From what I could find on Google...

Process Schizophrenia

An obsolete term for those forms of severe schizophrenic disorders in which chronic and progressive biologic conditions in the brain are considered to be the primary cause and in which prognosis is also poor, with insidious onset at a young age, as contrasted with reactive schizophrenia.

Reactive Schizophrenia

A form of schizophrenia caused by environmental factors rather than by organic changes in the brain. Disease onset is usually rapid, symptoms are of brief duration, and the affected individual appears well immediately before and after the schizophrenic episode.

I don't know if that helps.