Externally heated medium and high pressure process and apparatus for synthesizing material ammonia with methanol and methane

Abstract

The present invention is externally heated medium and high pressure process and apparatus for synthesizing material ammonia gas with methanol and methane. The apparatus includes medium pressure combined methanol synthesizing apparatus with serially and parallelly connected towers; high pressure methanolizing apparatus comprising oil separator, water cooler and high efficiency methanol separator; and externally heated high pressure methanating apparatus comprising methanating tower, heat exchanger outside the tower, steam heater, water cooler, ammonia cooler and gas-water separator. The apparatus has the advantages of high alcohol/ammonia ratio, complete refining of synthesized material ammonia gas, low CH4 in produced inert gas, low heat consumption, etc.

Description

(1) Technical field [0001] The invention belongs to a chemical production device related to a gas-solid phase catalytic reactor, and is mainly used for methanol synthesis and refining raw material gas for ammonia synthesis. (2) Background technology [0002] Medium-pressure co-alcohol is a technology commonly used in medium and small ammonia plants in my country. It co-produces part of methanol under the condition of mainly synthetic ammonia. load. [0003] Copper washing method can remove residual CO and CO in raw gas 2 , is a main method for refining raw material gas in my country's synthetic ammonia industry for a long time. Although this technology is very mature in my country's production, this method consumes a lot of metal copper due to high energy consumption, and it also pollutes the environment. , equipment investment is also large. With the large-scale production scale, this process is becoming more and more unsuitable for the situation. The methanation process ...

AI Technical Summary

Problems solved by technology

[0008] In order to overcome the disadvantages of the prior art that the ratio of alcohol and ammonia generated by methanation is low, the methanol production capacity is low, the raw material gas is not completely refined, the methane generated by methanation is relatively high, and the amount of air released from synthetic ammonia increases a lot, the present invention adopts the "external heating method" The new process of medium and high pressure methanol and methanation, that is, medium pressure co-alcohol with high alcohol-ammonia ratio - high-pressure methanolylation of alcohol gas after low-carbon oxides - high-pressure methanation process with low methane, and the shortcomings of the methanation process The heat is provided by steam (or electric) heating, increasing the ratio of alcohol to ammonia, making the methanol production capacity higher, and making the raw material gas refined thoroughly, the methane generated by methanation is lower, and the air volume of synthetic ammonia is increased the least.

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