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href="http://www.cdcfah.com/cp/third-sysqm_qtsysyp/">其他實(shí)驗(yàn)室用品</a>?徐州2-甲基四氫呋喃生產(chǎn)工藝上海蔚云化工供應(yīng)</p><div id="ynkhgih" class="leftbox clearfix"><h1>徐州2-甲基四氫呋喃生產(chǎn)工藝上海蔚云化工供應(yīng)</h1><div id="kubdfw8" class="proBig"><div id="7prho7d" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624124322657/6802327.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="8833w8u" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624124322657/6802327.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="bv24pon" 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>徐州2-甲基四氫呋喃生產(chǎn)工藝,2-甲基四氫呋喃</p><p><span>***更新：</span>2020-12-03 03:20:15</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="8tfh2d3" 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(jī): </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(dāng)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="piacu7s" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="dr2fryk" class="box"><p><p style="text-indent:25px">PTMEA至PTMEG轉(zhuǎn)化的結(jié)果是聚合物料中留下了催化劑甲醇鈉(NaOMe)。要去除催化劑，首先用20%硫酸鎂水溶液與PTMEG中的甲醇鈉中和，反應(yīng)生成氫氧化鎂和硫酸鈉鹽，然后PTMEG 產(chǎn)品物料通過兩級干燥過程將其中所有的氫氧化鎂和硫酸鈉鹽結(jié)晶析出。干燥脫水后的PTMEG 連同結(jié)晶顆粒一起被通過“板框式”壓濾機(jī)過濾系統(tǒng)，以去除其中的固體結(jié)晶顆粒。窄化處理工藝過程部分提供了對PTMEG 的之后凈化，并通過去除產(chǎn)品中的低分子量聚合物，對聚合物產(chǎn)品的分子量（MW）分布進(jìn)行之后的窄化調(diào)整。這是通過兩級工藝過程實(shí)現(xiàn)的。經(jīng)初級工藝過程的“真空脫氣”后除去水、氮?dú)獾炔荒龤?，聚合物產(chǎn)品被輸送到短程蒸餾來完成之后一級工藝過程，在此過程中，徐州2-甲基四氫呋喃生產(chǎn)工藝，低分子聚合被脫除，徐州2-甲基四氫呋喃生產(chǎn)工藝。脫氣和短程蒸餾都備有冷阱用來凝聚低分子量聚合物，徐州2-甲基四氫呋喃生產(chǎn)工藝。聚四亞甲基醚二醇，又稱聚四氫呋喃。徐州2-甲基四氫呋喃生產(chǎn)工藝</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="徐州2-甲基四氫呋喃生產(chǎn)工藝,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624124322657/6802327.png"></div><p style="text-indent:25px">甲基，化學(xué)式為-CH?，由碳和氫元素組成。甲烷分子中去掉一個氫原子后剩下的電中性的一價基團(tuán)。甲基作為一個化學(xué)基團(tuán)，它能夠結(jié)合在DNA上某些特定部位，這個甲基和DNA結(jié)合過程叫甲基化，相反，從化合物上脫落的過程叫去甲基化。甲基常出現(xiàn)在各種有機(jī)化合物中,是較常見的基團(tuán)。由于甲基是合成蛋氨酸、肉堿、肌酸、磷脂、腎上腺素，核糖核酸和脫氧核糖核酸等具有主要生理作用的物質(zhì)所必需的基團(tuán)，以及甲基化反應(yīng)在神經(jīng)系統(tǒng)、免疫系統(tǒng)、泌尿系統(tǒng)和心血管系統(tǒng)中所起的作用，人們認(rèn)為生長期動物和成年動物都需要穩(wěn)定的甲基供體。一般認(rèn)為動物體內(nèi)自身不能合成甲基，需要食物中具有富含甲基物質(zhì)，它們的分子中具有易反應(yīng)的甲基，從而參與動物生理功能，這類富含甲基的物質(zhì)稱為“甲基供體”,易參與此反應(yīng)的甲基,是與氮原子或硫原子連在一起的甲基，象甜菜堿、蛋氨酸、膽堿等。杭州2-甲基四氫呋喃四氫呋喃具有低毒、低沸點(diǎn)、流動性好等特點(diǎn)。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="徐州2-甲基四氫呋喃生產(chǎn)工藝,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624016490617/6540095.png"></div><p style="text-indent:25px">甲基由一個化合物轉(zhuǎn)移到另一化合物上的酶反應(yīng)：A+B-CH3→A-CH3+B。由于N5、N10-亞甲四氫葉酸的酶促還原作用生成N5-甲基四氫葉酸，由一種鈷胺酰胺酶的作用將甲基由N5-甲基四氫葉酸轉(zhuǎn)移到同型半胱氨酸上而生成甲硫氨酸。甲硫氨酸由于ATP的作用變成S-腺苷酰甲硫氨酸，此化合物被用做甲基供體生成各種甲基化合物。作為膽堿氧化形式的甜菜堿等也起甲基供體作用。甲基轉(zhuǎn)移反應(yīng)不僅與含有甲基的膽堿、肌酸、腎上腺素等物質(zhì)的生成有關(guān)系，而且也與***、磷脂的變化、核酸及蛋白質(zhì)的甲基化也有關(guān)系，在生理上也是重要的。已知有數(shù)十種對各種化合物具特異的轉(zhuǎn)甲基酶。