A kind of esterification reaction wastewater treatment experimental method

Abstract

The invention relates to an experimental method for treating wastewater from esterification reaction. Firstly, the reaction solution required for the experiment is prepared; the wastewater from the esterification reaction in the production of bio-based plasticizers is added to the first reaction pool for treatment; Add FeSO4 7H2O and the wastewater of epoxidation reaction to react in the tank to obtain the reaction mixture, then add the reaction solution for flocculation reaction, take the supernatant for subsequent treatment; add NaOH solution to the second reaction tank, remove the supernatant The iron ions in the solution were stirred evenly, statically precipitated, and the supernatant was taken for the detection of various indicators; the experimental results were recorded. The present invention has the advantages that: the wastewater of esterification reaction and the wastewater of epoxidation reaction are combined and treated, which can effectively reduce the COD value of the wastewater of esterification reaction, and can reduce the COD value of hydrogen peroxide in the wastewater of epoxidation reaction. The concentration is diluted to realize the simultaneous treatment of two waste waters, which is very convenient.

Description

technical field [0001] The invention relates to the field of bio-based plasticizer production, in particular to an experimental method for the treatment of esterification reaction wastewater. Background technique [0002] At present, the production process of the existing bio-based plasticizer is usually as follows: esterification is performed by vegetable oleic acid alcohol to obtain an esterified product, and the esterified product is then subjected to an epoxidation reaction to obtain the desired bio-based plasticizer product. In the above production process, a large amount of waste water will be generated during the esterification reaction and the epoxidation reaction, and the waste water of the esterification reaction will contain esters, alcohols, vegetable oleic acid, etc., in the epoxidation reaction The wastewater will contain 20% hydrogen peroxide, organic acids, etc. The wastewater after the above two reactions cannot be directly discharged, because now the wastew...

AI Technical Summary

Problems solved by technology

In the above-mentioned production process, a large amount of waste water will be produced in the process of esterification reaction and epoxidation reaction, and the waste water of esterification reaction will contain esterified products, alcohol, vegetable oleic acid, etc., during the epoxidation reaction The wastewater will contain 20% hydrogen peroxide, organic acids, etc. The wastewater after the above two reactions cannot be discharged directly, because now there are indicators for wastewater discharge, and exceeding the sewage discharge standard will lead to shutdown of production, so it is necessary Discharge after treatment, and the conventional treatment method is to send the wastewater from the esterification reaction and the wastewater from the epoxidation reaction to different wastewater treatment centers for wastewater treatment before discharging, which is very troublesome

[0003] When treating the wastewater from the esterification reaction, the COD of the wastewater is high, resulting in a small ratio of BOD to COD, poor biochemical properties, difficult to biodegrade, and cannot be treated with activated sludge. Instead, ferrous iron and 30% hydrogen peroxide are used to treat it. In order to reduce the COD value in the wastewater, it is necessary to add acid treatment to the wastewater to reduce the pH value of the wastewater. However, this will make the wastewater contain a high concentration of hydrogen peroxide, which cannot be accurately Control wastewater treatment indicators