發(fā)布時(shí)間：2018-06-29 02:43

  本文選題：有機(jī)硅消泡劑 + 聚醚改性有機(jī)硅��； 參考：《華北電力大學(xué)(北京)》2017年碩士論文

【摘要】：石灰石-石膏濕法脫硫系統(tǒng)是燃煤電站使用最為廣泛的煙氣脫硫系統(tǒng),其中吸收塔因?yàn)闈{液起泡而導(dǎo)致溢流是該系統(tǒng)運(yùn)行中最常見(jiàn)的問(wèn)題,解決這一問(wèn)題的最簡(jiǎn)單、有效的方法是向吸收塔中投加適量的消泡劑,加快泡沫的破除并抑制泡沫的產(chǎn)生。有機(jī)硅消泡劑和聚醚改性有機(jī)硅消泡劑具有優(yōu)異的消、抑泡性能,可以有效解決該問(wèn)題�；诖�,文本通過(guò)制備這兩種消泡劑,并對(duì)其進(jìn)行性能評(píng)價(jià),得到最優(yōu)配方及其制備方法。首先,本文以二甲基硅油、疏水氣相二氧化硅和甲基乙烯基MQ硅樹(shù)脂組成的硅膏為主要成分,Span60-Tween60為乳化劑,羥丙基甲基纖維素(HPMC)為增稠劑,經(jīng)乳化剪切后得到性能優(yōu)異的有機(jī)硅消泡劑,并通過(guò)實(shí)驗(yàn)得到消泡劑最優(yōu)配方:二甲基硅油(粘度為10Pa·s)為21wt%,疏水氣相二氧化硅與甲基乙烯基MQ硅樹(shù)脂均為1.4wt%,Span60-Tween60復(fù)合乳化劑(HLB值為10)為6.3wt%,HPMC為0.5wt%,在3000r/min條件下,剪切處理5min后出料�；谧顑�(yōu)條件下的有機(jī)硅消泡劑的消、抑泡性能優(yōu)于同類(lèi)商業(yè)電廠產(chǎn)品,同時(shí)具有較好離心、耐熱、耐低溫、稀釋穩(wěn)定性。同時(shí),為了進(jìn)一步提升消泡劑性能,研發(fā)了聚醚改性有機(jī)硅。以聚醚F-6和低含氫硅油為原料,在硅氫加成作用機(jī)理下,合成聚醚改性有機(jī)硅,其最優(yōu)制備條件:以0.16%含氫硅油和聚醚F-6為原料,Si-H鍵和C=C鍵摩爾比例為1:1.1,加入40μg/g催化劑,在130℃下,反應(yīng)4h,產(chǎn)品冷卻出料,其原料轉(zhuǎn)化率為89.4%,得到具有淡黃色,粘度適中的聚醚改性有機(jī)硅,并通過(guò)對(duì)產(chǎn)品的紅外譜圖分析確定了其結(jié)構(gòu)。最后,通過(guò)在機(jī)硅消泡劑中添加聚醚改性有機(jī)硅,得到了消、抑泡性能更加優(yōu)異的聚醚改性有機(jī)硅消泡劑,其聚醚改性有機(jī)硅的最優(yōu)含量為5%,同時(shí)聚醚改性有機(jī)硅可以作為一種助乳化劑,在制備消泡劑過(guò)程中,可以有效降低消泡劑主要成分乳化難度。對(duì)有機(jī)硅消泡劑、聚醚改性有機(jī)硅消泡劑不同質(zhì)量濃度的水溶液的表面張力進(jìn)行了研究,結(jié)果表明,有機(jī)硅消泡劑和聚醚改性有機(jī)硅消泡劑質(zhì)量濃度為1.0g/L時(shí)分別具有低的表面張力為27.6m N/m、22.6m N/m,聚醚改性有機(jī)硅消泡劑具有更低的表面張力,因此具有更好的消、抑泡性能。同時(shí),對(duì)有機(jī)硅消泡劑、聚醚改性有機(jī)硅消泡劑的消泡過(guò)程進(jìn)行了研究,總結(jié)歸納出兩種自制消泡劑的消泡機(jī)理。
[Abstract]:Limestone-gypsum wet desulfurization system is the most widely used flue gas desulfurization system in coal-fired power stations. The effective method is to add a proper amount of defoamer to the absorber to accelerate the foam breaking and to restrain the foam. Silicone defoamer and polyether modified silicone defoamer have excellent anti-foaming performance and can effectively solve this problem. Based on this, the optimal formulation and preparation method were obtained by preparing the two defoamers and evaluating their performance. Firstly, the silicone paste composed of dimethyl silicone oil, hydrophobic vapor silica and methyl vinyl MQ silicone resin was used as the main component, Span60-Tween60 as emulsifier, hydroxypropyl methyl cellulose (HPMC) as thickener, and hydroxy propyl methyl cellulose (HPMC) as thickener. Silicone defoamer with excellent properties was obtained by emulsifying and shearing. The optimum formulation of defoamer was obtained as follows: dimethyl silicone oil (viscosity 10 Pa s) was 21 weeks old, hydrophobic gas phase silica and methyl vinyl MQ silicone resin were 1.4 wtlong and Span60-Tween60 composite emulsifier (HLB = 10) was 6.3wttt. under 3000r/min condition, the 5min was produced after shearing. The antifoaming performance of silicone defoamer based on the optimum conditions is superior to that of the commercial power plants of the same kind, and it also has good centrifugal, heat resistance, low temperature resistance and dilution stability. In order to improve the performance of defoamer, polyether modified silicone was developed. Polyether modified organosilicon was synthesized from polyether F-6 and low-hydrogen-containing silicone oil under the mechanism of hydrosilylation. The optimum preparation conditions were as follows: the molar ratio of Si-H bond to Ca-C bond of 0.16% hydrogen-containing silicone oil and polyether F-6 was 11. 1%, and 40 渭 g / g catalyst was added. At 130 鈩，

本文編號(hào)：2080478