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02:14:48</p><p><span id="click" >瀏覽次數(shù)：2次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="lzqwno7" 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(hào)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="xk7cgsj" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="37a3wrt" class="box"><p><p style="text-indent:25px">丙烯酸四氫呋喃酯的合成量取100mL上述自制固體酸催化劑裝入反應(yīng)精餾裝置的反應(yīng)管中，催化劑床層上下方均裝填石英砂作為保溫、支撐層。取摩爾比1.2：1的丙烯酸和四氫糠醇，以兩倍質(zhì)量的甲苯稀釋，稀釋液中加入0.01%的對(duì)苯二酚作為阻聚劑，攪拌至對(duì)苯二酚完全溶解，徐州2-甲基四氫呋喃批發(fā)廠家，放置備用。設(shè)置反應(yīng)精餾裝置預(yù)熱器溫度85℃，設(shè)置催化劑床層上口溫度85℃，下口溫度110℃，設(shè)置體系壓力80KPa，徐州2-甲基四氫呋喃批發(fā)廠家，徐州2-甲基四氫呋喃批發(fā)廠家，將上述原料溶液以一定流速連續(xù)輸入到反應(yīng)器，經(jīng)預(yù)熱器預(yù)熱后到達(dá)反應(yīng)器頂部，自然流下在催化劑床層進(jìn)行酯化反應(yīng)。反應(yīng)中生成的水和溶劑甲苯形成共沸物從反應(yīng)器頂部抽出，冷凝后進(jìn)入分水器，甲苯回流入反應(yīng)器，水定期采出。反應(yīng)體系穩(wěn)定一小時(shí)后取樣分析，以GCMS-QP 2010 SE氣質(zhì)聯(lián)用儀進(jìn)行定性分析，GC-2010 Plus氣相色譜儀進(jìn)行定量分析。四氫糠醇轉(zhuǎn)化率99%，單酯選擇性97%。粗產(chǎn)品濃縮后，將殘留溶劑和過量丙烯酸蒸出后得到成品，為透明接近無色的液體，收率97%（以四氫糠醇計(jì)），酯含量99%，酸值0.2（mgKOH/g），水分0.05%，鉑鈷色號(hào)小于20，指標(biāo)均達(dá)到產(chǎn)品標(biāo)準(zhǔn)要求。甲基化作用可在需氧或厭氧條件下進(jìn)行。徐州2-甲基四氫呋喃批發(fā)廠家</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="徐州2-甲基四氫呋喃批發(fā)廠家,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624283199578/5832986.png"></div><p style="text-indent:25px">利用微生物還原汞的功能,可使金屬汞沉淀回收,揮發(fā)的汞可用活性炭吸附。微生物除汞方法主要有選育高效抗汞微生物處理含汞廢水：如應(yīng)用選育的高效抗汞菌，假單胞桿菌 K62可處理含甲基汞、乙基汞、**、乙酸汞、硫酸汞、氧化汞和**等廢水，金屬汞回收率達(dá)80%以上，菌體能重復(fù)用三次。采用除汞：依靠活性污泥中的抗汞菌將汞還原為金屬汞，活性污泥系統(tǒng)本身還可吸附汞。采用濾池法除汞：用馴化活性污泥掛膜處理生化需氧量 (BOD)低的含汞廢水。使用硫化氫沉淀汞：借助于其他微生物產(chǎn)生的硫化氫與水溶性汞結(jié)合成硫化汞，硫化汞溶度積很小，可以在沉淀后除去。嘉興2-甲基四氫呋喃廠家電話是多少甲基化的酶促反應(yīng)是由微生物直接參與進(jìn)行的。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="徐州2-甲基四氫呋喃批發(fā)廠家,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389623961490638/1355180.png"></div><p style="text-indent:25px">二甲基甲酰胺(DMF)作為重要的化工原料以及性能優(yōu)良的溶劑,主要應(yīng)用于聚氨酯、腈綸、醫(yī)藥、農(nóng)藥、染料、電子等行業(yè).在聚氨酯行業(yè)中作為洗滌固化劑,主要用于濕法合成革生產(chǎn)；在醫(yī)藥行業(yè)中作為合成藥物中間體,普遍用于制取強(qiáng)力霉素、可的松、磺胺類藥品的生產(chǎn)；在腈綸行業(yè)中作為溶劑,主要用于腈綸的干法紡絲生產(chǎn)；在農(nóng)藥行業(yè)中用于合成高效低毒農(nóng)藥殺蟲劑；在染料行業(yè)作為染料溶劑；在電子行業(yè)作為鍍錫零部件的淬火及電路板的清洗等；其它行業(yè)包括危險(xiǎn)氣體的載體、藥品結(jié)晶用溶劑、粘合劑等。能與水、醇、醚、酯、酮、不飽和烴、芳香烴等混溶。</p><p style="text-indent:25px">2-甲基呋喃可用于溶液聚合中作溶劑使用，也可用于合成戊二烯、戊二醇、乙酰丙醇及酮類和2-甲基四氫呋喃。