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 and can solve problems such as rectification of hydriodic acid that is difficult to contain iodine

Active Publication Date: 2015-06-17
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above phenomena and problems make it difficult for conventional rectification methods to be directly applied to the rectification of iodine-containing hydroiodic acid

Method used

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  • Method for rectifying iodine-containing hydriodic acid feed liquid

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Embodiment 1

[0024] like figure 1 As shown, in this embodiment, the inner diameter of the packed tower 1 is 5cm, the inner packing is a glass spring packing of Ф3mm*20mm, the height of the packing layer is 1.25m, and the feeding port of the feed liquid containing iodohydroiodic acid is 1m away from the top of the tower ; The rectifying kettle 2 has a volume of 2L and is equipped with a heating jacket with a power of 1kW. The mol ratio of each component in the iodine hydroiodic acid feed liquid to be rectified is: HI:H 2 O:I 2 =1:7.10:1.50.

[0025] Before the rectification treatment of the above-mentioned iodine-containing hydroiodic acid feed liquid, first add iodine-free hydroiodic acid in the rectifying still 2, the molar ratio of each component in the hydroiodic acid is HI:H 2 O=1:5.0. Implement start-up operation on the rectification equipment, start the heating device of the rectification kettle and the condensation reflux device 3 at the top of the tower, and operate in the tota...

Embodiment 2

[0028] like figure 1 As shown, in this embodiment, the inner diameter of the packed tower 1 is 10cm, the inner packing is glass spring packing of Ф3mm*30mm, the height of the packing layer is 2.0m, and the feeding port of the feed liquid containing iodohydroiodic acid is 1.5m away from the top of the tower ; The rectifying kettle 2 has a volume of 3.5L and is equipped with a heating jacket with a power of 3kW. The mol ratio of each component in the iodine hydroiodic acid feed liquid to be rectified is: HI:H 2 O:I 2 =1:10.00:1.10.

[0029]Before the rectification treatment of the above-mentioned iodine-containing hydroiodic acid feed liquid, first add iodine-free hydroiodic acid in the rectifying still 2, the mol ratio of each component in the hydroiodic acid is HI H 2 O=1:6.0. Implement start-up operation on the rectification equipment, start the heating device of the rectification kettle and the condensation reflux device 3 at the top of the tower, and operate in the tota...

Embodiment 3

[0033] like figure 1 As shown, in this embodiment, the inner diameter of the packed tower 1 is 15cm, the inner packing is glass spring packing of Ф3mm*30mm, the height of the packing layer is 2.0m, and the feeding port of the feed liquid containing iodohydroiodic acid is 1.0m from the top of the tower ; The rectifying kettle 2 has a volume of 16L and is equipped with a heating jacket with a power of 6kW. The mol ratio of each component in the iodine hydroiodic acid feed liquid to be rectified is: HI:H 2 O:I 2 =1:4.23:1.70.

[0034] Before the rectification treatment of the above-mentioned iodine-containing hydroiodic acid feed liquid, first add hydroiodic acid containing a small amount of iodine in the rectifying still 2, the mol ratio of each component of hydroiodic acid is HI:H 2 O:I 2 =1:4.80:0.40. Implement start-up operation on the rectification equipment, start the heating device of the rectification kettle and the condensation reflux device 3 at the top of the towe...

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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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Patent Type & Authority Patents(China)
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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