【文章內(nèi)容簡介】 效綠色催化劑，主要由有機陽離子和無機離子構成，在室溫或室溫附近呈液態(tài)的鹽類化合物 ,具有不可揮發(fā)等較高的穩(wěn)定性，已被成功應用于有機合成等各項領域 [14]。 將吡啶與 濃硫酸 按 1:1 的比例混合均勻 , 放入燒瓶中 , 常溫下 在 磁力攪拌器 上攪拌 加熱 , 熔融大約 3 小時， 直至得到無色清亮液體即可 , 停止加熱 , 然后在真空干燥箱里 70 ℃ 干燥 24 h, 取出后冷卻 , 放在干燥器中備用 。 合成的吡啶濃硫酸離子液體在室溫下為液體，易溶于強極性溶劑，如水、乙醇等；不溶于弱極性溶劑，如乙醚、甲苯等 [15]。 氣相檢測注意事項 本次氣相色譜檢測的進樣方法采用的是手動進樣，使用微量注射器進行手動進樣時，操作的數(shù)量程度取決于精密度，各項操作應盡量一致。要注意以下幾點：選用恰當?shù)淖⑸淦鳎Ｓ玫氖?10ul 微量注射器，進樣量不能小于 1uL； 注射速度必須要快，注射速度過慢會 延長樣品的氣化過程，導致樣品進入色譜柱的初始譜帶變寬；避免樣品之間相互干擾， 取樣之前要用樣品溶劑洗針不少于 3 次，再用樣品溶液洗針不少于 3 次，這樣基本上能夠消除樣品間的相互干擾； 減少注射歧視，不管注射速度多快，不同組分沸點不同，汽化速度也會不同，從而造成定量分析的誤差，所以取樣前先將注射針插入汽化室預熱一定時間，或者取樣前先在注射器中抽取一定量的溶劑。 正確的注射方法應當是：取樣后，一只手拿 注射器，并把食指放在針芯的束端(以防汽化室的高氣壓把針芯吹出 )，同時另一只手要保護針尖 (防止插入時受到隔墊阻擋彎曲 )， 小心地將注射針頭插入隔墊 ，此 時要以最快的速度將注射器插到底，與此同時迅速地將樣品注射入汽化室 (注意不要彎曲針芯 )，最后快速拔除掉注射器。注射樣品時所需的時間以及注射器在汽化室中停留的時間越短越好，而且每次注射的過程越重現(xiàn)越好。 分析完畢，待組分流出后，先關閉氫氣和空氣，再進行降溫操作。將進樣口、柱溫箱、檢測器以及頂空進樣器的溫度均設為 40℃ ，待各組件的溫度不高于 40℃ 以后，依次關閉載氣，工作站和氣相色譜儀。如果要取下色譜柱，則取下后柱兩端應用盲堵堵上并放在盒內(nèi)，妥善保存。 收率的計算公式 收率 =M實際 /M理 論 *100% M理論 =M苯甲酸 /122*136 離子液體催化合成苯甲酸甲酯的研究 10 致謝 隨著 論文完成，四年的大學生活 也 即將結(jié)束，感慨萬千！從 選題的 開始到論文的順利完成，老師、同學、朋友們 不管是在學習上還是生活中 都給了我 數(shù)不盡的 幫助，在這里 ， 請接受我 發(fā)自內(nèi)心 的謝意！ 感謝我的導師 賈鵬飛和王娟老師 。從課題選擇、開題，到進行實驗、論文寫作 、整理 的 整個 過程， 賈 老師 和王老師 都傾注了大量的心血，給了我很多受用終生的指導。在這里我要再次向我的老師 們 表示深深的敬意和感謝！ 感謝我的輔導員韓老師，他為我們 的 日常課程和學習盡心盡力，為我們組織考研、 論 文寫作、 工作，再辛苦也無怨言。感謝各位校領導和化工學院的老師們，是你們讓學校充滿治學之風，使我們能夠更好的學習知識和完成學業(yè)！也要感謝 2022級制藥工程專業(yè)的同學們，他們在生活和學習上給了我很多幫助和關 懷 。更要感謝我的父親、母親，感謝他們對我的養(yǎng)育、教誨和支持。 最后，請允許我再次說一聲，謝謝大家！ 離子液體催化合成苯甲酸甲酯的研究 2 您好，為你提供優(yōu)秀的畢業(yè)論文參考資料，請您刪除以下內(nèi)容， O(∩ _∩ )O 謝謝?。?！ A large group of tea merchants on camels and horses from Northwest China39。s Shaanxi province pass through a stop on the ancient Silk Road, Gansu39。s Zhangye city during their journey to Kazakhstan, May 5, 2022. The caravan, consisting of more than 100 camels, three horsedrawn carriages and four support vehicles, started the trip from Jingyang county in Shaanxi on Sept 19, 2022. It will pass through Gansu province and Xinjiang Uygur autonomous region, and finally arrive in Almaty, formerly known as AlmaAta, the largest city in Kazakhstan, and Dungan in Zhambyl province. The trip will cover about 15,000 kilometers and take the caravan more than one year to plete. The caravan is expected to return to Jingyang in March 2022. Then they will e back, carrying specialty products from Kazakhstan A small art troupe founded six decades ago has grown into a household name in the Inner Mongolia autonomous region. In the 1950s, Ulan Muqir Art Troupe was created by nine young musicians, who toured remote villages on horses and performed traditional Mongolian music and dances for nomadic families. The 54yearold was born in Tongliao, in eastern Inner Mongolia and joined the troupe in says there are 74 branch troupes across Inner Mongolia and actors give around 100 shows every year to local nomadic people. I can still recall the days when I toured with the troupe in the early 39。80s. We sat on the back of pickup trucks for hours. The sky was blue, and we couldn39。t help but sing the folk songs, Nasun says. The vastness of Inner Mongolia and the lack of entertainment options for people living there, made their lives lonely. The nomadic people were very excited about our visits, Nasun recalls. We didn39。t have a formal stage. The audience just sat on the grass. Usually, the performances became a big party with local people joining in. For him, the rewarding part about touring isn39。t just about sharing art with nomadic families but also about gaining inspiration for the music and dance. Ulan Muqir literally translates as red burgeon, and today39。s performers of the troupe still tour the region39。s villages and entertain nomadic families, but their fame has spread around the world. On May 16 and 17, nearly 100 singers and dancers from the troupe performed at Beijing39。s Poly Theater. Their show, titled Ulan Muqir on the Grassland, depicted the history and development of the art troupe. Being from the region allowed me to embrace the culture of Inner Mongolia and being a member of the troupe showed me where I belonged, Nasun, the art troupe39。s president, who is also a renowned tenor, tells China Daily. During a tour in 1985, he went to a village and met an elderly local man, who told him a story about his friendship with a solider from Shenyang, capital of Northeast China39。s Liaoning province, decades ago. The solider gave the old man a handmade saddle when they bid farewell. The story inspired Nasun to write Carved Saddle, a song that later became one of his most popular numbers. Now, every year, Nasun recruits young singers and dancers for the troupe. The troupe has a