本文關(guān)鍵詞： 地溝油 緩蝕劑 苯并咪唑啉 合成 緩蝕性能　出處：《廣東工業(yè)大學(xué)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：在我國(guó),每年至少產(chǎn)生300~500萬(wàn)噸地溝油,如果直接排放,不僅對(duì)環(huán)境造成嚴(yán)重污染,而且造成資源的浪費(fèi)。目前,一般處理是先將地溝油催化分解為高級(jí)脂肪酸和甘油,再經(jīng)過(guò)初加工成洗衣粉、生物柴油等初級(jí)產(chǎn)品,但產(chǎn)品的附加值都不高,因此,研究利用地溝油生產(chǎn)高附加值精細(xì)化工產(chǎn)品具有重要的經(jīng)濟(jì)效益和社會(huì)意義。本論文以地溝油為原料,利用酯氨解-環(huán)化脫水反應(yīng),使其與鄰苯二胺及其衍生物反應(yīng),合成了3種混合脂肪基苯并咪唑啉類(lèi)緩蝕劑:即2-混合脂肪基苯并咪唑啉(MFBI)、1-甲基-2-混合脂肪基苯并咪唑啉(MMFBI)及5-硝基-2-混合脂肪基苯并咪唑啉(NMFBI)。通過(guò)IR譜圖對(duì)三種產(chǎn)物的官能團(tuán)結(jié)構(gòu)進(jìn)行了表征;采用掛片失重法和電化學(xué)極化曲線法,研究了三種產(chǎn)物在鹽酸體系中對(duì)Q235和N80鋼的緩蝕性能,并與市售咪唑啉緩蝕劑進(jìn)行了對(duì)比試驗(yàn)。利用掃描電子顯微鏡(SEM)對(duì)N80鋼腐蝕表面的微觀形貌進(jìn)行觀測(cè)和對(duì)比;并進(jìn)行了緩蝕劑在金屬表面上吸附動(dòng)力學(xué)和熱力學(xué)研究,實(shí)驗(yàn)得出了如下結(jié)果:以地溝油為原料,與鄰苯二胺直接地進(jìn)行�；�-環(huán)化反應(yīng),合成了MFBI,以緩蝕率作為評(píng)價(jià)指標(biāo),采用正交設(shè)計(jì)實(shí)驗(yàn)法,優(yōu)化了MFBI合成工藝,實(shí)驗(yàn)得到的最佳合成工藝條件為:地溝油和鄰苯二胺的原料摩爾比為1:3.3,�；瘻囟葹�160℃,�；瘯r(shí)間為6h,環(huán)化時(shí)間為15h。按此改進(jìn)的合成工藝,使地溝油分別與N-甲基鄰苯二胺鹽酸鹽及4-硝基鄰苯二胺進(jìn)行了反應(yīng),分別制得MMFBI及NMFBI。通過(guò)IR光譜圖的解析,驗(yàn)證了三種化合物已成功被合成。靜態(tài)失重法研究結(jié)果表明,三種新型緩蝕劑在5%HCl介質(zhì)中對(duì)Q235和N80鋼均有良好的緩蝕作用,緩蝕率隨著緩蝕劑投加濃度增大而升高,隨溫度升高而下降;在30-70℃實(shí)驗(yàn)范圍內(nèi),MMFBI對(duì)N80鋼的緩蝕率維持在95%以上左右,且顯示出優(yōu)異的耐高溫性能。同樣的條件下,三種緩蝕劑對(duì)N80鋼的緩蝕能力順序依次為:MMFBIMFBINMFBI。對(duì)比試驗(yàn)結(jié)果表明,MMFBI緩蝕性能與市售咪唑啉緩蝕劑的相當(dāng)。電化學(xué)極化曲線實(shí)驗(yàn)結(jié)果表明,三種緩蝕劑在不同程度上抑制了陰陽(yáng)兩級(jí)反應(yīng),且MMFBI和MFBI屬于以抑制陰極為主的混合型緩蝕劑,而NMFBI是以抑制陽(yáng)極為主的混合型緩蝕劑。掃描電子顯微鏡(SEM)的圖像分析表明:三種緩蝕劑均可在N80鋼表面形成一層吸附保護(hù)膜,但NMFBI的成膜能力較差。緩蝕劑在金屬表面上吸附動(dòng)力學(xué)和熱力學(xué)研究表明,三種緩蝕劑在N80鋼表面的吸附規(guī)律均符合Langmuir吸附等溫式,且吸附過(guò)程是自發(fā)進(jìn)行的,包含物理和化學(xué)兩種吸附。吸附膜形成過(guò)程屬于放熱反應(yīng)。
[Abstract]:In China, at least 300 to 5 million tons of gutter oil is produced every year. If it is discharged directly, it will not only cause serious pollution to the environment, but also cause a waste of resources. At present, the general treatment is to decompose the gutter oil into high fatty acids and glycerol first. After initial processing into primary products such as laundry powder, biodiesel and so on, but the added value of the products is not high, therefore, It is of great economic and social significance to study the production of high value-added fine chemical products from gutter oil. In this paper, using gutter oil as raw material, esterification and cyclization dehydration reaction are used to make it react with o-phenylenediamine and its derivatives. Three kinds of mixed aliphatic benzimidazoline corrosion inhibitors, I. e., 2-mixed aliphatic benzimidazoline (MFBI) 1-methyl-2-aliphatic benzimidazoline (MMFBI) and 5-nitro-2-aliphatic benzimidazoline (NMFBII) were synthesized. The functional group structure of seed product was characterized. The corrosion inhibition properties of three products on Q235 and N80 steels in hydrochloric acid system were studied by means of plate weight loss and electrochemical polarization curves. The micromorphology of corrosion surface of N80 steel was observed and compared by scanning electron microscope (SEM), and the adsorption kinetics and thermodynamics of corrosion inhibitor on metal surface were studied. The experimental results are as follows: using gutter oil as raw material, direct acylation cyclization reaction with o-phenylenediamine was carried out to synthesize MFBI. The corrosion inhibition rate was used as the evaluation index and the orthogonal design experiment method was used to optimize the synthesis process of MFBI. The optimum synthetic conditions are as follows: molar ratio of waste oil to o-phenylenediamine is 1: 3.3, acylation temperature is 160 鈩，

本文編號(hào)：1546188