A kind of regeneration method of deactivated activated carbon in paracetamol refining stage

Abstract

The invention relates to a regeneration method of inactivated activated carbon in a refining stage of acetaminophen. The method comprises an alcohol-alkali desorption stage, a water scrubbing stage, an acid pickling stage and a drying and activating stage. The method has the characteristics of low regeneration cost, simple operation, high regeneration rate, and high economic benefits; almost no carbon is loss in the regeneration process and mechanical property of the activated carbon is not damaged in the regeneration process; the solvent can be recycled for many times and causes no secondarypollution; and the regenerated activated carbon can adsorb 250-285mg / g of methylene blue, and meets the process requirement of the refining and impurity removal stage of acetaminophen on the activatedcarbon.

Description

technical field [0001] The invention relates to a regeneration process of waste activated carbon, in particular to a regeneration method for activated carbon in the purification and impurity removal process of acetaminophen. Background technique [0002] Acetaminophen, also known as paracetamol, is commonly used as an antipyretic and pain reliever. The current world consumption is about 150,000 tons. The activated carbon used in the production and refining process of acetaminophen is about 10% of the product volume. The deactivated activated carbon adsorbs a large amount of phenolic substances (mainly acetaminophen and acetaminophen dimer, etc.), if Landfill treatment will cause secondary pollution, so the deactivated activated carbon becomes hazardous solid waste and cannot be discharged at will; and the cost of activated carbon is high, if it is used once and incinerated, the cost of use will be high, and it will also cause resource waste. Waste, so manufacturers usually ...

AI Technical Summary

Problems solved by technology

The activated carbon used in the production and refining process of acetaminophen is about 10% of the product volume. The deactivated activated carbon adsorbs a large amount of phenolic substances (mainly acetaminophen and acetaminophen dimer, etc.), if Landfill treatment will cause secondary pollution, so the deactivated activated carbon becomes hazardous solid waste and cannot be discharged at will; and the cost of activated carbon is high, if it is used once and incinerated, the cost of use will be high, and it will also cause resource waste. waste, so producers usually recycle it

[0003] At present, the activated carbon regeneration methods used at home and abroad are: (1) thermal regeneration: using the characteristics that the adsorbate can be decomposed from the pores of activated carbon at high temperature, the adsorbate is desorbed at high temperature, so that the blocked pores are opened and the adsorption is restored. Performance, the process technology is relatively mature, but there are disadvantages such as large regeneration energy consumption, large carbon loss in the regeneration process, and performance decline after regeneration; (2) Chemical regeneration method: use some specific chemical reagents to desorb or decompose the adsorbate , so as to restore the adsorption performance of activated carbon. This method has low regeneration loss and simple regeneration equipment, but this method is highly targeted, and improper treatment of the desorbent will cause secondary pollution; (3) Microwave regeneration method: high temperature is generated by microwave radiation. A method of carbonizing and activating organic matter to restore its adsorption capacity. This method has low energy consumption and uniform heating, but the carbon performance drops seriously after multiple regenerations; (4) Other regeneration methods: biological regeneration method, wet oxidation catalytic method, Photocatalytic regeneration method, ultrasonic regeneration method and supercritical fluid regeneration method, etc.