Methanol Purification Version – Daily Question 20200604
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What are the disadvantages of excessively high and low gas temperatures after water cooling of syngas? Answer: If the temperature of the gas after water cooling of syngas is controlled too high, it will affect the condensation of methanol and water vapor in the gas. As the water cooling temperature of the syngas increases, the amount of methanol that remains uncondensed in the gas rises; this methanol not only increases the energy consumption of the circulation compressor but also hinders the synthesis of methanol into its desired products within the methanol synthesis tower. However, the water cooling temperature of the syngas does not need to be controlled too low either. As the water cooling temperature decreases, the condensation effect of methanol increases accordingly, but when the temperature drops below 20°C, the increase in methanol’s condensation effect becomes less significant. Therefore, pursuing excessively low water cooling temperatures is uneconomical; it not only requires more sophisticated equipment but also increases the consumption of cooling water. During normal operation, the water temperature of the cooled syngas is controlled at 20-40°C.
Too low: Increased energy consumption for circulating water. Too high: Difficulties in methanol separation, liquid carried in the recycled gas, liquid slugging in the compressor, which can damage the compressor; it may even enter the synthesis tower, causing a drop in the temperature of the catalyst bed and thereby worsening the synthesis reaction and reducing catalyst activity
This post was last edited by wjl7212 on 2020-6-8 at 17:09. Answer: If the temperature of the gas after water cooling of the syngas is too high, it will affect the condensation of methanol and water vapor in the gas. As the temperature used for water cooling of the syngas increases, the amount of methanol that remains uncondensed in the gas rises; this methanol not only increases the energy consumption of the compression units but also hinders the synthesis of methanol into its desired products within the methanol synthesis tower. However, the water cooling temperature of the syngas does not need to be controlled too low either; as the water cooling temperature decreases, the condensation effect of methanol increases accordingly. When the temperature drops below 20°C, the increase in methanol’s condensation effect becomes less significant. Therefore, pursuing excessively low water cooling temperatures is uneconomical; it not only requires more sophisticated equipment but also increases the consumption of cooling water. Therefore, during normal operation, the water temperature of the cooled syngas is controlled at 20-40°C.
If the temperature of the gas after water cooling of the syngas is controlled too high, it will affect the condensation of methanol and water vapor in the gas. As the temperature used for water cooling of the syngas increases, the amount of methanol that remains uncondensed in the gas rises; this methanol not only increases the energy consumption of the recycle compressor but also hinders the synthesis of methanol into its desired products within the methanol synthesis tower. However, the water cooling temperature of the syngas does not need to be controlled too low either; as the water cooling temperature decreases, the condensation effect of methanol increases accordingly. When the temperature drops below 20°C, the increase in methanol’s condensation effect becomes less significant. Therefore, pursuing excessively low water cooling temperatures is not economical; it not only requires more sophisticated equipment but also increases the consumption of cooling water. As a result, in normal operation, the temperature of the cooled syngas is kept between 20-40°C.
If the temperature of the gas after water cooling of the syngas is controlled too high, it will affect the condensation of methanol and water vapor in the gas. As the temperature used for water cooling of the syngas increases, the amount of methanol that remains uncondensed in the gas rises; this methanol not only increases the energy consumption of the recycle compressor but also hinders the synthesis of methanol into its desired products within the methanol synthesis tower. However, the water cooling temperature of the syngas does not need to be controlled too low either; as the water cooling temperature decreases, the condensation effect of methanol increases accordingly. When the temperature drops below 20°C, the increase in methanol’s condensation effect becomes less significant. Therefore, pursuing excessively low water cooling temperatures is uneconomical; it not only requires more sophisticated equipment but also increases the consumption of cooling water. Therefore, during normal operation, the water temperature of the cooled syngas is controlled at 20-40°C.