在醫(yī)藥工業(yè)中，可用于合成維生素B1、磷酸氯喹和磷酸伯氨喹等。包裝類型：180公斤鍍鋅桶，或ISO Tank,20噸/罐，也可根據(jù)客戶要求包裝。儲(chǔ)存方式：儲(chǔ)存于陰涼、干燥、通風(fēng)良好的庫房。遠(yuǎn)離火種、熱源。防止陽光直射。包裝密封。與氧化劑、酸類分開存放。產(chǎn)品運(yùn)輸：運(yùn)輸過程中應(yīng)有遮蓋物，確保包裝不泄露、不倒塌、不墜落、不損壞，防止猛烈撞擊，不得與還原性物質(zhì)混運(yùn)。四氫呋喃是一種重要的有機(jī)化工及精細(xì)化工原料。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="徐州2-甲基四氫呋喃批發(fā)廠家,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389623991305064/1986424.png"></div><p style="text-indent:25px">呋喃類藥是一類化學(xué)合成藥。能作用于細(xì)菌的酶系統(tǒng)，干擾細(xì)菌的糖代謝而有抑菌作用。使用的呋喃類藥物有10余種，較常用的有呋喃妥因、呋喃唑酮、呋喃西林等，臨床上因呋喃西林易引起多發(fā)性神經(jīng)炎，故只供外用。呋喃妥因（呋喃啶）***范圍較廣，對(duì)多種革蘭氏陽、陰性細(xì)菌均有控制作用，但對(duì)綠膿桿菌無效。吸收后由尿排泄，常用于***泌尿系***。細(xì)菌對(duì)本品不易產(chǎn)生耐藥性?？煽诜盟?。注意：腎功能不全者慎用。過敏反應(yīng)可致胸悶、氣喘等?？砂l(fā)生周圍神經(jīng)炎，表現(xiàn)為手足麻木及肌萎縮。中毒性精神癥狀則為幻視、幻聽等。胃腸道反應(yīng)、溶血性貧血及肺部并發(fā)癥也能發(fā)生。呋喃唑酮（痢特靈）***譜和呋喃啶相似，對(duì)消化道的多種細(xì)菌有控制作用，也可控制滴蟲。口服吸收較少，主要在腸道起作用，主治腸炎、痢疾和傷寒等。對(duì)幽門螺旋菌有控制作用，故可用于***潰瘍病。可口服用藥。注意：常見胃腸反應(yīng)；常有遲發(fā)性皮疹、等反應(yīng)；也可發(fā)生肺浸潤、***、直立性低血壓、低血糖等反應(yīng)。本品可引起多發(fā)性神經(jīng)炎，每日量超過0.4克或總量超過3克時(shí)較易發(fā)生，癥狀可遷延至數(shù)月或一年以上，故應(yīng)密切控制用量。新生兒或先天缺少血球保護(hù)酶者可致溶血性貧血。四氫呋喃可以通過氫氧化鈉置于密封瓶中在暗處保存。嘉興2-甲基四氫呋喃廠家電話是多少</p><p style="text-indent:25px">四氫呋喃普遍用于表面涂料。徐州2-甲基四氫呋喃批發(fā)廠家</p><p style="text-indent:25px">甲基效應(yīng)在藥物化學(xué)中眾所周知，然而對(duì)于藥物分子的后期修仍具有一定的挑戰(zhàn)。通過鈷催化劑，實(shí)現(xiàn)了對(duì)復(fù)雜藥物分子后期的C-H甲基化反應(yīng)。依賴于硼的甲基化試劑，同時(shí)利用分子內(nèi)在的導(dǎo)向基團(tuán)來活化C-H鍵，該反應(yīng)具有普遍的適用性。此外，該反應(yīng)無需預(yù)功能化或后脫保護(hù)，即可對(duì)各種市售藥物分子和天然產(chǎn)物進(jìn)行甲基化。同時(shí)，理化性質(zhì)和生物學(xué)測(cè)試也證實(shí)了這種看似微小的結(jié)構(gòu)變化，會(huì)影響重要的藥物特性。在藥物開發(fā)中，后期官能團(tuán)化或后期修飾至關(guān)重要。這種策略可直接對(duì)生物活性分子進(jìn)行結(jié)構(gòu)多樣化修飾，從而避免從頭合成，并迅速獲得目標(biāo)產(chǎn)物。過渡態(tài)金屬催化的特定位置C-H活化，已實(shí)現(xiàn)在復(fù)雜分子上引入體積較小的官能團(tuán)（如氟、氰基、胺或者短鏈烷烴）。而在藥物結(jié)構(gòu)中，C-H鍵上的氫被甲基取代后，有助于提高藥物的結(jié)合親和力、生物利用度、代謝穩(wěn)定性，改變藥物的藥代動(dòng)力學(xué)，從而被藥物化學(xué)家稱為“神奇的甲基效應(yīng)”或者“魔幻的甲基效應(yīng)”。徐州2-甲基四氫呋喃批發(fā)廠家</p></p><br /><p>文章來源地址: http://m.cdcfah.com/cp/3071568.html</p></div></div></div></div></div><div id="w37b3qc" class="page-right twoColRt"><div id="2yt232t" class="box01 margin10 clearfix"><h3><a href="http://m.cdcfah.com/cp/">猜你喜歡</a></h3><div id="rpbspgx" class="recomPic likePro"><a 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