摘要
利用自行改进的DEAE Sephadex离子交换色谱和气相色谱 质谱 计算机联用(GC MS DS)技术研究了在RaneyNi存在下脂松香催化加氢反应过程中各类树脂酸组成的变化。证实在本实验条件下松香催化加氢过程中的主体反应是树脂酸的二氢化,只伴随少量的四氢化和极少量的脱氢反应。发现在二氢海松酸/异海松酸型树脂酸的分子间存在因双键移位而引起的异构现象。在整个跟踪分析过程中,共检出7种二氢枞酸型树脂酸、5种二氢海松酸/异海松酸型树脂酸及3种四氢树脂酸。
Hydrogenated rosin is one of the dominant varieties of modified rosins and is widely used in industry. Conjugated unsaturation of abietictype resin acids that are the main chemical constituents of rosin can be removed through catalytic hydrogenation to overcome the shortcomings of being oxidized and color degradation in rosin. Meanwhile, small amounts of other unsaturated molecules such as pimaric/isopimarictype resin acids can also be hydrogenated. The modified DEAESephadex ion exchange chromatography and gas chromatographymass spectrometrydata system (GCMSDS) techniques were used to study the changes in resin acid composition during catalytic hydrogenation of gum rosin in the presence of Raney nickel. The representative hydrogenation process was carried out under the conditions of 170 ℃ and 6 MPa, and the samples were taken out from the autoclave under the high hydrogen pressure through a sampling apparatus assembled by the authors. The results showed that during hydrogenation of rosin under the experimental conditions the dominant reaction was the formation of dihydro resin acids with minor products of tetrahydro resin acids and dehydroabietic acid. It was found that isomerization existed between dihydropimaric/isopimarictype resin acids due to the shift of double bonds.Totally, seven dihydroabietictype resin acids, five dihydropimaric/isopimarictype resin acids and three tetrahydro resin acids were identified in the tracking analysis.
出处
《色谱》
CAS
CSCD
北大核心
2003年第2期174-177,共4页
Chinese Journal of Chromatography
基金
国家自然科学基金资助项目(No.29766002)
广西自然科学基金资助项目(桂科配9824006).
