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href="http://www.cdcfah.com/cp/second-_sysqm/">實驗室器皿</a>?<a href="http://www.cdcfah.com/cp/third-sysqm_qtsysyp/">其他實驗室用品</a>?江西2-甲基四氫呋喃行業(yè)前景上海蔚云化工供應</p><div id="k8arofm" class="leftbox clearfix"><h1>江西2-甲基四氫呋喃行業(yè)前景上海蔚云化工供應</h1><div id="y9acew2" class="proBig"><div id="r9nprya" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/shweiyun/637389623894254288/5270430.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="ie7krd7" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/shweiyun/637389623894254288/5270430.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="3irjaxe" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價格要求：</span>面議</p><p><span>所在地：</span>上海市</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關(guān)鍵詞：</span>江西2-甲基四氫呋喃行業(yè)前景,2-甲基四氫呋喃</p><p><span>***更新：</span>2020-11-09 07:25:27</p><p><span id="click" >瀏覽次數(shù)：0次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="wc7npry" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">上海蔚云化工有限公司</a></p><p><span>聯(lián)系人：</span>盛志華</p><p><span>郵箱: </span>3273929241@qq.com</p><p><span>電話: </span>18721726651</p><p><span>傳真: </span>021_</p><p><span>網(wǎng)址: </span>http://www.weiyunhuagong.com</p><p><span>手機: </span>021-52909928</p><p><span>地址: </span>靜安區(qū)靈石路709號55幢A2113室</p><p>[當前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="rcli8iy" class="page-proshow02"><p class="title">詳細說明</p><div id="2nprqht" class="box"><p><p style="text-indent:25px">5-二取代的四氫呋喃類混合物的制備方法，江西2-甲基四氫呋喃行業(yè)前景，包括：在多相醚化催化劑、多相氫化催化劑和氫氣存在的條件下，將5-羥甲基糠醛或5-羥甲基糠醛的水溶液與醇混合后發(fā)生醚化還原反應得到的液態(tài)中間產(chǎn)物；然后再在第二催化劑的作用下，使得到的液態(tài)中間產(chǎn)物發(fā)生加氫反應，得到2，5-二取代的四氫呋喃類混合物。該制備方法通過兩步法實現(xiàn)5-羥甲基糠醛向目標產(chǎn)物的轉(zhuǎn)化，得到的2，5-二取代的四氫呋喃類混合物可作為潛在的燃料或者燃料添加劑，江西2-甲基四氫呋喃行業(yè)前景。含有四氫呋喃的藥物共有13個。這些藥物涵蓋心血管疾病，傳染病，泌尿系統(tǒng)疾病，ai癥和糖尿病等多種***領(lǐng)域。這些藥物中的四氫呋喃都含有手性中心，其中特拉唑嗪和阿夫唑嗪為外消旋體。另外，有4種藥物含有兩個四氫呋喃環(huán)，包括地瑞那韋、異山梨醇二硝酸酯、異山梨醇單硝酸酯，江西2-甲基四氫呋喃行業(yè)前景。天然產(chǎn)物包括伊維菌素、依前列醇及軟海綿素B的合成類似物艾日布林。泊沙康唑含有一個季碳手性中心，其抗***效果優(yōu)于早期的酮康唑等抗***藥，它對曲霉菌以及對先前的抗***藥具有抗性的其它******均有效。