The method of obtaining hydrogen-enriched gas

 

The invention relates to the production of hydrogen-containing gases from hydrocarbons, more particularly to a method for producing a hydrogen-enriched gas from the simple dimethyl ether. The method of obtaining hydrogen-enriched gas includes contacting a simple dimethyl ether with steam in the presence of the solid catalyst and the solid acid in the reactor. The process is carried out in a fixed bed consisting of a mixture of the solid catalyst and the solid acid at a weight ratio, respectively, equal to 1:55:1, the solid catalyst used metal-containing catalyst, and the process is carried out at a temperature of 225-450oC and a pressure of 1-100 bar. The invention improves the yield of the desired product with high selectivity for the formation of hydrogen and oxides of carbon. 3 C.p. f-crystals, 2 tab.

The invention relates to the production of hydrogen-rich gas from hydrocarbon raw materials, more particularly to a method for producing a hydrogen-enriched gas from the simple dimethyl ether.

A method of obtaining hydrogen-enriched gas by contacting a simple dimethyl ether with steam in the presence of solid rolled hydration and decomposition of the formed methanol (see patent GB 2805314, 01 J 23/78, 28.04.1982).

Flowing in a known way reactions are illustrated by the following scheme:N.1=5.28 kcal/molBoth reactions can be carried out both in gas and liquid phase.

The objective of the invention is to develop a method of producing hydrogen-enriched gas, which due to the high speed of the reaction is highly efficient.

The problem is solved in a method of producing hydrogen-enriched gas by contacting a simple dimethyl ether with steam in the presence of the solid catalyst and the solid acid in the reactor due to the fact that the process is carried out in a fixed bed consisting of a mixture of the solid catalyst and the solid acid at a weight ratio, respectively, equal to 1:55:1, the solid catalyst used metal-containing catalyst, and the process is carried out at a temperature of 225 - 450oC and a pressure of 1-100 bar.

It was found that the overall reaction is simple dimethyl ether (DME) to hydrogen-enriched gas according to the following reaction:

As a metal-containing catalyst used is preferably copper and zinc on aluminum oxide.

As the solid acid can be applied to any solid acid. The preferred catalyst is chosen from the group comprising zeolites, in particular zeolites brand ZSM-5 in an aqueous form and/or Siral-5, silicates of alumina, oxide of silicon and aluminum, and mixtures thereof.

The process is preferably carried out at a temperature 225-240oC and a pressure of 2-50 bar.

Before contacting with the source of gaseous feedstock, the catalyst is transferred into the active form. For example, the active form of the solid acid is a hydrogen form, obtained by ion exchange in the contacting of the catalyst with a solution of a proton donor. Metal-containing catalyst is usually activated by contact with a regenerating gas.

The catalysts are usually used in the form of extrudates, beads, granules, etc., solid forms suitable for the formation of the fixed layer.Aulnay ratio of 1:11:10, preferably 1:21:5, served in recator fixed bed. Consisting of simple dimethyl ether and steam gas is passed through a bed of the catalyst at a pressure of 1:100 bar and a flow rate 1000-5000 h-1.

At the reaction temperature over 225oWith, preferably 250oWith the simple conversion of dimethyl ether to hydrogen and oxides of carbon is mostly complete in the specified conditions.

The following examples further illustrate the present invention.

Example 1 In a tubular reactor placed a fixed layer composed of 3.00 g of a mixture of catalysts, which represents the product of MDK-20 company Haldor Topsoe a/s, DK (copper-zinc-aluminum catalyst) and the trading product Siral-5 company Condea, DE (silica and alumina), taken in a weight ratio of 1:1. A mixture of both catalysts consists of granules of a size of 0.1 to 1.0 mm

Consisting of simple dimethyl ether and water in a molar ratio of 0.25: 1, the gas is fed into the reactor in the amount of 1.6 g simple dimethyl ether/hour and at a pressure of 1.2 bar. The process is carried out isometrically at temperatures shown in table 1, which also summarizes the results of this example.

Example 2

The results of this example are also summarized in table 2.


Claims

1. The method of obtaining hydrogen-enriched gas by contacting a simple dimethyl ether with steam in the presence of the solid catalyst and the solid acid in the reactor, wherein the process is carried out in a fixed bed consisting of a mixture of the solid catalyst and the solid acid at a weight ratio, respectively, equal to 1: 55:1, the solid catalyst used metal-containing catalyst, and the process is carried out at a temperature of 225-450oC and a pressure of 1-100 bar.

2. The method according to p. 1, wherein the solid acid is chosen from the group comprising zeolites, silicates, alumina, oxide of silicon and aluminum, and mixtures thereof.

3. The method according to p. 1, characterized in that the solid cycle carried out at a temperature 225-240oC and a pressure of 2-50 bar.

 

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