Special defoaming agent for secondary lead smelting flue gas desulfurization process and preparation method thereof

A technology of recycled lead smelting and defoaming agent, applied in the direction of foam dispersion/prevention, etc., can solve the problems of unsatisfactory defoaming effect of recycled lead smelting desulfurization system, decreased quality of by-product gypsum, and increased surface tension of slurry, etc., which is not easy to achieve. The effect of demulsification, good self-emulsifying performance and low surface tension

Inactive Publication Date: 2015-03-04
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the quality of limestone is not good, such as the content of magnesium oxide is too high, it will not only affect the desulfurization efficiency, but also produce a lot of foam when it reacts with sulfate
The impurities in the flue gas enter the absorption tower, which also increases the organic matter or heavy metal ions in the slurry of the absorption tower, and saponification occurs, forming an oil film on the surface of the slurry, causing the surface tension of the slurry to increase, thereby causing foaming on the surface of the slurry, which will affect the desulfurization efficiency. low, the system cannot run stably, and the quality of the by-product gypsum will decrease, etc.
[0005] Although there are many types of defoamers on the market, the effect of defoaming in the desulfurization system of secondary lead smelting is not satisfactory. Therefore, a low-cost, targeted and efficient defoamer is needed to solve this problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 1) Preparation of active ingredients

[0041] In the reaction kettle with inert gas atmosphere, add 30 parts of methanol (analytical pure), 0.3 parts of NaOH (analytical pure), control the temperature of the reaction kettle at 90 ° C, and continuously feed 40 parts of ethylene oxide gas. Then continue to react for 1h, carry out ring-opening polymerization, synthesize terminal methyl polyether alcohol, then add 1 part of sodium methoxide-methanol solution (mass fraction is 30%), 70 parts of CH 3 Cl, carry out capping reaction at a temperature of 110° C., and obtain terminal methyl polyoxyethylene methyl ether after reacting for 8 hours. Then add 100 parts of simethicone oil with an average viscosity of 100cS and 0.5 parts of additive calcium oleate, maintain an inert gas atmosphere and a temperature of 110°C, and continue stirring for 3 hours to carry out copolymerization reaction to synthesize polyether-polysiloxane-additive copolymerization thing.

[0042] 2) Prepara...

Embodiment 2

[0045] 1) Preparation of active ingredients

[0046] In the reaction kettle with inert gas atmosphere, add 30 parts of methanol (analytical pure), 0.5 parts of NaOH (analytical pure), control the temperature of the reaction kettle at 110 ° C, and continuously feed 60 parts of ethylene oxide e gas. Continue to react for 2 hours after completion, carry out ring-opening polymerization, and synthesize terminal methyl polyether alcohol, then add 1.5 parts of sodium methoxide-methanol solution (mass fraction is 35%), 130 parts of CH 3 Cl, carry out capping reaction at a temperature of 120° C., and obtain terminal methyl polyoxyethylene methyl ether after reacting for 10 hours. Then add 180 parts of simethicone oil with an average viscosity of 500cS and 1 part of additive sodium oleate, keep an inert gas atmosphere and a temperature of 120°C, and continue stirring for 4 hours to carry out copolymerization reaction to synthesize polyether-polysiloxane-additive copolymerization thing. ...

Embodiment 3

[0050] 1) Preparation of active ingredients

[0051] Add 30 parts of methanol (analytical pure) and 1 part of NaOH (analytical pure) to the reactor in an inert gas atmosphere, control the temperature of the reactor at 120°C, and continuously feed 80 parts of ethylene oxide gas until the Then continue to react for 1.5h, carry out ring-opening polymerization, and synthesize terminal methyl polyether alcohol, then add 2 parts of sodium methoxide-methanol solution (mass fraction is 33%), 100 parts of CH 3 Cl, carry out capping reaction at a temperature of 120° C., and obtain terminal methyl polyoxyethylene methyl ether after reacting for 9 hours. Then add 200 parts of simethicone oil with an average viscosity of 1000cS and 2 parts of additives (1 part each of calcium oleate and sodium oleate), keep an inert gas atmosphere and a temperature of 120°C, and continue stirring for 5 hours to carry out copolymerization reaction to synthesize polyether - Polysiloxane-additive copolymers....

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PUM

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Abstract

The invention discloses a special defoaming agent for secondary lead smelting flue gas desulfurization process, which comprises the following components: 80-90 parts by weight of hydrocarbon carrier, 9-14 parts by weight of active ingredient, 1 part by weight of thickening agent and 0-2 parts by weight of other additive, wherein other additive is ethanol, ethylene glycol, propylene glycol, glycerol or the combination of the ethanol, the ethylene glycol, the propylene glycol and the glycerol; and the active ingredient is polyether-polysiloxane-additive copolymer with self-emulsifying capability. The invention also discloses a preparation method of the defoaming agent; and the prepared special defoaming agent can be used for the secondary lead smelting flue gas desulfurization process, and has a very good defoaming effect.

Description

technical field [0001] The present invention relates to a novel high-efficiency self-emulsifying defoamer suitable for the flue gas desulfurization process of secondary lead smelting and its preparation method. More precisely, the present invention relates to the characteristics of the flue gas desulfurization system and equipment in secondary lead smelting , modify the active ingredients in the defoamer, and then compound specific carriers and additives to prepare a targeted, safe, efficient and economical defoamer. It belongs to the field of fine chemical technology. Background technique [0002] In the flue gas desulfurization process of secondary lead smelting, a large amount of harmful foam will be generated due to the impurities in the flue gas and the quality difference of the limestone slurry. If the defoaming is not suppressed, the foam will reduce the effective load of the desulfurization equipment and prolong the production process. Response time increases energy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D19/04C08G81/00C08G65/337C08G65/331C08G65/28C08K5/098
Inventor 舒月红朱龙冠陈红雨
Owner SOUTH CHINA NORMAL UNIVERSITY
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