Complexation method for extracting pyrrolidone or its dissolved substance in organic dilute aqueous solution

A technology of pyrrolidone and methylpyrrolidone, which is applied in the direction of extraction water/sewage treatment, organic chemistry, etc., can solve the problems of poor extraction effect and high energy consumption

Inactive Publication Date: 2005-10-26
上海洁申实业有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because it is easy to form hydrogen bonds with water (hydrophilicity), the extraction effect of conventional solvents is poor; if it is recovered by direct distillation, all the water is evaporated to recover a small amount of organic matter, and the energy consumption is too large; because the liquid also contains soluble oligomers The substances are not included in the scope of adsorption treatment

Method used

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  • Complexation method for extracting pyrrolidone or its dissolved substance in organic dilute aqueous solution

Examples

Experimental program
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Effect test

Embodiment 1

[0025] use figure 1 The flow process of a certain electronic industrial factory handles the organic dilute aqueous solution. The composition of the organic dilute aqueous solution is shown in Table 1. The extract is a mixture of 65Wt% heptanoic acid, 8Wt% oleic acid and 27Wt% kerosene. The weight ratio of the extract and the organic dilute aqueous solution is 5:3, extraction temperature 50°C, pH=6;

[0026] Send the dilute organic aqueous solution containing N-methylpyrrolidone or its compatible substance into the complexation reaction tower 1 from the middle, send the extract into the complexation reaction tower 1 from the top, and then send the complexation extraction product at the bottom of the tower into the Stripping tower 2, the raffinate water at the top of the tower is discharged;

[0027] (2) The complex extraction product sent into the stripping tower 2 is in the stripping tower, and pyrrolidone or its compatible substance is sent to the subsequent workshop section...

Embodiment 2

[0030] The composition of certain electronic industry factory organic dilute solution is shown in Table 2, adopts the complex extraction method of the present invention, and extract is the mixture of 50Wt% heptanoic acid, 5Wt% oleic acid and 45Wt% kerosene, and the weight ratio of extractant and dilute aqueous solution is 5:1, the extraction temperature was 60°C, pH=7.5, the others were the same as in Example 1, and the results are shown in Table 3.

[0031] Composition (weight)%

[0032] Example 1

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Abstract

The present invention discloses a method for recovering pyrrolidone and its solutrope from organic dilute solution by utilizing complexation extraction process. The organic dilute solution not only contains N-methyl pyrrolidone, but also contains C2, C3 alcohol, ethyl acetate and butyl acetate, also contains small quantity of oligopolymer, their total content is 5.0 wt%. Said invention uses Lewis organic acid or Lewis organic alkali as extracting agent, under the condition of that temperature is 15-50 deg.c, solvent-liquid ratio is 5:1-3 and pH value is 5.0-7.5 makes respective extraction, and under the condition of that the temperature is 70-210 deg.C, pH is 2.0-3.5 and pressure is 0.05-0.1 MPa makes back-extraction, the recovery rate of pyrrolidone and its solutrope in the organic dilute solution can be up to 60-90%.

Description

technical field [0001] The invention relates to a method for separating and extracting pyrrolidone and its compatible substances in organic dilute solutions, in particular to a method for recovering waste N-methylpyrrolidone dilute solutions produced in the production process of the electronic industry by complex extraction. Background technique [0002] Dilute organic solution generally refers to wastewater with a mass fraction <5%. If it is not recycled or handled properly, it will not only cause economic losses, but also pollute the environment. [0003] The dilute solution involved in the present invention is the waste N-methylpyrrolidone (NMP for short, the same below) class water dilute solution produced in the electronic industry production process, containing N-methylpyrrolidone or N-methylpyrrolidinol, N -Methylpyrrolidinate, wherein, N-methylpyrrolidone, N-methylpyrrolidinol, and N-methylpyrrolidinate are organic raw materials with a wide range of uses, and are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D207/12
Inventor 朱龙德周霞萍任冠明曹建勤陈卫国
Owner 上海洁申实业有限公司
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