Tween 85 and low-cloud-point fatty alcohol polyether compounded slag wastewater defoaming agent and preparation method thereof

Abstract

The invention discloses a defoaming agent for the slag cleaning industry, and belongs to the technical field of defoaming agents. The invention particularly discloses a Tween 85 and low-cloud-point fatty alcohol polyether compounded slag wastewater defoaming agent and a preparation method thereof. The invention relates to a Tween 85 and low-cloud-point fatty alcohol polyether compounded slag wastewater defoaming agent, which is prepared from the following raw materials in parts by weight: 10 to 30 parts of Tween 85, 20 to 80 parts of low-cloud-point fatty alcohol polyether, 1 to 5 parts of foam inhibitor and 10 to 20 parts of alkali-resistant surfactant. The Tween 85 is compounded with the low-cloud-point fatty alcohol polyether, the foam inhibitor and the alkali-resistant surfactant, so that the defoaming effect and durability of the defoaming agent can be enhanced, and repeated generation of foam is inhibited.

Description

Technical Field

[0001] The present application relates to the technical field of defoamers, and in particular to a slag wastewater defoamer prepared by compounding Tween 85 with low-cloud-point fatty alcohol polyether and a preparation method thereof. Background Art

[0002] During the incineration process, one of the wastes is slag, which is rich in resources and has a large output, but has a certain degree of environmental pollution. It is an inevitable requirement for sustainable development to realize its resource utilization through screening, separation and recycling. During the slag screening and recycling process, a large amount of slag wastewater will be generated. Due to the complex composition of slag, especially the high alkalinity and high turbidity characteristics of slag wastewater, a large amount of foam is easily generated under impact, which seriously affects the efficiency and effect of wastewater treatment.

[0003] Existing defoamers mostly use a single ingredient. Although they can eliminate foam to a certain extent, in the high-alkali and high-turbidity environment of slag wastewater treatment, a large amount of suspended solid particles or sediments in the wastewater are adsorbed on the surface of the defoamer, which will re-form foam, resulting in unstable defoaming effect, easy recurrence, poor anti-foaming properties and other problems. Summary of the invention

[0004] In order to improve the insufficient antifoaming performance of existing defoamers in high alkalinity and high turbidity environments, the present application provides a slag wastewater defoamer compounded with Tween 85 and low cloud point fatty alcohol polyether and a preparation method thereof.

[0005] In the first aspect, the present application provides a slag wastewater defoamer compounded with Tween 85 and low cloud point fatty alcohol polyether, using the following technical solution: A slag wastewater defoamer compounded with Tween 85 and low-cloud point fatty alcohol polyether comprises the following raw materials in parts by weight: 10-30 parts of Tween 85, 20-80 parts of low-cloud point fatty alcohol polyether, 1-5 parts of foam inhibitor and 10-20 parts of alkali-resistant surfactant.

[0006] By adopting the above technical scheme, the compound of low cloud point fatty alcohol polyether and Tween 85 can be better dispersed in high turbidity slag wastewater, reduce the surface tension of the liquid, and have a faster defoaming effect. At the same time, the addition of foam inhibitors and alkali-resistant surfactants can maintain defoaming stability under high alkaline conditions and is not easy to decompose or fail, thereby being able to better and continuously and effectively inhibit the formation of foam in slag wastewater and adapt to the complex and changeable slag wastewater treatment environment.

[0007] Preferably, the low cloud point fatty alcohol polyether is at least one of polyoxyethylene polyoxypropylene ethers with a mixture of cetearyl alcohol and octadecyl alcohol, octadecyl alcohol, eicosanol and behenyl alcohol as initiators; and the cloud point of the low cloud point fatty alcohol polyether is lower than 15°C.

[0008] By adopting the above technical scheme, compared with high cloud point fatty alcohol polyether, the cloud point of polyoxyethylene polyoxypropylene ether with a mixture of 16-18 alcohol, 18 alcohol, 10-eicosanol and 12-eicosanol as initiators is adjusted to be lower than 15°C, which has a better defoaming effect in slag wastewater.

[0009] Preferably, the foam inhibitor is polydimethylsiloxane.

[0010] By adopting the above technical solution, polydimethylsiloxane can quickly reduce the surface tension of foam, destroy the stability of foam, and achieve rapid defoaming in wastewater. At the same time, polydimethylsiloxane has good heat resistance and can better adapt to the high-alkali and high-turbidity wastewater treatment environment. At the same time, in slag wastewater, polydimethylsiloxane has good spreadability and can quickly spread on the foam surface to form a thin liquid film, thereby preventing particulate impurities and suspended matter in the wastewater from causing foam again, reducing the repeated generation of foam, and improving the efficiency and stability of slag wastewater treatment.

