System and method for recovering methyl nitrite through coal ethylene glycol carbonyl synthesis system

A coal-to-ethylene glycol and methyl nitrite technology, which is applied in the preparation of nitrite esters, chemical instruments and methods, and the preparation of organic compounds, can solve problems such as water resource pollution, improve economic benefits, and solve large consumption , The effect of reducing waste liquid pollution

Inactive Publication Date: 2017-08-18
安阳永金化工有限公司
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  • Abstract
  • Description
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Problems solved by technology

[0005] The object of the present invention is to overcome the problem of water resource pollution caused by the direct discharge of a large amount of sodium nitrate waste liquid in the coal-to-ethylene glycol production process existing in the above-mentioned prior art, and to provide a method of turning waste into wealth and reducing waste of resources. System and method for recovering methyl nitrite from coal-to-ethylene glycol oxo synthesis system and water source pollution

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  • System and method for recovering methyl nitrite through coal ethylene glycol carbonyl synthesis system

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Embodiment 1

[0027] Coal-to-ethylene glycol carbonylation system to recover methyl nitrite, such as figure 1 As shown, it includes a front gas stripping unit, a nitric acid reduction unit, and a back gas stripping unit. The front gas stripping unit includes a front gas stripping tower liquid phase preheater 1, a front gas stripping tower 2 and a front gas stripping tower kettle liquid discharge Centrifugal pump 3, the upper end of the front stripping tower is provided with a gas phase outlet; the nitric acid reduction unit includes a nitric acid reduction liquid phase heater 4 and a nitric acid reduction reactor 5, and the upper end of the nitric acid reduction reactor is provided with a gas phase inlet; the rear stripping unit includes a flash The steaming tank 6, the liquid phase feed pump 7 of the rear stripping tower and the rear stripping tower 9; the liquid phase preheater of the front stripping tower is connected to the upper inlet of the front stripping tower through the liquid phase...

Embodiment 2

[0039] A method for recovering methyl nitrite from a coal-to-ethylene glycol carbonylation synthesis system. The method includes: the esterification reaction liquid in the ethylene glycol production process is sent to the liquid phase preheater of the front stripping tower through a pipeline, and preheated After reaching 60~80℃, the liquid enters the top of the front stripper through the upper inlet of the front stripper through the pipeline and is sprayed. The gas phase supplemented at the bottom of the front stripper is in reverse contact with the packing layer. The gas phase containing methyl nitrite at the top of the tower is returned to the synthesis system as a supplement; the contacted liquid enters the nitric acid reduction liquid phase heater through the centrifugal pump of the kettle liquid discharge of the front stripping tower, and is sent to the top of the nitric acid reduction reactor after heating , Make co-current contact with the gas phase supplemented at the to...

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Abstract

The invention relates to the field of coal ethylene glycol chemical engineering and particularly relates to a system and method for recovering methyl nitrite through a coal ethylene glycol carbonyl synthesis system. According to the method, the main target of effectively recovering a methyl nitrite gas is achieved in the coal ethylene glycol carbonyl synthesis system through the methods of combining air stripping, flash evaporation and nitric acid reduction. The recovery system mainly comprises a front air stripping system for methyl nitrite, a nitric acid reduction system and a rear air stripping system, wherein the front air stripping system is provided with a liquid-phase preheater, a front air stripping tower and a liquid-phase discharge centrifugal pump; the nitric acid reduction system is provided with a liquid-phase feeding preheater and a nitric acid reduction tower; and the rear air stripping system is provided with the flash evaporation tank, the liquid-phase feeding centrifugal pump and the rear air stripping tower. Stable content of nitric oxide and the methyl nitrite in a gas-phase component of the synthesis system is ensured through the method of combining a physical process and chemical reaction, the losses of the nitric oxide and the methyl nitrite are avoided to a great extent, the waste is changed into treasure, and resource waste and water source pollution are reduced.

Description

Technical field [0001] The invention relates to the field of coal-to-ethylene glycol chemical industry, in particular to a system and method for recovering methyl nitrite in a coal-to-ethylene glycol carbonylation synthesis system. Background technique [0002] Ethylene glycol is an important chemical raw material, mainly used as a raw material for solvents, antifreeze and synthetic polyester resins. At present, ethylene glycol is mainly prepared by direct hydration of ethylene oxide. Since the production of ethylene oxide is based on ethylene, mass production mainly depends on petroleum resources. The general energy characteristics of our country are rich in coal, gas, and less oil. Therefore, the efficient conversion of coal into chemical raw materials such as ethylene glycol reduces the dependence of chemical raw materials on petroleum resources, which is beneficial to optimize the energy and resource structure and is of great significance. . [0003] In recent years, with th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/74C07C29/76C07C29/80C07C29/88C07C31/20C07C201/04C07C203/00
CPCC07C29/74C07C29/76C07C29/80C07C29/88C07C201/04C07C31/202C07C203/00
Inventor 郜善军安东亮李金金陈帅
Owner 安阳永金化工有限公司
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