If the temperature of the gas after water cooling of the syngas is controlled too high, it will affect the condensation of methanol and water vapor in the gas. As the temperature used for water cooling of the syngas increases, the amount of methanol that remains uncondensed in the gas rises; this methanol not only increases the energy consumption of the recycle compressor but also hinders the synthesis of methanol into its desired products within the methanol synthesis tower. However, the water cooling temperature of the syngas does not need to be controlled too low either; as the water cooling temperature decreases, the condensation effect of methanol increases accordingly. When the temperature drops below 20°C, the increase in methanol’s condensation effect becomes less significant. Therefore, pursuing excessively low water cooling temperatures is not economical; it not only requires more sophisticated equipment but also increases the consumption of cooling water. As a result, in normal operation, the temperature of the cooled syngas is kept between 20-40°C.
If the temperature of the gas after water cooling of the syngas is controlled too high, it will affect the condensation of methanol and water vapor in the gas. As the temperature used for water cooling of the syngas increases, the amount of methanol that remains uncondensed in the gas rises; this methanol not only increases the energy consumption of the recycle compressor but also hinders the synthesis of methanol into its desired products within the methanol synthesis tower. However, the water cooling temperature of the syngas does not need to be controlled too low either; as the water cooling temperature decreases, the condensation effect of methanol increases accordingly. When the temperature drops below 20°C, the increase in methanol’s condensation effect becomes less significant. Therefore, pursuing excessively low water cooling temperatures is not economical; it not only requires more sophisticated equipment but also increases the consumption of cooling water. As a result, in normal operation, the temperature of the cooled syngas is kept between 20-40°C.
If the temperature of the gas after water cooling of the syngas is controlled too high, it will affect the condensation of methanol and water vapor in the gas. As the temperature used for water cooling of the syngas increases, the amount of methanol that remains uncondensed in the gas rises; this methanol not only increases the energy consumption of the recycle compressor but also hinders the synthesis of methanol into its desired products within the methanol synthesis tower. However, the water cooling temperature of the syngas does not need to be controlled too low either; as the water cooling temperature decreases, the condensation effect of methanol increases accordingly. When the temperature drops below 20°C, the increase in methanol’s condensation effect becomes less significant. Therefore, pursuing excessively low water cooling temperatures is not economical; it not only requires more sophisticated equipment but also increases the consumption of cooling water. As a result, in normal operation, the temperature of the cooled syngas is kept between 20-40°C.
If the temperature of the gas after water cooling of the syngas is controlled too high, it will affect the condensation of methanol and water vapor in the gas. As the temperature used for water cooling of the syngas increases, the amount of methanol that remains uncondensed in the gas rises; this methanol not only increases the energy consumption of the recycle compressor but also hinders the synthesis of methanol into its desired products within the methanol synthesis tower. However, the water cooling temperature of the syngas does not need to be controlled too low either; as the water cooling temperature decreases, the condensation effect of methanol increases accordingly. When the temperature drops below 20°C, the increase in methanol’s condensation effect becomes less significant. Therefore, pursuing excessively low water cooling temperatures is uneconomical; it not only requires more sophisticated equipment but also increases the consumption of cooling water. Therefore, during normal operation, the water temperature of the cooled syngas is controlled at 20-40°C.
Too low: Increased energy consumption for circulating water. Too high: Difficulties in methanol separation, liquid carried in the recycled gas, liquid slugging in the compressor, which can damage the compressor; it may even enter the synthesis tower, causing a drop in the temperature of the catalyst bed and thereby worsening the synthesis reaction and reducing catalyst activity
If the temperature of the gas after water cooling of the syngas is controlled too high, it will affect the condensation of methanol and water vapor in the gas. As the temperature used for water cooling of the syngas increases, the amount of methanol that remains uncondensed in the gas rises; this methanol not only increases the energy consumption of the recycle compressor but also hinders the synthesis of methanol into its desired products within the methanol synthesis tower. However, the water cooling temperature of the syngas does not need to be controlled too low either; as the water cooling temperature decreases, the condensation effect of methanol increases accordingly. When the temperature drops below 20°C, the increase in methanol’s condensation effect becomes less significant. Therefore, pursuing excessively low water cooling temperatures is not economical; it not only requires more sophisticated equipment but also increases the consumption of cooling water. As a result, in normal operation, the temperature of the cooled syngas is kept between 20-40°C.