Optimization of the preparation process of 52# Fischer-Tropsch wax based on DFSS method
52# Fischer-Tropsch wax was prepared by solvent extraction from hydrorefining reduced third-line oil,which was investigated based on the six sigma design.The mathematical models of the oil content,yield,melting point and solvent-oil ratio,solvent ratio,crystallization time,cooling rate,and crystallization temperature were proposed by using the central composite design assigned to response surface design,analyzing the influence of each factor and their interaction on the response value.The optimal combination of preparation process parameters and better operation window were obtained by multi-objective optimizing,which guided the 100kg/h pilot test to proceed smoothly.The results showed that when the solvent-oil ratio was 5,solvent ratio was 2,crystallization time was 6min,crystallization temperature was 5℃,and the cooling rate was 5.3℃/min,the melting point of the wax was 52-54℃,the oil content was 0.2％-0.8％,and the yield was more than 25％,which met the requirement of the refined wax.The experimental value was closed to the predicted value of the model,which indicated that the models had good fitting effect,high prediction accuracy and reliable quality.
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