Molecular Distillation To Separate Crude Glycerine Technology Research

According to the physical properties of glycerol, combined with the Aspen Plus simulation software, it determined the optimum process enrichment and separation conditions of crude glycerol. Glycerol and polyglycerol products adopt the secondary flash and molecular distillation separation technology.We analyze the internals, equipment structure, the advantages and disadvantages of this technology by understanding the technical principle and operating characteristics of molecular distillation and looking up the literature of molecular distillation at home and abroad. And based on the physical properties and flow characteristics of crude glycerin, designed the technology parameters and internal components of pilot molecular distillation apparatus to separate and refine crude glycerin, designed and selected the type of supporting ancillary equipment and system. In feed rate of 281.51 kg/h, combined with the test data, initial feed temperature, operating temperature, the residual pressure of equipment in operation and scraper speed were studied. The orthogonal experiment was carried out based on the experimental data. Optimizing the process based on the results, and finally determined the optimum process conditions of molecular distillation to separate the residue glycerol:preheating temperature is 180℃, distillation temperature is 205 ℃, pressure is 15Pa, wiped film speed is 85rpm. Glycerol and polyglycerol products were used two flash and molecular distillation technology to separate.