聚四氫呋喃主要用作嵌段聚氨酯或嵌段聚醚聚酯的軟鏈段。江西2-甲基四氫呋喃行業(yè)前景</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="江西2-甲基四氫呋喃行業(yè)前景,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389623894254288/5270430.png"></div><p style="text-indent:25px">甲基化作用可在需氧或厭氧條件下進行，其轉(zhuǎn)化機理主要有酶促反應和非酶促反應兩種。非酶促反應機理依據(jù)厭氧菌甲烷形成菌合成的甲基鈷氨素作為甲基供體,在有三磷酸腺苷(ATP)和中等還原劑的條件下把無機汞轉(zhuǎn)化成甲基汞或二甲基汞，與此同時甲基鈷氨素轉(zhuǎn)化成羥基鈷氨素。甲基化的酶促反應是由微生物直接參與進行的。細菌利用培養(yǎng)基中豐富的維生素，在細胞內(nèi)產(chǎn)生轉(zhuǎn)甲基酶，促使甲基轉(zhuǎn)移，但酶的種類還不清楚。從底泥、土壤和魚的內(nèi)臟、魚鰓中發(fā)現(xiàn)，能使汞甲基化的微生物種類很多，厭氧菌中有匙形梭狀芽孢桿菌,需氧菌中有熒光極毛桿菌草分枝桿菌大腸桿菌等甲基化速度取決于酶的活性，并與營養(yǎng)環(huán)境以及半胱氨酸和維生素B等因素有關(guān)。厭氧條件下硫化物的存在往往會控制汞甲基化的進行。舟山2-甲基四氫呋喃批發(fā)便宜嗎2-甲基四氫呋喃含量低,容易處理。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="江西2-甲基四氫呋喃行業(yè)前景,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624039166387/6007011.png"></div><p style="text-indent:25px">試劑和儀器，試劑：所用試劑均為分析純試劑；儀器：循環(huán)水泵、電動攪拌器、旋轉(zhuǎn)蒸發(fā)儀、反應精餾裝置、GC-2010 Plus氣相色譜儀，GCMS-QP 2010 SE氣質(zhì)聯(lián)用儀。固體酸催化劑的制備，在三口燒瓶上裝上高速攪拌器、溫度計，加入一定量飽和氯化鈉水溶液，加入明膠、聚乙烯醇作為分散劑。開啟攪拌，分散劑均勻分散后，稱量摩爾比為5:1的鄰氯苯乙烯和二乙烯基苯，再取定量液體石臘作為致孔劑和過氧化苯甲酰作為引發(fā)劑加入反應器中，升溫開始反應，75℃保持12小時。反應中監(jiān)控油珠分散情況，隨時調(diào)整攪拌速度以控制油珠分散度和顆粒大小。反應結(jié)束后緩慢冷卻、過濾，以熱水洗滌并烘干。用石油醚萃取致孔劑，篩分出直徑0.5~0.7mm的樹脂骨架，以二氯乙烷溶脹。溶脹完成后，在良好攪拌下加入定量濃硫酸，升溫回流并保持5小時。蒸出二氯乙烷，加入定量發(fā)煙硫酸，升溫至110℃反應。反應過程中定時取樣，測定樹脂交換量，達到預定值后結(jié)束反應，降溫。以蒸餾水小心的洗滌樹脂至洗液中性，自然晾干。</p><p style="text-indent:25px">2-甲基四氫呋喃是一種有機化合物，分子式是C5H10O。外觀與性狀：透明,無色液體，密度：0.86 g/mL at 25 °C。熔點：-136 °C 凝固點：-136℃。沸點：78-80 °C，折射率：n** 1.406。儲存條件：庫房通風低溫干燥,與氧化劑、酸類分開存放。由2-甲基呋喃催化加氫而得。當催化加氫反應采用氯化鈀催化劑時,主要的產(chǎn)品是乙酰丙醇(見00420),但也可回收得到副產(chǎn)品2-甲基四氫呋喃。本品主要用作樹脂、橡膠、乙基纖維素等的溶劑；用它提取脂肪族酸類，要比一般所用的低沸點溶劑好，在鈾的冶煉工業(yè)上也相當重要。在制藥工業(yè)中可合成抗痔藥磷酸伯氨奎、磷酸氯喹等。2-甲基四氫呋喃是一種有機化合物，分子式是C5H10O。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="江西2-甲基四氫呋喃行業(yè)前景,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624283199578/5832986.png"></div><p style="text-indent:25px">順酐催化加氫法：順酐和氫氣從底部進入內(nèi)裝鎳催化劑的反應器，產(chǎn)物中四氫呋喃與γ-丁內(nèi)酯比例可通過調(diào)整操作參數(shù)加以控制。反應產(chǎn)物與原料氫氣冷卻至50℃左右進入洗滌塔底部，使未反應的氫氣及氣態(tài)與液態(tài)產(chǎn)物分離，未反應的氫氣及氣態(tài)產(chǎn)物經(jīng)洗滌后循環(huán)到反應器，液態(tài)產(chǎn)物經(jīng)蒸餾而得四氫呋喃產(chǎn)品。