Clean Demetallization Of Metal Porphyrin Under The Supercriticality

When the crude oil is extracted,nickel and vanadium porphyrin which exist in crude oil will cause the oil cracking catalyst poisoning effect,it would seriously affect the product quality and economic efficiency of enterprises,therefore,metal porphyrin in the crude oil to be removal is imperative.Now using in processing crude oil in the main method of metalloporphyrins is de-hydrogenation metal(HDM),under the specific reaction conditions adding hydrogen makes the metal porphyrin macrocycle destruction so that the metal is separated.As the crude oil composition is very complex,such as contain S,N and other miscellaneous elements,in the de-hydrogenation reaction,S,N bound to react negatively affect in the process,while S,N-product causes environmental damage and hazards.In the hydrodemetallation leads to explosive because of hydrogen,so there is great potential explosion risk management and increase the difficulty of hydrogen management.In this study,supercritical method to deal with oil in the metalloporphyrin,using formic acid instead of hydrogen to further improve the process de-metalloporphyrins.Mainly on account of tonnic acid decomposition at high temperature and pressure will produce hydrogen,and formic acid is the liquid,easy to store and transport.At the same time in the supercritical fluid under high diffusion coefficients of both gases and low viscosity properties,there are similar with the liquid density and intensity of physical well-dissolved in supercritical fluids near the special nature of these temperature and pressure very sensitive to the changes.Therefore,in the supercritical state,the pressure on the reaction rate constants have a strong reaction,small pressure changes can also occur the reaction ate constant several orders of magnitude of rate changes;hile under the critical state of the chemical reaction,can reduce some of the require high-temperature reaction temperature,inhibit or slow pyrolysis reaction in the common phenomenon of coke,while significantly improving product yield and reaction selectivity;the most important advantage is that supercritical state,toxic and hazardous substances such as sulfide,nitrogen oxides and other hannful substances in the environment under high temperature and pressure to break down into inorganic substances invisible to its environment-friendly products on pollution.At the same time,on account of this research study of nickel and vanadium porphyrin porphyrin high stability,the effect is not obvious and other factors,by a similar chemical structure of the copper porphyrin to proceed,the metalloporphyrins studied supercritical to the metal.And then step by step,in-depth study of bond energy is relatively large,the reaction of nickel-2,3,7,8,12,13,17,18 more difficult-tetraphenylporphyrin(Ni-TPP)and Vo-2,3,7,8,12,13,17,18-tetraphenylporphyrin(VO-TPP).In this study the use of supercritical phase behavior of the mixture state observation,through the Cu-TPP in the supercritical state of water,the mixture phase behavior observation,found that Cu-TPP at 300 ?,soluble in the aqueous phase began,especially when 375 ? completely dissolved in the aqueous phase.Then by controlling the temperature,time variables,obtained in the reaction temperature 350 ?,reaction time 60min under the conditions,the reaction best.Finally,the use of UV-visible spectroscopy of laser photometer and matrix support from the ionization-time of flight mass analysis meter type Cu-TPP verified through super-critical method,the resultant target containing 5,10,15,20-tetraphenyl resultant porphyrin(TPP).Then using a similar method of Ni-TPP and VO-TPP to control the temperature,the time variable and other methods,and even still the reaction by adding the catalyst is kaolin study on the impact of metal removal.