Method and device for high-efficiency energy-saving desolvation of fossilized animal/plant wax-containing solution

Abstract

The invention discloses a method and a device for high-efficiency energy-saving desolvation of a fossilized animal / plant wax-containing solution. The method provided by the invention comprises the following steps of continuous four-stage evaporation, continuous steam stripping and continuous steaming, wherein the steps are carried out under negative pressure conditions, and realizes recovery of asolvent in non-condensable gas and comprehensive utilization of energy. The device provided by the invention comprises a four-stage evaporator, a stripping tower, a desolvation tower, an auxiliary feed pump, a heater, an economizer and a condenser, wherein the four-stage evaporator, the stripping tower and the desolvation tower are connected to a negative pressure system. The method and the device have the advantages that under negative pressure conditions, the steps of continuous four-stage evaporation, continuous steam stripping and continuous steaming are adopted and waste heat produced bythe steps is utilized fully so that desolvation efficiency is high; a wax heating temperature is low so that improvement of a wax acid value and a wax saponification value is promoted; and multipath recovery of a solvent and non-condensable gas is realized and thorough solvent recovery is realized so that a production cost is reduced greatly.

Description

technical field [0001] The invention belongs to the technical field of coal processing, and in particular relates to a high-efficiency, energy-saving desolventization method and a device thereof for a solution containing fossilized animal and plant waxes with high desolventization efficiency and energy saving. Background technique [0002] At present, the extraction of fossilized animal and plant waxes (such as peat wax, montan wax, and oil shale wax) is done by solvent leaching. Through leaching operations, the fossilized animal and plant waxes in the raw materials are dissolved in the solvent, and then The solvent containing fossilized animal and vegetable waxes is desolvated to obtain fossilized animal and vegetable waxes. In the leaching process, the solvent used to extract wax is recycled. The separation of solvent, wax and coal is an important link, and more than 80% of the solvent is recovered here. Therefore, this process is not only related to solvent consumption. ...

AI Technical Summary

Problems solved by technology

The evaporation process consumes a lot of heat energy. Throughout the leaching process of petrochemical animal and plant waxes at home and abroad, steam is mainly used as the heat source, and steam consumption accounts for a large proportion, sometimes even exceeding one-third of the production cost.

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