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System for preparing ethylene glycol from ethane via epoxyethane

A technology for hydration of ethylene oxide and ethylene oxide, applied in hydrolysis preparation, organic chemistry, etc., can solve problems such as increased dehydration load of dehydration tower, increased load of evaporation system, coking of dehydration tower reboiler, etc. The effect of coking speed, wall thickness reduction and process simplification

Inactive Publication Date: 2007-08-29
CHINA HUANQIU CONTRACTING & ENG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] 2. The load of the evaporation system brought about by the expansion of the ethylene oxide / ethylene glycol production system:
[0020] In the existing production equipment, the problem of coking in the reboiler of the dehydration tower has greatly affected the load of the dehydration tower and the load of the entire equipment; Correspondingly, a large amount of water is brought in to meet the requirements of increased production capacity, which leads to a large increase in the dehydration load of the dehydration tower. If the load of the whole set of equipment is increased by more than 10%, the coking situation will be more serious, and the number of shutdowns to clean the coke will be more. up
Therefore, the problem of coking in the reboiler of the dehydration tower needs to be solved urgently

Method used

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  • System for preparing ethylene glycol from ethane via epoxyethane
  • System for preparing ethylene glycol from ethane via epoxyethane
  • System for preparing ethylene glycol from ethane via epoxyethane

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Embodiment Construction

[0076] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings. The scope of the present invention is not limited by the specific embodiments, and the scope of the present invention is set forth in the claims.

[0077] As shown in Figure 1, a system for preparing ethylene glycol from ethylene through ethylene oxide provided by the present invention includes an ethylene oxide reaction system, an ethylene oxide hydration reaction system, and an ethylene glycol separation and purification system. The ethylene glycol separation and purification system includes an evaporation system, a vacuum dehydration system and a subsequent purification system.

[0078] As shown in Figure 2, the ethylene oxide reactor in the preparation ethylene glycol system of the present invention comprises reactor housing 1, reaction gas inlet 2, reaction gas outlet 3, liquid inlet 4, liquid outlet 5, and set The reaction tube 6 inside...

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Abstract

The invention provides a system to prepare glycol, which comprises: an oxirane reaction system with a tube-row fixed bed reactor with the tube size within 40~50mm, an oxirane hydration reaction system, a glycol evaporation system with a multi-effect evaporator system in series and a heat exchanger with low-pressure steam as heat source, and a vacuum dewatering system with a pre-heater arranged in front of the tower to heat the feeding solution to or more than its bubble point temperature; Wherein, the reboiler in the evaporation system has tube plate as dual-face composite structure steel plate, basic material layer as carbon steel, tube side composite layer as Monel alloy, and shell side composite layer as stainless steel. This invention takes small land, needs low investment, solves effectively the corrosion protection and coking problems for device, and has well economic benefit.

Description

technical field [0001] The invention relates to a system for producing ethylene glycol, in particular to a system for preparing ethylene glycol from ethylene through ethylene oxide. Background technique [0002] Ethylene Oxide / Ethylene Glycol (EG) is the third largest product in the series of ethylene products. It has a wide range of uses and is an important chemical raw material for the production of polyester, surfactants, antifreeze, etc. [0003] The method for preparing monoethylene glycol from ethylene through ethylene oxide is to use ethylene and oxygen to generate ethylene oxide through catalytic oxidation reaction in the presence of a silver catalyst, and then ethylene oxide is hydrolyzed to generate ethylene glycol. The whole production system includes an ethylene oxide reaction system, an ethylene oxide hydration reaction system, and an ethylene glycol separation and purification system. The ethylene glycol separation and purification system includes an evaporatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/20C07C29/10
Inventor 黄耀相李红凯吉京华高全乐陈小新王红熊玉云洪传辉许志远朱为明
Owner CHINA HUANQIU CONTRACTING & ENG CO LTD
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