Method for producing butadiene through mixing carbon C

A technology for mixing C4 and butadiene, which is applied in chemical instruments and methods, hydrocarbons, hydrocarbons, etc., can solve the problem of low yield of butadiene per pass, high equipment investment and energy consumption, and conversion of butene in one pass. In order to achieve good technical results, reduce energy consumption and waste water discharge, and improve the effect of fluidization

Inactive Publication Date: 2013-09-18
王伟跃
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The problem to be solved by the present invention is the technical problems such as low conversion rate of butene per pass, low yield per pass of butadiene and high device investment and energy consumption in the oxidative dehydrogenation of butene to butadiene in the prior art, and provides a new Butadiene preparation method

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  • Method for producing butadiene through mixing carbon C
  • Method for producing butadiene through mixing carbon C
  • Method for producing butadiene through mixing carbon C

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Experimental program
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Embodiment 1

[0043] according to figure 1 As shown, zinc ferrite, calcium ferrite and manganese ferrite co-precipitation catalysts are used, and the catalysts are spherical particles with a particle size of 10-120 microns. The diameter of the fixed fluidized bed reactor is 2.6 meters, and the height is 18 meters; the molar ratio of raw material butene, oxygen, and water vapor is 1:0.67:9.0, and the temperatures of mixed carbon dioxide, air and low-pressure steam after preheating are respectively 260 ℃, the reactor temperature is controlled at 385°C; the quench tower is designed as a two-stage structure, the lower part is an empty tower structure, and the upper part is a sieve plate tower structure; n-hexane is used as the absorbent, and the absorption tower and the desorption tower are designed as a sieve plate tower structure. Experiments have proved that, by adopting the method of the present invention, the single pass conversion rate of butene is 91.3%, and the selectivity to butadiene ...

Embodiment 2

[0045] according to figure 1 As shown, zinc ferrite, calcium ferrite and manganese ferrite co-precipitation catalysts are used, and the catalysts are spherical particles with a particle size of 30-100 microns. The diameter of the fixed fluidized bed reactor is 2.6 meters, and the height is 18 meters; the molar ratio of raw materials butene, oxygen, and water vapor is 1:0.71:9.8, and the temperatures of mixed carbon dioxide, air and low-pressure steam after preheating are respectively 220 ℃, the reactor temperature is controlled at 355°C; the quench tower is designed as a two-stage structure, the lower section is an empty tower structure, and the upper section is a packed tower structure; n-hexane is used as the absorbent, and the absorption tower and the desorption tower are designed as a packed tower structure. The experiment proves that, adopting the method of the present invention, the single pass conversion rate of butene is 90.7%, and the selectivity to butadiene is 96.3%...

Embodiment 3

[0047] according to figure 1 As shown, zinc ferrite, calcium ferrite and manganese ferrite co-precipitation catalysts are used, and the catalysts are spherical particles with a particle size of 60-120 microns. The diameter of the fixed fluidized bed reactor is 2.6 meters, and the height is 18 meters; the molar ratio of raw material butene, oxygen, and water vapor is 1:0.63:8.5, and the temperatures of mixed carbon dioxide, air and low-pressure steam after preheating are respectively 340 ℃, the reactor temperature is controlled at 415°C; the quench tower is designed as a two-stage structure, the lower section is an empty tower structure, and the upper section is an empty tower structure; octane is used as the absorbent, and the absorption tower and the desorption tower are designed as a floating valve tower structure. Experiments have proved that, by adopting the method of the invention, the single pass conversion rate of butene is 90.1%, and the selectivity to butadiene is 97....

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Abstract

The invention discloses a method for producing butadiene through mixing carbon C, mainly solving the problems of poor butene conversion per pass, low butadiene once through yield and large device energy consumption in the prior art. The following main technical schemes are adopted to realize the purposes: adopting a ferrite catalyst and a fluidized bed reactor reaction technology to carry out oxidative dehydrogenation on butene in a mixed carbon C so as to generate butadiene; exchanging heat with a desalted water by utilizing a gas generated after the reaction and generating a byproduct-steam, further cooling the gas to be about 110 DEG C, and filling the gas into a quench tower to remove impurities such as water, oxides and solid powder; condensing the quenched gas to be about 1.2MPa, absorbing and resolving to obtain crude butadiene; and treating the crude butadiene through utilizing a conventional butadiene extraction and separation technology so as to obtain a polymer grade butadiene product. By utilizing the method, the conversion per pass of the butene in the mixed carbon C is more than 90%, the butadiene selectivity is more than 95%, the device energy consumption is reduced by about 40%, and the device investment is saved about 20%, and the method can be applied to the field of butadiene industrial production.

Description

technical field [0001] The invention relates to a method for preparing butadiene by mixing carbon four. Background technique [0002] Butadiene plays an important role in the national economy and is the main raw material for synthetic rubber such as butadiene rubber, nitrile rubber, styrene-butadiene rubber, ABS engineering plastics, nylon, adiponitrile, 1,4-butanediol, etc. In recent years, the market has been in short supply. With the rise of crude oil prices and more and more oilfield gas and shale gas being used as raw materials for steam cracking, the shortage of butadiene will be difficult to change in the next few years. At present, butadiene mainly comes from the by-product mixed carbon four of the steam cracking unit. [0003] Mixed carbon four is one of the main by-products of steam cracking units and refinery catalytic cracking units. According to the difference of raw material, reaction depth and catalyst, the composition difference of by-product mixed carbon f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/16C07C5/48
Inventor 王伟跃
Owner 王伟跃
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