Method for using carvone production wastewater for recycling acetone oxime

Abstract

The invention discloses a method for reclaiming acetone oxime from carvone production wastewater. The method comprises the following steps: firstly, reclaiming of an extractant, namely collecting 120-150 DEG C / 2mmHg after-cut under the condition of rectification during carvone production as the extractant, wherein the mass content of the carvone is less than 0.5 percent; secondly, extraction of the wastewater, namely mixing the wastewater containing the acetone oxime and the extractant according to the weight ratio of 3.4-3.8:1, raising the temperature to be between 40 and 50 DEG C, stirring for 30 to 45 minutes, cooling the mixture to the room temperature, performing standing and delamination, re-extracting a water phase until reaching the standards, introducing the water phase into a wastewater purification treatment system, and reclaiming the acetone oxime from an organic phase, wherein the mass content of the acetone oxime in the water phase is less than 1.5 percent; thirdly, rectification, namely performing vacuum rectification on the organic phase, and collecting 80-85 DEG C / 300mmHg acetone oxime cut fractions; and fourthly, recrystallization, namely dissolving the acetone oxime cut fractions into water according to the mass ratio of 1.5:1, reducing the temperature to be between 3 and 5 DEG C for crystallization and centrifugal separation, recycling a mother liquor, drying solid under vacuum and obtaining the acetone oxime. The method has simple technique, is convenient to operate and easy in industrial implementation, and changes the prior mode of no products after environment-friendly investment, and has high economic efficiency and social efficiency.

Description

technical field [0001] The invention relates to a method for treating waste water of spice compounds and recovering by-products, in particular to a method for recovering acetone oxime from carvone production waste water. Background technique [0002] Carvone production wastewater is a typical high-concentration organic wastewater, which has the characteristics of high concentration of organic matter, high chroma, difficult biochemical degradation, and complex components. [0003] The general treatment method is to directly use biochemical methods, but the disadvantage is that the components in the wastewater are very complex and contain a large amount of acetone oxime, and acetone oxime has a great inhibitory effect on the growth of most of the bacteria treated by biochemical treatment, so it is difficult to Biochemical degradation, acetone oxime must be recovered before biochemical treatment, the traditional distillation recovery of acetone oxime consumes a lot of energy an...

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Problems solved by technology

[0003] The general treatment method is to directly use biochemical methods, but the disadvantage is that the components in the wastewater are very complex and contain a large amount of acetone oxime, and acetone oxime has a great inhibitory effect on the growth of most of the bacteria treated by biochemical treatment, so it is difficult to Biochemical degradation, acetone oxime must be recovered before biochemical treatment, the traditional distillation method to recover acetone oxime consumes a lot of energy and equipment investment, and the treatment efficiency is low

[0004] Extraction method is one of the physical and chemical treatment methods of wastewater. Most commercial extractants have good extraction performance for aromatic organic compounds with low water solubility, but for highly water-soluble organic compounds with multiple hydrophilic groups in their molecular structure poor extraction

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