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1, 2-dichloroethane purification method in vinyl chloride production process

A production process, dichloroethane technology, applied in chemical instruments and methods, disproportionation separation/purification of halogenated hydrocarbons, organic chemistry, etc., can solve the problems of multi-tower refining and multiple condensers, so as to improve the separation effect and save Equipment investment and energy consumption, the effect of simple process

Active Publication Date: 2020-10-30
万华化学(福建)有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method simplifies the traditional process flow, and the double-effect coupling operation of the deduplication towers also reduces equipment investment and energy consumption. However, this method still has multiple towers for refining and requires multiple condensers, reboilers and pumps. Defects such as equipment

Method used

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  • 1, 2-dichloroethane purification method in vinyl chloride production process
  • 1, 2-dichloroethane purification method in vinyl chloride production process
  • 1, 2-dichloroethane purification method in vinyl chloride production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The crude EDC material enters the dehydration and lightening tower to remove the mixture of water and light components, and the mixture of EDC and heavy components at the bottom of the tower enters the extractive distillation tower, the extractant enters from the top of the extractive distillation tower, and the refined EDC comes from the extractive distillation tower Extraction from the top of the tower, the mixture of extractant and heavy components at the bottom of the tower enters the flash tank for separation, heavy components are extracted from the top of the flash tank, and the extractant is recovered from the bottom of the flash tank and recycled to the extractive distillation column for reuse.

[0034] In this example, the dehydration and lightening tower is a plate tower with 70 plates, and the feeding position of the crude EDC material is the 40th plate; the temperature at the top of the tower is 70°C, the temperature at the bottom of the tower is 110°C, and th...

Embodiment 2

[0042] The technical process in this embodiment is identical with embodiment 1, and difference is:

[0043] The dehydration and lightening tower is a packed tower with 75 trays, the feeding position of the crude EDC material is the 55th tray, the temperature at the top of the tower is 80°C, the temperature at the bottom of the tower is 120°C, and the operating pressure is 0.20MPag.

[0044] The extractive distillation column is a tray column with 30 trays, and the feeding position of the mixture of EDC and heavy components is the 25th tray. In the mixed extractant, choline chloride + oxalic acid (1:1.5) and choline chloride + The mass ratio of ethylene glycol (1:4) is 1:2.5, the mass ratio of extractant to mixture is 1:4, the temperature at the top of the tower is 90°C, and the temperature at the bottom of the tower is 150°C.

[0045] The pressure of the flash tank is 0.05kPa and the temperature is 170°C.

[0046] The composition of the target product refined EDC stream 14 an...

Embodiment 3

[0051] The technical process in this embodiment is identical with embodiment 1, and difference is:

[0052] The dehydration and lightening tower is a tray tower with 50 trays, the feeding position of the crude EDC material is the 30th tray, the temperature at the top of the tower is 55°C, the temperature at the bottom of the tower is 105°C, and the operating pressure is 0.14MPag.

[0053] The extractive distillation column is a plate column with 15 plates, and the feeding position of the mixture of EDC and heavy components is the 10th plate. In the mixed extractant, choline chloride + oxalic acid (1:1.5) and choline chloride + The mass ratio of ethylene glycol (1:4) is 1:3, the mass ratio of extractant to mixture is 1:1, the temperature at the top of the tower is 95°C, and the temperature at the bottom of the tower is 170°C.

[0054] The pressure of the flash tank is 0.06kPa and the temperature is 180°C.

[0055] The composition of the target product refined EDC stream 14 and...

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Abstract

The invention provides a 1, 2-dichloroethane purification method in a vinyl chloride production process. The method comprises the following steps: 1) a crude EDC material enters a dehydration and light component removal tower to remove a water and light component mixture, and a mixture of EDC and heavy components is obtained at the bottom of the tower; 2) the mixture of EDC and heavy components and an extraction agent enter an extractive distillation tower for extractive distillation, refined EDC is extracted from the top of the extractive distillation tower, and a mixture of the extraction agent and the heavy components is obtained from the bottom of the tower; and 3) the mixture of the extraction agent and the heavy component enters a flash tank for separation, the heavy component is extracted from the top of the flash tank, and the extraction agent is extracted from the bottom of the flash tank. The extracting agent is a mixed extracting agent of choline chloride + oxalic acid (1: 1.5) and choline chloride + ethylene glycol (1: 4), the mass purity of the target product refined EDC is 99.60% or above, and the water content is smaller than 15 ppm. According to the invention, the traditional five-tower and three-tower process is simplified into a separation process of two towers and a flash tank, so that the equipment investment and the energy consumption are reduced.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, in particular to a method for purifying 1,2-dichloroethane in the production process of vinyl chloride. Background technique [0002] Vinyl chloride (VCM) is an important chemical raw material, mainly used as a monomer to produce polyvinyl chloride (PVC). The production process of vinyl chloride monomer mainly includes calcium carbide method and ethylene oxychlorination method. The calcium carbide method produces high pollution and serious energy consumption, so it is phased out. The production of ethylene oxychlorination method has a wide range of sources of raw materials, and the process is reasonable and scientific. The output of VCM accounts for more than 95% of the world's total VCM production capacity. [0003] The production of VCM by ethylene oxychlorination is mainly divided into four parts: oxychlorination reaction unit, 1,2-dichloroethane (EDC) refining unit, EDC cracking un...

Claims

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Application Information

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IPC IPC(8): C07C17/38C07C17/386C07C19/045
CPCC07C17/38C07C17/386C07C19/045
Inventor 李源周波衡华刘一魏立彬张宏科
Owner 万华化学(福建)有限公司
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