CO加氢合成复合式反应器工艺研究

Study on the Synthesis Process of CO Hydrogenation in Compound Reactor

新开发的复合式反应器组合了气流床和浆态床两部分。在反应器的气流床内,对CO加氢合成反应工艺条件进行研究,重点考察了温度、压力和空速对出口产物体积含量、产物时空产率的影响,同时还测定了反应过程中整个床层轴径向的温度分布,为确定复合式反应器内CO加氢合成工业化生产最佳反应条件提供基础数据。研究结果表明,在复合式反应器内,合成过程存在一个最佳反应温度范围为240～260℃,此时反应产率达到最大值;反应产率随着压力的增大单调递增;一定的催化剂循环量下,空速增大虽然可以提高产物的产率,但增大到一定值后出口产物体积含量反而会降低;一定的气体流量下,催化剂浆料的循环量有一个最佳值,高于这个值,出口产物体积含量以及产物的时空产率都将降低。由实验结果可知,反应器床层的轴径向温度分布均匀,床层温度易于控制。

The new compound reactor that combines the entrained - flow reactor and slurry reactor was studied. CO hydrogenation was observed in the entrained - flow part of the new reactor, and the effect of different operation parameters on the synthesis process was analyzed. The effects of temperature, pressure and space velocity on the concentration and space time yield of the product in the outlet gas were discussed. The longitudinal and the radial temperature distribution of the reactor were also determined. The results showed that there is an optimum temperature range in which product yield can reach a maximum, and it increases with the increase of reaction pressure. Under the certain circulation of catalyst slurry, large space velocity of syngas can really advance product yield, but it decreases the concentration of product in the outlet gas. When the syngas flux is definite, there is an optimum circulation of catalyst slurry,and the concentration of product in the outlet gas and the product yield will decline if the circulation is enlarged more than the optimum value. The distribution profiles of the longitudinal temperature and radial temperature of the reactor were fiat and the temperature of the reactor is easy to be controlled.