Water body-oriented low-COD defoaming agent non-toxic to microorganisms and preparation method of defoaming agent

A defoamer and microorganism technology, applied in the field of low COD defoamer for water body and its preparation, can solve the problems of increasing the COD content of water body, etc., and achieve the effects of long foam suppression time, high efficiency and reduction of surface tension

Pending Publication Date: 2020-12-11
JIANGSU SAIOUXINYUE DEFOAMER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN101422712A discloses a defoamer composition, the composition is polydimethylsiloxane terminated by trimethylsiloxane group, polydimethylsiloxane terminated by hydroxyl group, organic resin in catalyst Under the action of cross-linking, and then treated with white carbon black to obtain a defoamer; the defoamer has a faster defoaming performance, but the defoamer has a faster defoaming speed in a non-ionic system , and the organic resin is used in the defoamer, which is used to treat the foam in the sewage, which will increase the COD content of the water body

Method used

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  • Water body-oriented low-COD defoaming agent non-toxic to microorganisms and preparation method of defoaming agent
  • Water body-oriented low-COD defoaming agent non-toxic to microorganisms and preparation method of defoaming agent

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preparation example Construction

[0039] Water body among the present invention uses the preparation method of low COD defoamer, comprises the steps:

[0040] (1) Under the action of an acid catalyst, formic acid or acetic acid, hydrogen peroxide, and castor oil are heated and reacted. After the reaction, the product is moved into a separatory funnel to separate and obtain the upper oil phase, and the upper oil phase is washed with water and discarded. Phase, and then through alkali washing, water washing, and vacuum distillation to obtain epoxy castor oil; then add epoxy castor oil and amino silicone oil to the organic solvent, and then add a basic catalyst to it, and stir the reaction at 60-80°C for 8- After 12 hours, the supernatant was taken by centrifugation, and then the organic solvent was removed by rotary evaporation to obtain amino silicone oil modified epoxy castor oil.

[0041] (2) According to the ratio, add polydimethylsiloxane, mineral oil, amino silicone oil modified epoxy castor oil, hydrophob...

Embodiment 1

[0055] The preparation method of low COD defoamer for water body in the present embodiment is:

[0056] (1) Put formic acid, hydrogen peroxide, and castor oil in a reaction kettle with a molar ratio of 3:8:6, add concentrated sulfuric acid (1mol formic acid needs to be added with 0.3mL concentrated sulfuric acid), heat to 60°C, and react for 6 hours After the reaction, the product was transferred into a separatory funnel, and the upper oil phase was obtained by separation. The upper oil phase was washed with hot distilled water (50-60° C.), the water phase was discarded, and then neutralized by sodium hydroxide, and then washed with distilled water Distillation under reduced pressure after washing obtains epoxy castor oil; Then epoxy castor oil, amino silicone oil (mole dosage ratio is 1:3) is added in N, N dimethylformamide, then adds sodium hydroxide (1mol ring Oxygenated castor oil needs to be added with 0.5mL sodium hydroxide), stirred and reacted at 60°C for 12 hours, the...

Embodiment 2

[0059] The preparation method of low COD defoamer for water body in the present embodiment is:

[0060] (1) Put formic acid, hydrogen peroxide, and castor oil in a reaction kettle with a molar ratio of 3:10:8, add concentrated sulfuric acid (1mol of formic acid needs to be added with 0.5mL concentrated sulfuric acid), heat to 70°C, and react for 3 hours After the reaction, the product was transferred into a separatory funnel, and the upper oil phase was obtained by separation. The upper oil phase was washed with hot distilled water (50-60° C.), the water phase was discarded, and then neutralized by sodium hydroxide, and then washed with distilled water Distillation under reduced pressure after washing obtains epoxy castor oil; Then epoxy castor oil, amino silicone oil (mole dosage ratio is 1:5) are added in N, N dimethyl formamide, then add sodium hydroxide (1mol ring Oxygenated castor oil needs to be added with 1.0mL sodium hydroxide), stirred and reacted at 60-80°C for 8-12 ...

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Abstract

The invention belongs to the technical field of chemical additives, and particularly discloses a water body-oriented low-COD defoaming agent non-toxic to microorganisms and a preparation method of thedefoaming agent. The defoaming agent is prepared from the following components in parts by weight: 10-20 parts of polydimethylsiloxane, 20-40 parts of mineral oil, 20-40 parts of amino silicone oil modified epoxy castor oil, 1-10 parts of hydrophobic white carbon black, 0.5-5 part of a defoaming aid and 0.1-10 part of an emulsifier.The preparation method comprises the following steps of: adding the epoxy castor oil and amino silicone oil into an organic solvent; adding a basic catalyst; performing stirring for reaction for 8-12 hours at the temperature of 60-80 DEG C; performing centrifugingto obtain supernatant; and carrying out rotary evaporation to remove the organic solvent, thereby obtaining the silicone oil modified epoxy castor oil. The defoaming agent disclosed by the invention is good in chemical stability, small in dosage, high in defoaming speed, long in foam inhibition time, high in efficiency, non-toxic to microorganisms and easy to disperse in sewage, and can reduce thesurface tension of a foam film, quickly eliminate foam and solve the problem of foam generated by biochemical sewage treatment.

Description

technical field [0001] The invention relates to the technical field of chemical auxiliary agents, in particular to a low-COD defoamer for water bodies that is non-toxic to microorganisms and a preparation method thereof. Background technique [0002] Large cities generally adopt biochemical water treatment methods to treat industrial sewage. Biochemical wastewater treatment processes include biofilm, activated sludge, etc. Biological sewage treatment can remove organic matter in sewage, convert organic pollutants into organic-rich gas, liquid products and solid products, and perform solid-liquid separation through sedimentation tanks. However, in the process of biochemical sewage treatment, foaming problems are prone to occur. The cause of foaming in biochemical sewage treatment is mainly related to the abnormal growth of microorganisms in activated sludge. The foam produced by the abnormal growth of microorganisms in activated sludge will accumulate on the water surface,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D19/04
CPCB01D19/0404B01D19/0409B01D19/0413B01D19/0495
Inventor 陈士海杨柏忠
Owner JIANGSU SAIOUXINYUE DEFOAMER
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