[0011] Preferably, the alkali-resistant surfactant is silicone polyether.

[0012] By adopting the above technical scheme, the silicone polyether has strong antifoaming ability and alkali resistance, has good compatibility with other components in the defoamer system, has a more significant antifoaming effect in a high turbidity environment, and improves the alkali resistance and defoaming durability of the defoamer.

[0013] Preferably, the organosilicon polyether comprises the following raw materials in parts by weight: 50-80 parts of methyl-terminated allyl polyether, 20-50 parts of hydrogen-containing silicone oil, and 0.01-0.03 parts of chloroplatinic acid catalyst.

[0014] By adopting the above technical scheme, hydrogen-containing silicone oil can react with methyl-terminated allyl polyether, and allyl groups can react with silicon-hydrogen bonds in hydrogen-containing silicone oil, introducing functional groups of hydrogen-containing silicone oil into polyether molecules, thereby improving the thermal stability and wettability of polyether, and being able to effectively disperse on the surface of liquid in complex wastewater, preventing the generation of foam on the surface of liquid, and enhancing the adaptability and durability of defoamers in high-alkali and high-turbidity slag wastewater. Compared with conventional polyethers, the use of methyl-terminated allyl polyethers can enhance the reaction sites, and methyl-terminated polyethers can reduce the reaction of polyether surfactants with moisture and oxygen in the environment, and can resist the influence of ultraviolet rays and temperature changes on polyether surfactants, thereby improving the thermal stability, acid and alkali resistance and weather resistance of the defoamer, and improving the defoaming durability and defoaming stability of the defoamer in slag wastewater treatment.

[0015] Preferably, the molecular weight of the methyl terminated allyl polyether is 300-2000.

[0016] Preferably, the mass fraction of active hydrogen in the hydrogen-containing silicone oil is 0.18-0.36%.

[0017] By adopting the above technical scheme and selecting hydrogen-containing silicone oil with an active hydrogen concentration within a suitable range, the hydrogen-containing silicone oil and the methyl-terminated allyl polyether can be caused to react faster. Too low an active hydrogen mass fraction may slow down the reaction rate, reduce the reaction conversion rate, and thus affect the thermal stability of the polyether surfactant.

[0018] Preferably, the preparation method of the organosilicon polyether comprises the following specific steps: mixing hydrogen-containing silicone oil with methyl-terminated allyl polyether, stirring evenly, heating to 80-110°C, vacuum dehydrating, cooling to below 50°C, adding a catalyst, reacting at 80-120°C until transparent, keeping the temperature for reaction for 0.5-2h, and cooling to obtain the organosilicon polyether.

[0019] In the second aspect, the present application provides a method for preparing a slag wastewater defoamer compounded with Tween 85 and low cloud point fatty alcohol polyether, using the following technical scheme: A method for preparing a slag wastewater defoamer prepared by compounding Tween 85 with a low-cloud point fatty alcohol polyether comprises the following specific steps: uniformly mixing Tween 85, a low-cloud point fatty alcohol polyether, a foam inhibitor and an alkali-resistant surfactant to obtain the slag wastewater defoamer.

[0020] By adopting the above technical scheme and through the synergistic effect of various components, the defoaming agent is enabled to better adapt to the slag wastewater treatment environment, the durability of the defoaming effect is enhanced, and the problems of unstable defoaming effect and repeated foaming are reduced.

[0021] In summary, this application has the following beneficial effects: 1. Since the present application adopts a combination of low cloud point fatty alcohol polyether with Tween 85, foam inhibitor and alkali-resistant surfactant, it has a better defoaming effect in slag wastewater, reduces the influence of suspended matter and particulate matter in the slag wastewater, inhibits the repeated formation of foam, and is more suitable for the high turbidity slag wastewater treatment environment.

[0022] 2. In the present application, methyl-terminated allyl polyether and hydrogen-containing silicone oil are reacted to generate silicone polyether, which is added to the defoamer raw material to enhance the alkali resistance and defoaming durability of the defoamer. DETAILED DESCRIPTION

[0023] The present application is further described in detail below with reference to the embodiments.

[0024] All raw materials in the examples are commercially available.

