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1, 3-butadiene production process by C4 selective hydrogenation

A technology for selective hydrogenation and butadiene, applied in the fields of hydrocarbons, chemical instruments and methods, and purification/separation of hydrocarbons, which can solve the problems of large butadiene loss, difficult catalyst regeneration, harsh hydrogenation conditions, etc. Achieve the effect of less harsh operating conditions, mild operating conditions and extended service life

Active Publication Date: 2012-10-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems of harsh hydrogenation conditions, large butadiene loss and difficult catalyst regeneration, the present invention proposes a process or method for producing 1,3-butadiene by selective hydrogenation and removal of alkyne from C4 fractions

Method used

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  • 1, 3-butadiene production process by C4 selective hydrogenation
  • 1, 3-butadiene production process by C4 selective hydrogenation
  • 1, 3-butadiene production process by C4 selective hydrogenation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Preparation of Catalyst A

[0047] Accurately weigh 1Kg of aluminum hydroxide powder produced by the nitric acid method, and accurately weigh lanthanum nitrate in such an amount that the catalyst finally prepared contains 1.5% lanthanum, and is dissolved in water. Alumina powder, lanthanum nitrate solution, nitric acid and water are kneaded, extruded into a gear shape, dried at 120°C for 10 hours, and calcined at 850°C for 4 hours to obtain lanthanum-containing alumina carrier La-Al 2 o 3 .

[0048] Measure an appropriate amount of palladium nitrate solution so that the catalyst that is finally prepared contains 0.3% palladium, and it is diluted with water to La-Al 2 o 3 Saturated water absorption of the carrier, spray the resulting palladium solution on the La-Al 2 o 3 on the carrier, dried at 120°C for 10 hours, and calcined at 450°C for 4 hours to obtain Pd / La-Al 2 o 3 .

[0049] Accurately weigh lead nitrate, its consumption makes the catalyst that finally m...

Embodiment 2

[0056] Preparation of Catalyst C

[0057] The preparation method is the same as in Example 1, except that a mixed solution of lanthanum nitrate and praseodymium nitrate is added during the kneading process of alumina powder to make Pb / Pd / La-Pr-Al 2 o 3 .

[0058] The obtained catalyst C contained 0.3% of Pb, 0.3% of Pd, 1.5% of La and 0.5% of Pr.

Embodiment 3

[0059] The preparation of embodiment 3 catalyst D

[0060] The preparation method is the same as in Example 1, except that a mixed solution of lanthanum nitrate and neodymium nitrate is added during the kneading process of alumina powder to make Pb / Pd / La-Nd-Al 2 o 3 .

[0061] The obtained catalyst D contained 0.3% of Pb, 0.3% of Pd, 1.5% of La and 1% of Nd.

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Abstract

The 1, 3-butadiene production process of the invention belongs to olefin production technology, and aims to solve problems of diseconomy and unsafety of a traditional butadiene extraction method. In the presence of a catalyst, a (two stage) fixed bed reactor is employed. Process conditions include: an entrance temperature of 30-60 DEG C, pressure of 0.6-2.0 MPa, carbon four liquid space velocity of 10-60 h <-1>, and hydrogen acetylene ratio of 0.2-10. The catalyst consists of an alumina carrier, 0.01-1wt% of Pd, 0.01-5wt% of Pb and one or several rare earth elements selected from La, Pr and Nd with a total content of 0.01-10wt%. The method lowers total alkynes in the C4 fraction to ppm level, and has little butadiene loss and realizes repeatedly recycled butadiene, so as to solve a ''bottleneck'' problem of the traditional butadiene production; besides, a secondary extraction can be canceled to greatly improve processing ability of the butadiene unit. Therefore, the method has high industrial application value.

Description

technical field [0001] The present invention relates to a method for producing 1,3-butadiene by selective hydrogenation to remove alkynes in C4 fractions, in particular to a method for selective hydrogenation and removal of alkynes from mixed C4 fractions produced by ethylene cracking units. Alkyne to 1.3-butadiene process. Specifically, the method for producing 1,3-butadiene is converted into 1,3-butadiene, 1-butene and propylene through the hydrogenation catalyst of the present invention to convert the alkyne in the carbon four cuts into 1,3-butadiene. Background technique [0002] During the high-temperature pyrolysis of hydrocarbon steam to produce ethylene, a certain amount of C4 fractions will be produced by-product. In addition to containing about 40-60 wt% of 1,3-butadiene in these carbon four cuts, it also contains about 0.5-2.0 wt% of vinyl acetylene (VA), 0.1-0.3 wt% of ethyl acetylene ( EA) and 0.01 to 0.10 wt% of methylacetylene (MA). In order to obtain high-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/167C07C7/167B01J23/63
CPCY02P20/584
Inventor 朱云仙戴伟杨栋乐毅彭晖高树升汪晓菁徐立英
Owner CHINA PETROLEUM & CHEM CORP
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