The hydrotalcite (n(Mg)/n(Al)=3) calcined at 500 ℃, containing a great number of fine pores (d<3 5 nm, 34% of the all pore volume) and increased BET surface area by about three times (from 75 to 205 m 2/g), has be...The hydrotalcite (n(Mg)/n(Al)=3) calcined at 500 ℃, containing a great number of fine pores (d<3 5 nm, 34% of the all pore volume) and increased BET surface area by about three times (from 75 to 205 m 2/g), has been successfully applied to the selective ethoxylation reaction of a mixture of alcohols. The experimental results showed that the calcined hydrotalcite is an efficient solid base catalyst for synthesis of BuO(EO) 3H with high selectivity of over 90%.展开更多
建立了基于聚(乙二醇-ran-丙二醇)单丁基醚(聚合物)与磷酸盐、氯化钠的双水相体系对乳清分离蛋白(WPI)中的α-乳白蛋白(α-LA)和β-乳球蛋白(β-LG)进行分离,并对其分离条件进行了优化。系统地研究了双水相体系p H值、聚合物与KH_2PO_4...建立了基于聚(乙二醇-ran-丙二醇)单丁基醚(聚合物)与磷酸盐、氯化钠的双水相体系对乳清分离蛋白(WPI)中的α-乳白蛋白(α-LA)和β-乳球蛋白(β-LG)进行分离,并对其分离条件进行了优化。系统地研究了双水相体系p H值、聚合物与KH_2PO_4溶液体积比、Na Cl添加量和WPI浓度对α-LA和β-LG的分离效果的影响,采用液相色谱法对α-LA和β-LG的分离效果进行评价。结果表明,聚合物/KH2PO4双水相体系p H=4.0,40%(m/m)聚合物与15.5%(m/m)KH2PO4的体积比为4 m L∶4 m L,Na Cl添加量为0.40 g/10 m L,WPI浓度为1 mg/m L时,α-LA和β-LG分离效果最好,上相中α-LA的萃取率为98.2%,下相中β-LG的萃取率为96.6%。展开更多
文摘The hydrotalcite (n(Mg)/n(Al)=3) calcined at 500 ℃, containing a great number of fine pores (d<3 5 nm, 34% of the all pore volume) and increased BET surface area by about three times (from 75 to 205 m 2/g), has been successfully applied to the selective ethoxylation reaction of a mixture of alcohols. The experimental results showed that the calcined hydrotalcite is an efficient solid base catalyst for synthesis of BuO(EO) 3H with high selectivity of over 90%.
文摘建立了基于聚(乙二醇-ran-丙二醇)单丁基醚(聚合物)与磷酸盐、氯化钠的双水相体系对乳清分离蛋白(WPI)中的α-乳白蛋白(α-LA)和β-乳球蛋白(β-LG)进行分离,并对其分离条件进行了优化。系统地研究了双水相体系p H值、聚合物与KH_2PO_4溶液体积比、Na Cl添加量和WPI浓度对α-LA和β-LG的分离效果的影响,采用液相色谱法对α-LA和β-LG的分离效果进行评价。结果表明,聚合物/KH2PO4双水相体系p H=4.0,40%(m/m)聚合物与15.5%(m/m)KH2PO4的体积比为4 m L∶4 m L,Na Cl添加量为0.40 g/10 m L,WPI浓度为1 mg/m L时,α-LA和β-LG分离效果最好,上相中α-LA的萃取率为98.2%,下相中β-LG的萃取率为96.6%。