金屬汞和二價離子汞等無機(jī)汞在生物特別是微生物的作用下會轉(zhuǎn)化成甲基汞和二甲基汞，這種轉(zhuǎn)化稱為生物甲基化作用。這種轉(zhuǎn)化的逆過程稱為生物反甲基化作用。這兩種作用構(gòu)成了微生物的汞循環(huán)</p><p style="text-indent:25px">包裝方法：小開口鋼桶；安瓿瓶外普通木箱；螺紋口玻璃瓶、鐵蓋壓口玻璃瓶、塑料瓶或金屬桶（罐）外普通木箱。監(jiān)測方法：工程控制：生產(chǎn)過程密閉，加強(qiáng)通風(fēng)。呼吸系統(tǒng)防護(hù)：空氣中濃度較高時，應(yīng)該佩戴防毒面具。眼睛防護(hù)：戴化學(xué)安全防護(hù)眼鏡。身體防護(hù)：穿防靜電工作服。手防護(hù)：戴防護(hù)手套。其他防護(hù)：工作現(xiàn)場嚴(yán)禁吸煙。工作后，淋浴更衣。保持良好的衛(wèi)生習(xí)慣。理化特性外觀與性狀：無色揮發(fā)性液體，有類似醚的氣味。粘性：溶解性：微溶于水，可混溶于多數(shù)有機(jī)溶劑。主要用途：用作合成藥物磷酸氯喹、磷酸伯氨喹等的原料，也可用作溶劑。穩(wěn)定性：在常溫常壓下穩(wěn)定禁配物：強(qiáng)氧化劑、潮濕空氣。避免接觸的條件：接觸空氣。聚合危害：不能出現(xiàn)。在制藥工業(yè)中可合成抗痔藥磷酸伯氨奎、磷酸氯喹等。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="徐州2-甲基四氫呋喃生產(chǎn)工藝,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(jìn)入內(nèi)裝鎳催化劑的反應(yīng)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(yīng)產(chǎn)物與原料氫氣冷卻至50℃左右進(jìn)入洗滌塔底部，使未反應(yīng)的氫氣及氣態(tài)與液態(tài)產(chǎn)物分離，未反應(yīng)的氫氣及氣態(tài)產(chǎn)物經(jīng)洗滌后循環(huán)到反應(yīng)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(dá)99.9%，四氫呋喃選擇性為85%～95%，產(chǎn)品含量達(dá)99.97%。該工藝具有催化劑性能好、流程簡單、投資少等特點(diǎn)。4-丁二醇脫水環(huán)化法：其工藝過程為：向反應(yīng)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(yīng)器中排除約70kg焦質(zhì)。將焦質(zhì)進(jìn)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(dá)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(yīng)用較多的催化劑。此工藝技術(shù)成熟，工藝比較簡單，反應(yīng)溫度較低，四氫呋喃收率較高，但硫酸易腐蝕設(shè)備，污染環(huán)境。四氫呋喃是一個雜環(huán)有機(jī)化合物。衢州2-甲基四氫呋喃價格便宜嗎</p><p style="text-indent:25px">四氫呋喃是制藥行業(yè)的主要溶屬劑。徐州2-甲基四氫呋喃生產(chǎn)工藝</p><p style="text-indent:25px">呋喃是很好的富電芳香雜環(huán)，可與金屬形成金屬有機(jī)化合物參與反應(yīng)，可發(fā)生[2+2]光反應(yīng)、[2+3]環(huán)加成、[4+3]環(huán)加成和Diels-Alder反應(yīng)，也可以發(fā)生卡賓反應(yīng)。2-鹵代、?；⑶杌?、磺酰基和羰基呋喃的合成呋喃作為富電的芳香雜環(huán)可以與很多的親電試劑發(fā)生反應(yīng)，用以制備鹵代呋喃、?；秽?、氰代呋喃和其它雜原子取代呋喃等產(chǎn)物 (式1)。一般情況下C-2位比C-3位更容易受親電試劑的進(jìn)攻。烷基呋喃的合成烷基呋喃可由呋喃經(jīng)過親電取代反應(yīng)制得。呋喃發(fā)生Mannich反應(yīng)可生成2-(N,N-二烷基氨基)甲基呋喃衍生物，TMSI存在下呋喃也可以與β-酮發(fā)生反應(yīng)。而在Ag+催化下，1,3-二苯基硒丙烷 (式2) 或者氯代環(huán)丙烷可與呋喃發(fā)生烯丙基化。徐州2-甲基四氫呋喃生產(chǎn)工藝</p><p style="text-indent:25px">上海蔚云化工有限公司致力于化工，以科技創(chuàng)新實(shí)現(xiàn)***管理的追求。上海蔚云化工作為化工產(chǎn)品（除危險(xiǎn)化學(xué)品、監(jiān)控化學(xué)品、煙花爆竹、民用物品、易制毒化學(xué)品）、化工機(jī)械設(shè)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(wù)、技術(shù)咨詢。【依法須經(jīng)批準(zhǔn)的項(xiàng)目，經(jīng)相關(guān)部門批準(zhǔn)后方可開展經(jīng)營活動】的企業(yè)之一，為客戶提供良好的環(huán)戊酮，甲基異丙基酮，丙二胺，二甘醇胺。上海蔚云化工繼續(xù)堅(jiān)定不移地走高質(zhì)量發(fā)展道路，既要實(shí)現(xiàn)基本面穩(wěn)定增長，又要聚焦關(guān)鍵領(lǐng)域，實(shí)現(xiàn)轉(zhuǎn)型再突破。上海蔚云化工始終關(guān)注化工市場，以敏銳的市場洞察力，實(shí)現(xiàn)與客戶的成長共贏。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/2242697.html</p></div></div></div></div></div><div id="kt2cebt" class="page-right twoColRt"><div id="uovs2t9" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="7su3ogn" 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(qiáng) 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