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class="pic"><img src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624016490617/6540095.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="tia4tzz" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624016490617/6540095.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="zdauwip" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價(jià)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>連云港2-甲基四氫呋喃采購價(jià)格,2-甲基四氫呋喃</p><p><span>***更新：</span>2020-12-05 06:21:50</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="s3spryk" 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="zoqk78i" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="oip23ja" class="box"><p><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盟帯Ｗ⒁猓耗I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)，連云港2-甲基四氫呋喃采購價(jià)格、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?？诜蛰^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(rùn)、***、直立性低血壓，連云港2-甲基四氫呋喃采購價(jià)格、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，連云港2-甲基四氫呋喃采購價(jià)格，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。THF經(jīng)硫化氫處理生成四氫硫酚，可作燃料氣中的臭味劑。連云港2-甲基四氫呋喃采購價(jià)格</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="連云港2-甲基四氫呋喃采購價(jià)格,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624016490617/6540095.png"></div><p style="text-indent:25px">侵入途徑：吸入、食入、經(jīng)皮吸收。健康危害：本品具有刺激和麻醉作用。吸入后引起上呼吸道刺激、惡心、頭暈、***和系統(tǒng)控制。能引起肝、腎損害。液體或高濃度蒸氣對(duì)眼有刺激性。皮膚長(zhǎng)期反復(fù)接觸，可因脫脂作用而發(fā)生皮炎；環(huán)境危害：對(duì)水生生物有毒性。燃爆危險(xiǎn)：極易燃，其蒸氣與空氣混合，能形成性混合物。急救措施。皮膚接觸：脫去污染的衣著，用肥皂水和清水徹底沖洗皮膚。如有不適感，就醫(yī)眼睛接觸：提起眼瞼，用流動(dòng)清水或生理鹽水徹底沖洗10-15min。吸入：迅速脫離現(xiàn)場(chǎng)至空氣新鮮處。保持呼吸道通暢。如呼吸困難，給屬氧。呼吸、心跳停止，立即進(jìn)行心肺復(fù)蘇術(shù)。就醫(yī)食入：漱口。如有不適感。就醫(yī)消防措施危險(xiǎn)特性：其蒸氣與空氣可形成性混合物，遇明火、高熱及強(qiáng)氧化劑易引起燃燒。接觸空氣活在光照條件下可生成具有潛在危險(xiǎn)性的過氧化物。與酸類接觸能發(fā)生反應(yīng)。與氫氧化鉀、氫氧化鈉反應(yīng)劇烈。蒸氣比空氣重，沿地面擴(kuò)散并易積存于低洼處，遇火源會(huì)著火回燃。金華2-甲基四氫呋喃生產(chǎn)廠家排行榜2-甲基四氫呋喃是用于合成藥物磷酸氯喹和磷酸伯氨喹的主要原料。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="連云港2-甲基四氫呋喃采購價(jià)格,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624097545321/7454619.png"></div><p style="text-indent:25px"> 在堿性條件下非常穩(wěn)定、大多數(shù)酸性條件下也穩(wěn)定；與水分層界面非常清晰；與水分層，水在下層；而DCM與水分層，水在上層；用MeTHF作溶劑，產(chǎn)品可在釜內(nèi)脫水，因?yàn)镸eTHF與水形成特殊的共沸物； MeTHF的沸點(diǎn)為80℃，回流冷凝器可用水作為冷卻介質(zhì)。 