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Crude iodine purifying process

A process, the technology of iodine vapor, applied in the field of purification of crude iodine, to achieve the effects of recycling and protecting the environment

Inactive Publication Date: 2013-10-09
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] After searching, there is currently no patent application for purifying iodine by adding chemical substances to remove impurities, using compressed air as a blowing agent and gasifying agent for iodine vapor

Method used

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  • Crude iodine purifying process

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Embodiment

[0020] A crude iodine purification process, comprising the steps of:

[0021] (1) Add crude iodine into the ceramic reaction kettle, and add soda ash with a mass percentage of 2 to 5%;

[0022] (2) Start the heating device to heat the reactor, and control the temperature of the reactor at 120-180°C;

[0023] (3) Insert the air pipe into the reaction kettle, and turn on the compressor to blow out the iodine vapor; the flow rate of the air blowing gas is 0.5~5m 3 / h, the flow rate of bubbling air gas is 1~3m 3 / h;

[0024] (4) Blow out the iodine vapor to cool and crystallize in the desublimer to collect the final product, refined iodine;

[0025] (5) The tail gas coming out of the desublimer enters the washing tank for washing, and the tail gas washed by the washing liquid is discharged through the fan, and trace iodine in the tail gas is recovered at the same time.

[0026] The mass percent of iodine in the crude iodine in the above step (1) is 50-90%.

[0027] ...

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Abstract

The invention discloses a crude iodine purifying process which comprises the following steps of: (1) adding crude iodine into a ceramic reaction kettle, and adding 2-5% of pure alkali in percentage by mass; (2) starting a heating device to heat the reaction kettle, and controlling the temperature of the reaction kettle to be 120-180 DEG C; (3) inserting an air tube into the reaction kettle, and opening a compressor to blow out iodine steam; (4) cooling to crystallize the blown iodine steam, and subsequently collecting so as to obtain a final fine iodine product; (5) feeding tail gas discharged from a condenser into a washing tank to wash, discharging the tail gas washed by washing liquid through a fan, and at the same time recycling the iodine in the tail gas. By using the process disclosed by the invention, the iodine in the tail gas with iodine steam or iodine in the overflowed iodine-containing gas is captured and recycled, so that not only is the environment protected, but also the iodine resource is sufficiently and efficiently recycled, the waste is turned into wealth, and good economic values are achieved.

Description

technical field [0001] The present invention relates to separation, in particular to the purification of crude iodine. Background technique [0002] As one of the important inorganic chemical raw materials, iodine plays a pivotal role in the national economy. At present, the refined iodine with high purity is a scarce resource in the world. The applicant once applied for a patent with the application number 200810068752.6 "A Method for Refining Industrial Crude Iodine". This technical solution can achieve better results, but if the tail gas of iodine-containing steam or escaped iodine-containing gas is directly discharged, it will not only cause iodine Waste of resources and harm to the environment. In the present invention, chemical substances are added for impurity removal, and compressed air is used as a blowing agent and a gasification agent for iodine vapor to purify iodine in a sublimation method to obtain refined iodine with an iodine content ≥ 99.5%. [0003] ...

Claims

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Application Information

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IPC IPC(8): C01B7/14
Inventor 何浩明杨三可宋锡高张涛雷学联罗贤松覃礼云陆兴忠
Owner WENGFU (GRP) CO LTD
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