[0025] Preparation Example 1 The organosilicon polyether comprises the following raw materials in parts by weight: 65g of methyl-terminated allyl polyether, 35g of hydrogen-containing silicone oil, and 0.02g of chloroplatinic acid catalyst. The mass fraction of active hydrogen in the hydrogen-containing silicone oil is 0.216%. The average molecular weight of the methyl-terminated allyl polyether is 800.

[0026] The preparation method of organosilicon polyether comprises the following specific steps: Mix hydrogen-containing silicone oil with methyl-terminated allyl polyether, stir evenly, heat to 100°C, dehydrate in vacuum, cool to below 50°C, mix chloroplatinic acid and isopropanol, the mass ratio of chloroplatinic acid catalyst to isopropanol is 1:100, form chloroplatinic acid catalyst, add 0.02g chloroplatinic acid catalyst, heat to 110°C to react until transparent, keep warm for 2h, and cool to obtain silicone polyether.

[0027] Preparation Example 2 The difference between Preparation Example 2 and Preparation Example 1 is that the amount of methyl-terminated allyl polyether used in the silicone polyether raw material is 80 g, the amount of hydrogen-containing silicone oil used is 20 g, and the amount of chloroplatinic acid catalyst used is 0.01 g.

[0028] Preparation Example 3 The difference between Preparation Example 3 and Preparation Example 1 is that the amount of methyl-terminated allyl polyether used in the organic silicon polyether raw material is 50 g, the amount of hydrogen-containing silicone oil used is 50 g, and the amount of chloroplatinic acid catalyst used is 0.03 g.

[0029] Preparation Example 4 The difference between Preparation Example 4 and Preparation Example 1 is that the mass fraction of active hydrogen in the hydrogenated silicone oil of the organosilicon polyether raw material is 0.18%.

[0030] Preparation Example 5 The difference between Preparation Example 5 and Preparation Example 1 is that the mass fraction of active hydrogen in the hydrogenated silicone oil of the organosilicon polyether raw material is 0.255%. Example Example 1

[0031] The present embodiment provides a slag wastewater defoamer compounded with Tween 85 and low cloud point fatty alcohol polyether, comprising the following raw materials in parts by weight: 20g of Tween 85, 50g of low cloud point fatty alcohol polyether, 3g of foam inhibitor, and 15g of alkali-resistant surfactant. The low cloud point fatty alcohol polyether is octadecyl alcohol polyoxyethylene ether polyoxypropylene ether, with a cloud point of 8°C, a molecular weight of 2000, and a viscosity of 285mPa.s. The foam inhibitor is polydimethylsiloxane, and the CAS number of polydimethylsiloxane is 9016-00-6. The alkali-resistant surfactant is silicone polyether, and the silicone polyether is allyl polyether, and the molecular weight of allyl polyether is 350.

[0032] The invention discloses a method for preparing a slag wastewater defoamer prepared by compounding Tween 85 with low cloud point fatty alcohol polyether, comprising the following specific steps: uniformly mixing Tween 85, low cloud point fatty alcohol polyether, foam inhibitor and alkaline resistant surfactant to obtain the slag wastewater defoamer. Example 2

[0033] The difference between Example 2 and Example 1 is that the amount of Tween 85 used in the slag wastewater defoamer raw material is 20g, the amount of low cloud point fatty alcohol polyether used is 75g, the amount of foam inhibitor used is 1g, and the amount of alkali-resistant surfactant used is 10g. Example 3

[0034] The difference between Example 3 and Example 1 is that the amount of Tween 85 used in the slag wastewater defoamer raw material is 10g, the amount of low cloud point fatty alcohol polyether used is 80g, the amount of foam inhibitor used is 5g, and the amount of alkali-resistant surfactant used is 20g. Example 4

[0035] The difference between Example 4 and Example 1 is that the low cloud point fatty alcohol polyether in the raw material of the slag wastewater defoamer is eicosanol polyoxyethylene ether polyoxypropylene ether, with a cloud point of 10° C., a molecular weight of 2500, and a viscosity of 348 mPa.s. Example 5

[0036] The difference between Example 5 and Example 1 is that the low cloud point fatty alcohol polyether in the raw material of the slag wastewater defoamer is behenyl alcohol polyoxyethylene ether polyoxypropylene ether, with a cloud point of 10°C, a molecular weight of 2500, and a viscosity of 318 mPa.s. Example 6

