Methanol section: One question per day. What is the reason for the increase in pressure in the synthesis tower? 2016.04.01
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Methanol section: One question per day. What is the reason for the increase in pressure in the synthesis tower? 2016.04.01 What is the reason for the increase in pressure in the synthesis tower? Answer: In synthesis reactions, regardless of the process used, there is a pressure equilibrium point. During normal operation, this pressure equilibrium point remains relatively stable. If an increase in the pressure inside the synthesis tower is observed, possible reasons include: 1) an imbalance in the hydrogen-to-carbon ratio, which can be corrected by adjusting the amount of hydrogen added to keep the ratio within the normal range. 2) An increase in the content of inert gases such as CH4 and N2 in the recycle gas leads to a decrease in the partial pressures of CO, CO2, and H2, thereby affecting the synthesis reaction. 3) As the catalyst reaction temperature drops, the synthesis reaction deteriorates. 4) The increased pressure at the outlet of the recycle gas compressor leads to high pressure at the inlet of the synthesis tower. 5) The cooling and separation of crude methanol in the syngas are inadequate. 6) High pressure in the gasification system can also cause high pressure at the inlet of the synthesis tower
When synthesizing methanol, regardless of the production process used, there is a equilibrium point for the reaction pressure. During normal operation, this pressure equilibrium remains relatively stable. The reasons for an increase in pressure include: (1) A drop in reaction temperature, which leads to a deterioration of the synthesis reaction, or even its worsening. And fresh gas is continuously supplied, causing the system pressure to rise, even to excessive levels. (2) An increase in methane content in the recycle gas affects the methanol synthesis reaction, and it is also a cause of rising inlet pressure. (3) The cooling effect is poor when the syngas passes through the circulating water cooler, preventing the generated methanol from being separated. (4) Increasing the fresh gas flow rate without notifying the synthesis unit in a timely manner. (5) Catalyst activity decreases, resulting in a low conversion rate.
In synthesis, which takes place under reverse conditions, there is always a pressure equilibrium point; during normal production this equilibrium point remains relatively stable. If an increase in the pressure within the reactor is observed, possible reasons include: 1) an imbalance in the hydrocarbon ratio, which can be corrected by adjusting the amount of hydrogen added, thereby keeping the hydrocarbon ratio within the normal range. 2) An increase in the content of inert gases such as HC4N2 in the cycle leads to a decrease in the partial pressures of CO and HC2O2, thereby affecting the synthesis reaction. 3) The catalyst reaction temperature drops, resulting in a deterioration of the synthesis reaction. 4) The increase in the outlet pressure of the recycle gas compressor leads to a high inlet pressure in the synthesis tower. 5) The separation efficiency of crude methanol and cooling components in the syngas is poor. 6) High pressure in the gasification system can also cause high pressure in the synthesis inlet tower
Answer: In synthetic reactions, regardless of the process used, there is a pressure equilibrium point. During normal operation, this pressure equilibrium point remains relatively stable. If an increase in the pressure inside the synthesis tower is observed, possible reasons include: 1) an imbalance in the hydrogen-to-carbon ratio, which can be corrected by adjusting the amount of hydrogen added to keep the ratio within the normal range. 2) An increase in the content of inert gases such as CH4 and N2 in the recycle gas leads to a decrease in the partial pressures of CO, CO2, and H2, thereby affecting the synthesis reaction. 3) As the catalyst reaction temperature drops, the synthesis reaction deteriorates. 4) The increased pressure at the outlet of the recycle gas compressor leads to high pressure at the inlet of the synthesis tower. 5) The cooling and separation of crude methanol in the syngas are inadequate. 6) High pressure in the gasification system can also cause high pressure at the inlet of the synthesis tower
(1) As the reaction temperature drops, the synthesis reaction deteriorates, or even worsens. (2) An increase in the methane content in the recycled gas affects the methanol synthesis reaction. (3) The cooling effect is poor when the syngas passes through the recirculating water cooler, preventing the generated methanol from being separated. (4) Increasing the fresh gas flow rate without notifying the synthesis unit in a timely manner. (5) Catalyst activity decreases, and the conversion rate is low. (6) The vent volume is too low ； It will also lead to an increase in pressure
The system load is too high, causing the pressure gauge to show distorted readings and an imbalance in the H/C ratio
(1) As the reaction temperature drops, the synthesis reaction deteriorates, or even worsens. And fresh gas is continuously supplied, causing the system pressure to rise, even to excessive levels. (2) An increase in methane content in the recycle gas affects the methanol synthesis reaction, and it is also a cause of the rise in inlet pressure. (3) The cooling effect is poor when the syngas passes through the circulating water cooler, preventing the generated methanol from being separated. (4) Increasing the fresh gas flow rate without notifying the synthesis unit in a timely manner. (5) Catalyst activity declines, resulting in a low conversion rate.
During synthesis in reverse mode, there is a pressure equilibrium point that must be maintained; this equilibrium point remains more stable during normal production. If an increase in tower pressure is observed, possible reasons include: 1) an imbalance in the hydrocarbon ratio, which can be corrected by adjusting the amount of hydrogen added to keep the hydrocarbon ratio within the normal range； 2) An increase in the concentration of inert gases such as HC4N2 in the cycle leads to a decrease in the partial pressures of CO and HC2O2, thereby affecting the synthesis reaction ； 3) The catalyst reaction temperature drops, resulting in a deterioration of the synthesis reaction ； 4) The increase in the outlet pressure of the recycle gas compressor leads to a high inlet pressure in the synthesis tower ； 5) The separation efficiency of crude methanol and cooling components in syngas is poor ； 6) High pressure in the gasification system can also cause high pressure in the synthesis inlet tower.
1. Change in gas composition, 2. Increase in compressor outlet pressure, 3. Increase in the amount of fresh gas, 4. Decreased reaction conversion rate due to catalyst aging, 5. Low efficiency of the methanol separator, resulting in methanol being carried in the gas entering the tower, 6. Decrease in the amount of off-gas
High load, severe wax formation leading to poor separation efficiency; poor water cooling also results in poor separation. High gas density and large pressure differences occur, and a high content of inert components hinders the reaction process. The catalyst’s performance deteriorates over time, leading to poor reactions. An imbalance in the hydrogen-to-carbon ratio increases pressure, and the circulating gas contains liquid droplets; low inlet temperature further contributes to poor reactions and high pressure.