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Coal-based ethylene glycol refining process and system

A technology for producing ethylene glycol and ethylene glycol from coal is applied in the preparation of hydroxyl compounds, the preparation of organic compounds, and the separation/purification of hydroxyl compounds, which can solve the problems of low yield, substandard product purity, and high energy consumption of the device , to achieve the effect of high product quality, improved production yield and reasonable process

Inactive Publication Date: 2017-05-31
安阳永金化工有限公司
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  • Claims
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of coal-to-ethylene glycol technology in the above-mentioned prior art, such as immature technology, high energy consumption and low yield, and product purity and other indicators that are not up to standard, and provide a long-term, full-load, Coal-to-ethylene glycol refining process and system with 100% superior product rate

Method used

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  • Coal-based ethylene glycol refining process and system
  • Coal-based ethylene glycol refining process and system

Examples

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Embodiment 1

[0031] A coal-to-ethylene glycol refining process, such as figure 1 As shown, the process includes the following steps:

[0032] Step 1: The crude ethylene glycol passes through the precision filter 1 to remove mechanical impurities, and the crude ethylene glycol contains 65% methanol and 30% ethylene glycol;

[0033] Step 2: The raw material that removes mechanical impurities enters from the middle of the pre-stripping tower 2, and the methanol in the raw material liquid is removed from the top of the pre-stripping tower and sent to the intermediate tank area, which is transported to the synthesis system as a raw material, and the methanol is recycled to reduce material consumption. The crude ethylene glycol after removing most of the methanol is discharged from the tower kettle, the operating pressure is slightly positive pressure, the temperature at the top of the tower is 64.5-65.5°C, the temperature at the bottom of the tower is 99-103°C, and the reflux ratio is between 1...

Embodiment 2

[0044] A coal-to-ethylene glycol refining system, such as figure 2 As shown, it includes precision filter 1, pre-stripping tower 2, main stripping tower 3, light removal tower 4, degreasing tower 5, product rectification tower 6, recovery tower 7, weight removal tower 8, liquid phase hydrogenation reactor 9 and dealdehyde device 10; the outlet of the precision filter is connected to the middle inlet of the pre-stripping tower through a pipeline, and the outlet of the pre-stripping tower is connected to the middle entrance of the main stripping tower through a pipeline, and the outlet of the main stripping tower is connected to the stripping tower through a pipeline. The inlet of the middle part of the light tower, the outlet of the tower kettle of the light removal tower are connected to the upper inlet of the skimming tower through pipelines, the outlet of the tower kettle of the skimming tower is connected to the inlet of the middle and lower part of the product distillation...

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Abstract

The invention belongs to the technical field of chemical engineering, and particularly relates to a coal-based ethylene glycol refining process and system. The refining system comprises a precision filter, a pre-removing tower, a main removing tower, a light component removing tower, a derosination tower, a product rectifying tower, a recovery tower, a heavy component removing tower, a liquid phase hydrogenation reactor and an aldehyde removing device. According to the process, coarse coal-based ethylene glycol is refined to obtain an ethylene glycol product by the process of fine filtration, dealcoholization, derosination, product rectification, product recovery, hydrogenation and ethylene glycol refining. All indexes of the product reach or exceed all indexes specified in GB / T 4649-2008. The invention aims to overcome the defects of immaturity of the coal-based ethylene glycol technique, high device energy consumption, low yield, unqualified product purity and the like in the prior art, and provides the coal-based ethylene glycol refining process and system which can realize long period, full load, and hundred percent of superior products.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a coal-to-ethylene glycol refining process and system. Background technique [0002] Ethylene glycol, also known as "glycol", is a strategic bulk chemical basic raw material with a very wide range of industrial uses, mainly used in the production of polyester, antifreeze, adhesives, paint solvents, cold-resistant lubricating oil and polyester polyols Wait. In recent years, due to the rapid development of polyester production in my country, the demand for ethylene glycol increased from 6.36 million tons to 7.1 million tons from 2008 to 2010. Although my country's ethylene glycol production capacity and output have grown rapidly, it still cannot meet the growing market demand for domestic polyester, and still needs a large amount of imports every year. In 2006, the import dependence was as high as 72.26%. [0003] At present, there are two main technical routes for th...

Claims

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Application Information

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IPC IPC(8): C07C29/74C07C29/80C07C29/90C07C31/20
CPCC07C29/74C07C29/80C07C29/90C07C31/202
Inventor 韩联国张超奇邢艳红郑卫程亚娟
Owner 安阳永金化工有限公司
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