【Q&A Question No. 085】2018.03.26
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【Q&A Question 085】March 26, 2018: How does the purity of hydrogen affect the hydrogen consumption in hydrogenation reactions? The hydrogen consumption varies depending on the different feed oils and processing methods used. The higher the purity of the recycled hydrogen, the lower the hydrogen consumption. Due to the low purity of the recycled hydrogen, it must contain a significant amount of light components such as methane and ethane. These components cannot dissolve in the oil produced; instead, a large portion of them remains in the recycled gas, which reduces the purity of the hydrogen and affects the quality of the product. To maintain the purity of the recycled hydrogen, it is necessary to release some of it and simultaneously introduce fresh hydrogen. In production, the higher the purity of the recycled hydrogen, the better, as this can increase the degree of reaction of the oil. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) Due to the limitations on the number of posts in the “One Question per Day” section, “One Image per Day” has been moved to the registered devices section; you can access it through the directory I posted. For management purposes, if you need to access content from a few days ago, please go to the summary post below to enter the “My Registration Season” event – (Note: This event is currently ongoing in the Chemical Engineering section). https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=18978 For the daily questions section related to chemical engineering technology training in 2018: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1888971 For the daily image section related to registration equipment in 2018: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1888970 For the Q&A section related to hydrogen production and hydrogenation technologies in 2018: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1888968 For the daily questions section related to LNG technology in 2018: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1888973 For the Q&A section from 2017 (updates have started): https://bbs.hcbbs.com/thread-1657793-1-1.html For the daily questions section from 2017 (updates have started): https://bbs.hcbbs.com/thread-1657794-1-1.html For the daily image section from 2017: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1875160 For the list of daily questions related to LNG in 2017: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1804162 For the Q&A section from 2016 (all updates completed): https://bbs.hcbbs.com/thread-1597792-1-1.html
Low hydrogen purity results in high hydrogen consumption. It’s overstated; measuring instruments generally do not take purity into account, and the lower the purity, the greater the disadvantage. Low purity, low hydrogen partial pressure, high total pressure. With constant chemical hydrogen consumption, dissolved hydrogen, leaked hydrogen, and evolved hydrogen increase, leading to an increase in total hydrogen consumption.
The hydrogen consumption varies depending on the different crude oils and processing processes. The higher the purity of the recycled hydrogen, the lower the hydrogen consumption. Due to the low purity of the recycled hydrogen, it must contain a significant amount of light components such as methane and ethane. These components cannot dissolve in the oil produced; instead, a large portion of them remains in the recycled gas, which reduces the purity of the hydrogen and affects the quality of the product. To maintain the purity of the recycled hydrogen, it is necessary to release some of it and simultaneously introduce fresh hydrogen. In production, the higher the purity of the recycled hydrogen, the better, as this can increase the degree of reaction of the oil.
The hydrogen consumption varies depending on the different crude oils and processing processes. The higher the purity of the recycled hydrogen, the lower the hydrogen consumption. Due to the low purity of the recycled hydrogen, it must contain a significant amount of light components such as methane and ethane. These components cannot dissolve in the oil produced; instead, a large portion of them remains in the recycled gas, which reduces the purity of the hydrogen and affects the quality of the product. To maintain the purity of the recycled hydrogen, it is necessary to release some of it and simultaneously introduce fresh hydrogen. In production, the higher the purity of the recycled hydrogen, the better, as this can increase the degree of reaction of the oil.
The hydrogen consumption varies depending on the different crude oils and the oil processing processes. A higher level of recycled hydrogen results in less hydrogen consumption. Since the purity of recycled hydrogen is low, it contains significant amounts of components such as methane and ethane; these components cannot dissolve in the oil products formed, and instead remain in the recycled hydrogen, thereby reducing its purity and affecting the quality of the products. To maintain the purity of recycled hydrogen, it is necessary to release some of it and simultaneously introduce fresh hydrogen. In production, the higher the purity of recycled hydrogen, the better, as it allows for a greater degree of reaction in the formation of oil products.
The hydrogen consumption varies depending on the different crude oils and the oil processing processes. A higher level of recycled hydrogen results in less hydrogen consumption. Since the purity of recycled hydrogen is low, it contains significant amounts of components such as methane and ethane; these components cannot dissolve in the oil products formed, and instead remain in the recycled hydrogen, thereby reducing its purity and affecting the quality of the products. To maintain the purity of recycled hydrogen, it is necessary to release some of it and simultaneously introduce fresh hydrogen. In production, the higher the purity of recycled hydrogen, the better, as it allows for a greater degree of reaction in the formation of oil products.
The higher the hydrogen purity, the more it helps to increase the depth of the hydrogenation reaction; the more complete the reaction, the greater the hydrogen consumption
The hydrogen consumption varies depending on the different crude oils and the oil processing processes. A higher purity of the recycled hydrogen results in lower hydrogen consumption. When the purity of recycled hydrogen is low, it contains more light components such as methane and ethane; these components cannot dissolve in the oil products formed, and instead remain in the recycled hydrogen, reducing its purity and affecting the quality of the products. To maintain the purity of the recycled hydrogen, it is necessary to release some of it and simultaneously introduce some new hydrogen. In production, the higher the purity of the recycled hydrogen, the better; it can increase the reaction depth of the oil products within a certain range.
There might be a slight increase, but the additional hydrogen consumption is merely to raise the hydrogen partial pressure in order to ease the severity of the reaction; it actually does not change the amount of hydrogen required for the reaction. The hydrogen consumption in the reaction should be considered from two aspects: one is the quality of the feed oil, as the amount of impurities and olefins is the main factor affecting hydrogen consumption in the reaction ； Second is the requirement regarding product quality; higher quality standards lead to greater sensitivity, resulting in increased hydrogen consumption.
The hydrogen consumption varies depending on the different crude oils and processing methods. The higher the purity of the recycled hydrogen, the lower the hydrogen consumption. Due to the low purity of the recycled hydrogen, it must contain a significant amount of light components such as methane and ethane. These components cannot dissolve in the oil produced, so a large portion of them remains in the recycled gas, which reduces the purity of the hydrogen and affects the quality of the product. To maintain the purity of the recycled hydrogen, it is necessary to release some of it and simultaneously introduce fresh hydrogen. In production, the higher the purity of the recycled hydrogen, the better, as this can increase the degree of reaction of the oil.