Analysis Of Hydroquinone Synthesis Process In Environmental Safety And Study On Green Catalysis Synthesis Hydroquinone

Hydroquinone is an important fine chemical raw material, which is widely used inpesticide, medicine, water treatment and so on. The main method for hydroquinone synthesisin China is Aniline oxidation, because the process is mature, the reaction is easy to control,yield and purity of the product is higher. However, it still exists many problems such as highconsumption of raw materials, difficulty of waste disposal and serious environmentalpollution. To solve a train of environmental and security problems in synthesis process withaniline oxidation method, which are caused by excessive consumption of iron powder, largeiron sludge byproduct, high consumption of hydrochloric acid and by-products of subsequentprocessing, in this study, we obtained good results using green catalytic benzoquinone tosynthesize hydroquinone.In the paper, we analyzed the environmental security status of hydroquinone synthesis inaniline oxidation process through Preliminary Hazard Analysis. Our results showed thathydroquinone synthesis produce a large number of iron sludge using iron reductionbenzoquinone, which was difficult to handle. Moreover, chlorinated waste water was alsodifficult to control effectively with waste water treatment and other measures, it will producesecurity risk.During green catalytic synthesis, we investigated supported Ru/AC catalysts, rutheniumcomplexes[RuCl2(TPPTS)2]2, ruthenium trichloride and TPPTS to catalytic synthesishydroquinone with benzoquinone in situ. Experimental investigation showed that:5%Ru/ACwas catalyst, hydrochloric acid was reaction medium, nRu: nbenzoquinone=1:100, reactiontemperature30℃, H2pressure3.0MPa, reaction time30min, hydroquinone yield reached97.5%, the catalyst exhibited good stability in the recycling. Based on [RuCl2(TPPTS)2]2asthe catalyst, the sulfuric acid solution as reaction medium, nRu: nbenzoquinone=1:100, reactiontemperature40℃, H2pressure1.0MPa, reaction time1.5h, hydroquinone yield could reach89.56%, the catalyst had a wide range of temperature adaptation. TPPTS and RuCl3were usedto catalytic synthesis hydroquinone, sulfuric acid as reaction medium, phosphorus rutheniumratio is4, reaction time1.0h, H2pressure3.0MPa, reaction temperature30℃, hydroquinoneyield was89.56%.Green catalytic synthesis of hydroquinone obtains a higher yield, reduces environmentalpollution and resource waste, achieves clean production. In addition, it reduces the use oftoxic and hazardous materials from the source, protects environment using water as solvent, and enhances intrinsic safety of hydroquinone process. It is a cleaner, greener, safertechnology.