Method for preparing 1-butene by C4 mixture through catalytic isomerization

Abstract

The invention relates to a method for preparing 1-butene by a C4 mixture through catalytic isomerization, which mainly solves the problem of low added value of the C4 mixture in the prior art. The method comprises the following steps that: a liquid-phase C4 olefin mixture and a catalytic isomerization product perform heat exchange and then are gasified, the obtained gas is heated to be between 300 and 350 DEG C, then enters a reactor, and performs an isomerization reaction under the action of a solid acid catalyst to obtain the 1-butene, the catalytic isomerization product and a raw material perform heat exchange and then enter a concentration tower, a mixture rich in the 1-butene is obtained at the tower top, and a high-purity 1-butene product is obtained after the mixture enters a 1-butene separation device. The technical proposal that a tower bottom liquid partially circulates into the reactor better solves the problem of the low added value of the C4 mixture, and the method can be widely applied to the industrial production used for increasing the production of the 1-butene.

Description

technical field

[0001] The invention relates to a method for preparing 1-butene by catalytic isomerization of a carbon four mixture. Background technique

[0002] 1-butene is a kind of a-olefin with relatively active chemical properties. High-purity butene-1 is used to produce linear low-density polyethylene resin (LLDPE), high-density polyethylene (HDPE), polybutene resin (PB), etc. main raw material. At present, low-density polyethylene resin (LLDPE) is far from meeting the market demand, while high-density polyethylene (HDPE) and polybutene resin (PB) resin are also facing the contradiction between supply and demand of raw materials, resulting in the emergence of 1-butene market. Serious shortage of supply.

[0003] There are two main production routes of 1-butene, one is the oligomerization process using ethylene as raw material, and the other is the mixing C 4 Extraction or separation processes where hydrocarbons are the feedstock, the latter accounting for about 64....

Examples

Embodiment 1

[0038] according to figure 1 As shown, the C4 mixture feed composition (weight %) is: 1-butene: 1.8%, butane: 21%, 2-butene: 77.2%. Adopt technological process of the present invention, catalyst is the SiO of 50% (weight) 2 , 50% (weight) of Al 2 o 3 , the reaction temperature is 330°C, the reaction pressure is 0.8MPa, and the reaction weight space velocity is 10 hours -1 , 50% by weight of tower bottom liquid circulation, 1-butene yield is 27.8% (for feed olefins), obtains crude 1-butene (weight %):

[0039] 1-Butene: 22.5%

[0040] Butane: 21.9%

[0041] 2-Butene: 55.5%

[0042] Other components: 0.1%

Embodiment 2

[0044] according to figure 1 As shown, the C4 mixture feed composition (weight %) is: 1-butene: 1.8%, butane: 21%, 2-butene: 77.2%. Adopt technological process of the present invention, catalyst is the SiO of 80% (weight) 2 , 20% (weight) of Al 2 o 3 , the reaction temperature is 350°C, the reaction pressure is 1.05MPa, and the reaction weight space velocity is 15 hours -1, 90% by weight of tower bottom liquid circulation, 1-butene yield is 42.4% (for feed olefins), obtains crude 1-butene (weight %):

[0045] 1-Butene: 34.3%

[0046] Butane: 21.6%

[0047] 2-Butene: 44%

[0048] Other components: 0.1%

technical field

[0001] The invention relates to a method for preparing 1-butene by catalytic isomerization of a carbon four mixture. Background technique

[0002] 1-butene is a kind of a-olefin with relatively active chemical properties. High-purity butene-1 is used to produce linear low-density polyethylene resin (LLDPE), high-density polyethylene (HDPE), polybutene resin (PB), etc. main raw material. At present, low-density polyethylene resin (LLDPE) is far from meeting the market demand, while high-density polyethylene (HDPE) and polybutene resin (PB) resin are also facing the contradiction between supply and demand of raw materials, resulting in the emergence of 1-butene market. Serious shortage of supply.

[0003] There are two main production routes of 1-butene, one is the oligomerization process using ethylene as raw material, and the other is the mixing C 4 Extraction or separation processes where hydrocarbons are the feedstock, the latter accounting for about 64....

Examples

Embodiment 1

[0038] according to figure 1 As shown, the C4 mixture feed composition (weight %) is: 1-butene: 1.8%, butane: 21%, 2-butene: 77.2%. Adopt technological process of the present invention, catalyst is the SiO of 50% (weight) 2 , 50% (weight) of Al 2 o 3 , the reaction temperature is 330°C, the reaction pressure is 0.8MPa, and the reaction weight space velocity is 10 hours -1 , 50% by weight of tower bottom liquid circulation, 1-butene yield is 27.8% (for feed olefins), obtains crude 1-butene (weight %):

[0039] 1-Butene: 22.5%

[0040] Butane: 21.9%

[0041] 2-Butene: 55.5%

[0042] Other components: 0.1%

Embodiment 2

[0044] according to figure 1 As shown, the C4 mixture feed composition (weight %) is: 1-butene: 1.8%, butane: 21%, 2-butene: 77.2%. Adopt technological process of the present invention, catalyst is the SiO of 80% (weight) 2 , 20% (weight) of Al 2 o 3 , the reaction temperature is 350°C, the reaction pressure is 1.05MPa, and the reaction weight space velocity is 15 hours -1, 90% by weight of tower bottom liquid circulation, 1-butene yield is 42.4% (for feed olefins), obtains crude 1-butene (weight %):

[0045] 1-Butene: 34.3%

[0046] Butane: 21.6%

[0047] 2-Butene: 44%

[0048] Other components: 0.1%

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