The octenal and hydrogen are forced to find a new reaction center, which in turn causes the hot spot temperature to rise rapidly. The final result will inevitably lead to the absence of a new reaction center, the octene aldehyde is difficult to convert, the yield is lowered, and the product quality is unqualified. Once the substances are stopped from entering the hydrogenation reactor, the substances adhering to the surface of the catalyst particles will be taken out of the reactor by the circulating gas and products, and the reaction center will be exposed again. The hot spot temperature will also move down quickly and finally return to the original state. Reaction status. This shows that the catalyst is only temporarily affected but does not lose its activity. Even so, the impact on production is very large. If the n-butyraldehyde column is to be removed, the substances affecting the hydrogenation reaction must be removed. To this end, during the transformation, we changed the original three-layer sieve plate into two layers of high-efficiency structured packing, which consisted of mesh high-efficiency filler and type filler. The material flow was modified: the octene aldehyde material entered the second layer of the hydrogenation evaporator, and the octenal and octanol recovery fractions recovered from the batch distillation were passed to the first layer of the packing. The modified hydro-evaporator ensures that those substances that have an effect on the hydrogenation reaction are not carried into the hydrogenation reactor, as evidenced by software accounting. Practice has also proved that in the stream produced at the top of the evaporator, the content of the terpolymer is zero, then components heavier than the trimer, such as tetramers and phosphonates, are also not likely to be carried out of the evaporator, which is not only The hydrogenation catalyst is not damaged, but the service life of the hydrogenation catalyst can be prolonged, and the operating load of the octanol distillation system can be reduced.