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Method for extracting methanol from methyl methacrylate-methanol mixing solution

A technology of methyl methacrylate and mixed solution, which is applied in the preparation of carboxylate, chemical instruments and methods, preparation of hydroxyl compounds, etc., can solve the problems of unclearness, slow stratification of two phases, inversion, etc., and achieves a simple process. , less water, high efficiency

Inactive Publication Date: 2016-11-16
朱凌霄
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the methanol content is 30%, at least 5 times the amount of clear water of the mixed solution is required to have a sufficient density difference, otherwise the density difference between the water phase and the oil phase will be very small or even smaller than the oil phase density, which will cause the two phases to separate The layers are slow, unclear or even reversed, that is, the oil phase is in the lower layer and the water phase is in the upper layer, and the water phase is difficult to recycle, resulting in a large amount of waste water

Method used

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  • Method for extracting methanol from methyl methacrylate-methanol mixing solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Get 2000L methanol content and be 10%, the MMA-methanol mixed solution (1856kg) of moisture content 5%, density is 0.928g / ml, add the brine 408kg that density is 1.122g / ml for the first washing, leave standstill 20min after stirring for 20min, 668L (687kg) of the water phase was discharged, and the density was 1.030g / ml; the content of methanol in the oil phase was 4.6%. For the second wash, 316 kg of brine with a density of 1.122 g / ml was added, stirred for 20 min and then left to stand for 20 min to release 317 (347 kg) L of water phase with a density of 1.090 g / ml and a methanol content of 1.2% in the oil phase. Add demineralized water 201kg for the third wash, leave standstill for 30min after stirring for 20min, emit 245L of water phase, density is 0.990g / ml; obtain 1501kg of oil phase (MMA), wherein the content of methanol is 0.5%, moisture 1.0%, the product is qualified , and the recovery rate was 94%. The total amount of the combined aqueous phase is 1230L, and ...

Embodiment 2

[0027] Get 2000L methanol content and be 30%, the MMA-methanol mixed solution (1798kg) of moisture 7%, density is 0.899g / ml, the first water washing adds the brine 1187kg that density is 1.121g / ml, after stirring 20min, let stand for 20min, 1825L (1875kg) of the water phase was discharged, and the density was 1.030g / ml; the content of methanol in the oil phase was 4.8%. For the second wash, 222 kg of brine with a density of 1.121 g / ml was added, stirred for 20 min and then allowed to stand for 20 min to release 223 L (244 kg) of the aqueous phase with a density of 1.090 g / ml and a methanol content of 2.3% in the oil phase. Add 109kg of demineralized water for the third wash, stir for 20min and then let stand for 30min to release 135L of water phase with a density of 0.990g / ml; It was 0.990g / ml; 1055kg of oil phase (MMA) was obtained, wherein the content of methanol was 0.4%, the moisture content was 0.9%, the product was qualified, and the recovery rate was 92%. The total amo...

Embodiment 3

[0029] Get 2000L methanol content and be 48%, the MMA-methanol mixed solution (1738kg) of moisture content 2%, density is 0.869g / ml, add the brine 1836kg that density is 1.120g / ml for the first washing, leave standstill 20min after stirring 20min, 2666L (2740kg) of the water phase was discharged, and the density was 1.030g / ml; the content of methanol in the oil phase was 4.8%. Add 167kg of brine with a density of 1.120g / ml for the second wash, stir for 20min and let stand for 20min to release 168L (184kg) of the water phase with a density of 1.090g / ml and a methanol content of 2.0% in the oil phase. Add 106kg of demineralized water for the third wash, stir for 20min and then let it stand for 30min to release 132L of water phase with a density of 0.990g / ml; It was 0.991g / ml; 793kg of oil phase (MMA) was obtained, wherein the content of methanol was 0.5%, the moisture content was 0.8%, the product was qualified, and the recovery rate was 90%. The total amount of the combined aq...

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Abstract

The invention belongs to the technical field of separation and purification of mixtures, and particularly relates to a method for extracting methanol from a methyl methacrylate-methanol mixing solution. The method comprises: extracting a methyl methacrylate-methanol mixing solution by using salt water; extracting with demineralized water to obtain a qualified methyl methacrylate product; and distilling the water phase produced during the extraction process to obtain the water-containing methanol and the salt water. According to the present invention, the process is simple, and the further treatment on the oil phase to separate the organic solvent is not required so as to avoid the introduction of the impurity; less water is required and the efficiency is high; and it is particularly important that the methanol in the recovered water phase and the added demineralized water are distilled, such that the remaining salt water can be recycled, and the waste water is not substantially produced during the production process.

Description

technical field [0001] The invention belongs to the technical field of mixture separation and purification, and in particular relates to a method for extracting methanol from methyl methacrylate-methanol mixed liquid. Background technique [0002] Methanol is produced during the production of glycidyl methacrylate. [0003] [0004] In order to make the reaction proceed to the right, the amount of the reactant MMA is 4-10 times that of the other reactant glycidol, and methanol needs to be extracted continuously, and a considerable amount of MMA will be extracted together during the extraction process. , in order to reuse MMA, the MMA-methanol mixture needs to be treated to remove methanol. [0005] At present, in industrial production, two methods of n-hexane and water double solvent extraction and single extraction with a large amount of clear water are usually used to separate MMA-methanol. When using dual-solvent extraction, it is necessary to separate n-hexane in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/86C07C29/80C07C31/04C07C67/58C07C69/54
CPCC07C29/86C07C29/80C07C67/58C07C31/04C07C69/54
Inventor 朱虎袁文学谭长青鲁光耀于子珍
Owner 朱凌霄