Method for preparing n-butane from mixed butane

A technology of mixing C4 and n-butane, which is applied in the field of mixing C4 and n-butane, which can solve the problems affecting the comprehensive economic benefits of the enterprise, increasing the storage and transportation costs of the enterprise, and achieving controllable production process conditions and shortening hydrogenation Effect of reaction time and less by-products

Inactive Publication Date: 2018-09-14
陈久仓
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the production of n-butane at home and abroad mainly adopts physical separation method to produce n-butane from mixed carbon four components. The disadvantage is that a large amount of by-products such as isobutane and butene will inevitably be produced, which will greatly increase the profit of the enterprise. Storage and transportation costs seriously affect the comprehensive economic benefits of enterprises

Method used

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  • Method for preparing n-butane from mixed butane

Examples

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Effect test

Embodiment 1

[0030] A method for preparing n-butane by mixing carbon four, comprising the following steps:

[0031] (1) Put the by-product C4 produced in the production process of petroleum refining, steam cracking to ethylene, methanol to olefins, etc. into a fixed bed reactor, add a hydrogenation catalyst to the reactor, and circulate hydrogen to carry out hydrogenation reaction;

[0032] (2) Mix the product after the reaction of step (1) and the desulfurizer evenly, send it into the distillation tower, control the temperature at the bottom of the tower to be 85°C, and the temperature at the top of the tower to be 150°C, and the sulfur-containing mixture flows out from the bottom of the tower, and the desulfurized The product flows out from the bottom of the tower;

[0033] (3) Send the desulfurized product into the rectification tower, control the temperature at the bottom of the rectification tower to 110°C, the middle to 160°C, and the top to 170°C, collect propane at the top of the ...

Embodiment 2

[0050] A method for preparing n-butane by mixing carbon four, comprising the following steps:

[0051](1) Put the by-product C4 produced in the production process of petroleum refining, steam cracking to ethylene, methanol to olefins, etc. into a fixed bed reactor, add a hydrogenation catalyst to the reactor, and circulate hydrogen to carry out hydrogenation reaction;

[0052] (2) Mix the product after the reaction of step (1) and the desulfurizer evenly, send it into the distillation tower, control the temperature at the bottom of the tower to be 100°C, and the temperature at the top of the tower to be 130°C, the sulfur-containing mixture flows out from the bottom of the tower, and the desulfurized The product flows out from the bottom of the tower;

[0053] (3) Send the desulfurized product into the rectification tower, control the temperature at the bottom of the rectification tower to 100°C, the middle to 150°C, and the top to 180°C, collect propane at the top of the rect...

Embodiment 3

[0070] A method for preparing n-butane by mixing carbon four, comprising the following steps:

[0071] (1) Put the by-product C4 produced in the production process of petroleum refining, steam cracking to ethylene, methanol to olefins, etc. into a fixed bed reactor, add a hydrogenation catalyst to the reactor, and circulate hydrogen to carry out hydrogenation reaction;

[0072] (2) Mix the product after the reaction of step (1) and the desulfurizer evenly, and send it into the distillation tower. The product flows out from the bottom of the tower;

[0073] (3) Send the desulfurized product into the rectification tower, control the temperature at the bottom of the rectification tower to 130°C, the middle to 140°C, and the top to 160°C, collect propane at the top of the rectification tower, collect n-butane at the bottom, and collect n-butane at the middle Isobutane;

[0074] (4) the isobutane collected in step (3) is carried out normalization reaction under catalyst action t...

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Abstract

The invention discloses a method for preparing n-butane from mixed butane, and relates to the technical field of n-butane synthesis. The method includes placing the butane in a fixed-bed reactor, adding hydrogenation catalysts into the fixed-bed reactor, circularly filling the fixed-bed reactor with hydrogen and carrying out hydrogenation reaction; uniformly mixing reaction products and desulfurizing agents with one another to obtain mixtures and feeding the mixtures into a distillation tower; feeding desulfurized products into a rectification tower, collecting propane from the top of the rectification tower, collecting the n-butane from the bottom of the rectification tower and collecting isobutane in the middle of the rectification tower; carrying out normalization reaction on the collected isobutane under the effects of catalysts to generate the n-butane. The butane which is about to be placed in the fixed-bed reactor is a byproduct generated in production procedures for refining petroleum, preparing ethylene by means of steam cracking, preparing olefin from methanol and the like. The method has the advantages that the method includes chemical processes, accordingly, operation such as repeated fractional distillation and rectification required by conventional physical methods can be omitted, production processes can be simplified, conditions can be controlled in production procedures, the n-butane prepared by the aid of the method is high in purity, and byproducts rarely can be generated.

Description

Technical field: [0001] The invention relates to the technical field of n-butane synthesis, in particular to a method for preparing n-butane by mixing carbon four. Background technique: [0002] n-butane is an important organic chemical raw material, in addition to being directly used as a fuel, it is also used as a subcritical biotechnology extraction solvent, refrigerant and organic synthesis raw material. Butane is dehydrogenated in the presence of a catalyst to form butene or butadiene, isoformed in the presence of sulfuric acid or anhydrous hydrofluoric acid to form isobutane, isobutane is catalytically dehydrogenated to form isobutene, and isobutane can be used as an alkylating agent React with olefins to form branched chain hydrocarbons with good antiknock properties. Catalytic oxidation of butane can produce maleic anhydride, acetic acid, acetaldehyde, etc.; halogenation can produce halogenated butane; nitration can produce nitrobutane; catalysis at high temperature...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C9/10C07C9/12C07C5/03C07C5/27C07C7/04B01J27/04B01J31/28
CPCB01J27/04B01J31/28C07C5/03C07C5/2791C07C7/04C07C2527/04C07C2531/28C07C9/10C07C9/12Y02P30/20Y02P30/40
Inventor 陈久仓
Owner 陈久仓
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