Production process of montan wax

Abstract

The invention discloses a production process of montan wax, adopting mixed solvent of cyclohexane and alcohol. The production process comprises the following steps: smashing and screening lignite, putting coal particles of lignite into an extraction tank, putting mixed solvent in a volume ratio of solid to liquid of 1:1 to 1:4 for extraction and flash evaporating the extracted solution to recoverthe solvent; evaporating residual mixed solvent by a stewing system to obtain crude montan wax; vapor condensing the evaporated mixed solvent by a heat exchanger, then separating oil and water, and feeding upper-layer cyclohexane to a solvent feed tank; and separating tertiary butanol in lower-layer liquid from water by a rectification method, and introducing the separated tertiary butanol into the solvent feed tank; detecting the content of cyclohexane or tertiary butanol in the solvent feed tank, supplementing pure cyclohexane solvent and pure tertiary butanol solvent to lead the proportionof the two solvents to meet requirements, and then using the two solvents continuously. The extraction solvents of the production process have safety and reliability, simple extraction process, high wax yield, economy and environment protection, high reuse rate of solvents and low cost, thereby having wide practicability.

Description

[0001] This application is a divisional application of the application of "Montan Wax Extraction Solvent and Production Process", with the filing date: 2007.2.1; technical field [0002] The invention relates to a production process of montan wax. Background technique [0003] Montan wax generally refers to a mixture of complex compounds obtained by extracting lignite with organic solvents. Montan wax and its processed products cannot be replaced by any natural wax or synthetic wax at present, and are an indispensable and important chemical product in the current national economy. For the solvent used for montan wax extraction, toluene was used internationally in the 1980s, but it is unknown which solvent is currently used due to technical secrecy. Domestic montan wax enterprises (mainly Inner Mongolia Wudan Wax Factory and Yunnan Xundian Wax Factory) have been using the traditional organic solvent benzene, which has the following problems: [0004] (1) Benzene is a flamma...

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Problems solved by technology

[0004] (1) Benzene is a flammable, explosive, poisonous and harmful substance, and the extraction process is operated at a relatively high temperature close to its boiling point, with a large amount of volatilization, which is very harmful to the body of the operator and the surrounding environment;

[0005] (2) The selectivity of benzene to wax is not ideal, the content of resin and asphalt in the extracted montan wax is higher, and the crude wax quality of extraction is lower;

[0006] (3) The benzene solvent remaining in the montan wax limits the field of use of the product

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