Method for producing methanol, coproduct hydrogen and byproduct steam by utilizing hydrocarbonaceous tail gas

Abstract

The invention discloses a method for producing methanol, coproduct hydrogen and byproduct steam by utilizing hydrocarbonaceous tail gas. The invention is characterized in that the method includes the following steps: A, hydrocarbonaceous tail gas is subject to self hydrogenation under the action of catalyst, unsaturated hydrocarbon is converted into saturated hydrocarbon, and meanwhile sulfocompound generates sulphur compound which can be easily removed under the action of catalyst; and heat generated in the reaction is utilized to produce steam; B, sulphur compound removal is carried out on the products obtained by the step A; C, the products obtained by the step B react with the steam to prepare hydrogen, carbon monoxide and carbon dioxide under the action of catalyst; D, the products obtained by the step C are used for preparing methane under the action of catalyst; E, methane and hydrogen are respectively collected. The invention has the beneficial effects that: resource is reasonably utilized, energy conservation and emission reduction and environmental protection can be realized; carbon element is converted into methane, emission of carbon dioxide is reduced, a desulphurization device is adopted to remove organic sulphur and inorganic sulphur in tail gas, sulphur compound emission is reduced, and the method is beneficial to environmental protection. Waste is fully utilized and recycled, and industry chain is improved.

Description

technical field [0001] The invention relates to a method for producing methanol by utilizing hydrocarbon-containing tail gas to co-produce hydrogen by-product steam. Background technique [0002] At present, the dry gas of refineries and the hydrocarbon-containing tail gas produced by deep-processing enterprises that use liquefied petroleum gas as raw materials have the following two methods of treatment in the production process: 1. It is directly used as fuel for boiler combustion, and steam is generated by using heat energy. However, the exhaust gas after combustion includes a large amount of carbon dioxide, water vapor, and sulfur dioxide gas, which are discharged into the atmosphere through the chimney and pollute the environment. This process not only increases the emission of pollutants in the atmosphere, but also wastes some raw materials. [0003] 2. Extract hydrogen after conversion. Although some raw materials are utilized, some raw material components are still ...

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Problems solved by technology

Although some raw materials are used, some raw materials are still wasted, and a large amount of carbon dioxide is emitted

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