Method for utilizing cold energy of low-temperature ethylene during VCM preparation through ethylene balanced oxychlorination method

A technology of oxychlorination and ethylene, applied in chemical instruments and methods, preparation of halogenated hydrocarbons, chemical industry, etc., can solve problems such as ineffective use of liquid ethylene cold energy, no use of cold energy, and large steam consumption, etc., to achieve Reduce equipment maintenance costs, save electricity, and save steam

Inactive Publication Date: 2016-08-10
青岛海湾集团有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] This process consumes a large amount of steam, and at the same time, a large amount of cold energy of liquid ethylene cannot be effectively utilized, resulting in repeated waste of energy
[0009] At present, as an independent device, the low-temperature ethylene storage tank does not make full use of its cold energy, which causes a lot of energy waste and requires additional input of a large amount of steam to heat the ethylene

Method used

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  • Method for utilizing cold energy of low-temperature ethylene during VCM preparation through ethylene balanced oxychlorination method
  • Method for utilizing cold energy of low-temperature ethylene during VCM preparation through ethylene balanced oxychlorination method

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Embodiment 1

[0050] Reference attached figure 2 An ethylene vaporization process device for preparing vinyl chloride by an ethylene equilibrium oxygen-chlorine method comprises a liquid ethylene storage tank 1, a chlorine oxidation reactor / chlorination reactor 2, a hydrogen chloride tower 3, and delivery pumps (4, 5). Liquid ethylene at -103°C is stored in the ethylene storage tank 1 for standby use. The liquid ethylene storage tank 1 is provided with a pump 4 to facilitate the output of the liquid liquid. The liquid ethylene flows out of the liquid ethylene storage tank 1 in two ways. The first ethylene stream flows into the chlorination reactor / chlorine oxidation reactor 2 through the first pipeline 6, and two heat exchangers (8,9) are arranged on the pipeline 6, and the heat medium of the heat exchanger can be selected for use commonly used in this field Substances such as methanol vapor, etc., make liquid ethylene at a temperature of -103°C heat up to vaporize into ethylene at -26°C t...

experiment example 1

[0055] This embodiment is based on the equipment of Embodiment 1 of the present invention. By utilizing the cold energy of ethylene, the energy saving is as follows: Other processes and process parameters refer to the prior art. The difference is that the ethylene vaporization process is different.

[0056] According to 400,000 tons / year VCM, vinyl chloride is 50,000kg / h, and the amount of hydrogen chloride produced is 28,432kg / h. If 50% of the hydrogen chloride condensation is designed to be realized by the cold energy of low-temperature ethylene, the calculation is as follows:

[0057] The cooling energy required for the liquefaction of gaseous hydrogen chloride at the top of the hydrogen chloride tower at -35°C is:

[0058] Q 1 =mr=28432kg / h×50%×91.7kcal / kg=1303607.2kcal / h

[0059] Therefore, the cooling energy to be provided by the ethylene vaporizer is:

[0060] Q 2 =Q 1 =1303607.2kcal / h

[0061] According to the pipe network pressure and the condensation temperature...

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Abstract

Disclosed is an ethylene vaporization method and device for vinyl chloride preparation through an ethylene balanced oxychlorination method. Ethylene at the temperature of -103 DEG C is utilized to condensate a hydrogen chloride product at the top of a hydrogen chloride column, thereby reducing the load of a refrigerating unit of a hydrogen chloride condenser and saving electricity. At the same time, liquid ethylene is evaporated during the heat exchange process, and no vapor is consumed for heating. The great economic benefit is produced, and environmental noise of operation is reduced. The comprehensive utilization rate of energy is increased, and the energy-saving and cost-reducing, and low-carbon and eco-friendly purpose is achieved.

Description

technical field [0001] The invention relates to a device for preparing vinyl chloride by an ethylene balanced oxychlorination method, in particular to a device and a process for preparing vinyl chloride by a low energy consumption balanced oxychlorination method. Background technique [0002] The cryogenic ethylene storage tank plant includes refrigerated cryogenic storage tanks, ship unloading / loading facilities, unloading / loading facilities, ethylene reliquefaction system, ethylene vaporization and superheating system, output system and other equipment for safe and stable operation of the plant and device components. When using low-temperature ethylene, it is necessary to vaporize liquid ethylene and send it to downstream users. Generally, it needs to be heated and vaporized from -103°C to at least a minimum of -26°C. This will consume a lot of steam, but also waste a lot of cold energy. The temperature of the liquid ethylene coming out of the low-temperature ethylene tan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C17/156C07C21/06
CPCY02P20/10
Inventor 郎需霞李明高自建张清亮王凯刘珍玉纪业梁锡伟
Owner 青岛海湾集团有限公司
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