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Anti-foaming agent for wet-process phosphoric acid production and preparation method thereof

A wet-process phosphoric acid and defoamer technology, applied in separation methods, chemical instruments and methods, foam dispersion/prevention, etc., can solve the problems of increasing the viscosity of phosphoric acid production slurry, unfavorable filtration process treatment, general defoaming effect, etc. To achieve the effect of improving diffusion capacity, improving foam suppressing capacity, and improving foam suppressing performance

Active Publication Date: 2018-06-15
CNOOC TIANJIN CHEM RES & DESIGN INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing defoamers in the market mainly include tall oil esters, oleic acid and its sulfate, and fatty acid amides. The existing defoamers have a general defoaming effect in the industrial application of wet-process phosphoric acid production, and the foam suppression time is relatively short. problems, and even increased the viscosity of the phosphoric acid production slurry, which is not conducive to the subsequent filtration process

Method used

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  • Anti-foaming agent for wet-process phosphoric acid production and preparation method thereof
  • Anti-foaming agent for wet-process phosphoric acid production and preparation method thereof
  • Anti-foaming agent for wet-process phosphoric acid production and preparation method thereof

Examples

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Effect test

Embodiment 1

[0023] Preparation of defoamer: In a closed reactor, add 6g allyl polyether (molecular weight 1200, where EO:PO=1:1), add 2g hydrogen-containing silicone oil (hydrogen content 1.6%) and 1g iso Propanol, add catalyst chloroplatinic acid, the reactor is repeatedly replaced with nitrogen and stirred, heated to 120 ℃ for 3 hours, add 3g magnesium stearate and 50g polyether A (molecular weight 2100, hydroxyl value: 50 ~ 60mgKOH / g), heat preservation and maturation reaction for 0.5 hours, and finally add 6 g of coconut oil fatty acid diethanolamide, 30 g of ethanol and 60 g of water into the reactor, continue to stir uniformly, and finally cool and discharge the defoamer I.

Embodiment 2

[0025] Preparation of defoamer: In a closed reactor, add 6g allyl polyether (molecular weight 800, where EO:PO=1:1), add 2g hydrogen-containing silicone oil (hydrogen content 1.6%) and 1g iso Propanol, add catalyst chloroplatinic acid, the reactor is repeatedly replaced with nitrogen and stirred, heated to 115°C and reacted for 2.5 hours, add 3g magnesium stearate and 50g polyether A (molecular weight 2500, hydroxyl value: 50-60mgKOH / g), heat preservation and maturation reaction for 0.5 hours, and finally add 6g coconut oil fatty acid diethanolamide, 30g ethanol and 60g water into the reactor, continue to stir uniformly, and finally cool and discharge the defoamer II.

Embodiment 3

[0027] Preparation of defoamer: In a closed reactor, add 6g of allyl polyether (molecular weight 1200, where EO:PO=1:1), add 2g of hydrogen-containing silicone oil (hydrogen content of 1.6%), and 1g Isopropanol, add catalyst chloroplatinic acid, the reactor is repeatedly replaced with nitrogen and stirred, heated to 120 ℃ for 3 hours, add 3g magnesium stearate and 50g polyether A (molecular weight 2100, hydroxyl value: 50-60mgKOH / g), heat preservation and maturation reaction for 0.5 hours, and finally 6g dioctyl sulfosuccinate sodium salt, 30g methanol and 60g water are added into the reactor, continue to stir uniformly, and finally cool the material to obtain defoamer III.

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Abstract

The invention discloses an anti-foaming agent for wet-process phosphoric acid production and a preparation method thereof. The anti-foaming agent comprises, by weight, 10 to 20 parts of a polyether A,1 to 5 parts of modified silicone polyether, 0.5 to 2 parts of an active carrier, 1 to 5 parts of a diffusion agent, 5 to 20 parts of an organic solvent and 30 to 50 parts of deionized water. The anti-foaming agent retains good defoaming effects in a strong acid under a low concentration and does not influence the quality of phosphoric acid. The anti-foaming agent is suitable for wet-process phosphoric acid production and is suitable for defoaming a strong acidic medium in mining.

Description

Technical field [0001] The invention relates to the technical field of defoaming for the production of wet-process phosphoric acid, in particular to the CO in the production process of wet-process phosphoric acid 2 A stable foam layer defoamer formed by continuously dispersing in a reaction liquid and a preparation method thereof. Background technique [0002] In the production of wet-process phosphoric acid, when the content of carbonate and organic matter in the phosphate rock powder is high, a large amount of CO is generated by chemical reaction with acid 2 The gas, as the acid hydrolysis process proceeds, CO 2 It is continuously dispersed in the reaction liquid containing organic components to form a stable foam layer of 300-700 mm on the surface of the acid hydrolysis tank, the volume of which can usually reach 5%-10% of the volume of the reaction liquid. It has had some adverse effects on the production of wet-process phosphoric acid. First, the dispersant acidolysis reacti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D19/04
CPCB01D19/0404
Inventor 魏清姚光源闫岩张迪彦王惠章甦王宁
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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