β-蒎烯热异构反应的研究

STUDY ON THERMO-ISOMERIZATiON OF β -PINENE

利用微型固定式反应器研究了β-蒎烯的热异构反应,对影响反应的主要因子作了较为深入的探讨。实验表明,采用内径为4毫米,长为300毫米的U型不锈钢管作反应管、真空度为750毫米汞柱、β-蒎烯的流量控制在0.3～0.6毫升/分、温度控制在510±10℃时,热异构产物经GC～MS联析,β-月桂烯占产物77—81％,莰烯占1～2％,对(?)烯-1(7),8-二烯占3～4％,双戊烯占9～10％,以及部分低分子量裂解产物和少量聚合物。β-蒎烯的反应转化率在98％以上。

Reaction of thermo-isomerization of β-pinene was studied in a stationary micro-reactor. Principal factors affecting the reaction were investigated in detail. The reaction was carried out in a stainlees steel U-tube of φ 4 x 300mm as reactor under 750 mmHg with controlled flux of β-pinene of 0.3-0.6ml/min and temperature at 510±10℃. β-Myrcene, amounting to 77-81% under the best condition, was the main component in the product. Others were camphene 1-2%, para-menthene-l(7) , 8-diene 3-4%, dipentene 9-10%, and small amounts of low molecular pyro-lytic products and polymers according to GC-MS analysis. The conversion rate of β-pinene was above 98%.