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System for preparing isobutane and separation method

A separation method and technology for isobutane are applied in the system and separation field for preparing isobutane, and can solve the problems such as the inability to uniformly handle isobutane and the like

Active Publication Date: 2015-01-14
SINOPEC ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In order to solve the problem in the prior art that the C4 mixture in the refinery and the C4 after ether in the ethylene plant cannot be uniformly processed to produce high-purity isobutane, the present invention provides a system and separation method for preparing isobutane

Method used

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  • System for preparing isobutane and separation method
  • System for preparing isobutane and separation method
  • System for preparing isobutane and separation method

Examples

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Embodiment

[0091] Such as figure 1 Shown, a system for preparing isobutane.

[0092] Including: extractive distillation tower 2, alkane washing tower 8, stripping tower 9, olefin washing tower 12, solvent recovery tower 14, hydrogenation reactor 17, hydrogenation inlet and outlet heat exchanger 18, hydrogenation feed heater 19 , hydrogenation thermal separation tank 20, hydrogenation aftercooler 21, hydrogenation cold separation tank 23, compressor suction tank 24, compressor 25, light removal tower 29, isobutane finished product tower 32;

[0093] The top of the extractive distillation tower 2 is connected to the alkane water washing tower 8, and the bottom of the extractive distillation tower 2 is connected to the stripper 9; ;

[0094] The top of the alkane water washing tower 8 is connected to the hydrogenation inlet and outlet heat exchanger 18, the hydrogenation feed heater 19, and then connected to the upper part of the hydrogenation reactor 17;

[0095] The bottom of the hydro...

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Abstract

The invention discloses a system for preparing isobutane and a separation method. The system comprises an extraction rectifying tower, an alkane water-washing tower, a stripping tower, an alkene water-washing tower, a solvent recovery tower, a hydrogenation reactor, a hydrogenation charging / discharging heat exchanger, a hydrogenation charging heater, a hydrogenation separation device, a light-composition removal tower and an isobutane finishing tower. The hydrogenation separation device comprises a hydrogenation cooler, a hydrogenation heat separation tank and a hydrogenation cold separation tank, or comprises a hydrogenation cooler and a hydrogenation separation tank. The method comprises performing extraction rectification on C4 hydrocarbons subjected to etherification to prepare a butylenes product; recovering a high-pressure tail gas after a hydrogenation reaction, so as to improve the recovery rate of the isobutane product; and performing extraction rectification and hydrogenation on saturated and unsaturated C4 raw materials, so as to prepare the isobutane product. The system and the method are capable of processing all refinery C4 and ethylene-apparatus etherified C4 and recovering solvent waste heat, and the economic benefit of the apparatus is improved.

Description

technical field [0001] The present invention relates to the field of C4, and furthermore, relates to a system and a separation method for preparing isobutane. Background technique [0002] Many refinery and chemical integration enterprises in my country are rich in light hydrocarbon resources, and there is a surplus of C4 fractions. With the rapid improvement of my country's crude oil processing capacity and the continuous increase of ethylene production, C4 resources, which are petrochemical by-products, are also expanding. How to fully and rationally utilize the C4 fractions produced by refinery gas and ethylene plant, and explore the potential value of C4 products has become one of the topics that people focus on. The 1,3-butadiene contained in the C4 fraction can be separated by extractive distillation for the production of synthetic rubber. The isobutene in the C4 fraction reacts with methanol through an etherification unit to form MTBE, which can be obtained by furthe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C9/12C07C7/08C07C7/163
CPCY02P20/10
Inventor 张文斌王鑫泉马立国高耸陈皓
Owner SINOPEC ENG