[0037] The difference between Example 6 and Example 1 is that the low cloud point fatty alcohol polyether in the raw material of the slag wastewater defoamer is hexadecyl / octadecyl alcohol polyoxyethylene ether polyoxypropylene ether, with a cloud point of 12° C., a molecular weight of 2000, and a viscosity of 287 mPa.s. Example 7

[0038] The difference between Example 7 and Example 1 is that the low cloud point fatty alcohol polyether in the raw material of the slag wastewater defoamer is octadecyl alcohol polyoxyethylene ether polyoxypropylene ether, with a cloud point of 12° C., a molecular weight of 2500, and a viscosity of 382 mPa.s. Example 8

[0039] The difference between Example 8 and Example 1 is that the low cloud point fatty alcohol polyether in the raw material of the slag wastewater defoamer is octadecyl alcohol polyoxyethylene ether polyoxypropylene ether, with a cloud point of 15° C., a molecular weight of 2000, and a viscosity of 362 mPa.s. Example 9

[0040] The difference between Example 9 and Example 1 is that the low cloud point fatty alcohol polyether in the raw material of the slag wastewater defoamer is hexadecanoic acid polyoxypropylene ether, wherein the hexadecanoic acid polyoxypropylene ether has a cloud point of 8° C., a molecular weight of 2000, and a viscosity of 256 mPa.s. Example 10

[0041] The difference between Example 10 and Example 9 is that the organosilicon polyether in the raw material of the slag wastewater defoamer comes from Preparation Example 1. Embodiment 11

[0042] The difference between Example 11 and Example 10 is that the organosilicon polyether in the raw material of the slag wastewater defoamer comes from Preparation Example 2. Example 12

[0043] The difference between Example 12 and Example 11 is that the organosilicon polyether in the raw material of the slag wastewater defoamer comes from Preparation Example 3. Embodiment 13

[0044] The difference between Example 13 and Example 11 is that the organosilicon polyether in the raw material of the slag wastewater defoamer comes from Preparation Example 4. Embodiment 14

[0045] The difference between Example 14 and Example 11 is that the organosilicon polyether in the raw material of the slag wastewater defoamer comes from Preparation Example 5.

[0046] Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that an equal amount of polyoxypropylene ether is used in the raw material of the slag wastewater defoamer instead of the low cloud point fatty alcohol polyether.

[0047] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that low cloud point fatty alcohol polyether is not used in the raw material of the slag wastewater defoamer.

[0048] The following performance tests were conducted on the slag wastewater defoamer prepared by compounding Tween 85 and low cloud point fatty alcohol polyether according to Examples 1-14 and Comparative Examples 1-2 of the present application. The specific test results are shown in Table 1.

[0049] 1. Defoaming and antifoaming performance Defoaming performance: 100 ml of slag wastewater foaming liquid was placed in a 250 ml measuring cylinder as a sample, the temperature of the foaming liquid was controlled to be 15 and 35 ° C, respectively, N2 was introduced through the pipe, and the flow rate was adjusted to about 3 L / min for bubbling. When the foam height reached 250 mL, 5 μL of the slag wastewater defoaming agent prepared in this application was added, and then the liquid level reaching the lowest point was recorded. The lower the height, the better the defoaming.

[0050] Anti-foaming performance: 100 ml of slag wastewater foaming liquid was placed in a 250 ml measuring cylinder as a sample, the temperature of the foaming liquid was controlled at 15 and 35 ° C, respectively, 5 μL of the slag wastewater defoaming agent prepared in this application was added, nitrogen was passed through the pipe, and the flow rate was adjusted to about 3 L / min for bubbling, and then the time taken for foam to appear was quickly recorded with a stopwatch. This time was recorded as the anti-foaming time.

[0051] Table 1: Performance test results data table

[0052] It can be seen from the performance test results that the slag wastewater defoamer prepared in this application has good defoaming effect and alkali resistance. The low cloud point fatty alcohol polyether with a mixture of hexadecyl alcohol, octadecyl alcohol, eicosanol and docosanol as initiators is combined with Tween 85, and maintains good defoaming stability under high alkali, is not easy to decompose and fail, and can continuously and effectively eliminate foam and inhibit the formation of foam in slag wastewater. Adding an appropriate amount of foam inhibitor to the raw material of the slag wastewater defoamer, it can be seen from the performance test results that the defoaming effect of the defoamer is durable and the formation of foam is continuously inhibited, so that the defoamer has both good defoaming and defoaming effects. Adding an appropriate amount of alkali-resistant surfactant to the raw material of the slag wastewater defoamer, it can be seen from the performance test results that the defoaming performance and defoaming performance of the defoamer in a high alkali environment are significantly improved.

