High-efficiency defoaming agent for sewage treatment, and preparation method and application thereof

A technology of sewage treatment and defoaming agent, which is applied in the direction of degassed water/sewage treatment, separation methods, chemical instruments and methods, etc. It can solve the problems of affecting sewage treatment efficiency, complex sewage components, poor defoaming ability, etc., and achieve control Effects of foaming, improving fermentation efficiency, and improving processing capacity

Active Publication Date: 2018-12-18

NANTONG HANTAI CHEM

8 Cites 1 Cited by

AI-Extracted Technical Summary

Problems solved by technology

Due to the complex composition of sewage, especially domestic sewage will generate a lot of foam during the treatment process, which will seriously affect the efficiency of sewage treatment, so it is necessary to add defoamers

[0003] At present, the defoamers used in sewage treatment mainly include silicone and polyether. Silicone defoams qu...

Abstract

The invention discloses a high-efficiency defoaming agent for sewage treatment, and a preparation method and application thereof. The high-efficiency defoaming agent comprises the following raw materials: polydimethylsiloxane, hydrophobic fumed silica, polyether-modified silicone oil, sodium 3,3'-dithiodipropane sulfonate, isopropyl myristate, n-butyl oleate, menthol and deionized water. The raw materials are easily available, so preparation cost is lowered; the prepared defoaming agent has good defoaming performance and foam suppression performance in water treatment, can effectively controlfoam, improves sewage treatment capacity, reduces pollution, and is very environmentally-friendly; and the defoaming agent also has good defoaming performance and foam suppression performance in fermentation and can improve fermentation efficiency.

Application Domain

Water/sewage treatment by degassingFoam dispersion/prevention

Technology Topic

ChemistrySewage treatment +12

Examples

Experimental program(7)
Comparison scheme(4)

Example Embodiment

[0026] Example 1

[0027] A high-efficiency defoamer for sewage treatment, comprising the following components in parts by weight: 30 parts of polydimethylsiloxane, 2 parts of hydrophobic gas phase silica, 20 parts of polyether modified silicone oil, and polydisulfide dipropane 5 parts of sodium sulfonate, 4 parts of isopropyl myristate, 5 parts of n-butyl oleate, 1 part of menthol, 40 parts of deionized water;

[0028] The polydimethylsiloxane is a hydroxyl-terminated polydimethylsiloxane, the viscosity is 1000-2000 Cst, and the hydroxyl content is 8%-10%;

[0029] The appearance of the polyether-modified silicone oil is a light yellow transparent oily liquid; when the temperature is 25° C., the density is 1.03 g/ml; and the viscosity is 2000-3000 Cst.

[0030] A preparation method of a high-efficiency defoamer for sewage treatment, comprising the following steps:

[0031] (1) Weigh hydrophobic fumed silica and sodium polydithiodipropane sulfonate by weight and carry out planetary ball milling for 1 hour in the tank, then pass through a 200-mesh sieve after grinding and place in a vacuum drying oven, at 60 Dry for 2h;

[0032] (2) Weigh polydimethylsiloxane and polyether modified silicone oil by weight and add in the stirred tank, be warming up to 190 ° C, add the mixture and menthol after step (1) drying, under 300 rev/min conditions Filled with nitrogen, stirred for 4 h, cooled to 70 °C to obtain mixture A;

[0033] (3) get 1/2 deionized water and be heated to 60 ℃, add isopropyl myristate, n-butyl oleate and menthol successively under stirring condition, continue stirring 30min, obtain mixture B;

[0034] (4) Add mixture B into mixture A slowly, continue stirring at 70°C for 60min, during which the remaining deionized water is slowly added;

[0035] (5) Passing the above-mentioned (4) result while hot through a homogenizer, and cooling to obtain a finished product.

