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Method for increasing production of butadiene by mixing carbon four

A technology for mixing C4 and butadiene, which is applied in chemical instruments and methods, hydrocarbons, hydrocarbons, etc., and can solve the problems of low added value of butene components

Active Publication Date: 2015-11-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The technical problem mainly solved by the present invention is the problem of low added value in the use of butene components in cracking ethylene mixed with C4 in the prior art

Method used

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  • Method for increasing production of butadiene by mixing carbon four

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Embodiment 1

[0027] The by-product of a cracking ethylene plant is 200,000 tons / year of mixed carbon four. figure 1 The process technology, the weight composition of mixed carbon four is: isobutane 2%, n-butane 4%, butene 22%, isobutene 22%, butadiene 50%, the mixed carbon four first enters the butadiene extraction unit , use dimethylformamide (DMF) as an extractant to extract the butadiene in it, and the extracted material enters the pre-separation tower, the number of theoretical plates of the pre-separation tower is 80, the operating temperature at the top of the tower is 45°C, and the pressure is 0.55MPaG, the top of the tower is isobutane and isobutene, and its removal rate is 99%. Butene enters the oxidative dehydrogenation unit and reacts with air. The oxidative dehydrogenation unit adopts a two-stage radial fixed-bed reactor process, an iron-based catalyst, the main composition includes iron, zinc, and magnesium, and the molar ratio is: Fe: Zn: Mg= 10:3:5, prepared by co-precipita...

Embodiment 2

[0030] The by-product of a cracking ethylene plant is 200,000 tons / year of mixed C4. The weight composition of mixed C4 is: 2% isobutane, 4% n-butane, 22% butene, 22% isobutene, and 50% butadiene. The mixed carbon four first enters the butadiene extraction unit, and uses dimethylformamide (DMF) as an extraction agent to extract the butadiene. After extraction, the material enters the pre-separation tower, and the theoretical plate number of the pre-separation tower is 80 , the operating temperature at the top of the tower is 45°C, the pressure is 0.55MPaG, the top of the tower is isobutane and isobutene, and the removal rate is 99%. The crude butene with a purity of 90% is obtained, and the crude butene enters the oxidative dehydrogenation unit and reacts with air. The oxidative dehydrogenation unit adopts a three-stage radial fixed-bed reactor process, an iron-based catalyst, and the main composition includes iron, zinc, and magnesium components , the molar ratio is: Fe:Zn:Mg...

Embodiment 3

[0033] The by-product of a cracking ethylene plant is 200,000 tons / year of mixed carbon four. figure 1 The process technology, the weight composition of mixed carbon four is: isobutane 2%, n-butane 4%, butene 22%, isobutene 22%, butadiene 50%, the mixed carbon four first enters the butadiene extraction unit , using acetonitrile (ACN) as an extractant to extract the butadiene in it, and the extracted material enters the pre-separation tower. The top is isobutane and isobutene, and its removal rate is 99%. The bottom material of the tower enters the de-butanization unit, and acetonitrile (ACN) is used as the extraction agent to obtain crude butene with a purity of 90%, and the crude butene enters the oxidation process. The dehydrogenation unit reacts with air, and the oxidative dehydrogenation unit adopts a two-stage radial fixed-bed reactor process. The iron-based catalyst is mainly composed of iron, zinc, magnesium and other components. The molar ratio is: Fe:Zn:Mg=10:3 : 5, ...

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Abstract

The invention relates to a method for increasing yield of butadiene by using mixed C4 from ethylene cracking, and mainly solves the problem of low utilization added value of a butene component in mixed C4 from ethylene cracking. The invention adopts an ethylene cracking by-product mixed C4 as a raw material, and comprises the following steps: a) first extracting a butadiene component in the material by using an extractant; b) separating out iso-butane and isobutene components from a separation column, to obtain a mixed stream mainly comprising butene and n-butane; c) separating the butene and n-butane in the mixed stream by an extractant to obtain a high-purity butylene stream; d) conducting contact reaction on the butylene stream, oxygen-containing gas, steam and a catalyst in an oxidative dehydrogenation reactor to obtain a stream rich in butadiene; and e) removing oxygenated chemicals in the butadiene-containing stream, conducting oil absorption and compression, and extracting a butadiene product by an extractant. The technological scheme well solves the above problem, and can be used for industrial production for increasing yield of butadiene by using ethylene cracking by-product mixed C4.

Description

technical field [0001] The invention relates to a method for cracking ethylene mixed carbon four to increase the production of butadiene. Background technique [0002] Mixed carbon four is an important petrochemical resource, which is a general term for alkanes, monoolefins and diolefins. The C4 by-product of cracking ethylene is mainly composed of butene, isobutene, n-butane, isobutane and butadiene, and the most valuable component in chemical industry is mainly butene (1-butene, cis-2-butene , trans-2-butene), isobutene and butadiene, followed by n-butane. At present, the chemical utilization of C4 fractions in my country is still in the initial stage. C4, a by-product of cracking ethylene, contains about 40% butadiene. After the butadiene is extracted, the main components are butene, n-butane and isobutane, and part of it is directly sent to the alkylation unit to produce alkylated gasoline or Composite gasoline; partly used to produce polybutene and polyisobutene as l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/167C07C5/48C07C7/10
Inventor 杨为民刘文杰
Owner CHINA PETROLEUM & CHEM CORP