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C4 fraction hydrogenation method

A technology of C4 fraction and hydrogenation reaction, applied in hydrogenation to hydrocarbons, organic chemistry and other directions, can solve problems such as catalyst activity decline, and achieve the effect of ensuring efficiency and solving the easy decline of activity

Active Publication Date: 2014-12-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method mixes unsaturated C4 and hydrogen directly into the reactor, which is easy to form larger molecular hydrocarbons, which will cover the active center of the catalyst and reduce the activity of the catalyst

Method used

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Examples

Experimental program
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Embodiment 1

[0024] The C4 fraction was absorbed with toluene, wherein the liquid hourly space velocity of the toluene and the C4 fraction was shown in Table 1 to obtain a feed mixture. The feed mixture is mixed with hydrogen and then passed down to the first stage reactor for hydrogenation reaction. Supplementary hydrogen is passed through the inlet of the second-stage reactor, and the reaction effluent from the first-stage reactor is further mixed with the supplementary hydrogen and then passed into the second-stage reactor for hydrogenation reaction. The reaction effluent from the second stage reactor is separated in the high-pressure separator after being cooled, wherein the gas is discharged from the top of the high-pressure separator, and the liquid is discharged from the bottom of the high-pressure separator. The liquid enters the flash tower, the toluene is discharged from the bottom of the flash tower, and the C4 fraction hydrogenation product is discharged from the top of the fla...

Embodiment 2

[0032] In this embodiment, cyclohexane is used as absorbent, wherein the liquid hourly space velocity of cyclohexane and C4 fraction is shown in Table 4 ("hydrogen oil volume ratio" in the table is the feed mixture formed by hydrogen, cyclohexane and C4 fraction volume ratio).

[0033] . Other operating steps are approximately the same as in Example 1, except that the reaction process conditions shown in Table 4 are used. The composition of the C4 fraction before and after hydrogenation is shown in Table 5.

[0034] Table 4

[0035]

[0036] table 5

[0037]

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Abstract

A C4 fraction hydrogenation method is provided. The method includes: a step a) of dissolving a C4 fraction into an absorbent to obtain a feedstock mixture; a step b) of mixing the feedstock mixture with hydrogen, feeding the material mixture into a first-section reactor filled with a catalyst A, and performing hydrogenation; a step c) of mixing the reactor effluent of the first-section reactor with hydrogen, feeding the mixture into a second-section reactor filled with a catalyst B, and performing hydrogenation; and a step d) of separating the absorbent from the liquid-phase reaction effluent of the second-section reactor to obtain a C4 fraction hydrogenation product. The absorbent is one or more selected from benzene, toluene and cyclohexane. According to the method, the C4 fraction is dissolved with an inert solvent before hydrogenation, a two-section hydrogenation reaction process is adopted, unsaturated olefins in the C4 fraction are effectively subjected to hydrogenation saturation, high-quality cracking raw materials are provided, the problem that activity of a hydrogenation catalyst is liable to decrease is effectively overcome, and the hydrogenation efficiency is ensured.

Description

technical field [0001] The invention relates to a hydrogenation method for C4 fraction. Background technique [0002] The C4 fraction is the carbon four fraction, which refers to the hydrocarbon mixture containing four carbon atoms. The main components are n-butane, isobutane, isobutene, 1,3-butadiene, 1-butene, 2-butene (cis Formula 2-butene, trans-2-butene), etc. At present, many refineries in China are facing the problem of how to make rational use of C4 fractions. Generally, the C4 fraction is used as liquefied gas and has a low value. The C4 fraction of some refineries is unstable due to the high content of butadiene, so it can only be burned, and a certain amount of liquefied gas needs to be added for combustion, so the loss is even greater. If the C4 fraction is used as a cracking material, because it contains unsaturated olefins, side reactions such as polymerization, cyclization, condensation, and coking will occur in the cracking furnace. Therefore, it is prefe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C9/10C07C9/12C07C5/03
Inventor 张富春柴忠义任玉梅杜周季静
Owner CHINA PETROLEUM & CHEM CORP
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