品牌 | 韓國SK |
EINECS編號 | 204-411-8 |
英文名稱 | Dimethyl terephthalate |
CAS編號 | 120-61-6 |
純度 | 99.9% |
別名 | 對苯二甲酸二甲酯 |
分子式 | C10H10O4 |
產地/廠商 | 韓國SK |
對(dui)苯(ben)二甲(jia)酸二甲(jia)酯(zhi)DMT產品簡單介紹如下:
生產方(fang)法(fa)由(you)對(dui)苯(ben)(ben)二(er)(er)甲(jia)(jia)(jia)(jia)酸(suan)與甲(jia)(jia)(jia)(jia)醇酯(zhi)(zhi)化(hua)(hua)(hua)而得。最早采(cai)用(yong)(yong)硫酸(suan)催(cui)化(hua)(hua)(hua)劑,反(fan)(fan)應(ying)溫度65-100℃,酯(zhi)(zhi)化(hua)(hua)(hua)時(shi)間(jian)10-16h。用(yong)(yong)此(ci)法(fa)甲(jia)(jia)(jia)(jia)醇消耗量(liang)大,生產能力低。提高(gao)反(fan)(fan)應(ying)壓(ya)(ya)力,在(zai)0.39-0.49MPa下酯(zhi)(zhi)化(hua)(hua)(hua),反(fan)(fan)應(ying)時(shi)間(jian)可(ke)縮短為(wei)1-2h,甲(jia)(jia)(jia)(jia)醇的(de)損失量(liang)也比常壓(ya)(ya)法(fa)減少。近年采(cai)用(yong)(yong)高(gao)溫高(gao)壓(ya)(ya)液相酯(zhi)(zhi)化(hua)(hua)(hua)法(fa),反(fan)(fan)應(ying)溫度250-300℃,壓(ya)(ya)力2-2.5MPa,可(ke)采(cai)用(yong)(yong)錫、鋅、銻化(hua)(hua)(hua)物為(wei)催(cui)化(hua)(hua)(hua)劑,也可(ke)以不用(yong)(yong)Chemicalbook催(cui)化(hua)(hua)(hua)劑。以對(dui)苯(ben)(ben)二(er)(er)甲(jia)(jia)(jia)(jia)酸(suan)計的(de)收率(lv)可(ke)達(da)96-98%或更高(gao)。另(ling)一(yi)(yi)種生產DMT的(de)方(fang)法(fa)是通過(guo)威頓-赫格(ge)里(li)斯(Witten-Hercules)法(fa)制造,即(ji)采(cai)用(yong)(yong)對(dui)二(er)(er)甲(jia)(jia)(jia)(jia)苯(ben)(ben)分段氧(yang)化(hua)(hua)(hua)酯(zhi)(zhi)化(hua)(hua)(hua)的(de)方(fang)法(fa),此(ci)法(fa)在(zai)對(dui)二(er)(er)甲(jia)(jia)(jia)(jia)苯(ben)(ben)的(de)兩個甲(jia)(jia)(jia)(jia)基氧(yang)化(hua)(hua)(hua)過(guo)程中,把(ba)(ba)先氧(yang)化(hua)(hua)(hua)的(de)羧(suo)基進(jin)行(xing)甲(jia)(jia)(jia)(jia)酯(zhi)(zhi)化(hua)(hua)(hua),以免在(zai)下一(yi)(yi)步氧(yang)化(hua)(hua)(hua)時(shi)發生副反(fan)(fan)應(ying)。為(wei)了簡化(hua)(hua)(hua)流程,可(ke)把(ba)(ba)兩步氧(yang)化(hua)(hua)(hua)合并在(zai)一(yi)(yi)個氧(yang)化(hua)(hua)(hua)反(fan)(fan)應(ying)器中進(jin)行(xing),兩步酯(zhi)(zhi)化(hua)(hua)(hua)也合并在(zai)一(yi)(yi)個酯(zhi)(zhi)化(hua)(hua)(hua)反(fan)(fan)應(ying)器中進(jin)行(xing)