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Method for separating methyl acetate-methanol-water by adopting extractive distillation separation method with two-solvent lateral feed

A technology of methyl acetate, extraction and rectification, which is applied in the preparation of carboxylic acid esters, chemical instruments and methods, and the preparation of organic compounds. It can solve the problems of complex processes, high energy consumption, and large waste water discharge, and achieve simple process steps. , low energy consumption and easy recycling

Inactive Publication Date: 2010-12-01
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The traditional industry adopts azeotropic distillation with water to form a water azeotrope containing 96.5% (wt%) of methyl acetate, and then dehydrates with desiccant, or alkali and salt compounds that form crystals with water, and more than 99.5% of acetic acid can be obtained Methyl ester, the process is complex, the recycling process of alkali and salt requires high energy consumption, and the discharge of waste water is relatively large

Method used

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  • Method for separating methyl acetate-methanol-water by adopting extractive distillation separation method with two-solvent lateral feed
  • Method for separating methyl acetate-methanol-water by adopting extractive distillation separation method with two-solvent lateral feed
  • Method for separating methyl acetate-methanol-water by adopting extractive distillation separation method with two-solvent lateral feed

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Experimental program
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Effect test

Embodiment 1

[0023] Embodiment 1: The extraction process and experimental equipment of the two strands of side feed are referred to respectively figure 1 and figure 2 , figure 2 Among them, 7 is the raw material storage tank, 8 is the pump, 9 is the glass rotameter, 10 is the storage tank, 11 is the electric heating jacket, 12 is the tower kettle, 13 is the tower kettle thermometer, 14 is the storage tank, 15 is the pump, and 16 is the storage tank , 17 is the pump, 18 and 19 are glass rotor flowmeters, 20 is glass fiber cotton and jacket, 21 is packing, 22 is return pipe, 23 is return port, 24 is tower top thermometer, 25 is condenser, 26 electromagnetic Great. Using the methyl acetate-methanol-water mixture provided by Yangzi Petrochemical Co., Ltd. as the raw material, it was analyzed by HP chromatography. image 3 In, the composition in the figure is the mass content. The raw material liquid is extracted and separated by two side feed extraction towers, the temperature at the top...

Embodiment 2

[0024] Embodiment 2, refer to figure 1 , figure 2 , using the methyl acetate-methanol mixture (50-55% methyl acetate, 45-50% methanol) provided by Yangzi Petrochemical Company as raw material, the raw material was Figure 5 Middle rectification and extraction are integrated and separated, and more than 99.5% of methyl acetate can be obtained at the top, with a yield of more than 93%. See Figure 5 shown.

Embodiment 3

[0025] Embodiment 3 is basically the same as Embodiment 1, but wherein the extractant adopts S2 water and S1 glycerol; S1:S2=0.5:1.

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Abstract

The invention relates to a method for separating methyl acetate-methanol-water by adopting an extractive distillation separation method with two-solvent lateral feed. The method comprises the following steps of: (1) carrying out two-solvent lateral feed on a methyl acetate, methanol and water mixed solution, carrying out extraction and separation with an extraction agent to obtain the methyl acetate with the mass content of more than 99.8 percent at the tower top, and controlling the temperature at the tower top to be 57.5 to 58.0 DEG C; (2) treating a mixing solution which contains the extraction agent and flows from a tower kettle through a regeneration tower and obtaining the methanol with the mass content of 95 percent at the tower top of the regeneration tower; (3) returning remaining distilling components to use; and (4) circularly using the extraction agent. The extraction agent adopts S2 water and S1 glycerol or ethylene glycol, wherein S1: S2 is equal to 0.5 to 1: 1. Compared with the traditional process, the invention has simple process, convenient recovery of the extraction agent, circular utilization and low energy consumption. The invention can obtain more than 99.8 percent of methyl acetate once with the yield of more than 95 percent and simultaneously obtain more than 95 percent of methanol.

Description

technical field [0001] The invention relates to a process for extracting and rectifying two solvent side streams, in particular to a process for extracting and rectifying separation of methyl acetate-methanol-water system with two streams of side feed, in particular to a process for extracting and rectifying separation of two solvent side feeds Method for separating methyl acetate-methanol-water, and the equipment used in this method. 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....

Claims

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Application Information

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IPC IPC(8): C07C69/14C07C67/54C07C31/04C07C29/84
Inventor 顾正桂林军刘俊华
Owner NANJING NORMAL UNIVERSITY
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