Wastewater complex extraction

Relevant information and materials can be found by searching on forums: 1. Experience in the industrialization of wastewater complex extraction, such as the extraction and recovery of organic acids (formic acid, acetic acid====), organic sulfonic acids, etc., from wastewater. 2. What is the typical loss amount of the complexing solvent? 3. Are there any viable examples of industrialization?

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Reply to 3# kwang83: That’s correct; they have been working on engineering projects since the 1980s.

I haven’t worked on engineering projects, but I have done experimental research. The loss of the extractant depends mainly on the following factors: First, the solubility of the extractant in water ； Second, the extraction operation conditions, such as separation methods and temperature ； Third, the distribution coefficient of the extractant, that is, the number of extraction stages. Generally speaking, the main economic loss in complex extraction arises from the loss of the extractant. It is mentioned in a paper from Tsinghua University that when the concentration of phenols in wastewater exceeds 1000 g/t of water, the use of triphosphate extractants results in an equilibrium between benefits and losses. Therefore, whether extraction is cost-effective depends on the economic value of the substance to be extracted; if it’s very cheap, then it’s not a good option at all!

Reply to 5# wanghuifeng: Waiting for further updates!

This post was last edited by fangqiong on 2010-10-26 at 15:46. The solubility of the common extractants used in combined extraction is very low, and can basically be ignored. The key to controlling the loss of the extractant lies in controlling emulsification; if emulsification occurs, phase separation becomes poor, and if a large amount of extractant remains in the water, the costs increase.

Reply to 7# kwang83: The solubility of complex extractants is generally low, around several dozen milligrams per liter. Moreover, they are usually quite expensive, such as high-carbon quaternary ammonium salts; therefore, the loss due to dissolution cannot be ignored. As for the emulsification loss, it is mainly determined by operational parameters such as temperature and mixing intensity. For example, low temperatures and high salinity levels can cause the complexing extractant to form a third phase, resulting in significant losses; however, this can be controlled through appropriate process conditions in practical applications.

Phosphorus complexing extractants are generally at several hundred ppm; I have used them in industry for many years. Amine-based extractants tend to form a third phase, and the losses in this regard are much greater than those due to dissolution in water.

What type of phosphorus to use, single-solvent extraction or multiple solvents?

I am a manufacturer of equipment for separating layers during the discharge from reaction vessels. Our company has developed an online auxiliary device for discharge that detects changes in the material during this process and activates the corresponding valves, thereby enabling automation to replace manual operation