The Reductive Hydrogenation To P-Nitrophenol, The Recycle Of The Catalyst And The Treatment To The Waste Water

Preparation to p-aminophenol has many method, p-nitrophenol iron pink hydrogenation law, p-nitrophenol of hydrogenation law, nitro group benzene electrolysis deoxidation law etc.Will raise product quality, cost reduction to p-aminophenol greatly if hydrogenation law studying success, deficiency making up iron pink deoxidation law's, the resource dissipation and the environmental pollution problem solving are especially important.This study lies in capital; adopt nanometer to catalyze a technology, draw support from to catalyze hydrogenation, have made use of auxiliary in chlorine alkali procedure of production to produce a hydrogen, have saved the sources of energy, accord with the country along the clean production road,The main body of a book has been studied mainly to p-nitrophenol catalyzes hydrogenation . The menstruum having studied diversity and match a ratio, different catalyst, the various factor collects the effect leading under different temperature condition in hydrogenation reaction process, to product quality. "The three wastes" treatment method having studied hydrogenation reaction is generated at the same time. Especially the wastewater treatment method. Pass large amount of experiment, and looking at and appraising the colour spectrum and chemical analysis method carrying out qualitative analysis.Study that result indicates hydrogenation combining and the post-processing , liquid looks at and appraises to p-aminophenol is to there be no the clean handicraft contaminating.Study originally in the field of menstruum: Respectively with methanol , alcohol, alcohol, water, water are menstruum,Simultaneous choice aspect in catalyst: The nickel choosing nanometer ,Leini nickel , platinum charcoal etc. have done large amount of experiment respectively. Secondly, have carried out large amount of experiment on the impact of reactive the temperature , pressure over hydrogenation reaction , have gained large amount of actual data, and the induction being in progress , have summed up , have come to a conclusion as follows:1. Menstruum: With alcohol: water (3 : 1) is that reaction uses menstruum.2. Catalyst: Take Leini nickel as hydrogenation catalyst, nanometer nickel is catalyst especially, is to be put into use be economy most.3. Reaction temperature: 95 ～ 105℃ is the best reaction temperature.4. Hydrogenation reaction pressure: 1.5 ～ 2.0MPa.Treatment has also done certain research besides to generating "the three wastes" in p-aminophenol procedure of production, among them, waste water may adopt menstruum to extract law and the law burning, the waste catalyst but reclaim has made use of again.