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Method with heat integration function for separating ethylene glycol from 1,2-butylene glycol

A technology of ethylene glycol and butanediol, which is applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problem of high energy consumption in the separation process, reduce the number of theoretical plates, increase work efficiency, and reduce losses Effect

Active Publication Date: 2014-03-26
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is the separation of ethylene glycol and 1,2-butanediol in the prior art, especially when separating and purifying ethylene glycol from the liquid phase product of oxalate hydrogenation to ethylene glycol, using common four The problem of high energy consumption in the tower separation process provides a new heat-integrated method for separating ethylene glycol and 1,2-butanediol

Method used

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  • Method with heat integration function for separating ethylene glycol from 1,2-butylene glycol
  • Method with heat integration function for separating ethylene glycol from 1,2-butylene glycol

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Embodiment 1

[0038] use figure 2 In the first kind of heat integration process flow shown, the operating conditions of raw material stream 1, each tower and phase separator are the same as in Example 1, and the purity of ethylene glycol after refining, the value of ultraviolet transmittance and the recovery rate are basically unchanged, and the process The total energy consumption is reduced to 3.113×10 3 KJ / (kg×hour), which is 17.91% lower than the energy consumption of the common four-tower separation process.

[0039]

Embodiment 2

[0041] use image 3 In the second heat integration process shown, the operating conditions of raw material stream 1, each tower and phase separator are the same as in Example 1, and the purity of ethylene glycol after refining, the UV transmittance value and the recovery rate are basically unchanged, and the process The total energy consumption is reduced to 3.052×10 3 KJ / (kg×hour), which is 19.51% lower than the energy consumption of ordinary four-tower separation process.

[0042]

Embodiment 3

[0044] use Figure 4 As shown in the third heat integration process flow, the operating conditions of raw material stream 1, each tower and phase separator are the same as in Example 1, and the purity of ethylene glycol after refining, the UV transmittance value and the recovery rate are basically unchanged, and the process The total energy consumption is reduced to 3.059×10 3 KJ / (kg×hour), which is 19.33% lower than the energy consumption of the common four-tower separation process.

[0045]

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Abstract

The invention relates to a method with a heat integration function for separating ethylene glycol from 1,2-butylene glycol, which is mainly used for solving the problem of high energy consumption existing in the prior art. According to the method disclosed by the invention, a technical scheme adopting a process flow including a first separating tower C1, a second separating tower C2, a third separating tower C3 and a fourth separating tower C4 is used, wherein a part of heat needed by the first separating tower C1 comes from a material flow 7 of the third separating tower 3 and the other part of heat needed by the first separating tower C1 comes from a tower kettle reboiler E0 of the first separating tower C1, and thus the problem is well solved. The method can be applied to industrial production for separating the material flow containing ethylene glycol and 1,2-butylene glycol.

Description

technical field [0001] The invention relates to a heat-integrated method for separating ethylene glycol and 1,2-butanediol, in particular to an energy-saving process for separating and purifying ethylene glycol from the liquid phase product of oxalate hydrogenation to ethylene glycol method. Background technique [0002] Ethylene glycol is an important basic organic chemical raw material, mainly used for copolymerization with terephthalic acid to produce polyethylene terephthalate (PET). In addition, ethylene glycol can also be used in the production of antifreeze, lubricants, plasticizers, non-ionic surfactants and explosives, etc., and has a wide range of uses. my country is a big consumer of ethylene glycol. In recent years, with the completion and operation of a number of large-scale PET plants, the demand for ethylene glycol has increased rapidly. The current domestic ethylene glycol production is far from meeting the demand. In 2010, my country's ethylene glycol produ...

Claims

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Application Information

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IPC IPC(8): C07C31/20C07C29/80C07C29/82
CPCC07C29/80C07C31/202C07C31/207Y02P20/10
Inventor 郭艳姿肖剑
Owner CHINA PETROLEUM & CHEM CORP
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