Method for separating methyl acetate and methanol water solution through multistage cross flow liquid-liquid extraction

A methanol aqueous solution, methyl acetate technology, applied in chemical instruments and methods, carboxylate preparation, organic compound preparation and other directions, can solve the problems of complex process technology, high energy consumption, large waste water discharge, etc., achieve high purity, The effect of low energy consumption and low cost

Inactive Publication Date: 2011-01-26
NANJING NORMAL UNIVERSITY
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditionally, in industrial production, azeotropic distillation with water is used to form a water azeotrope containing 96.5% (wt%) of methyl acetate, and then dehydration is performed using a desiccant, or a base and salt compound that forms crystals with water, and 99.5% For the above methyl acetate, the process technology is more complicated, the energy consumption is high in the recycling process of alkali and salt, and the waste water discharge is larger

Method used

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  • Method for separating methyl acetate and methanol water solution through multistage cross flow liquid-liquid extraction
  • Method for separating methyl acetate and methanol water solution through multistage cross flow liquid-liquid extraction

Examples

Experimental program
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Embodiment 1

[0019] refer to figure 1 The process flow shown, using 3-stage cross-flow liquid-liquid extraction to separate methyl acetate and methanol aqueous solution, raw material is 20kg methyl acetate and methanol aqueous solution (containing 84% methyl acetate, 14% methanol and <1% water), extractant S is a mixed solvent of ethylene glycol and water, wherein the ratio of ethylene glycol: water is 1:0.25, and the dosage of each stage of extractant S1~S3 is 20kg respectively.

[0020] Under normal temperature conditions, press figure 1 As shown in the process flow, the raw material F or the raffinate phase R1, R2 enters the extractors I, II, and III in sequence, and is fully stirred with the extraction agent ethylene glycol and water mixed solvent, and the layers are left to separate, and the extraction phase (E1~E3) and The raffinate phase (R1~R3) reaches equilibrium in each stage of extractor. The process conditions that the extractor adopts in the separation process are shown in T...

Embodiment 2

[0028] It is basically the same as Example 1, except that the amount of extractants S1-S3 is 30, 20 and 10 kg respectively.

Embodiment 3

[0030] It is basically the same as in Example 1, except that the polyhydric alcohol in the extractant is changed to propylene glycol, and it is subjected to 4-stage cross-flow extraction. The amount of extractant for each stage is 20kg, in which propylene glycol: water is 1:0.25. After four-stage cross-flow liquid-liquid extraction of methyl acetate and methanol aqueous solution, propylene glycol is not included in the raffinate phase, the mass percentage of methyl acetate reaches 99.70%, and the yield reaches 97.3%.

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Abstract

The invention relates to a method for separating methyl acetate and a methanol water solution through multistage cross flow liquid-liquid extraction, which comprises the following steps of: carrying out multistage cross flow liquid-liquid extraction on methyl acetate and the methanol water solution as raw materials by using a mixed solvent of polyalcohol and water as an extracting agent; rectifying the extract residue phase to obtain the product of methyl acetate; and recycling the extract phase subjected to rectification. The separation method of multistage cross flow liquid-liquid extraction can be used for effectively separating the mixture of methyl acetate and the methanol water solution, the purity of methyl acetate reaches more than 99.7% for one-time extraction, and the yield reaches more than 97%. The product of methyl acetate has high purity and low material consumption and energy consumption, and the entire process has low cost and can not produce environmental pollution.

Description

technical field [0001] The invention relates to an extraction and separation process of methyl acetate and methanol aqueous solution, in particular to a method for multistage cross-flow liquid-liquid extraction and separation of methyl acetate and methanol aqueous solution. Background technique [0002] Methyl acetate is an important chemical raw material and solvent. It is widely used as a solvent for nitrocellulose, cellulose acetate, camphor, oil, wax, gum, and various natural resins. In the production process of chemical products, it is mainly used as acetic anhydride, spices, and drugs. And fuel raw materials, react with ammonia or dimethylamine to produce acetamide and dimethylamide products, and transesterify with alcohol to produce a series of acetates, which are used as high-grade solvents and fragrances. At present, there are more than 20 large and medium-sized enterprises producing methyl acetate in my country, with an annual output of about 290,000 tons. With the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/14C07C67/58
Inventor 顾正桂曹宇锋
Owner NANJING NORMAL UNIVERSITY
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