Study On The Hydration Reaction Process Of 1-octene Catalytic Distillation

Isooctanol is an essential chemical product primarily used in the production of fine chemicals such as defoamers and surfactants.As its applications continue to expand,efficient preparation of isooctanol has become a popular research topic.The current industrial routes for isooctanol preparation include castor oil cracking,2-Octanone hydrogenation,and carbonyl synthesis.In recent years,with the increasing environmental requirements,green production processes is more and more favored.The1-octene hydration process with green and environmentally friendly characteristics has become a promising process for development.However,this method is limited by its slow reaction rates and low conversion rates,making it unsuitable for industrial use.Therefore,this paper addresses the above issues through catalytic distillation techniques and the addition of cosolvents,the kinetic data of 1-octene hydration reaction were first measured experimentally,and then the feasibility of the process was analyzed using the residual curve method,based on which the process was optimized and simulated using process simulation software.The main research elements of which are as follows:(1)The kinetics of the direct hydration process of 1-octene were investigated in a high-pressure reactor using 1,4-dioxane as a cosolvent and HZSM-5 molecular sieve as the catalyst.The impact of reaction temperature,molar ratio of water to olefin in the raw material,and catalyst content on the reaction process were examined after excluding the influence of internal and external diffusion.The pseudo-homogeneous reaction kinetic model was used to fit the experimental data and determine the reaction’s kinetic model parameters.Finally,the reaction process was calculated using kinetic equations,and compared with experimental values,it can be seen that the kinetic model established by the experiment can describe the kinetic behavior of the reaction.(2)The missing binary interaction parameters were estimated by the UNIFAC model,a thermodynamic model was developed,and the obtained kinetic model was used to develop a residual curve model for this system to analyse the feasibility of the1-octene-catalyzed distillation hydration reaction process.The reliability of the residual curve model was verified by simple distillation experiments.The effect of Da values on the hydration system of 1-octene was also examined,when 0< Da < 0.03,the process is feasible and the process is controlled by the reaction kinetics.(3)The conceptual design and optimization of an 1-octene-catalyzed distillation hydration process using 1,4-dioxane as a cosolvent were conducted using chemical process software.The effects of reflux ratio,bottom material flow rate,feed position,number of plates in the reaction section,molar ratio of water to 1-octene,and molar ratio of 1,4-dioxane to 1-octene in the feedstock on the calculation results were investigated to obtain better process conditions.Finally,a better process design solution was obtained by comparing three different process flows.The calculation study was carried out,and the suitable operating conditions were as follows: the feed volume of 1-octene was 6 mol/h,the molar ratio of water to 1-octene in the raw material was 2.3,the molar ratio of1,4-dioxane to 1-octene in the raw material was 0.6,the reflux ratio was 0.7,the tower substrate extraction volume was 3 mol/h,the feed position was the 16 th plate,the number of plates in the reaction section was 12,and the whole tower was 24.Under the condition that the theoretical number of plates is 24,the conversion of 1-octene in the process can reach 51 %,the energy required for the process is about 1.02 k W,and the purity of the product can reach 99.3 %.It can be seen that the 1-octene catalyzed distillation hydration process with 1,4-dioxane as co-solvent is a very promising new process and can also provide a reference for the production design of other high carbon alcohols.