Strazzolini, P
1) What is the role of the H2SO4 in reactions of esterification?... i have no idea how to approach this... i know that H2SO4 --> (esterifyied?) is sulfate.. but i dunno if that has anything to do with it 2) How is he -OH radical of an alcohol different from that of an...
1.FFA was removed by acid-catalyzed firstly,then NaOH was employed to convert remaining acylglycerols into fatty acids esters.以浓H2SO4为催化剂,将游离脂肪酸先进行甲酯化,再以NaOH为催化剂,对甘油三酯进行酯交换制备生物柴油,通过正交试验分析游离脂肪酸甲酯化及甘油三酯酯交换的最佳条件。 2.After that,NaO...
And H2SO4-treated niobic acid formed Nb2O4SO4. Among these samples, H3PO4/Nb2O5 center dot nH(2)O exhibited the highest activity for the ... Y Chen,Z Wang,S Liu,... - 《Colloids & Surfaces A Physicochemical & Engineering Aspects》 被引量: 0发表: 2022年 加载更多来源...
H2SO4 was chosen as the acid catalyst because the AV of SSE was much higher than 1 (Jung et al. 2020a). The biodiesel yield from acid-catalyzed transesterification (5 wt.% H2SO4) was less than 1 wt.% after 24 h of reaction at 60 °C (Fig. 3). This is ...
由图4-18数据可看到h2so4-hb(hso4)4,h2so4-so3(或h2so4-h2sno3n+1),h2so4-hso3f和h2so4-hso3cl都是超酸。 虽然氟磺酸再浓硫酸中是弱酸,但随着浓度的增加,h0值迅速增加,直到hso3f为100%时其值达-15。1。如上节所述,再hso3f中进入强的路易斯酸(sbf5,so3,asf5)会显著地增加酸性。图4-19显示出这...
4) fatty acids esters 脂肪酸甲酯 1. FFA was removed by acid-catalyzed firstly,then NaOH was employed to convert remaining acylglycerols into fatty acids esters. 以浓H2SO4为催化剂,将游离脂肪酸先进行甲酯化,再以NaOH为催化剂,对甘油三酯进行酯交换制备生物柴油,通过正交试验分析游离脂肪酸甲酯化及...
by evaporation, (iv) the crystallisation of acetaminobenzene- sulphinic acid (ABSA), which is carried out as a continuous process; (v) the esterification of acetaminosulphone (AASO) with sulphuric acid (H2SO4) by feeding H2SO4-containing AASO in suspension in H2SO4 into a mixing ...
In this study, a series of sulfated silica (SiO2) catalyst was prepared by modification of SiO2 with sulfuric acid (H2SO4) at different concentrations; 0.5 M to 5 M H2SO4. The catalysts were characterized, and tested for esterification of LA with ethanol to ethyl levulinate (EL). The ...
2. The influence on yield by the molar ratio of ascorbic acid to palmitate ethylester, consistence of catalyst, reaction temperature , reaction time, et al. 以L-抗坏血酸和棕榈酸乙酯为原料,H2SO4为催化剂,酯交换法合成L-抗坏血酸棕榈酸酯。5...