A Model Approach for the Montan Wax Extraction: Model Development and Experimental Analysis

Abstract

A model is developed based on experimental and theoretical analysis for the description of the Montan wax extraction process. This paper focuses on Graefe extraction, a standard methodology in brown coal industry, which is used to estimate the maximum yield of available wax. Using the results of Graefe extraction, the equilibrium curve and transfer coefficient can be identified by means of a global optimization algorithm Molecular-Inspired Parallel Tempering (MIPT). Another aim of the work is to predict the yields of Montan wax extracted by a percolation-column extraction, which contains 100 times amount of brown coal as it is used in Graefe extraction.

Simulation and Experimental Study of Solid–Liquid Extraction of Coal Tar Residue Based on Different Extractants

“…where parameter n ≈ 2. 12 The relationship between the magnitudes of the concentrations in equation is area, per unit time, and can reflect the degree of intensification of a specific mass-transfer process. D e indicates the ability of a solvent to diffuse in a porous solid and is a physical property of the substance.…”

“…This model applies to a specific equilibrium relationship between the concentration of solute at the surface of the particle and the concentration of solute inside the particle at the infinitesimal r = R . The extraction equilibrium relationship can be written as C * − C f C sat − C f = true( C normals false| R − C f C normals 0 − C f true) n where parameter n ≈ 2 . The relationship between the magnitudes of the concentrations in equation is C f < C * ≤ C sat and C f < C s ≤ C s0 .…”

“…The solid−liquid extraction process can be divided into three consecutive stages: immersion, dissolution, and diffusion, as shown in Figure 1. 12 The following 5 steps may be distinguished in the process:…”

“…Finally, the coal tar then reaches the solvent main solution from its surface through the fluid membrane. The solid–liquid extraction process can be divided into three consecutive stages: immersion, dissolution, and diffusion, as shown in Figure …”

Response of Properties and Chemicals to Preparation Parameters in the Oxidation Processing of Refined Montan Wax

“…RMW is prepared from DMW by oxidative bleaching, through which the color of RMW becomes close to yellow or even white and the resin content is reduced to trace amounts. Compared to CMW and DMW, RMW has noticeable advantages in appearance for use in high-value products such as lipsticks, hair gels, creams, and precision casting. − …”