Comparison of hydrogen production from methanol and hydrogen production from ammonia decomposition
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Methanol decomposition hydrogen production equipment is a method that uses methanol and water to decompose and convert methanol on a catalyst to produce hydrogen.； The ammonia decomposition device uses liquid ammonia as raw material. After gasification, it is heated and decomposed under the action of a catalyst to produce a mixed gas containing 75% hydrogen and 25% nitrogen. The question is, what are the differences between the applicable occasions of hydrogen production from methanol and hydrogen production from ammonia decomposition? How does the technology and economy compare? Wait, discussion is welcome. Thanks!
Now there are those who synthesize ammonia and methanol, and there are also those who decompose methanol to produce hydrogen and decompose ammonia to produce hydrogen? ? ? ? Ammonia and methanol are both synthesized using hydrogen, but now we are working backwards, which is a bit funny.
Both technologies are used for small-scale hydrogen production. The raw material cost and energy consumption are relatively high. The detailed technical and economic indicators have not been compared, but it seems that methanol decomposition is used more for hydrogen production.
What is said on the second floor is somewhat different. In large-scale hydrogen production, coal or oil are used to produce hydrogen. However, when hydrogen is needed on a small scale, but the amount of hydrogen cylinders is not economical, it is true that methanol decomposition and ammonia decomposition are used to produce hydrogen. There are many domestic manufacturers that can provide such technology or devices. Please go to the search network to search and you will know.
It is not surprising that there are industries for synthesizing ammonia and methanol, and there are also industrial plants for producing hydrogen by decomposing methanol and decomposing ammonia.: Ammonia and methanol are basic chemical raw materials, and there are devices for synthesizing ammonia and methanol. This is easy to understand. Due to the problems of hydrogen storage and transportation, some units or enterprises that require hydrogen sources (small and medium-sized) need hydrogen production devices to supply gas on site. For small and medium-sized hydrogen production units, methanol cracking hydrogen production technology has the economic advantage of small initial investment.
The research institute where I used to work has a series of technologies and complete sets of equipment and catalysts for producing hydrogen from methanol, which have been used by many manufacturers. They are mainly used for small amounts and high purity hydrogen sources, such as the hydrogenation of edible oils. If you need the specific technology, you can reply to email because it is confidential.
Ammonia decomposition is mainly used in small-scale hydrogen production occasions, and it is best to have no special requirements for nitrogen! Methanol cracking is mainly used in medium-sized hydrogen production occasions with high purity!
Methanol cracking to produce hydrogen is relatively safer and can be considered when the gas volume is not very large. For example, when the methanol plant was originally started, there was no hydrogen available for this equipment. There is one danger in decomposing ammonia to produce hydrogen, and the other is that the pressure requirements must be stricter.
Of course, it is convenient to produce hydrogen from methanol. The reason is very simple.: Methanol can be stored at room temperature and pressure, but ammonia cannot and must be liquefied under pressure. ； Small businesses that want to produce hydrogen do not have hydrogen sources. Cylinder hydrogen is troublesome and costly. Since buying hydrogen is troublesome, I don’t think it will be easy to buy liquid ammonia.
Liquid ammonia hydrogen production has relatively high equipment requirements. Compared with methanol hydrogen production, it has more applications. The investment in a 200m3/h methanol hydrogen production device is about 1.5 million, and the cost of hydrogen is about 2.6 yuan.
Hydrogen production from liquid ammonia contains N2, which is difficult to separate and the power cost is too high.
Both methods are used in small and medium-sized hydrogen devices where coal and natural gas raw materials are inconvenient. Ammonia decomposition contains nitrogen. It is generally used in places with high carbon content requirements, and the cost is relatively high.
The ammonia cracking hydrogen production equipment is made of special materials, and the initial investment is larger than that of methanol cracking. The subsequent purification device uses temperature swing adsorption.