Method for removing residual oxygen in product flow of ethylene preparation by ethane catalytic oxidative dehydrogenation

A technology of catalytic oxidation and oxidative dehydrogenation, applied in chemical instruments and methods, hydrocarbons, hydrocarbons, etc., can solve the problem of high-grade deaerator equipment material, large deaerator processing load, and low deoxygenation reaction efficiency and other problems, to achieve the effect of reducing equipment material requirements, reducing equipment investment and improving recycling rate

Pending Publication Date: 2020-12-29
WISON ENG +1
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  • Description
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AI Technical Summary

Problems solved by technology

[0008] In the above-mentioned existing patented technology, for the alkane oxidative dehydrogenation reaction product stream, oxygen removal is often performed first, and then water or water-soluble products are removed. This process has the following problems: (1) the oxygen removal reaction efficiency is low, and the oxygen removal The effect is poor; (2) The processing load of the deaerator is large, the material grade of the equipment required for the deaerator is high, the required equipment size is large and the equipment investment is high

Method used

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  • Method for removing residual oxygen in product flow of ethylene preparation by ethane catalytic oxidative dehydrogenation
  • Method for removing residual oxygen in product flow of ethylene preparation by ethane catalytic oxidative dehydrogenation
  • Method for removing residual oxygen in product flow of ethylene preparation by ethane catalytic oxidative dehydrogenation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] In this example, the diluent gas 2 is nitrogen, the oxygen-containing gas 3 is compressed air, and the production scale is 1 million tons of ethylene per year. A method for removing residual oxygen in the product stream of ethylene by catalytic oxidative dehydrogenation of ethane is given. , the process such as figure 2 As shown, it specifically includes the following steps:

[0052] The ethane raw material 1 from the ethane pretreatment unit, with a flow rate of about 150t / h, is mixed with the diluent gas 2, the oxygen-containing gas 3 and the circulating condensate 17 (ie part of the tank bottom condensate 16) to obtain a mixed feed 5, which is processed The material preheater 16 is preheated to 230°C and then sent to the oxidative dehydrogenation reactor 8 equipped with a catalyst, thereby obtaining at least ethylene, ethane, acetic acid, water, CO and CO 2 The crude product gas 9.

[0053] The obtained crude product gas 9 is connected to the waste heat recovery d...

Embodiment 1 and comparative example 1

[0064] Table 2 embodiment 1 and comparative example 1, deaerator effective reactant concentration and oxygen removal effect

[0065]

[0066]

[0067] From the results in Table 1, it can be found that the feed rate of the deaerator of Example 1 is less than that of the deaerator of Comparative Example 1; this means that the equipment size of the deaerator of Example 1 is smaller than that of Comparative Example 1 The size of the deaerator; the small size means that the equipment investment is low; that is, the investment cost of the deaerator in Example 1 is lower than that of the deaerator in Comparative Example 1. From the results in Table 2, it can be found that in Example 1, the effective reactants in the deaerator feed, such as CO, CH 4 and O 2 The concentration is greater than the effective reactant concentration in Comparative Example 1. This means that the deoxygenation reaction rate of the deaerator of Example 1 is greater than that of Comparative Example 1. ...

Embodiment 2

[0073] In this example, the diluent gas 2 is nitrogen in compressed air, the oxygen-containing gas 3 is compressed air, and the production scale is 800,000 tons of ethylene per year. Oxygen removal method, process flow such as image 3 As shown, it specifically includes the following steps:

[0074] The ethane raw material 1 from the ethane pretreatment unit, with a flow rate of about 122t / h, is mixed with the diluent gas 2, the oxygen-containing gas 3 and the circulating condensate 17 to obtain a mixed feed 5, which is preheated by the feed preheater 2 6' After reaching 210 ° C, the preheated mixed feed 7 is obtained, and sent to the oxidative dehydrogenation reactor 8 equipped with a catalyst, thereby obtaining at least ethylene, ethane, acetic acid, water, CO and CO 2 The crude product gas 9.

[0075] The obtained crude product gas 9 is connected to the waste heat recovery device 10, and the waste heat recovery device 10 recovers the high-temperature waste heat of the cru...

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Abstract

The invention relates to a method for removing residual oxygen in a product flow of ethylene preparation by ethane catalytic oxidative dehydrogenation, wherein the method comprises the following steps: (1) feeding mixed raw material gas into an oxidative dehydrogenation reactor for reaction, carrying out waste heat recovery and cooling on the obtained crude product gas, and then feeding the crudeproduct gas into a gas-liquid separation tank for gas-liquid separation; (2) cooling a gas phase at the top in the gas-liquid separation tank, feeding the cooled gas phase into an absorption tower, and obtaining deacidified gas from the top of the absorption tower under the action of a tower top absorbent; and (3) feeding the obtained deacidified gas into a deaerator, and deoxidizing to obtain a deoxidized crude product. Compared with the prior art, the treatment capacity of the deaerator can be effectively reduced, the equipment investment is reduced, and meanwhile, the improvement of the deaeration reaction depth is facilitated. Besides, part of process condensate is injected into the mixed feed gas flow, and the reaction waste heat is gasified and recycled, so that the reaction temperature rise can be effectively controlled, and more reaction waste heat can be recycled.

Description

technical field [0001] The invention belongs to the technical field of ethylene preparation, and relates to a method for removing residual oxygen in a product stream produced by catalytic oxidative dehydrogenation of ethane to produce ethylene. Background technique [0002] As an important organic chemical raw material, ethylene is one of the symbols to measure the development level of a country's chemical industry. With the increasing shortage of petroleum resources and the continuous discovery of natural gas resources, low-carbon alkanes have become potential cheap raw materials for the production of ethylene. At present, the methods for producing ethylene mainly include steam cracking, oxyhalogenation and ethane catalytic dehydrogenation. Steam cracking method is also the most widely used method at present. It is a strong endothermic process, which not only requires high temperature (generally higher than 850°C), but also needs to be carried out under negative pressure (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/04C07C5/48C07C7/148
CPCC07C5/48C07C7/14816C07C11/04Y02P20/10Y02P20/50
Inventor 闫兵海宫万福吕建宁刘佳涛杨维慎王红心
Owner WISON ENG
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