钯/竹炭催化剂催化湿地松松香歧化反应研究

研究钯/竹炭(Pb/BC)催化剂对湿地松松香的歧化反应,确定了最佳反应条件,催化剂用量为原料松香质量的 0.4%,搅拌速率 500 r/min,反应温度 270℃,反应时间 3 h,此时湿地松香歧化松香脱氢枞酸达到 56% 以上,枞酸降到 2% 左右,但枞酸指标仍未达到国家标准(枞酸含量≤0.5%)。在其他条件相同,催化剂用量为 0.3% 的反应条件下,采用Pd/BC催化剂也可以催化马尾松松香进行歧化反应,马尾松歧化松香中的枞酸含量为 0.43%, 可以达到国家标准。

Study on Disproportionation Reaction of Slash Pine Rosin Catalyzed by Palladium/Bamboo-charcoal (Pd/BC)

Pd/BC was used as catalyst for disproportionation of slash pine rosin. The optimal reaction condition was established. The amount of catalyst is 0.4% of raw material by mass, stirring speed is 500 r/min,reaction temperature is 270℃ and the reaction time is 3 h. In these conditions, the content of dehydroabietic acid in slash pine disproportionated rosin is above 56% and abietic acid is decreased to 2%. But this doesn’t meet the national standard (the content of abietic acid ≤0.5%). Pd/BC also catalyzes disproportionation reaction of masson pine rosin in the same conditions above, except that the catalyst amount is 0.3%. The content of abietic acid in masson pine disproportionated rosin is 0.43%, which meets the national standard.