【正文】 DBE 有特殊的揮發(fā)性，隨著溫度的升高， DBE 的揮發(fā)速度比其它溶劑提高的更快，即在揮發(fā)過程的前半段 DBE 揮發(fā)慢，后部分揮發(fā)快，這樣允許更有利烘干過程，溶劑揮發(fā)更平均，有利于改善溜平、光澤，消除表面缺陷。 （ 5） 工業(yè)清洗劑 DBE 可有效的清除設(shè)備和工作區(qū)殘留部分固化漆。目前，也有以水合硫酸氫鈉、雜多酸、磷鎢酸等為催化劑，通過酯化反應(yīng)制備該化合物的報(bào)道。由于其含雜質(zhì)、水分多，顏色呈綠色或黃褐色，難以利用。但由于酯化反應(yīng)是一個平衡反應(yīng)，一旦反應(yīng)達(dá)到平衡，即使再延長反應(yīng)時間，也無法提高其轉(zhuǎn)化率。催化劑的濃度與使用壽命對反應(yīng)也有很大影響。 甲醇羰基化法醋酸 又名尼龍酸，是己二酸生產(chǎn)過程產(chǎn)生的副產(chǎn)物，僅國內(nèi)己二酸生產(chǎn)企業(yè)每年就副產(chǎn)混合二元酸 4060 萬噸。實(shí)驗(yàn)中考查了各種反應(yīng)的影響因素，并利用制備的混合二甲酸二甲酯與異辛醇進(jìn)行酯交換制備混合二元酸二異辛酯。反應(yīng)時間對酯化反應(yīng)收率和殘?jiān)实挠绊?，在相同條件下，隨著反應(yīng)時間的增加，混合二元酸二甲酯的收率也逐漸增加，殘?jiān)手饾u降低。單次酯化，混合二元酸二甲酯收率最高為 80％。 為了物盡其用， 本文 開展了應(yīng)用基礎(chǔ) 研究 以 C4C6 混合二元酸為原料、對甲苯磺酸為催化劑，制備混合二元酸二甲酯，并利用減壓精餾得到純凈的二甲酯。由于其含雜質(zhì)、水分多，顏色呈綠色或黃褐色，難以利用。由于其含雜質(zhì)、水分多，顏色呈綠色或黃褐色，難以利用。 遼寧石油化工 大學(xué)本科生畢業(yè)論文 13 遼寧石油化工 大學(xué)本科生畢業(yè)論文 14 參考文獻(xiàn) [1] 鄧劍如，單婷婷，陳浪 ， 等 . 用混合二元酸制備混合酸二甲酯 [J]. 化工環(huán)保， 2021， 28（ 1） ：7476. [2] Shen Guoliang. 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The picturesque Arxan in Autumn is indeed a fairyland only exists in a dream that satisfies all your fantasies. If it rains heavily on Saturday night, some elderly Chinese will say it is because Zhinu, or the Weaving Maid, is 遼寧石油化工 大學(xué)本科生畢業(yè)論文 17 crying on the day she met her husband Niulang, or the Cowherd, on the Milky Way. Most Chinese remember being told this romantic tragedy when they were children on Qixi, or the Seventh Night Festival, which falls on the seventh day of the seventh lunar month, which is usually in early August. This year it falls on Saturday, August 2. Folklore Story As the story goes, once there was a cowherd, Niulang, who lived with his elder brother and sisterinlaw. But she disliked and abused him, and the boy was forced to leave home with only an old cow for pany. The cow, however, was a former god who had violated imperial rules and was sent to earth in bovine form. One day the cow led Niulang to a lake where fairies took a bath on earth. Among them was Zhinu, the most beautiful fairy and a skilled seamstress. The two fell in love at first sight and were soon married. They had a son and daughter and their happy life was held up as an example for hundreds of years in China. Yet in the eyes of the Jade Emperor, the Supreme Deity in Taoism, marriage between a mortal and fairy was strictly forbidden. He ordered the heaven troop to catch Zhinu back. Niulang grew desperate when he discovered Zhinu had been taken back to heaven. Driven by Niulang39。s Day. More and more young Chinese people begin to celebrate this day in a very similar way as that in western countries. Fewer people than ever will gaze at the heavens on Saturday to pick out the two stars shining bright on either side of the Milky Way, that is, if people even know on which day Qixi falls. There are ready reminders dotted about, in the form of big ads saying Sales on Chinese Valentine39。 Festival. In this day, girls will throw a sewing needle into a bowl full of water on the night of Qixi as a test of embroidery skills. If the needle floats on top of the water instead of sinking, it proves the girl is a skilled embroiders. Single women also pray for finding a good husband in the future. And the newly married women pray to bee pregnant quickly. Tradition transformed The love story of Niulang and Zhinu, and the Qixi Festival have been handed down for generations. Yet these ancient traditions and customs are slowly dying out. Many modern Chinese, particularly youngsters, seem to know more about St Valentine39。 ll wait in the line for one hour to get a ticket, and another two hours at the site, to only see a tiny bit of the place due to the crowds. Last year, 428 million tourists traveled in China over the weeklong holiday in October. Traveling during this period is a matter that needs thorough preparation. If you are short on time to plan the