苯甲酸甲酯的精制及開(kāi)發(fā)利用研究.pdf

1、天津大學(xué)碩士學(xué)位論文苯甲酸甲酯的精制及開(kāi)發(fā)利用研究姓名：高軍申請(qǐng)學(xué)位級(jí)別：碩士專(zhuān)業(yè)：高分子材料指導(dǎo)教師：姚芳蓮魏文波2000.9.1ABSTRACTInthisthesisthemethodabouthowtOgetridofmereimpurityincrudeBesteraby—productinthemannfacturingofDMTfiedimethylterephthalte)isgiventOobtainhigh—puri

2、fiedB—esteranditSfeasibilityintherealmanufactureisstudiedInordertopreparefordevelopingnewproducesoftheDMTunits，thetechnologicconditionsarealsoinvestigatedofproducingsodiumbenzoatefromcrudeBesterTWOroutesusedtemoveimpurit

3、yincrudeBesterespeciallytherelativelyhighcontentedptolualdehydeareasfollowing：1、adddensesulfuricacidintotheprocessofvacuumdistillation；2、firstaddtheaqueoussodiumhydrogensulfiteandmakeitreactwithaldehydes、waterwasusedasex

4、tractanttowashtheorganicphase，andfinallygettheproductbyreducedpressuredistillationinthepresenceofsulfuricacidTheresultsofexperimentsshowthatthepurltyofBestercouldbe980percentorabovebyusingtheformermethod，andifweneedthepu

5、rityabove990percent。thelateroneiSthebestchoiceInadditionthepurityofBesteralsodependsontheconditionsofremovingaldehydeandtheoperationalconditionsofthedistillationThepurifiedBesterCallbeusedtoproduceperfumeandhigh—purified

6、reagentTheoptimumconditionsofsaponificationbetweenpurifiedBesterandsodiumhydroxideareshownasfollows：reactiontemperatureiSbetween90℃and95℃andthelimitingconcentrationofsodiumhydroxideiSfrom18％to19％Undertheseconditions，the9