循环气流床反应器甲醇合成研究

1975年美国Chem Systems Inc公司提出液相法甲醇合成工艺的概念，采用导热性能优良的液体作为热载体，床层温度均匀易控，从而可提高原料气的单程转化率，出口甲醇质量分数可达到15％。传统浆态床反应器相对固定床虽然具有良好的传热性能，温度分布比较均匀，但是浆态床由于液体溶剂的存在以及气体分布不均匀，给传质过程带来了负面影响，增加了体系的复杂性。尽管优化气体分布器结构，可以起到改善传质的效果，但是还是无法明显改善传统浆态床内气液传质性能，反应器内固体沉积团聚严重。循环气流床通过循环泵的强制循环和喷嘴的雾化作用，相比如传统浆态床反应器，具有良好的传质能力、固体悬浮，并且能有效地减少轴向返混，具有相间接触充分、气液比（气固比）调节灵活、催化剂利用率高等特点。本实验研究了空速、循环量、喷嘴个数、催化剂浓度对甲醇合成的影响，为以后反应器的放大优化提供基础数据。

Study on the methanol synthesis in a circulating entrained bed reactor

Circulating entrained bed reactor has many good characteristics as follows: good mass transfer, good solid suspending, little axial backmixing, sufficient contact of different phase, wide adjustable range of gas liquid ratio and high efficiency of catalyst. Study on methanol synthesis has been carried out in the hot model experimental apparatus, and the effects of these factors such as slurry recirculation flow rate，space velocity，concentration of catalyst, the number of nozzle on the methanol synthesis has been investigated in the present study. The results show that the outlet product concentration and space time yield increase with slurry recirculation flow rate, concentration of catalyst and the number of nozzle. High space velocity of syngas enhanced the space time yield of catalyst，but decreased the outlet product concentration.