst. 4) Some experts believe that when the temperature of the catalyst bed drops below 210, the rate at which by-products other than methanol are formed from the feed gas increases, hence nitrogen purging is necessary.
1) During short-term parking, after the synthesis system is depressurized, small amounts of gases such as carbon monoxide, methanol, and hydrogen remain in the system. During maintenance, it leaks into the atmosphere, posing health risks to production operators and maintenance staff; therefore, the system must be purged with nitrogen after depressurization in the synthesis system. 2) Carbon monoxide in the gas causes carbonyl corrosion of the equipment; the corrosion rate is highest at temperatures between 150°C and 250°C, resulting in the formation of pentacarbonyl iron. 3) After depressurizing the synthesis system, this is done to prevent oxygen in the air from entering the system and oxidizing the catalyst. 4) Some experts believe that when the temperature of the catalyst bed drops below 210, the rate at which by-products other than methanol are formed from the feed gas increases, hence nitrogen purging is necessary.
1) During short-term parking, after the synthesis system is depressurized, small amounts of gases such as carbon monoxide, methanol, and hydrogen remain in the system. During maintenance, it leaks into the atmosphere, posing health risks to production operators and maintenance staff; therefore, the system must be purged with nitrogen after depressurization in the synthesis system. 2) Carbon monoxide in the gas causes carbonyl corrosion of the equipment; the corrosion rate is highest at temperatures between 150°C and 250°C, resulting in the formation of pentacarbonyl iron. 3) After depressurizing the synthesis system, this is done to prevent oxygen in the air from entering the system and oxidizing the catalyst. 4) Some experts believe that when the temperature of the catalyst bed drops below 210, the rate at which by-products other than methanol are formed from the feed gas increases, hence nitrogen purging is necessary.
1) During short-term parking, after the synthesis system is depressurized, small amounts of gases such as carbon monoxide, methanol, and hydrogen remain in the system. During maintenance, it leaks into the atmosphere, posing health risks to production operators and maintenance staff; therefore, the system must be purged with nitrogen after depressurization in the synthesis system. 2) Carbon monoxide in the gas causes carbonyl corrosion of the equipment; the corrosion rate is highest at temperatures between 150°C and 250°C, resulting in the formation of pentacarbonyl iron. 3) After depressurizing the synthesis system, this is done to prevent oxygen in the air from entering the system and oxidizing the catalyst. 4) Some experts believe that when the temperature of the catalyst bed drops below 210, the rate at which by-products other than methanol are formed from the feed gas increases, hence nitrogen purging is necessary.
1) During short-term parking, after the synthesis system is depressurized, small amounts of gases such as carbon monoxide, methanol, and hydrogen remain in the system. During maintenance, it leaks into the atmosphere, posing health risks to production operators and maintenance staff; therefore, the system must be purged with nitrogen after depressurization in the synthesis system. 2) Carbon monoxide in the gas causes carbonyl corrosion of the equipment; the corrosion rate is highest at temperatures between 150°C and 250°C, resulting in the formation of pentacarbonyl iron. 3) After depressurizing the synthesis system, this is done to prevent oxygen in the air from entering the system and oxidizing the catalyst. 4) Some experts believe that when the temperature of the catalyst bed drops below 210, the rate at which by-products other than methanol are formed from the feed gas increases, hence nitrogen purging is necessary.
1) During short-term parking, after the synthesis tower is depressurized, a small amount of CO and methanol remains in the system. When maintaining the equipment, this CO and methanol can enter the air, posing a risk to the health of the maintenance personnel; therefore, N2 is used to displace these gases after the synthesis tower is depressurized； 2) CO in the gas causes carbonyl corrosion to the equipment pipes. After the pressure in the synthesis tower is released, the temperature gradually drops. When the temperature falls to 150–200°C, the CO remaining in the system accelerates the corrosion of the equipment and pipelines; therefore, it is necessary to purge the system with N2 ； 3) To prevent air from entering the system and oxidizing the catalyst after pressure release during parking, the system should be maintained at a slight positive pressure using N2, in order to ensure the safety of the catalyst.
1) During short-term parking, after the synthesis system is depressurized, small amounts of gases such as carbon monoxide, methanol, and hydrogen remain in the system. During maintenance, it leaks into the atmosphere, posing health risks to production operators and maintenance staff; therefore, the system must be purged with nitrogen after depressurization in the synthesis system. 2) Carbon monoxide in the gas causes carbonyl corrosion of the equipment; the corrosion rate is highest at temperatures between 150°C and 250°C, resulting in the formation of pentacarbonyl iron. 3) After depressurizing the synthesis system, this is done to prevent oxygen in the air from entering the system and oxidizing the catalyst. 4) Some experts believe that when the temperature of the catalyst bed drops below 210, the rate at which by-products other than methanol are formed from the feed gas increases, hence nitrogen purging is necessary.
1) During short-term parking, after the synthesis system is depressurized, small amounts of gases such as carbon monoxide, methanol, and hydrogen remain in the system. During maintenance, it leaks into the atmosphere, posing health risks to production operators and maintenance staff; therefore, the system must be purged with nitrogen after depressurization in the synthesis system. 2) Carbon monoxide in the gas causes carbonyl corrosion of the equipment; the corrosion rate is highest at temperatures between 150°C and 250°C, resulting in the formation of pentacarbonyl iron. 3) After depressurizing the synthesis system, this is done to prevent oxygen in the air from entering the system and oxidizing the catalyst. 4) Some experts believe that when the temperature of the catalyst bed drops below 210, the rate at which by-products other than methanol are formed from the feed gas increases; therefore, nitrogen purging is necessary
1) During short-term parking, after the synthesis system is depressurized, small amounts of gases such as carbon monoxide, methanol, and hydrogen remain in the system. During maintenance, it leaks into the atmosphere, posing health risks to production operators and maintenance staff; therefore, the system must be purged with nitrogen after depressurization in the synthesis system. 2) Carbon monoxide in the gas causes carbonyl corrosion of the equipment; the corrosion rate is highest at temperatures between 150°C and 250°C, resulting in the formation of pentacarbonyl iron. 3) After depressurizing the synthesis system, this is done to prevent oxygen in the air from entering the system and oxidizing the catalyst. 4) Some experts believe that when the temperature of the catalyst bed drops below 210, the rate at which by-products other than methanol are formed from the feed gas increases, hence nitrogen purging is necessary.