MeTHF的優(yōu)點(diǎn)：頭孢類藥物頭孢克肟的生產(chǎn) 頭孢克肟，抗藥拉西地平的生產(chǎn) 拉西地平 2-甲基四氫呋喃回收容易 2-甲基四氫呋喃在工業(yè)化生產(chǎn)中的優(yōu)勢(shì)：綜合成本低， 2-甲基四氫呋喃在工業(yè)化生產(chǎn)中的優(yōu)勢(shì) ，環(huán)境影響小，2-甲基四氫呋喃在工業(yè)化生產(chǎn)中的優(yōu)勢(shì)， 2-甲基四氫呋喃能提高加成產(chǎn)物的收率，而THF常常導(dǎo)致還原產(chǎn)物增加而使加成產(chǎn)物的產(chǎn)率降低。</p><p style="text-indent:25px"> 共沸回收2-MeTHF的能耗比用精餾法回收THF的能耗低70%。 THF因沸點(diǎn)低，水溶性極好，損耗大，回收率低，回收成本高，三廢處理費(fèi)用高。長(zhǎng)期使用2-MeTHF綜合成本比使用THF低。 2-甲基四氫呋喃沸點(diǎn)較高,容易冷凝回收,揮發(fā)損失少,大氣污染??；在水中溶解度小,通過共沸精餾后回收率高,進(jìn)入廢水中的2-甲基四氫呋喃含量低,容易處理。 **、四氫呋喃、鹵代烷和苯等環(huán)境不友好的溶劑每年消耗量超過幾十萬噸，其中作為格氏反應(yīng)溶劑的**和四氫呋喃每年用量在萬噸以上。用2-甲基四氫呋喃替代上述環(huán)境不友好的溶劑符合綠色化工技術(shù)的要求，而且市場(chǎng)前景十分廣闊，經(jīng)濟(jì)和社會(huì)效益十分明顯。四氫呋喃是一種常用的中等極性非質(zhì)子性溶劑。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="連云港2-甲基四氫呋喃采購價(jià)格,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624080435939/3968180.png"></div><p style="text-indent:25px">聚四氫呋喃二醇的工業(yè)化生產(chǎn)工藝根據(jù)催化劑的不同主要有氟磺酸催化聚合工藝、乙酸酐-高氯酯催化聚合工藝和雜多酸催化聚合工藝。其中氟磺酸催化工藝對(duì)設(shè)備材質(zhì)要求較高，造價(jià)昂貴，所需氟磺酸的量大。工業(yè)化的乙酸酐-高氯酸催化工藝，由THF原料經(jīng)二乙酸酯中間體制取PTMEG，副產(chǎn)物為乙酸甲酯和甲醇，生產(chǎn)成本較氟磺酸法低。開發(fā)的雜多酸催化工藝，采用由Mo、W、V的氧化物與磷酸反應(yīng)制得多聚酸，如十二聚磷鎢酸為催化劑，一步法制得PTMEG，且催化劑為固態(tài)，可回收，是一種新工藝。實(shí)驗(yàn)室制備PTMEG：在反應(yīng)釜中加入四氫呋喃，溫度降到-5℃以下，于強(qiáng)烈攪拌下滴加發(fā)煙硫酸催化劑，保持反應(yīng)物料低溫，攪拌下加入定量的水，升溫至70～90℃，蒸出未反應(yīng)的四氫呋喃單體，經(jīng)靜置分層、中和過渡、抽真空等工序后，制得聚四氫呋喃二醇。四氫呋喃具有低毒、低沸點(diǎn)、流動(dòng)性好等特點(diǎn)。金華2-甲基四氫呋喃生產(chǎn)廠家排行榜</p><p style="text-indent:25px">相反從化合物上脫落的過程叫去甲基化。連云港2-甲基四氫呋喃采購價(jià)格</p><p style="text-indent:25px">5-二取代的四氫呋喃類混合物的制備方法，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(yīng)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(yīng)，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(shí)現(xiàn)5-羥甲基糠醛向目標(biāo)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。含有四氫呋喃的藥物共有13個(gè)。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(gè)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。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(gè)季碳手性中心，其抗***效果優(yōu)于早期的酮康唑等抗***藥，它對(duì)曲霉菌以及對(duì)先前的抗***藥具有抗性的其它******均有效。連云港2-甲基四氫呋喃采購價(jià)格</p><p style="text-indent:25px">上海蔚云化工有限公司主要經(jīng)營(yíng)范圍是化工，擁有一支專業(yè)技術(shù)團(tuán)隊(duì)和良好的市場(chǎng)口碑。公司自成立以來，以質(zhì)量為發(fā)展，讓匠心彌散在每個(gè)細(xì)節(jié)，公司旗下環(huán)戊酮，甲基異丙基酮，丙二胺，二甘醇胺深受客戶的喜愛。公司秉持誠信為本的經(jīng)營(yíng)理念，在化工深耕多年，以技術(shù)為先導(dǎo)，以自主產(chǎn)品為重點(diǎn)，發(fā)揮人才優(yōu)勢(shì)，打造化工良好品牌。在社會(huì)各界的鼎力支持下，持續(xù)創(chuàng)新，不斷鑄造***服務(wù)體驗(yàn)，為客戶成功提供堅(jiān)實(shí)有力的支持。</p></p><br 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