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Separation integration system and separation integration method for ethyl acetate-water system

A technology of ethyl acetate and integration method, which is applied in the field of separation and integration system of ethyl acetate-water system, can solve the problems of high energy consumption and complex process, and achieve low energy consumption, simple process, production cost and equipment investment reduction Effect

Active Publication Date: 2017-07-28
TIANJIN TIANDA TIANJIU TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since ethyl acetate and water form an azeotrope under normal pressure, the boiling point of the azeotrope is 70.4°C, and the water content is 6.1wt% during azeotropy. Azeotropic products, but using liquid-liquid extraction, azeotropic distillation, salt extraction and extractive distillation to remove azeotropic water, there are problems such as high energy consumption and complicated process

Method used

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  • Separation integration system and separation integration method for ethyl acetate-water system

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Embodiment 1

[0039] Such as figure 1 Shown, a kind of separation integration system of ethyl acetate and water comprises the ethyl acetate rectification dehydration unit and the ethyl acetate membrane dehydration unit connected with each other by pipelines, and valves are all arranged on each pipeline;

[0040] The ethyl acetate rectification dehydration unit comprises an ethyl acetate dehydration tower 1, a reboiler 2 and a permeate preheater 4; the top and the bottom of the ethyl acetate dehydration tower 1 are respectively provided with a raw material feed port and a permeate liquid feed port; the permeate feed port communicates with the hot side discharge port of the permeate preheater 4, the air inlet at the lower end of the ethyl acetate dehydration tower 1 communicates with the gas phase outlet of the reboiler 2, and the reboiler 2 The liquid phase outlet of the liquid phase is communicated with the feed port on the hot side of the permeate preheater 4; the water outlet at the botto...

Embodiment 2

[0052] The integrated system for separation of ethyl acetate and water described in this example is basically the same as in Example 1, except that the membrane module is a hydrophilic inorganic membrane, specifically a porous alumina-loaded NaA molecular sieve membrane Ethyl acetate dehydration tower 1 has a high-efficiency packed tower and a plate tower composite tower structure, a layer of gas phase distribution tray 13 is set at a distance of 500mm above the permeate feed inlet, and a distance of 500mm below the feed inlet of the water-containing ethyl acetate raw material and the permeate inlet Two layers of feed and liquid receiving trays 14 are arranged at a distance of 500 mm below the feed opening.

[0053] Utilize above-mentioned ethyl acetate and water separation integrated system to separate and integrate the ethyl acetate raw material that water content is 1wt%, to produce the operation method and control condition of the ethyl acetate product that water content is...

Embodiment 3

[0060] The separation and integration system of a kind of ethyl acetate and water described in this embodiment is basically the same as that of Embodiment 2, the difference is that: the membrane module is a hydrophilic organic membrane, specifically polyvinyl alcohol (PVA) / Polyacrylonitrile (PAN) composite membrane.

[0061] Utilize above-mentioned ethyl acetate and the separation integration system of water to separate and integrate the ethyl acetate raw material that water content is 8.1wt%, to produce the operation method and control condition of the ethyl acetate product that water content is 0.1wt% as follows:

[0062] The aqueous ethyl acetate raw material is sent to the raw material inlet at the top of the ethyl acetate dehydration tower 1 after being preheated by the raw material preheater 7, and the preheating temperature of the aqueous ethyl acetate raw material is controlled by adjusting the cooling medium flow rate of the ethyl acetate product condenser 6 At the s...

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Abstract

The invention provides a separation integration system and a separation integration method for an ethyl acetate-water system. The separation integration method for the ethyl acetate-water system comprises an ethyl acetate distillation dehydration unit and an ethyl acetate membrane dehydration unit, wherein the ethyl acetate distillation dehydration unit comprises an ethyl acetate dehydration tower, a reboiler and a membrane separator; the ethyl acetate membrane dehydration unit comprises an ethyl acetate product condenser, a raw material preheater, a dialysate preheater and a dialysate condenser; the ethyl acetate dehydration tower is filled with two materials, namely an ethyl acetate raw material with the water content being 1-15wt%, and dialysate generated in the membrane separation operation process; the dialysate is ethyl acetate containing rich water; through integration operation process of the ethyl acetate distillation dehydration unit and the ethyl acetate membrane dehydration unit, an ethyl acetate product with the water content being 0.03-0.5wt% is prepared. The separation integration method for the ethyl acetate-water system, which is provided by the invention, is simple in process and low in energy consumption, and can lower the production cost.

Description

technical field [0001] The invention belongs to the field of separation and purification of chemical products, and in particular relates to a separation and integration system and a separation and integration method of an ethyl acetate-water system. Background technique [0002] Ethyl acetate is an important chemical raw material with a boiling point of 77.1°C. It can be miscible with most organic solvents such as alcohol, ether, chloroform, acetone, benzene, etc. It has excellent solubility, less toxicity, and faster volatilization. One of the most widely used fatty acid esters is an important industrial solvent. In industrial applications, the product purity of ethyl acetate, especially the water content, is usually required to be higher. Therefore, the refining technology of ethyl acetate products with a water content of ≤0.5wt% has been paid attention to. Since ethyl acetate and water form an azeotrope under normal pressure, the boiling point of the azeotrope is 70.4°C,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/48C07C69/14
CPCC07C67/48C07C69/14Y02P20/10
Inventor 刘宝菊金浩禹侯文贵任洪东张利云
Owner TIANJIN TIANDA TIANJIU TECH CO LTD
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