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System and method of pressure swing rectification separation of ethyl acetate and normal hexane azeotropic system

A technology of ethyl acetate and pressure swing rectification, which is applied in chemical instruments and methods, distillation purification/separation, carboxylate preparation and other directions, can solve the problems of increasing production costs and high energy consumption, and reduce production costs and energy consumption. , The effect of high product recovery rate and simple operation process

Pending Publication Date: 2017-08-04
YANGTZE NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a system for pressure swing rectification to separate ethyl acetate and n-hexane azeotropic system, and correspondingly provides a separation method, aiming at avoiding the influence of the addition of the third component Product quality, increased production costs and excessive energy consumption

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  • System and method of pressure swing rectification separation of ethyl acetate and normal hexane azeotropic system
  • System and method of pressure swing rectification separation of ethyl acetate and normal hexane azeotropic system

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Embodiment 1

[0056] The mixed solvent sampled by a pharmaceutical factory was analyzed. The composition of the waste solvent was 30% to 70% n-hexane. The system and method of the present invention are used to process the waste solution of ethyl acetate and n-hexane of the company.

[0057] Use as figure 1 The pressure swing distillation shown in the system for separating ethyl acetate and n-hexane azeotropic system for separation, the specific steps are as follows:

[0058] 1) Atmospheric distillation: the waste solution of ethyl acetate and n-hexane (temperature 25℃, flow rate 1000kg / h, pressure 1atm (absolute pressure), 30% n-hexane, 70% ethyl acetate) enter atmospheric pressure The tower (the first distillation tower T1) performs a rectification, and its operating parameters are as follows: the operating pressure is 1atm (absolute pressure), the number of theoretical plates is 20, and the feed position is the 9th block (counting downwards and upwards, below The same number method), the refl...

Embodiment 2

[0062] Using the same system and method as the embodiment, the different parameters are:

[0063] In step 1): the temperature of the waste solution of ethyl acetate and n-hexane is 25°C, the flow rate is 1000 kg / h, the pressure is 1 atm (absolute pressure), containing 60% n-hexane and 40% ethyl acetate. The operating parameters of the atmospheric tower are: the operating pressure is 1atm (absolute pressure), the number of theoretical plates is 20, the feed position is 10, the reflux ratio is 2.0, the top temperature is 65.2℃, and the bottom temperature of the atmospheric tower is 81.2°C.

[0064] In step 2): the operating parameters of the pressurized tower are: the operating pressure is 5atm (absolute pressure), the number of theoretical plates is 25, the feed position is 11, the reflux ratio of the pressurized tower is 3.0, and the top temperature of the tower is 124.5°C, The temperature at the top of the pressurizing tower T2 is 132.8°C. The position of the feed plate for circ...

Embodiment 3

[0067] Using the same system and method as the embodiment, the different parameters are:

[0068] In step 1): the waste solution of ethyl acetate and n-hexane has a temperature of 25°C, a flow rate of 1000 kg / h, a pressure of 1 atm (absolute pressure), 70% n-hexane and 30% ethyl acetate. The operating parameters of the atmospheric tower are: the operating pressure is 1atm (absolute pressure), the number of theoretical plates is 20, the feed position is 11, the reflux ratio is 2.5, the top temperature is 65.2℃, and the bottom temperature of the atmospheric tower is 81.2°C.

[0069] In step 2): the operating parameters of the pressurized tower are: the operating pressure is 7atm (absolute pressure), the number of theoretical plates is 25, the feed position is 13, the reflux ratio of the pressurized tower is 2.5, and the top temperature of the tower is 140.0°C, The temperature at the top of the pressurizing tower was 148.8°C. The position of the feed plate of the circulating distill...

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Abstract

The invention discloses a system and a method of pressure swing rectification separation of an ethyl acetate and normal hexane azeotropic system. The system comprises a first rectification tower and a second rectification tower. The first rectification tower performs primary rectification on waste liquor of the azeotropic system formed by ethyl acetate and normal hexane at normal pressure and discharges an ethyl acetate liquid from the bottom; steam flows back through a first condenser and a first reflux pump and raw materials are conveyed to the second rectification tower; N tower plates are arranged in the second rectification tower, and a normal hexane liquid is discharged from the bottom of the second rectification tower; and top steam flows back through a second condenser and a second reflux pump and a reflux liquid is conveyed to the first rectification tower. The method comprises the following steps: firstly separating ethyl acetate from the raw materials in the first rectification tower at 1atm, wherein the temperature of the mixed solution is 25 DEG C and the mass ratio of ethyl acetate to normal hexane is (7-3): (3-7); and then separating normal hexane from the second rectification tower at 5-7atm. According to the system and method disclosed by the invention, the quality of a product is prevented from being affected by introducing a third component, so that the production cost and energy consumption are lowered.

Description

Technical field [0001] The invention belongs to the field of chemical distillation and purification, and specifically relates to a system and method for separating ethyl acetate and n-hexane azeotropic system by variable pressure distillation. Background technique [0002] Both ethyl acetate and n-hexane are important chemical raw materials. Ethyl acetate, also known as ethyl acetate, has good solubility and quick-drying properties. It is widely used in coatings, inks, medicine, perfume and other fields, mainly used as adhesives, extractants, and extractants. Hexane is mainly used as a solvent in industry and is widely used in rubber, paint, coating, artificial leather and pharmaceutical fields. In the pharmaceutical industry, ethyl acetate and n-hexane are widely used as solvents, and waste solutions of ethyl acetate and n-hexane are often formed in the actual production process. In order to reduce production costs and environmental pollution, it needs to be recycled and reuse...

Claims

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Application Information

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IPC IPC(8): C07C67/54C07C69/14C07C7/04C07C9/15
CPCC07C7/04C07C67/54C07C69/14C07C9/15Y02P20/10
Inventor 吕利平李航张淑琼孙诗瑞周麒麟徐健华封享华万邦江
Owner YANGTZE NORMAL UNIVERSITY
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