Regeneration method for waste active carbon in itaconic acid decoloring step

Abstract

The invention relates to a regeneration method for waste active carbon in an itaconic acid decoloring step, wherein the total cost, the regeneration rate and the economic benefit are relatively high. The method comprises the following steps: treating the undried waste active carbon in a reaction kettle, a separator, a distillation column and a regeneration kettle; and thermally decomposing pigments and other impurities through strict temperature control to realize the regeneration of the waste active carbon. According to the regeneration method provided by the invention, an ethanol solution is used as an extracting agent; the ethanol solution has a high selectivity on itaconic acid and the pigments are nearly not washed out; the extracting agent can be used for recovering itaconic acid by way of recrystallization; and the active carbon is fully regenerated, so that no secondary pollution is caused. The method provided by the invention can be used for thermally decomposing the pigments and other impurities at a relatively low temperature, and is low in energy consumption, small in carbon loss and high in regeneration rate.

Description

【Technical field】

[0001] The invention relates to a waste activated carbon regeneration technology, in particular to a regeneration method for treating waste activated carbon in the decolorization process of itaconic acid. 【Background technique】

[0002] Itaconic acid and its esters are important industrial raw materials for the production of chemical fibers such as acrylic fibers, synthetic resins, plastics, rubber, drugs, surfactants, non-toxic food packaging materials, herbicides, latex, descaling agents, adhesives, etc. Widely used in chemical, pharmaceutical, paper, textile, printing and other fields. The production methods of itaconic acid include fermentation and chemical synthesis. Among them, the production process of fermentation method has matured and has become a method commonly used at home and abroad. The fermentation method mainly uses cheap sugar and other agricultural and sideline products as fermentation raw materials, and the fermentation liquid can be o...