Glycerin secondary decolorization method

Abstract

The invention discloses a two-time glycerol decoloring method which is operated according to the following steps: 1, adding glycerol which is not decolored and active carbon to a 1# decoloring pot for primary decoloration; 2, pumping the glycerol into a 1# filter press through a 1# pump after the primary decoloration, and adding the active carbon to a 2# decoloring pot for secondary decoloration, wherein the primarily decolored glycerol obtained through pressure filtration flows into the 2# decoloring pot; regularly cleaning waste active carbon inside the 1# filter press; and 3, pumping the secondarily decolored glycerol into a 2# filter press through a 2# pump for the pressure filtration to obtain finished glycerol, recovering all the active carbon inside the 2# filter press, and complementally adding the active carbon to the 1# decoloring pot. The two-time glycerol decoloring method disclosed by the invention has the characteristics of small active carbon usage amount, good decoloring effect and low production cost.

Description

technical field [0001] The invention relates to a processing method of glycerin, an organic chemical product, in particular to a method for decolorizing glycerin. Background technique [0002] With the popularization and promotion of the industrial production and application of biodiesel, the production of its by-product crude glycerol has also increased rapidly. In the process of biodiesel production, on average, 0.05-0.1 tons of crude glycerin can be produced by producing 1 ton of biodiesel; domestic biodiesel In order to reduce production costs, manufacturers generally use waste oils (such as waste oil, hog oil, plant acidified oil, etc.) as the main raw material to produce biodiesel. Problems such as low purity, many impurities, and complicated treatment require purification, evaporation, distillation, deodorization, and decolorization to make the produced glycerin meet the requirements of national standards. One of the important indicators, the color of glycerin directl...

AI Technical Summary

Problems solved by technology

At present, the decolorization method of glycerin generally uses activated carbon adsorption treatment to reduce the color of glycerin. Activated carbon is a porous carbon material made of carbon-containing organic matter through carbonization and activation processes. It is an excellent non-polar adsorbent. Pigment molecules with small properties have better selective adsorption, can adsorb polymer substances, and are particularly effective in removing red and green pigments; at present, the production equipment of this method is mainly composed of a decolorization tank and a filter press , the specific operation method is: add undecolorized glycerin and activated carbon into the decolorization tank, stir at a certain temperature and then send it to the filter press by a pump, and the glycerin after pressure filtration flows into the receiving tank, and regularly cleans the filter press for use. activated carbon; this decolorization method has the defects of large amount of activated carbon, darker glycerin color and high production cost

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