化工进展
化工進展
화공진전
CHEMICAL INDUSTRY AND ENGINEERING PROGRESS
2015年
3期
797-801
,共5页
冯裕发%周维友%刘洋%吴中%何明阳%陈群
馮裕髮%週維友%劉洋%吳中%何明暘%陳群
풍유발%주유우%류양%오중%하명양%진군
K/γ-Al2O3催化剂%丙酸甲酯%三聚甲醛%甲基丙烯酸甲酯
K/γ-Al2O3催化劑%丙痠甲酯%三聚甲醛%甲基丙烯痠甲酯
K/γ-Al2O3최화제%병산갑지%삼취갑철%갑기병희산갑지
K/γ-Al2O3 catalyst%methyl propionate%trioxyane%methyl methacrylate
以K/γ-Al2O3作催化剂，丙酸甲酯（MP）为原料高效合成了甲基丙烯酸甲酯（MMA），考察了反应温度、MP质量分数、甲醛来源、K负载量、原料摩尔比及催化剂煅烧温度对反应的影响。结果表明，反应的最佳工艺条件为：反应温度320℃，MP质量分数20%，三聚甲醛作甲醛来源，催化剂K负载量为12.5%， MP与甲醛的摩尔比为1∶1，催化剂煅烧温度为1100℃。在此条件下，MMA收率为39.2%，选择性为76.1%。进一步研究表明，随着焙烧温度的升高，Al2O3的晶型也发生转变，γ-Al2O3比α-Al2O3的活性高，K—O—Al键的生成有利于催化剂性能的提高。
以K/γ-Al2O3作催化劑，丙痠甲酯（MP）為原料高效閤成瞭甲基丙烯痠甲酯（MMA），攷察瞭反應溫度、MP質量分數、甲醛來源、K負載量、原料摩爾比及催化劑煅燒溫度對反應的影響。結果錶明，反應的最佳工藝條件為：反應溫度320℃，MP質量分數20%，三聚甲醛作甲醛來源，催化劑K負載量為12.5%， MP與甲醛的摩爾比為1∶1，催化劑煅燒溫度為1100℃。在此條件下，MMA收率為39.2%，選擇性為76.1%。進一步研究錶明，隨著焙燒溫度的升高，Al2O3的晶型也髮生轉變，γ-Al2O3比α-Al2O3的活性高，K—O—Al鍵的生成有利于催化劑性能的提高。
이K/γ-Al2O3작최화제，병산갑지（MP）위원료고효합성료갑기병희산갑지（MMA），고찰료반응온도、MP질량분수、갑철래원、K부재량、원료마이비급최화제단소온도대반응적영향。결과표명，반응적최가공예조건위：반응온도320℃，MP질량분수20%，삼취갑철작갑철래원，최화제K부재량위12.5%， MP여갑철적마이비위1∶1，최화제단소온도위1100℃。재차조건하，MMA수솔위39.2%，선택성위76.1%。진일보연구표명，수착배소온도적승고，Al2O3적정형야발생전변，γ-Al2O3비α-Al2O3적활성고，K—O—Al건적생성유리우최화제성능적제고。
Methyl methacrylate was synthesized from methyl propionate and trioxyane over K/γ-Al2O3 catalyst. The effects of reaction temperature,concentration of MP,source of formaldehyde,K loading on catalyst,raw material mole ratio and calcination temperature of catalyst on the reaction were investigated. The optimum conditions for synthesizing methyl methacrylate were reaction temperature 320℃,concentration of MP 20%,trioxyane as the source of formaldehyde,K loading on catalyst 12.5%,mole ratio of MP to HCHO 1∶1,calcination temperature of catalyst 1100℃. Under the optimum conditions,yield and selectivity of MMA were 39.2%and 76.1%,respectively. With the rise of calcination temperature,crystal structure of Al2O3 changed. Activity ofγ-Al2O3 was better than that ofα-Al2O3,and activity of catalyst was enhanced by forming K—O—Al in K2Al19O29.
