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A kind of preparation method of defoamer used in wet-process phosphoric acid production

A wet-process phosphoric acid and defoamer technology, applied in the direction of foam dispersion/prevention, can solve the problem of less experience and effect reports of defoamer, achieve no effect on crystallization, good defoaming effect, and simple operation Effect

Inactive Publication Date: 2011-12-21
HUBEI FORBON TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are not many types of chemical defoamers used in wet-process phosphoric acid defoaming in my country, and there are few reports on the experience and effects of defoamers.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] From 1.2 mole parts of stearic acid and 1 mole part of polyoxyethylene polyoxypropylene block polymer, and 0.1 mole of p-toluenesulfonic acid catalyst, under the condition of reaction temperature of 120 ° C, the reaction time is 5 hours, and the product is The defoamer of the present invention. The prepared defoamer has good defoaming and antifoaming effects in the production of wet-process phosphoric acid, and the defoaming rate and antifoaming rate are all above 95%, and has no effect on the next step process, especially for There is no effect on the brightness and crystallization of DAP granulation.

Embodiment 2

[0014] From 1.1 mole parts of palmitic acid and 1 mole part of polyoxyethylene polyoxypropylene block polymer, and 0.1 mole of p-toluenesulfonic acid catalyst, under the condition of reaction temperature of 130 ° C, the reaction time is 4 hours, the product is this Invented defoamer. The prepared defoamer has good defoaming and antifoaming effects in the production of wet-process phosphoric acid, and the defoaming rate and antifoaming rate are all above 95%, and has no effect on the next step process, especially for There is no effect on the brightness and crystallization of DAP granulation.

Embodiment 3

[0016] From 1.3 moles of lauric acid and 1 mole of polyoxyethylene polyoxypropylene block polymer, and 0.1 moles of p-toluenesulfonic acid catalyst, at a reaction temperature of 110 ° C, the reaction time is 6 hours, and the product is this Invented defoamer. The prepared defoamer has good defoaming and antifoaming effects in the production of wet-process phosphoric acid, and the defoaming rate and antifoaming rate are all above 95%, and has no effect on the next step process, especially for There is no effect on the brightness and crystallization of DAP granulation.

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PUM

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Abstract

The invention relates to a method for preparing a defoamer used in the production of wet-process phosphoric acid, which is characterized in that it is carried out according to the following steps: 1.1-1.3 mole parts of fatty acid, 1 mole part of polyether, and 0.1 mole of p-toluenesulfonic acid Catalyst, the reaction temperature is 110-130°C, the reaction time is 4-6 hours, and the product is the defoamer. The preparation method of the present invention is simple to operate, and compared with other defoamers, the dosage is less, and has high-efficiency, rapid and lasting defoaming effect. The defoamer prepared by the present invention has a good The defoaming effect and antifoaming effect, the defoaming rate and antifoaming rate are above 95%, it is an ideal defoaming agent in wet-process phosphoric acid, has a good application prospect, and has no effect on the next process. In particular, it has no effect on the brightness and crystallization of the granulated diammonium phosphate produced.

Description

technical field [0001] The invention relates to the field of industrial defoamers, in particular to a method for preparing a defoamer used in the production of wet-process phosphoric acid. Background technique [0002] In the production of wet-process phosphoric acid, when the content of carbonate and organic matter in phosphate rock powder is high, a large amount of CO will be produced by chemical reaction with acid 2 gas. With the intense acidolysis process, CO 2 Continuously dispersed in the reaction solution containing organic components, a stable foam layer is formed on the slurry surface, and its volume usually reaches 5% to 10% of the reaction solution volume, which has many adverse effects on the production of wet-process phosphoric acid. Firstly, it affects the dispersion and acidolysis reaction of phosphate rock powder, resulting in a decrease in production capacity; secondly, the foam layer not only reduces the utilization rate of equipment, but also makes it di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/00B01D19/04
Inventor 左大学王仁宗
Owner HUBEI FORBON TECH
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