Process for combined preparing methylic alcohol, natural gas for automobile and synthesis ammonia form industrial end gas rich in carbon and hydrogen

Abstract

The invention discloses a method for coproducing methanol, natural gas for vehicles, and synthetic ammonia by using the hydrocarbon-rich industrial tail gas. The method is characterized in that the purified mixed raw material gas, namely a mixture of coke oven gas and carbide furnace gas, passes through a methanol synthesizer, a methanator, a pressure swing absorption and separation device and an ammonia synthesis reactor in sequence, to firstly separate the methanol; the separated methane can be used as the natural gas for vehicles; ammonia synthesis can be performed to the separated hydrogen gas and nitrogen; and pure hydrogen can be obtained by the excess hydrogen gas through pressure swing absorption after the ammonia synthesis is performed. Compared with prior art, the method has the advantages that the CH4 conversion is avoided, the CO transformation is avoided, and the air separation device is not provided. Therefore, the complexity of process is reduced, the useful component of the gas and the useful energy source can be comprehensively utilized in a cascade way, the raw material gas, the energy consumption, and the discharge amount of the carbon dioxide are all reduced, and the method develops a new way for the comprehensive utilization of the hydrocarbon-rich industrial tail gas of coke oven gas, carbide furnace gas, etc.

Description

technical field [0001] The invention relates to a method for producing methanol, natural gas for vehicles and synthetic ammonia by using industrial tail gas rich in carbon and hydrogen, in particular to a method for co-producing methanol and synthetic ammonia without transformation using industrial tail gas rich in carbon and hydrogen such as coke oven gas and calcium carbide furnace gas as raw materials. Natural gas and methods for synthesizing ammonia. Background technique [0002] The main raw materials for synthesizing methanol and ammonia are natural gas and coal. Raw material gas made from natural gas and coal must undergo technological processes such as transformation and separation to obtain qualified synthesis gas or hydrogen. The process is long and natural resources are not fully utilized. At present, there are more and more industrial waste gases containing hydrogen and carbon monoxide, such as coke oven gas, calcium carbide furnace gas, and yellow phosphorus f...

AI Technical Summary

Problems solved by technology

At present, most of the calcium carbide production enterprises in my country do not recycle the calcium carbide furnace gas, but directly burn and discharge it in the form of a torch, which wastes a lot of energy and causes serious pollution to the environment.

Only a small number of enterprises have recycled it, and it is only used in the production of steam or lime kiln as fuel, with low utilization rate and poor comprehensive benefits

In the chemical industry, the purification of carbon monoxide is carried out first, and the purified carbon monoxide is mainly used to produce high-purity metals (nickel, tungsten, platinum, etc.), sponge iron, polycrystalline diamond film and some special steels, which are used as steelmaking blast furnaces Reducing agent for medium iron, etc., with low added value