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Method for absorption and separation of light hydrocarbons in isobutene unit

A technology for isobutene and light hydrocarbons, which is applied in the field of light hydrocarbons in the absorption and separation of isobutene devices, can solve the problem of high energy consumption, achieve the effects of reducing consumption, reducing solvent circulation, and good technical effects

Active Publication Date: 2018-10-19
SINOPEC SHANGHAI ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is the problem of high energy consumption in the prior art, and a new method for absorbing and separating light hydrocarbons in an isobutene unit is provided

Method used

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  • Method for absorption and separation of light hydrocarbons in isobutene unit

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Embodiment 1

[0030] A method for absorbing and separating light hydrocarbons in an isobutene unit, such as figure 1 As shown, taking the absorption tower (5) for 4 times of cooling and the desorption tower (7) for 4 times of heating as an example, the isobutane raw material and water vapor (101) enter the dehydrogenation reactor (1) to generate The isobutane dehydrogenation reaction generates isobutene product gas, the product gas and water vapor (102) are cooled and condensed through the condenser (2) and the gas-liquid separator (3), and the water vapor is condensed into condensed water, which is condensed in the gas-liquid separator (3) The gas-liquid separation is carried out inside, and the condensed water (103) flowing out from the bottom of the gas-liquid separator (3) is sent outside. The product gas (104) flowing out from the top of the gas-liquid separator (3) is pressurized through the compressor (4), and the gas phase after the pressurization is the pressurized product gas (105...

Embodiment 2

[0033] According to the conditions and steps described in Example 1, the production scale was changed to a 200,000-ton / year isobutane dehydrogenation to isobutene plant, and the composition of the product gas is shown in Table 1. Just operating condition changes, adopt technical scheme process operating parameter of the present invention: the process condition of dehydrogenation reactor (1): adopt Pt / Cr / Al 2 o 3 Catalyst, operating gauge pressure of 0.35MPa, operating temperature of 600°C, isobutane weight space velocity of 4.5 hours -1 , The molar ratio of isobutane / hydrogen is 3.2:1, the molar ratio of isobutane / steam is 0.6:1, the single-pass conversion rate of isobutane is 40%, and the yield of isobutene is 42%. The operation gauge pressure of absorption tower (5) is 0.5MPa, and tower top temperature is 45 ℃, and tower still temperature is 50 ℃, and absorption tower (5) liquid phase material cooling times is 6 times; The operation gauge pressure of desorption tower (7) is...

Embodiment 3

[0035] According to the conditions and steps described in Example 1, still taking the 100,000 tons / year isobutane dehydrogenation to isobutene plant as an example, the composition of the product gas is shown in Table 1. Just operating condition changes, adopt technical scheme process operating parameter of the present invention: the process condition of dehydrogenation reactor (1): adopt Pt / Cr / Al 2 o 3 Catalyst, operating gauge pressure of 0.15MPa, operating temperature of 520°C, isobutane weight space velocity of 2.5 hours -1 , The molar ratio of isobutane / hydrogen is 2.0:1, the molar ratio of isobutane / steam is 0.2:1, the single-pass conversion rate of isobutane is 40%, and the yield of isobutene is 42%. The operation gauge pressure of absorption tower (5) is 0.4MPa, and tower top temperature is 40 ℃, and tower still temperature is 45 ℃, and absorption tower (5) liquid phase material cooling times is 2 times; The operation gauge pressure of desorption tower (7) is 0.4MPa, ...

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Abstract

The invention relates to a method for absorbing and separating light hydrocarbon from an isobutene device, which is mainly used for solving the problem of high energy consumption in the prior art. In order to solve the problem, the technical scheme adopted by the invention lies in that the method for absorbing and separating the light hydrocarbon from the isobutene device is adopted, technical means of performing absorption and repeated cooling, performing desorption and repeated heating, performing incomplete clear segmentation, optimizing heat exchange of materials, preventing using low-temperature cooling capacity and the like are adopted, so that the circulation volume of a solvent is reduced, the consumption of public works is reduced, the steam consumption is reduced to 0.280-0.296 ton per ton of products, the power consumption is reduced to 60-68 Killiwatt per ton of products, and the method can be used for absorbing and separating the light hydrocarbon from the isobutene device.

Description

technical field [0001] The invention relates to a method for absorbing and separating light hydrocarbons in an isobutene unit. Background technique [0002] The chemical formula of isobutylene is (CH 3 ) 2 C=CH 2 , also known as 2-methylpropene, is an important chemical raw material. It is mainly used as a raw material for the synthesis of methyl tert-butyl ether MTBE, and can also be used to produce elastomers such as butyl rubber, isoprene rubber, and polyisoprene rubber, and various fine chemicals. With the increasing demand for downstream products such as MTBE, increasing the output of isobutene to meet the demand has become an urgent and important issue in the petrochemical industry. [0003] In the petrochemical industry, isobutene is separated from the mixed carbon four components of refinery gas and steam pyrolysis, and the contents of the two are about 5% to 12% and 20% to 30% respectively. In addition, the use of isobutane dehydrogenation process is also an im...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/11C07C11/09
CPCC07C7/11C07C11/09
Inventor 唐绮颖章彦卿堵祖荫葛春方李真泽张斌何琨
Owner SINOPEC SHANGHAI ENG