Process for recovering chromium from waste liquid of vitamin K3 production

Abstract

The invention provides a method for reclaiming chrome from the waste solution used for producing vitamin K3, the steps of which comprises that: firstly, the waste solution is distilled to dry at the temperature of 97 DEG C to 100 DEG C and the solution is reclaimed, so as to obtain the residue containing chrome which is then smashed to 200 to 300 meshes and then calcined or micro-waved in a macro wave oven at the temperature of 400 DEG C to 950 DEG C, so as to obtain chromic oxide with high purity, wherein, the main component of the waste solution is chromic acetate aqueous solution. The method of the invention has the advantages of simple process, easy operation and low reclaiming cost; the rate of recovery can reach 100 percent and the purity of the reclaimed chromic acetate is as high as 98.9 percent to 99.9 percent; the reclaimed chromic acetate aqueous solution can be used in reproduction, thus achieving zero release, thereby greatly reducing the production cost of vitamin K3. The method of the invention is applicable to the reclaiming of the waste solution when adopting 2-methyl naphthalin by oxidation of chromic anhydride/acetic acid to produce the intermediate product of 2-methyl naphthoquinone in the production process of the vitamin K3.

Description

Method for recovering chromium from waste liquid producing vitamin K3 technical field The invention relates to a method for recovering waste liquid in the synthesis of chemical substances, in particular to a method for recovering chromium from waste liquid for producing vitamin K3. Background technique Vitamin K3 is a common hemostatic drug, mainly used to prevent internal bleeding in humans or animals, and has a wide range of uses in medicine, feed additives and food. 2-Menaphthoquinone is an important intermediate for the synthesis of vitamin K3 and its vitamin K3 series vitamins. At present, a kind of method of synthesizing 2-menaquinone is to adopt potassium dichromate / sulfuric acid oxidation method, and the chromium sulfate waste liquid that this method produces is difficult to handle, one, adopts electrolytic oxidation method, the Cr3 in waste liquid Oxidized to Cr6, and then applied. This method consumes a lot of electricity, and the high voltage in the production...

AI Technical Summary

Problems solved by technology

Because the waste liquid of this method can't be handled all the time