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Method for preparing butadiene with butylene oxo-dehydrogenation of axially-located bed

A technology of axial fixation and oxidative dehydrogenation, applied in chemical instruments and methods, organic chemistry, hydrocarbons, etc. Large volume and other problems, to achieve significant economic and social benefits, steam saving, low steam unit consumption

Active Publication Date: 2012-06-13
ZIBO QIXIANG TENGDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As far as the bed type is concerned, fluidized beds were all used in my country in the early days. The disadvantages are that the catalyst is easy to be crushed and lost under the fluidized working state, and the catalyst consumption is large. The catalyst powder is easy to cause blockage of the rear system, and the unit consumption of steam is 7 More than tons
The early fixed bed was a radial bed. Although the problem of catalyst loss was solved, the cross-sectional area of ​​the bed layer changed with the size of the radius, which resulted in a high linear velocity in the reaction section, and poor conversion of butene and selectivity of butadiene. Ideal, the unit steam consumption is more than 8 tons
Among the existing technologies, the main disadvantage is that the yield of butadiene is low, only about 60%, which makes the production cost too high and cannot be compared with the method of cracking ethylene to produce butadiene, such as: American Petro-Tex iron-based catalyst Fixed bed, butadiene yield 60%, steam unit consumption 8.8 tons

Method used

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  • Method for preparing butadiene with butylene oxo-dehydrogenation of axially-located bed
  • Method for preparing butadiene with butylene oxo-dehydrogenation of axially-located bed
  • Method for preparing butadiene with butylene oxo-dehydrogenation of axially-located bed

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The diameter of the reactor is 3m, the height of the stainless steel reactor is 4.5m, and the height of the catalyst bed is 0.5m. Butene gas phase space velocity 400h -1 , the reactor inlet temperature is 315±2°C, the molar ratio of butene:oxygen:water in the first-stage reaction is 1:0.55:16, and the molar ratio of butene:oxygen in the second-stage reaction is 1:0.7, and the reaction lasts for 100 hours. The average data of the results are shown in Table 1.

[0022] Table 1. 100-hour test result table

[0023]

Embodiment 2

[0025] The diameter of the reactor is 3 meters, the height is 4.5 meters, and the height of the catalyst bed is 0.6 meters. Butene gas phase space velocity 400h -1 , the inlet temperature of the reactor is 315±2°C, the molar ratio of butene:oxygen:water in the first stage reaction is 1:0.65:16, and the molar ratio of butene:oxygen in the second stage reaction is 1:0.65, and the reaction lasts for 100 hours. The average data of the results are shown in Table 2.

[0026] Table 2, 100-hour test result table

[0027]

Embodiment 3

[0029] The diameter of the second-stage bed reactor is 4 meters, the height is 6 meters, and the height of the catalyst bed is 0.4m. The inter-stage heat exchanger uses steam to exchange heat, and the gas phase space velocity of butene in the first stage is 300h -1 , the second-stage butene gas phase space velocity is 500h -1 The molar ratio of butene:oxygen:water in the first stage reaction is 1:0.6:16, and the molar ratio of butene:oxygen in the second stage reaction is 1:0.7. The carbon formation of the catalyst is shown in Table 3.

[0030] Table 3. Data table of heat exchange and carbon formation between two bed sections

[0031]

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Abstract

The invention relates to a method of preparing butadience with a butylene oxydehydrogenation device in a fixed bed, which belongs to the chemical technical field. The butylene, air and water vapor give an oxydehydrogenation reaction in an axial fixed bed reactor and generate the butadience. The axial fixed bed reactor has two segments. Process equipment consists of a first segment of axial fixed bed reactor, an inter -segment heat exchanger, a second segment of axial fixed bed reactor, a waste heat boiler and a back heat exchanger in turn. The reactor is filled with iron-based catalyst. The ingredient of the water vapor of the first segment of reactor acts with the first segment via the inter-segment heat exchanger to generate gas in addition to exchanging heat and raising temperature andthen is mixed with the ingredient butylene and the air of the first segment to achieve the inlet temperature of the first segment of reactor. The ingredient of the first segment enters to the first segment of reactor to react. After heat exchange and temperature reduction through the inter-segment heat exchanger, the gas generated in the first segment is mixed with the feed butylene of the secondsegment and the air to achieve the inlet temperature of the second segment of reactor and reacts in the second segment of reactor. The invention has the advantages of high yield coefficient, high selectivity and steam of low unit consumption. Heat energy can be used reasonably.

Description

technical field [0001] The invention relates to a method for preparing butadiene by oxidative dehydrogenation of butene in an axial fixed bed, which belongs to the technical field of chemical industry. Background technique [0002] Butadiene is an important petrochemical product and the main raw material for the production of synthetic rubber. It is also widely used in the synthesis of engineering plastics and organic chemical products. Oxidative dehydrogenation of butene is an important method for producing butadiene. In the oxidative dehydrogenation reaction of butene, two hydrogens and oxygen in the butene molecule combine to form water, so the reaction is irreversible and the process conditions are relatively mild , with higher single-pass conversion and selectivity. The target product of oxidative dehydrogenation of butene is butadiene, and the side reaction is the deep oxidation reaction of butene and butadiene, which mainly produces carbon monoxide, carbon dioxide an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/16C07C5/48
Inventor 于元坤朱淑军胡建伟焦卫
Owner ZIBO QIXIANG TENGDA CHEM