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Method for producing hydrogen gas by using acetic acid tail gas

A tail gas and acetic acid technology, applied to chemical instruments and methods, hydrogen, hydrogen separation, etc., can solve the problems of environmental pollution, waste of energy, increase the production cost of acetic acid, etc., and achieve good benefits, large hydrogen production, and resource saving effects

Inactive Publication Date: 2012-07-04
EAST CHINA UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Acetic acid tail gas contains a large amount of CO, which is the basic raw material for the production of acetic acid. A large amount of CO is vented, which not only wastes energy, increases the production cost of acetic acid, but also pollutes the environment.

Method used

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  • Method for producing hydrogen gas by using acetic acid tail gas
  • Method for producing hydrogen gas by using acetic acid tail gas
  • Method for producing hydrogen gas by using acetic acid tail gas

Examples

Experimental program
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Embodiment 1

[0028] In this example, the first and second batches of acetic acid tail gas were subjected to impurity removal, medium-temperature shift, low-temperature shift, and hydrogen purification to obtain high-purity hydrogen.

[0029] The 1st batch ingredient content is CO: 69.34%, CO 2 : 9.58%, H 2 : 15.32%, N 2 : 2.7%, CH 4 : 3.06% and trace amounts of methyl iodide and acetic acid tail gas of methanol are first washed to remove methanol, and then adsorbed by activated carbon to remove methyl iodide. The ECD detector is used to detect that the content of methyl iodide is less than 50ppm. After removing impurities, the gas enters the shift reactor for medium temperature The shift reaction, the shift catalyst adopts the B113-2 medium temperature shift catalyst produced by Liaohe Catalyst Factory, the inlet temperature of the middle shift is 280°C, the steam-to-gas ratio is 1.0, the reaction pressure is 1.2MP, and the CO dry content of the middle shift outlet is 4.89% as detected b...

Embodiment 2

[0034] In this example, the 3rd and 4th batches of acetic acid tail gas underwent impurity removal, pressure swing adsorption separation of CO, medium temperature shift, low temperature shift and hydrogen purification to obtain high-purity hydrogen.

[0035] The 3rd batch composition content is CO: 70.82%, CO 2 : 9.45%, H 2 : 14.20%, N 2 : 2.59%, CH 4 : 2.94% acetic acid tail gas with trace amounts of methyl iodide and methanol is washed with water to remove methanol, and then adsorbed by activated carbon to remove methyl iodide. The ECD detector is used to detect that the content of methyl iodide is less than 50ppm, and the gas after impurity removal enters the PSA-CO system. The raw material is fed through the inlet port, and CO is obtained at the outlet port, and the desorption gas of the pressure swing adsorption is passed into the shift reactor to carry out the medium temperature shift reaction. ℃, steam-gas ratio 1.1, reaction pressure 1.2MP, gas chromatographic detec...

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Abstract

The invention discloses a method for producing hydrogen gas by using acetic acid tail gas. The high-purity hydrogen gas is obtained by pretreatment, water vapor transformation reaction and hydrogen gas purification, with the acetic acid tail gas as a raw material. The pretreatment means that impurities such as methyl iodide, methyl alcohol and the like in the acetic acid tail gas are removed, or further the impurities such as methyl iodide, the methyl alcohol and the like are removed and then CO in the impurities is adsorbed by pressure varying adsorption; and the tail gas obtained by recovering the CO is used for a transformation reaction. The method disclosed by the invention has the advantages of facilitation for saving resources and protecting environment, low investment, high hydrogen capacity and low cost.

Description

technical field [0001] The invention relates to utilization of acetic acid tail gas and production of hydrogen, in particular to a method for producing hydrogen by utilizing acetic acid tail gas. Background technique [0002] Carbonylation of CO and methanol to produce acetic acid is currently the most important acetic acid production technology. In the process of producing acetic acid, a large amount of acetic acid tail gas is also produced. Due to the limitation of separation and recovery technology, most of them are vented at present. Acetic acid tail gas contains a large amount of CO, which is the basic raw material for acetic acid production, and a large amount of CO is vented, which not only wastes energy, increases the production cost of acetic acid, but also pollutes the environment. A few manufacturers use pressure swing adsorption or membrane separation to separate and purify the CO in the tail gas, which saves the basic raw materials for the production of acetic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/00C01B3/12C01B3/50
CPCY02E60/325Y02E60/32
Inventor 唐黎华曾义红黄敏叶小鹤吴勇强李彩云朱子彬
Owner EAST CHINA UNIV OF SCI & TECH
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