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Continuous crystallization process for monopotassium phosphate

A crystallization technology of potassium dihydrogen phosphate, which is applied in the field of continuous crystallization process of potassium dihydrogen phosphate, which can solve the problems of easy leakage and splashing of materials, large equipment footprint, and product quality differences, so as to reduce the secondary nucleation phenomenon , low labor intensity, small footprint

Inactive Publication Date: 2013-06-19
HEBEI NUODA CHEM EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because most of the crystallization equipment used in this process is a simple stirred tank crystallizer, the crystallization process has the following disadvantages: 1) It is batch crystallization, which is not suitable for continuous operation; 2) The crystallization process takes a long time, The equipment used occupies a large area; 3) The operation requirements of the crystallization process are high, and the temperature and flow of the cooling medium need to be adjusted at any time. The stirred tank crystallizer is prone to local overcooling, which causes the material to be crystallized to condense on the heat exchange surface of the crystallizer, and then This makes the heat transfer effect worse, and eventually leads to an increase in the labor load of the subsequent crystallization process; 4) During the crystallization process, the material is prone to leakage and splashing due to stirring, and the operating environment is relatively harsh; 5) The crystallization operation is mainly completed by a large number of personnel. Higher operating costs; 6) Due to differences in professional quality between personnel, the overall crystallization operation and product stability are poor, and product quality in different batches may vary

Method used

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  • Continuous crystallization process for monopotassium phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The feed liquid to be crystallized is potassium dihydrogen phosphate solution produced by the neutralization method, and the material state of the feed liquid to be crystallized is: the temperature is 95° C., and the concentration is 44.2%.

[0027] The equipment used in the present invention mainly includes a primary continuous flash crystallizer 2, a secondary continuous cooling crystallizer 3, a thickener 4 and a centrifuge 5. The first-stage continuous flash crystallizer 2 is a DTB vacuum crystallizer, and the feed port at the bottom is connected with the inlet 14 of the feed liquid to be crystallized, and the feed liquid to be crystallized enters the DTB vacuum crystallizer with a feed rate of 22500kg / h. It enters the bottom of the guide tube in the center of the inner center of the DTB vacuum crystallizer, and then starts to rise from the bottom of the guide tube along the guide tube under the push of the propeller, and rises to the liquid level in the DTB vacuum c...

Embodiment 2

[0039] The difference between this embodiment and Example 1 is that the feed liquid to be crystallized is a potassium dihydrogen phosphate solution produced by ion exchange, and the material state of the feed liquid to be crystallized is: the temperature is 96° C., and the concentration is 44.1%.

[0040] The feed port of the first-stage continuous flash crystallizer 2 is connected with the dynamic filter, and the feed port of the dynamic filter is connected with the feed liquid inlet 14 to be crystallized.

[0041] The feed liquid to be crystallized enters the dynamic filter at a feed rate of 6430kg / h, and the feed liquid to be crystallized from the dynamic filter enters the DTB vacuum crystallizer. The flow velocity of the secondary clear liquid in the tube side of the external cooler 3-1 is 1.65m / s.

[0042] The primary magma discharged from the discharge port of the first-stage continuous flash crystallizer 2, the secondary magma discharged from the discharge port of the s...

Embodiment 3

[0048] The difference between this embodiment and Example 1 is that the feed liquid to be crystallized is a potassium dihydrogen phosphate solution produced by ion exchange, and the material state of the feed liquid to be crystallized is: the temperature is 93° C., and the concentration is 39.6%.

[0049] The feed liquid to be crystallized enters the DTB vacuum crystallizer at a feed rate of 12380kg / h. The flow velocity of the secondary clear liquid in the tube side of the external cooler 3-1 is 1.8m / s.

[0050] The primary magma discharged from the discharge port of the first-stage continuous flash crystallizer 2, the secondary magma discharged from the discharge port of the secondary continuous cooling crystallizer 3, and the three times discharged from the discharge port of the thickener 4 The state of the crystal slurry is shown in Table 3 below.

[0051] table 3

[0052]

Primary slurry

Secondary crystal slurry

Tertiary crystal slurry

temper...

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Abstract

The invention discloses a continuous crystallization process for monopotassium phosphate. The continuous crystallization process comprises the following specific steps of: introducing a feed liquid to be crystallized into a first-stage continuous flash crystallizer so as to be separated into a primary clear liquid, primary crystal mush and secondary steam; discharging the primary crystal mush from the first-stage continuous flash crystallizer and feeding the primary crystal mush into a second-stage continuous cooling crystallizer, wherein the second-stage continuous cooling crystallizer is composed of an Oslo crystallizer and an external cooler; separating the primary crystal mush into secondary crystal mush and a secondary clear liquid in the Oslo crystallizer; discharging the secondary crystal mush from the Oslo crystallizer, feeding the secondary crystal mush into a thickener and separating the secondary crystal mush into triple clear liquid and triple crystal mush; discharging the triple crystal mush from the thickener, feeding the triple crystal mush into a centrifugal machine, and separating the triple crystal mush into solid monopotassium phosphate and a centrifugal liquid; and discharging the solid monopotassium phosphate from the centrifugal machine. The continuous crystallization process is stable in operation, low in energy consumption and low in labor intensity; and by using the continuous crystallization process, the operation stability and the product quality are greatly improved, the on-site operation environment is improved, and the production cost of the monopotassium phosphate is reduced. A mating device for the process is small in floor area and high in capacity.

Description

technical field [0001] The invention relates to a production method of potassium dihydrogen phosphate, in particular to a crystallization process of potassium dihydrogen phosphate. Background technique [0002] Potassium dihydrogen phosphate is an important chemical, which is widely used in agriculture, chemical industry, medicine and food industries. In the chemical industry, potassium dihydrogen phosphate can be used as a buffer, a culture agent, a raw material for making potassium metaphosphate, a fermentation aid, a culture agent, a strengthening agent, and a leavening agent for brewing yeast; in agriculture, potassium dihydrogen phosphate It is a high-concentration and high-efficiency phosphorus and potassium compound fertilizer; in medicine, potassium dihydrogen phosphate can be used to acidify uric acid, as a nutrient, etc.; in food, potassium dihydrogen phosphate can be used as a flavoring agent for synthetic sake. [0003] At present, the production methods of pota...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/30
Inventor 王锋于少华史昱
Owner HEBEI NUODA CHEM EQUIP
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