简介:研究了用N,N-二乙胺基偶氮二异丁脒盐酸盐(ABEP)和NaHSO3组成的复合引发体系,以丙烯酰胺(AM)和二甲基二烯丙基氯化铵(DMDAAC)为单体,失水山梨醇脂单油酸酯(Span-80)和壬基酚聚氧乙烯醚(OP-10)为复合乳化剂,以液体石蜡为连续相,在反相微乳液中制备PAM/DMDAAC阳离子型共聚物。探讨了乳化剂用量、单体摩尔比、引发剂用量、油水比、溶液的pH对共聚物的特性粘数和转化率的影响。结果表明,在优化反应条件下可得到转化率为98.7%、特性粘数为1879.4mL·g^-1的共聚物。
简介:为利用科技进步提高生产效率,聚氨酯事业部于近期对聚醚60m^3生产线实施技术改造,生产效率提高20%,将增产聚醚18kt/a。由于该部聚醚装置不断扩建,生产规模不断扩大,对于聚醚中间品LP的配套生产形成了巨大压力。为与扩大后的规模相配套,提高LP生产效率、扩大聚醚产能,改造在60m^3生产线上增设外循环及循环冷却器,提高生产反应速度和原料的计量精度。改造后的60m^3生产线开车一次成功,生产周期从改造前平均每釜24h减少至19h,效率提高20%,且工艺稳定。改造后每年可增加LP产量3000t,从而增产聚醚10000t以上。
简介:Inthispaper,2-isopropylnaphthalenehasbeensynthesizedbythereactionofnaphthaleneandisopropylbromide,usingtriethylaminehydrochloride-aluminumchlorideionicliquidasthecatalyst.Theeffectofthecatalystcomposition,thereactiontime,thereactiontemperature,theionicliquiddosage,aswellasthemolarratioofthereagentsonthe2-isopropylnaphthaleneyieldwassystematicallyinvestigated.Theoptimalreactionconditionscover:anAlCl3toEt3NHClratioof2.0,areactiontimeof3h,areactiontemperatureof15.0℃,avolumefractionofionicliquidtothemixture(isopropylbromide,n-dodecaneandn-hexane)of9%,andanaphthalene/isopropylbromidemolarratioof4.0.Undertheoptimalreactionconditions,theconversionofisopropylbromidereached98%andtheselectivityof2-isopropylnaphthalenewasequalto80%.ThetestresultsverifiedgoodcatalyticactivityuponusingEt3NHCl-AlCl3ionicliquidasthecatalystforalkylationofnaphthalenewithisopropylbromide.Theactivityoftheionicliquidremainsunchangedafterithasbeenrecycledfor4times.
简介:Alkylationoftoluenewith2-chloro-2-methylpropane(t-Bu-Cl)tosynthesizepara-tert-butyltoluene(PTBT)wascarriedoutinthepresenceoftriethylaminehydrochloride-aluminumchlorideionicliquidsusedasthecatalyst.TheionicliquidswerepreparedwithdifferentmolarratiosofEt3NHCltoAlCl3,andtheeffectofthemolarratiobetweenAlCl3andEt3NHCl,thereactiontime,thereactiontemperature,theionicliquiddosage,aswellasthemolarratiooftoluenetochloro-2-methylpropaneonthealkylationreactionoftoluenewithchloro-2-methyl-propanewasinvestigated.ThetestresultsshowedthattheacidicionicliquidspreparedwithEt3NHClandAlCl3hadgoodactivityandselectivityforthealkylationreactionoftoluenewithalkylchloridetoproducePTBT.TheoptimalreactionconditionswerespecifiedatanAlCl3toEt3NHClratioof1.6,areactiontemperatureof20℃,amassfractionoftoluenetoionicliquidof10%,andachloro-2-methylpropanetotoluenemolarratioof0.5.Underthesuitablereactionconditions,a98%conversionofchloro-2-methylpropaneandan82.5%selectivityofPTBTwereobtained.Ionicliquidscouldbereused5timeswithitscatalyticactivityunchanged,andtheregeneratedionicliquidscanberecycled.