Method for delaying deposition of sieve plate of extraction column

A technology of extraction column and platen, which is applied in the field of delaying the fouling of the sieve plate of the extraction column, and can solve the problems of system shutdown, low start-up rate, clogging of the sieve plate of the extraction column, etc.

Active Publication Date: 2009-09-16
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this state of production, the sieve plate of the extraction tower will be blocked after driving for more than ten hours, causing the system to stop. After parking, it will take one to two days or even l

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] A method for delaying fouling of extraction tower sieve plates, comprising:

[0013] (1) The condensate obtained from the low-pressure steam heat exchange of the phosphoric acid concentration production system is introduced into the heat exchanger, and the temperature of the condensate is about 120°C;

[0014] (2) The extractant to be added to the extraction tower is introduced into the heat exchanger to exchange heat with the condensate entering the heat exchanger to increase the temperature of the extractant; the extractant is controlled by adjusting the amount of condensate entering the heat exchanger Temperature, through the adjustment of the temperature of the extractant, the temperature difference between the acid temperature in and out of the tower is controlled at 10°C.

[0015] (3) The extractant whose temperature is raised is sent into the extraction tower to realize the extraction of iodine in phosphoric acid.

Embodiment 2

[0017] A method for delaying fouling of extraction tower sieve plates, comprising:

[0018] (1) The condensate obtained from the low-pressure steam heat exchange of the phosphoric acid concentration production system is introduced into the heat exchanger, and the temperature of the condensate is about 120°C;

[0019] (2) The extractant to be added to the extraction tower is introduced into the heat exchanger to exchange heat with the condensate entering the heat exchanger to increase the temperature of the extractant; the extractant is controlled by adjusting the amount of condensate entering the heat exchanger Temperature, by adjusting the temperature of the extractant, the temperature difference between the acid entering and exiting the tower is controlled at 20°C.

[0020] (3) The extractant whose temperature is raised is sent into the extraction tower to realize the extraction of iodine in phosphoric acid.

Embodiment 3

[0022] A method for delaying fouling of extraction tower sieve plates, comprising:

[0023] (1) The condensate obtained from the low-pressure steam heat exchange of the phosphoric acid concentration production system is introduced into the heat exchanger, and the temperature of the condensate is about 100°C;

[0024] (2) The extractant to be added to the extraction tower is introduced into the heat exchanger to exchange heat with the condensate entering the heat exchanger to increase the temperature of the extractant; the extractant is controlled by adjusting the amount of condensate entering the heat exchanger Temperature, through the adjustment of the temperature of the extractant, the temperature difference between the acid temperature in and out of the tower is controlled at 5°C.

[0025] (3) The extractant whose temperature is raised is sent into the extraction tower to realize the extraction of iodine in phosphoric acid.

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Abstract

This invention discloses a method for delaying deposition of sieve plate of extraction column, including following steps: applying a condensing liquid generated by the heat exchange of low pressure steam of a phosphoric acid concentration production system, the temperature of the condensing liquid being in the range of 100 to 120 degrees centigrade; applying an extracting agent that will be added into the extraction column to a heat exchanger so as to make it execute the heat exchange with the condensing liquid in the heat exchanger and to improve the extracting agent temperature; sending the extracting agent having higher temperature into the extraction column to realize the extraction to the iodine in the phosphoric acid; controlling the temperature of the extracting agent via adjusting the condensing liquid quantity in the heat exchanger, controlling the temperature difference of the acid temperature before entering and after existing from the column in the range of 5 to 20 degrees centigrade. This invention can reduce the deposition of the sieve plate of the extraction column, improve the system driving rate, thereby improving the running efficiency of the system and realizing the production cost.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for delaying fouling of sieve plates of extraction towers. Background technique [0002] Iodine is the basic raw material for the manufacture of inorganic or organic iodides, and an essential nutrient element for humans and plants. It is widely used in medicine, agriculture, dyes, metallurgy, synthetic rubber, national defense and cutting-edge technology fields. Iodine often exists in a variety of mineral resources in the form of associated ore. Due to its low grade, it cannot be well utilized. At present, the world's iodine industry mainly relies on extracting iodine from seawater. Elemental iodine is a purple-black, shiny solid with metal-like properties and easy sublimation, and the product is mostly granular. The extraction of iodine from phosphate rock is mainly carried out by using phosphoric acid produced from phosphate rock as a raw material. In the process of p...

Claims

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Application Information

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IPC IPC(8): B01D11/00
Inventor 金先煜张涛雷学联林世俊覃礼云罗贤松郑周勋刘勇姚石林
Owner WENGFU (GRP) CO LTD
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