[0053] Among them, the organosilicon polyether used in Examples 10-14 has a more obvious effect on improving the defoaming and anti-foaming performance of the defoamer. This further illustrates that using methyl-terminated allyl polyether instead of conventional allyl polyether can reduce the decomposition of polyether surfactants and improve the durability and stability of the defoaming and anti-foaming performance of the defoamer.

[0054] At the same time, by comparing Examples 13 and 14 with Examples 10-12, it can be seen that the hydrogen content of the hydrogen-containing silicone oil will also affect the polyether surfactant. Adjusting the hydrogen content of the hydrogen-containing silicone oil within a suitable range can increase the grafting effect of the hydrogen-containing silicone oil and the methyl-terminated allyl polyether, thereby promoting the defoaming agent to have better anti-foaming performance.

[0055] By comparing Comparative Examples 1-2 with Example 1, it can be seen that the use of fatty alcohol polyethers with higher cloud points has poor defoaming and foam suppression effects in the treatment of slag wastewater, and foam is repeatedly generated. Comparative Example 2 does not use low cloud point fatty alcohol polyethers. From the performance test results, it can be seen that the defoaming effect of the defoamer in slag wastewater is poor, and the defoaming and foam suppression abilities are both low, which further illustrates that the defoaming ability of traditional single-component defoamers is limited and cannot adapt to the high-alkali and high-cloud point wastewater treatment environment.

[0056] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed. However, as long as it is within the scope of the claims of the present application, it shall be protected by the patent law.

Claims

1. A slag wastewater defoamer prepared by compounding Tween 85 with low cloud point fatty alcohol polyether, characterized in that: The invention comprises the following raw materials in parts by weight: 10-30 parts of Tween 85, 20-80 parts of low-cloud point fatty alcohol polyether, 1-5 parts of foam inhibitor and 10-20 parts of alkali-resistant surfactant.

2. The slag wastewater defoamer prepared by compounding Tween 85 and low cloud point fatty alcohol polyether according to claim 1, characterized in that: The low cloud point fatty alcohol polyether is at least one of polyoxyethylene polyoxypropylene ethers with a mixture of 16-18 alcohol, 18 alcohol, 19 alcohol, and 12 alcohol as initiators; the cloud point of the low cloud point fatty alcohol polyether is less than 15°C.

3. The slag wastewater defoamer prepared by compounding Tween 85 and low cloud point fatty alcohol polyether according to claim 1, characterized in that: The foam inhibitor is polydimethylsiloxane.

4. The slag wastewater defoamer prepared by compounding Tween 85 and low cloud point fatty alcohol polyether according to claim 1, characterized in that: The alkali-resistant surfactant is silicone polyether.

5. The slag wastewater defoamer prepared by compounding Tween 85 and low cloud point fatty alcohol polyether according to claim 4, characterized in that: The organosilicon polyether comprises the following raw materials in parts by weight: 50-80 parts of methyl-terminated allyl polyether, 20-50 parts of hydrogen-containing silicone oil, and 0.01-0.03 parts of chloroplatinic acid catalyst.

6. The slag wastewater defoamer prepared by compounding Tween 85 and low cloud point fatty alcohol polyether according to claim 5, characterized in that: The molecular weight of the methyl terminated allyl polyether is 300-2000.

7. The slag wastewater defoamer prepared by compounding Tween 85 and low cloud point fatty alcohol polyether according to claim 5, characterized in that: The mass fraction of active hydrogen in the hydrogen-containing silicone oil is 0.18-0.36%.

8. The slag wastewater defoamer prepared by compounding Tween 85 with low cloud point fatty alcohol polyether according to claim 5, characterized in that: The preparation method of the organosilicon polyether comprises the following specific steps: mixing hydrogen-containing silicone oil with methyl-terminated allyl polyether, stirring evenly, heating to 80-110° C., vacuum dehydration, cooling to below 50° C., adding a catalyst, reacting at 80-120° C. until transparent, keeping the temperature for reaction for 0.5-2 h, and cooling to obtain the organosilicon polyether.

9. A method for preparing a slag wastewater defoamer prepared by compounding Tween 85 and low cloud point fatty alcohol polyether as claimed in any one of claims 1 to 8, characterized in that: The method comprises the following specific steps: uniformly mixing Tween 85, low-cloud point fatty alcohol polyether, foam inhibitor and alkali-resistant surfactant to obtain a slag wastewater defoamer.

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