Example Embodiment

[0036] Example 2

[0037] A high-efficiency defoamer for sewage treatment, comprising the following components in parts by weight: 32 parts of polydimethylsiloxane, 3 parts of hydrophobic gas phase silica, 23 parts of polyether modified silicone oil, and polydisulfide dipropane 6 parts of sodium sulfonate, 5 parts of isopropyl myristate, 6 parts of n-butyl oleate, 2 parts of menthol, 42 parts of deionized water;

[0038] The polydimethylsiloxane is a hydroxyl-terminated polydimethylsiloxane, the viscosity is 1000-2000 Cst, and the hydroxyl content is 8%-10%;

[0039] The appearance of the polyether-modified silicone oil is a light yellow transparent oily liquid; when the temperature is 25° C., the density is 1.03 g/ml; and the viscosity is 2000-3000 Cst.

[0040] A preparation method of a high-efficiency defoamer for sewage treatment, comprising the following steps:

[0041] (1) Weigh hydrophobic fumed silica and sodium polydithiodipropane sulfonate by weight and carry out planetary ball milling for 1.3 hours in a pot, then pass through a 200-mesh sieve after grinding and place in a vacuum drying oven, at 62° C. under drying for 2h;

[0042] (2) Weigh polydimethylsiloxane and polyether-modified silicone oil by weight and add in the stirred tank, be warming up to 195° C., add step (1) after drying mixture and menthol, under 350 rev/min conditions Filled with nitrogen, stirred for 4.5 h, and cooled to 72 °C to obtain mixture A;

[0043] (3) get 1/2 deionized water and be heated to 63 ℃, add isopropyl myristate, n-butyl oleate and menthol successively under stirring condition, continue stirring 40min, obtain mixture B;

[0044] (4) Add mixture B into mixture A slowly, continue stirring for 65min at 72°C, during which the remaining deionized water is slowly added;

[0045] (5) Passing the above-mentioned (4) result while hot through a homogenizer, and cooling to obtain a finished product.

Example Embodiment

[0046] Example 3

[0047] A high-efficiency defoamer for sewage treatment, comprising the following components in parts by weight: 35 parts of polydimethylsiloxane, 4 parts of hydrophobic gas phase silica, 25 parts of polyether modified silicone oil, and polydisulfide dipropane 8 parts of sodium sulfonate, 6 parts of isopropyl myristate, 7 parts of n-butyl oleate, 3 parts of menthol, 45 parts of deionized water;

[0048] The polydimethylsiloxane is a hydroxyl-terminated polydimethylsiloxane, the viscosity is 1000-2000 Cst, and the hydroxyl content is 8%-10%;

[0049] The appearance of the polyether-modified silicone oil is a light yellow transparent oily liquid; when the temperature is 25° C., the density is 1.03 g/ml; and the viscosity is 2000-3000 Cst.

[0050] A preparation method of a high-efficiency defoamer for sewage treatment, comprising the following steps:

[0051] (1) Weigh hydrophobic fumed silica and sodium polydithiodipropane sulfonate by weight and carry out planetary ball milling in a pot for 1.5 hours. under drying for 2h;

[0052] (2) Weigh polydimethylsiloxane and polyether-modified silicone oil by weight and add it to the stirred tank, be warming up to 200° C., add the mixture and menthol after drying in step (1), under 400 rev/min conditions Filled with nitrogen, stirred for 5 h, cooled to 73 °C to obtain mixture A;

[0053] (3) get 1/2 deionized water and be heated to 65 ℃, add isopropyl myristate, n-butyl oleate and menthol successively under stirring condition, continue stirring 45min, obtain mixture B;

[0054] (4) Add mixture B into mixture A slowly, continue stirring at 73 ° C for 75 min, during which the remaining deionized water is slowly added;

[0055] (5) Passing the above-mentioned (4) result while hot through a homogenizer, and cooling to obtain a finished product.

PUM

Property	Measurement	Unit
Density	1.03	g/ml

Description & Claims & Application Information

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High-efficiency defoaming agent for sewage treatment, and preparation method and application thereof

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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