該工藝可在0～(5∶1)范圍內(nèi)任意調(diào)整γ-丁內(nèi)酯與四氫呋喃的比例，順酐的單程轉(zhuǎn)化率達99.9%，四氫呋喃選擇性為85%～95%，產(chǎn)品含量達99.97%。該工藝具有催化劑性能好、流程簡單、投資少等特點。4-丁二醇脫水環(huán)化法：其工藝過程為：向反應器中加入1087kg 22%的硫酸水溶液，在100℃以110kg/h的速度加入1，4-丁二醇，塔頂溫度維持在80℃，以大約110kg/h的速度從塔頂?shù)玫胶?0%四氫呋喃的水溶液。加入50t 1，4-丁二醇后，從反應器中排除約70kg焦質(zhì)。將焦質(zhì)進行過濾，得到的硫酸水溶液可以重新使用，這一過程的四氫呋喃收率可以達到99%以上。硫酸是四氫呋喃工業(yè)生產(chǎn)中使用較早的催化劑，也是現(xiàn)今生產(chǎn)中應用較多的催化劑。此工藝技術(shù)成熟，工藝比較簡單，反應溫度較低，四氫呋喃收率較高，但硫酸易腐蝕設備，污染環(huán)境。四氫呋喃又名一氧五環(huán)、氧雜環(huán)戊烷、四亞甲基氧。江西2-甲基四氫呋喃行業(yè)前景</p><p style="text-indent:25px">四氫呋喃與水能混溶。江西2-甲基四氫呋喃行業(yè)前景</p><p style="text-indent:25px">四氫呋喃的沸點比較低，將其調(diào)入汽油后使汽油的餾程溫度降低。這一性質(zhì)讓生產(chǎn)超高辛烷值汽油的煉油廠獲得了很大的經(jīng)濟效益。采用四氫呋喃作為反應溶劑，使反應產(chǎn)物和催化劑容易分離，使3-HPA的濃度提高到35%以上。采用水萃取3-HPA，使鈷催化劑的循環(huán)使用率達99.6%，通過控制羰基化反應中的水含量和3-HPA的濃度，使高沸點副產(chǎn)物很少，生成3-HPA選擇性大于90%，使該技術(shù)的工業(yè)化成為可能。產(chǎn)品運輸：運輸車輛應配備相應消防器材及泄漏應急處理設備。嚴禁與氧化劑、食用化學品等混裝混運。禁止使用易產(chǎn)生火花的機械設備和工具裝卸。夏季較好早晚運輸。運輸途中應防暴曬、雨淋，防高溫。中途停留時應遠離火種、熱源、高溫區(qū)。鐵路運輸時要禁止溜放。嚴禁用木船、水泥船散裝運輸。運輸工具上應根據(jù)相關(guān)運輸要求張貼危險標志、公告。江西2-甲基四氫呋喃行業(yè)前景</p><p style="text-indent:25px">上海蔚云化工有限公司擁有化工產(chǎn)品（除危險化學品、監(jiān)控化學品、煙花爆竹、民用物品、易制毒化學品）、化工機械設備及配件的銷售，在化工技術(shù)領(lǐng)域內(nèi)從事技術(shù)開發(fā)、技術(shù)轉(zhuǎn)讓、技術(shù)服務、技術(shù)咨詢。【依法須經(jīng)批準的項目，經(jīng)相關(guān)部門批準后方可開展經(jīng)營活動】等多項業(yè)務，主營業(yè)務涵蓋環(huán)戊酮，甲基異丙基酮，丙二胺，二甘醇胺。公司目前擁有較多的高技術(shù)人才，以不斷增強企業(yè)重點競爭力，加快企業(yè)技術(shù)創(chuàng)新，實現(xiàn)穩(wěn)健生產(chǎn)經(jīng)營。公司業(yè)務范圍主要包括：環(huán)戊酮，甲基異丙基酮，丙二胺，二甘醇胺等。公司奉行顧客至上、質(zhì)量為本的經(jīng)營宗旨，深受客戶好評。一直以來公司堅持以客戶為中心、環(huán)戊酮，甲基異丙基酮，丙二胺，二甘醇胺市場為導向，重信譽，保質(zhì)量，想客戶之所想，急用戶之所急，全力以赴滿足客戶的一切需要。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/1914942.html</p></div></div></div></div></div><div id="na2woqx" class="page-right twoColRt"><div id="xr97b4t" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="hgamykh" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img src="http://tyunfile.71360.com/UpLoadFile/2019/11/1/14/637082168864691056_lgpj_5374157.jpg" alt="福建ZF配件哪家強信息推薦自業(yè)物資供應" 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