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Process for purifying sulfuric acid phase and hydriodic acid phase in iodine-sulfur cycle

A technology of hydroiodic acid and sulfuric acid, applied in the production of sulfur trioxide/sulfuric acid, hydrogen, iodine/hydrogen iodide, etc., can solve the problem of main acid consumption and achieve the effect of increased selectivity

Inactive Publication Date: 2011-06-15
TSINGHUA UNIV
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Problems solved by technology

[0013] In order to remove a small amount of hydriodic acid in the sulfuric acid phase and a small amount of sulfuric acid in the hydriodic acid phase, solve the purification problem of the sulfuric acid phase and hydriodic acid phase in the iodine-sulfur cycle, overcome the side reaction of pure nitrogen as a purge gas and purify the sulfuric acid phase Existing disadvantages such as main body acid consumption, the present invention provides a new process for purifying the sulfuric acid phase and hydroiodic acid phase in the iodine sulfur cycle

Method used

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  • Process for purifying sulfuric acid phase and hydriodic acid phase in iodine-sulfur cycle
  • Process for purifying sulfuric acid phase and hydriodic acid phase in iodine-sulfur cycle

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Effect test

Embodiment 1

[0042] First, the purification tower (such as figure 1 Shown) heating up to 90°C, 100°C, 110°C respectively, and the composition is converted into H through the liquid flow control pump 2 SO 4 +0.1HI+4H 2 O (ie molar ratio H 2 SO 4 :HI:H 2 (0=1: 0.1: 4) the sulfuric acid phase, imports from the feed inlet on the upper part of the purification tower, and the control sulfuric acid phase liquid flow rate is 183g / h, simultaneously will be mixed gas by nitrogen oxygen (molar ratio 0 2 :N 2 =1:20) the active purge gas that forms is passed into from the gas inlet of purification tower bottom, and purge gas flow rate is 11.8L / h, and the molar flow rate of oxygen in the active purge gas and the molar flow rate ratio of impurity acid HI this moment The ratio is 1:4, the sulfuric acid phase flows through the temperature-controlled purification tower under the purging of the active purge gas, a small amount of hydroiodic acid in the sulfuric acid phase and the oxygen in the active p...

Embodiment 2

[0044] First, the purification tower (such as figure 1 Shown) heated up to 200 ° C, through the liquid flow control pump to convert the composition into H 2 SO 4 +0.15HI+0.03I 2 +5H 2 O (ie molar ratio H 2 SO 4 :HI:I 2 :H 2 (0=1: 0.15: 0.03: 5) sulfuric acid phase, input from the upper feed port of the purification tower, the control sulfuric acid phase liquid flow velocity is 215g / h, simultaneously will be mixed gas by oxygen argon (molar ratio 0 2 : Ar=50: 1) the active purge gas that forms is passed into from the gas inlet of purification tower lower part, and purge gas flow rate is 6.9L / h, and the molar flow of oxygen in the active purge gas and the mole flow rate of impurity acid HI this moment The flow ratio is 2:1, the sulfuric acid phase flows through the temperature-controlled purification tower under the condition of purging the active purge gas, and is purified, and the purified liquid flows out from the liquid outlet at the lower end of the purification towe...

Embodiment 3

[0046] First, the purification tower (such as figure 1 Shown) heated to 80 ℃, through the liquid flow control pump to form H 2 SO 4 +0.05HI+4H 2 O (ie molar ratio H 2 SO 4 :HI:H 2 (0=1: 0.05: 4) sulfuric acid phase, input from the upper feed port of the purification tower, the control sulfuric acid phase liquid flow velocity is 177g / h, simultaneously will be by nitrogen oxygen mixed gas (mol ratio 0 2 :N 2 =1:50) the active purge gas that forms is passed into from the gas inlet of purification tower lower part, and purge gas flow velocity is 28.6L / h, and the molar flow rate of oxygen in the active purge gas and the molar flow rate ratio of impurity acid HI this moment The ratio is 1:2, the sulfuric acid phase flows through the temperature-controlled purification tower under the condition of purging the active purge gas, that is, it is purified, and the purified liquid flows out from the liquid outlet at the lower end of the purification tower. The gas after the purifica...

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Abstract

The invention relates to a process for purifying a sulfuric acid phase and a hydriodic acid phase in an iodine-sulfur cycle, which belongs to the technical field related to hydrogen production through an iodine-sulfur thermochemical cycle. The sulfuric acid phase and the hydriodic acid phase obtained through a Benson reaction in the iodine-sulfur cycle respectively contain a small amount of HI and a small amount of H2SO4, and a traditional purification process comprises the following steps of: using nitrogen gas as sweep gas, heating to promote the occurrence of the reverse reaction of the Benson reaction: 2HI+H2SO4=SO2+I2+2H2O, and removing impurity acid. The traditional purification process can consume main acid, and a side reaction often occurs together. In order to overcome the defect, the invention provides a two-phase purification process using the mixed gas of oxygen and inert gas as active sweep gas, and as for the purification of the sulfuric acid phase, the reaction principle is 4HI+O2=2I2+2H2O, sulfuric acid is not lost, and the reaction temperature is lower; and as for the purification of the hydriodic acid phase, the active sweep gas can inhabit the generation of S and H2S and promote the selectivity enhancement of converting H2SO4 into SO2.

Description

technical field [0001] The invention relates to a process for purifying a sulfuric acid phase and a hydroiodic acid phase in an iodine-sulfur cycle, and belongs to the related technical field of hydrogen production through an iodine-sulfur thermochemical cycle. Background technique [0002] Hydrogen energy is considered to be the most ideal secondary energy source, also known as the future energy source of mankind. However, due to the presence of CO in traditional hydrogen production methods and technologies 2 Disadvantages such as emissions and low efficiency restrict the development of hydrogen energy. Therefore, research on clean, efficient and sustainable hydrogen production methods has increasingly become the focus of attention. Among the many thermochemical cycle hydrogen production methods, the iodine-sulfur (IS) cycle proposed by the American GA company has been selected by many countries such as the United States, Japan, and France as the preferred process for fut...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/90C01B7/13C01B3/04
CPCY02E60/364Y02E60/36
Inventor 王来军久保真治笠原清司田中伸幸今井良行小贯薰
Owner TSINGHUA UNIV
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