Method for rectifying iodine-containing hydriodic acid feed liquid

A technology of hydriodic acid and feed liquid, which is applied in the field of chemical engineering, can solve problems such as rectification of hydriodic acid that is difficult to contain iodine, and achieve the effect of preventing the failure of rectification operation.

Active Publication Date: 2013-07-24
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above phenomena and problems make it difficult for conventional rectification

Method used

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  • Method for rectifying iodine-containing hydriodic acid feed liquid

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0023] Example 1

[0024] Such as figure 1 As shown, in this embodiment, the inner diameter of the packed tower 1 is 5cm, the inner packing is Ф3mm*20mm glass spring packing, the height of the packing layer is 1.25m, and the feed port of the iodohydroiodic acid feed liquid is 1m away from the top of the tower ; The volume of the distillation still 2 is 2L, equipped with a heating jacket with a power of 1kW. The molar ratio of each component in the feed liquid containing iodohydroiodic acid to be rectified is:

[0025] HI:H 2 O:I 2 =1:7.10:1.50.

[0026] Before rectifying the above-mentioned iodine-containing hydroiodic acid feed liquid, firstly add iodine-free hydroiodic acid into the rectifying kettle 2, and the molar ratio of the components in the hydroiodic acid is HI: H 2 O=1:5.0. Carry out the start-up operation of the rectification equipment, start the heating device of the rectification kettle and the reflux device 3 at the top of the tower, and operate in the total reflux ...

Example Embodiment

[0030] Example 2

[0031] Such as figure 1 As shown, in this embodiment, the inner diameter of the packed tower 1 is 10cm, the inner packing is a glass spring packing of Ф3mm*30mm, the height of the packing layer is 2.0m, and the feed port of the iodohydroiodic acid feed liquid is 1.5m from the top of the tower ; The rectification kettle 2 has a volume of 3.5L and is equipped with a heating jacket with a power of 3kW. The molar ratio of each component in the feed liquid containing iodohydroiodic acid to be rectified is:

[0032] HI:H 2 O:I 2 =1:10.00:1.10.

[0033] Before rectifying the above-mentioned iodine-containing hydroiodic acid feed liquid, firstly add iodine-free hydroiodic acid into the rectifying tank 2, and the molar ratio of each component in the hydroiodic acid is HI H 2 O=1:6.0. Carry out the start-up operation of the rectification equipment, start the heating device of the rectification kettle and the reflux device 3 at the top of the tower, and operate in the tota...

Example Embodiment

[0038] Example 3

[0039] Such as figure 1 As shown, in this embodiment, the inner diameter of the packed tower 1 is 15cm, the inner packing is a glass spring packing of Ф3mm*30mm, the height of the packing layer is 2.0m, and the feed port of the iodohydroiodic acid feed liquid is 1.0m from the top of the tower ; The rectification kettle 2 has a volume of 16L and is equipped with a heating jacket with a power of 6kW. The molar ratio of each component in the feed liquid containing iodohydroiodic acid to be rectified is:

[0040] HI:H 2 O:I 2 =1:4.23:1.70.

[0041] Before rectifying the above-mentioned iodine-containing hydroiodic acid feed liquid, firstly add hydroiodic acid containing a small amount of iodine to the rectification tank 2, and the molar ratio of the components of the hydroiodic acid is HI:H 2 O:I 2 =1:4.80:0.40. Carry out the start-up operation of the rectification equipment, start the heating device of the rectification kettle and the reflux device 3 at the top of ...

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Abstract

The invention provides a method for rectifying an iodine-containing hydriodic acid feed liquid. The method which is adopted for rectifying the iodine-containing hydriodic acid feed liquid comprises steps of: firstly, adding hydriodic acid with high concentration or iodine-containing hydriodic acid with low iodine content and high HI content into a rectifying still, then starting a heating device of the rectifying still and a condensation reflux device on a still top, and operating in a total reflux mode; and when the condensation reflux device on the still top can stably reflux the hydriodic acid, feeding the iodine-containing hydriodic acid feed liquid to be rectified into the rectifying still, and continuously feeding from the still top and a still bottom. When the rectifying method is adopted to rectifying the iodine-containing hydriodic acid feed liquid, I2 in the feed liquid can be effectively prevented from being condensed on a rectifying column top to cause rectifying operation failure.

Description

technical field [0001] The invention relates to the technical field of chemical engineering, in particular to a kind of iodine-containing hydroiodic acid feed solution (i.e. hydrogen iodide-iodine-water ternary solution, HI-I 2 -H 2 O) the rectification method. Background technique [0002] Iodohydriodic acid feed solution (i.e. hydrogen iodide-iodine-water ternary solution, HI-I 2 -H 2 (2) The rectifying operation can be used in the thermochemical iodine-sulfur cycle decomposition water hydrogen production process and the electrochemical production process of hydroiodic acid. Taking the former as an example, in the hydrogen production process of the iodine-sulfur cycle, the hydroiodic acid generated by the Bunsen reaction forms HI-I due to the addition of excess iodine. 2 -H 2 The O phase needs to be rectified to obtain the HI needed for hydrogen production. [0003] Thanks to HI-I 2 -H 2 Iodine (I 2 ) is extremely volatile, and produces iodine vapor when heated to...

Claims

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Application Information

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IPC IPC(8): B01D3/14
Inventor 陈崧哲王兆龙张平王来军徐景明
Owner TSINGHUA UNIV
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