abstract |
A process is described for preparing 3-pentenenitrile by hydrocyanating 1, 3-butadiene in the presence of at least one catalyst, wherein unhydrocyanated 1, 3-butadiene is removed from the effluent of the hydrocyanation and recycled into the process, and the recycled 1, 3-butadiene is monitored for the content of hydrogen cyanide. |