Pattern Identification And Removal Of Chlorine In Oil

In recent years,due to the use of oil chemical additives,the content of organic chloride in oils has increased.Organic chloride in oil can cause corrosion and blockage of pipes and equipment,and poison the catalyst.Therefore,it is necessary to carry out organic chloride removal research on oils with high organic chloride content.The premise of removing organic chlorides is to study the types of organic chlorides in oils.However,there is no standard chromatographic method for the study of the types of organic chlorides in oils.It is very important and necessary to establish a gas chromatographic analysis method for organic chlorine in oil products,and to study the distribution,types and removal of organic chlorine in oil products.First,a gas chromatographic analysis method for organic chlorides in oil products was established.Linear equations for organic chlorides were obtained.And a system adaptability test was performed.Then,the crude oil A,crude oil B and crude oil C were cut through fractional distillation experiments to obtain distillates of IBP-180?,180-280?,280-350? and > 350?.The difference distribution method was used to study the distribution of chloride.The types of organic chlorides in IBP-180? and 180-280?distillates were studied by gas chromatography.Finally,Gauss software was used to simulate the molecular diameter of the identified organic chloride.Preparation the adsorbent.A static adsorption method was used to adsorb and remove the organic chlorides in the simulated oil.The adsorption experiments of organic chlorides in model oils were carried out to explore the dechlorination effects of adsorption time,adsorption temperature,dosage and initial concentration of organic chlorides.And the adsorption equilibrium,adsorption thermodynamics and adsorption kinetics were studied.The experimental results showed that the established gas chromatography method had high accuracy and precision,and was suitable for qualitative and quantitative analysis of organic chlorides in oils.The content of organic chloride in crude oil A was 38.59mg/L,and the distribution was dumbbell-shaped.The content of organic chloride in crude oil B was 45.92 mg/L,and the distribution was water drop-shaped.The content of organic chloride in crude oil C was 17.25 mg/L,and the distribution was spindle-shaped.The inorganic and organic chlorides in the three crude oils were mainly present in atmospheric residues.The organic chlorides that common to the three crude oils were dichloromethane,methallyl chloride,tetrachloroethylene,1,1,2-trichloroethane,1,3-dichloropropane,allyl chloride and 5-chloro-2-methylaniline.And the large proportion of organic chlorines were 5-chloro-2-methylaniline,1,4-dichlorobutane,dichloromethane,3-chloro-2-methyl-1-propene and 3-chloro-2-methylaniline.The diameter of the organic chloride molecule calculated by simulation was less than 0.7 nm.Optimum adsorption conditions of Cu-BTC for 3-chloro-2-methyl-1-propene,1,4-dichlorobutane,3-chloro-2-methylaniline and 5-chloro-2-methylaniline: time was 240 min,adsorption temperature was 30?,and adsorption dosage was 1:40 g/m L.The adsorbent had good regeneration performance.The adsorption process was suitable for description with Langmuir adsorption isotherms and pseudo-second-order kinetic models.The maximum adsorption capacity of Cu-BTC for these four organochlorines was 11.90 mg/g,5.21 mg/g,23.81mg/g and 47.62 mg/g at 30?.This adsorbent had good adsorption selectivity and was easy to adsorb organic chlorine with ? bond.Adsorption was a multi-step control process that was mainly based on chemical adsorption,spontaneous,endothermic,and uniformly adsorbed on the molecular layer.