Study On Resource Utilization Technology Of Alkylation Waste Acids

Alkylated oil is an important gasoline blending component that has high octane,no olefins,aromatics,high efficiency,and cleanliness,and is favored by the market.In the alkylation oil preparation process,concentrated sulfuric acid is mostly used as a catalyst,and acid-soluble organic substances and water are generated as a by-product of the reaction process to reduce the concentrated sulfuric acid concentration to less than 90%.Can not meet the requirements of the alkylation production process on concentrated sulfuric acid.Studies have shown that every production of 1 t of alkylated oil produces 80 to 90 kg of waste sulfuric acid at a concentration of 85% to90%.The composition contains 8% to 14% of organic matter and moisture in addition to sulfuric acid.The waste sulfuric acid has a high concentration and a pungent odor,which not only causes environmental pollution but also causes a lot of waste of resources.Therefore,how to utilize this waste sulfuric acid resource is a hot spot and difficulty in the current alkylation process.This article studies the physical properties of alkylated waste sulfuric acid,obtains related basic data,and carries out relevant technological design based on this to achieve the utilization of alkylated waste sulfuric acid resources.In this paper,the related physical properties of alkylated waste sulfuric acid were first studied to obtain the relevant basic physical properties data.Based on this,the related researches on the utilization of synthetic ammonium sulfate technology and the recycling and utilization of waste sulfuric acid were carried out.The specific content of the paper is divided into the following three parts:The first part is to determine the before and after pretreatment densities of the alkylated waste acid and to determine the before and after pretreatment concentrations of sulfuric acid under the premise that H+ is provided for sulfuric acid.The waste sulfuric acid was studied by using different filter pore sizes after mixing with deionized water at different volume ratios.The results showed that the largest amount of solid precipitates was obtained at a volume ratio of 1:1.25.Solubility analysis was performed on solid precipitates.Different organic solvents were selected to dissolveunder normal temperature conditions and found to be completely dissolved in the secondary octanol.According to elemental analysis and gas chromatography analysis,the alkylation oil production process,reaction mechanism,and similar phases were combined.The dissolution principle can be preliminarily inferred that the organics in the waste sulfuric acid may be a variety of complex advanced carbon-containing compounds.The second part is through the alkylation of the waste acid and deionized water volume ratio of 1:3 mixed with the filtrate and ammonia in the reaction at room temperature conditions,after activated carbon adsorption and recrystallization to produce a more smooth surface,small particles of sulfuric acid ammonium product.The nitrogen content of the above ammonium sulfate product using the formaldehyde method was found to be 20.84%,which is higher than the national ammonium nitrogen standard and is a qualified product.At the same time,when designing a pilot plant experiment for the preparation of ammonium sulfate by alkylation of waste sulfuric acid in a certain factory,two kinds of pilot experimental processes for preparing ammonium sulfate by direct reaction of ammonia gas and waste sulfuric acid and liquid ammonia and waste sulfuric acid were designed.The third part is the use of Aspen simulation,through the coal gasification simulation process as a model,to establish a new process technology for the co-cracking of coal and waste sulfuric acid.In this process,air is used as the combustion component at high temperature conditions by changing the feed and feed parameters.The alkylation waste acid is cracked.In the simulation process,the acid-soluble oil in the alkylation waste acid is burned into SOx and CO2,the sulfuric acid is cracked into SO2 and SO3 under high temperature conditions,and the related SOx can be scrapped through the sulfuric acid synthesis process.Recycling of sulfuric acid.