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Process and device for purifying sulfuric acid phase in iodine and sulfur cycle under low pressure

A technology of sulfuric acid and iodine sulfur, which is applied in the direction of sulfur trioxide/sulfuric acid, iodine, inorganic chemistry, etc., can solve the problems of high equipment cost and complicated process, achieve the effects of low purification temperature, improve purification efficiency, and reduce purification and concentration costs

Active Publication Date: 2012-06-27
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] In order to solve the problem of purifying the sulfuric acid phase in the iodine-sulfur cycle, and overcome the disadvantages of high raw material and equipment costs and complex processes in the traditional normal-pressure nitrogen purging purification process, the present invention provides a method for purifying the sulfuric acid phase in the iodine-sulfur cycle under low pressure. Process and device

Method used

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  • Process and device for purifying sulfuric acid phase in iodine and sulfur cycle under low pressure
  • Process and device for purifying sulfuric acid phase in iodine and sulfur cycle under low pressure
  • Process and device for purifying sulfuric acid phase in iodine and sulfur cycle under low pressure

Examples

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Effect test

Embodiment 1

[0033] First, the purification and concentration tower (such as figure 1 Shown) heating up to 110°C, using a vacuum control pump to control the pressure P of the purification and concentration tower to 1atm (as a comparison), 0.9atm, 0.8atm, 0.7atm, 0.6atm, 0.5atm, 0.4atm, 0.3atm, 0.2 atm, 0.1atm, 0.05atm, 0.01atm, through the liquid flow control pump will be composed into H 2 SO 4 +0.1HI+4H 2 O (ie molar ratio H 2 SO 4 :HI:H 2 (0=1: 0.1: 4) sulfuric acid phase, input from the upper feed port of the purification and concentration tower, the liquid flow rate of the control sulfuric acid phase is 183g / h, and the sulfuric acid phase flows through the purification and concentration tower of temperature control temperature and low pressure, a small amount of in the sulfuric acid phase The reverse reaction of Benson's reaction between hydroiodic acid and partial sulfuric acid: H 2 SO 4 +2HI=SO 2 +I 2 +2H 2 O, the SO obtained from the purification reaction 2 , I 2 and H ...

Embodiment 2

[0036] First, the purification and concentration tower (such as figure 1 Shown) heating up to 60°C, using a vacuum control pump to control the pressure P of the purification and concentration tower to 0.1atm, 0.09atm, 0.08atm, 0.07atm, 0.06atm, 0.05atm, 0.04atm, 0.03atm, 0.02atm, 0.01 atm, by liquid flow control pump will be composed into H 2 SO 4 +0.1HI+4H 2 O (ie molar ratio H 2 SO 4 :HI:H 2 (0=1: 0.1: 4) sulfuric acid phase, input from the upper feed port of the purification and concentration tower, the liquid flow rate of the control sulfuric acid phase is 183g / h, and the sulfuric acid phase flows through the purification and concentration tower of temperature control temperature and low pressure, a small amount of in the sulfuric acid phase The reverse reaction of Benson's reaction between hydroiodic acid and partial sulfuric acid: H 2 SO 4 +2HI=SO 2 +I 2 +2H 2 O, the SO obtained from the purification reaction 2 , I 2 and H 2 O is extracted from the exhaust p...

Embodiment 3

[0039] First, the purification and concentration tower (such as figure 1 Shown) heating up to 60°C, 80°C, 100°C, 120°C, 140°C, 160°C, 180°C, 200°C respectively, using the vacuum control pump to control the pressure P of the purification and concentration tower to 0.06atm, and control the The pump will consist of H 2 SO 4 +0.1HI+4H 2 O (ie molar ratio H 2 SO 4 :HI:H 2 (0=1: 0.1: 4) sulfuric acid phase, input from the upper feed port of the purification and concentration tower, the liquid flow rate of the control sulfuric acid phase is 183g / h, and the sulfuric acid phase flows through the purification and concentration tower of temperature control temperature and low pressure, a small amount of in the sulfuric acid phase The reverse reaction of Benson's reaction between hydroiodic acid and partial sulfuric acid: H 2 SO 4 +2HI=SO 2 +I 2 +2H 2 O, the SO obtained from the purification reaction 2 , I 2 and H 2 O is extracted from the exhaust port at the upper end of the...

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Abstract

The invention relates to a process and a device for purifying a sulfuric acid phase in the iodine and sulfur cycle under low pressure and belongs to the technical field of hydrogen production of the iodine and sulfur thermochemical cycle. The process for purifying the sulfuric acid phase is carried out under the condition of lower than normal pressure, i.e. under the condition of a purification temperature between 50 and 200 DEG C, a pressure P of a purifying and concentrating tower is controlled in the range that P is more than or equal to 0.01atm and less than 1atm. Compared with the conventional sulfuric acid phase purification process which adopts a nitrogen purging mode under normal pressure, the process has the characteristics of low purification temperature, simple process and low cost and can realize purification and concentration of the sulfuric acid phase in one step so as to effectively improve the purifying efficiency and reduce the purifying and concentrating cost.

Description

technical field [0001] The invention relates to a process and a device for purifying the sulfuric acid phase in an iodine-sulfur cycle under low pressure, and belongs to the technical field related to thermochemical cycle hydrogen production. Background technique [0002] The energy system dominated by fossil fuels has made great contributions to the development of human society. However, the reserves of fossil fuels are limited and non-renewable, and their use will cause environmental pollution. Because hydrogen has the advantages of high calorific value, good combustion performance, renewable, clean and non-toxic, hydrogen energy is considered to be the future energy of mankind. Actively developing hydrogen energy is becoming the energy strategy of many countries. However, the traditional method of hydrogen production has some shortcomings that are difficult to overcome, such as: the use of fossil fuels to produce hydrogen contains CO 2 Emission problems, low efficiency...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/90C01B17/50C01B7/14
Inventor 王来军
Owner TSINGHUA UNIV
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