C4 hydrocarbon catalysis and separation method capable of separating isobutene and butene-2

A technology for isobutene and C4-hydrocarbons, which is applied in the field of C4-hydrocarbons catalytic separation of isobutene and butene-2, which can solve the problems of low isomerization rate of butene-1 double bond, low purity of isobutene, complicated separation methods, etc.

Active Publication Date: 2010-11-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is the technical problem of low butene-1 double bond isomerization rate, low isobutene purity and complicated separation method in the prior art

Method used

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  • C4 hydrocarbon catalysis and separation method capable of separating isobutene and butene-2
  • C4 hydrocarbon catalysis and separation method capable of separating isobutene and butene-2
  • C4 hydrocarbon catalysis and separation method capable of separating isobutene and butene-2

Examples

Experimental program
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Embodiment 1

[0015]A reactive distillation column with a diameter of 10 cm and a height of 20 meters has a total of 100 trays from the bottom to the top of the column, numbered 1, 2, 3, ... 100 in sequence. Two layers of catalysts are filled in the tower, and the catalyst of the lower layer is loaded on the 30th plate with a loading capacity of 20 liters. The upper catalyst is loaded on the 60th tray with a loading capacity of 14 liters. The remainder of the tower is filled with 1.5 cm long porcelain rings. The upper bed catalyst selects the catalyst to include the following components in weight percent: (a) 20.0% NiO oxide; (b) 1.0% cerium oxide; (c) 0.2% magnesium oxide; (d) the remainder Alumina carrier. The catalyst in the lower bed layer is selected from a) 40% nickel or its oxide; b) 5% titanium oxide; c) the balance of carrier alumina; wherein the precursor of carrier alumina is aluminum sol. C4 material enters the reactive distillation column from the 29th tray, and hydrogen ent...

Embodiment 2

[0020] A reactive distillation column with a diameter of 10 cm and a height of 20 meters has a total of 100 trays from the bottom to the top of the column, numbered 1, 2, 3, ... 100 in sequence. One deck of catalyst is packed in the tower, and the catalyst is loaded on the 40th plate, and the loading capacity is 30 liters. The remainder of the tower is filled with 1.5 cm long porcelain rings. The catalyst is selected to include the following components in weight percent: (a) 30.0% NiO oxide; (b) 2.0% cerium oxide; (c) 0.2% magnesium oxide; (d) 3% titanium oxide ; (e) the remainder of the carrier alumina. The precursor of the carrier alumina is aluminum sol. C4 material enters the reactive distillation column from the 30th tray, and hydrogen enters from the 35th tray. The operating temperature at the bottom of the tower is 60°C, and the pressure at the bottom of the tower is 0.6MPa; the operating temperature at the top of the tower is 50°C, and the pressure at the top of the...

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Abstract

The invention relates to a C4 hydrocarbon catalysis and separation method capable of separating isobutene and butene-2, mainly solving the technical problems that in the prior art, the rate of double-bond isomerism of butane-1 is low, the purity of isobutene is low and the separation method is complicated. The method of the invention comprises the following steps: feeding C4 fraction containing butane-1, butene-2 and isobutene and hydrogen in a rectifying tower reactor containing one or two Ni-based catalyst beds, using butadiene in C4 fraction to prepare butene-2 through selective hydrogenation, or using butadiene to react with thiol compound in C4 fraction and prepare thioether with higher boiling point, performing hydroisomerization of the double bond of butane-1 to approach the equilibrium concentration of butene-2, continuously breaking the thermodynamic equilibrium between butane-1 and butene-2 through the rectification process, separating butane-1, butene-2 and sulfur-containing compound with isobutene, using isobutene as overhead product to remove and removing the residual material from the tower bottom. Therefore, the problems are better solved and the method can be used in the industrial production of using ethylene plants to crack C4 hydrocarbon or the industrial production of using refinery C4 hydrocarbon to prepare high-purity isobutylene.

Description

technical field [0001] The invention relates to a method for catalytically separating isobutene and butene-2 ​​from C4 hydrocarbons. Background technique [0002] C4 hydrocarbons mainly include steam cracking C4 in ethylene plants and C4 hydrocarbons in refineries. C4 in cracking and C4 in refinery contain varying amounts of butadiene, n-butene (butene-1, butene-2), isobutene, isobutane, n-butane, etc. These components are used A wide range of important chemical raw materials, among which carbon tetraolefins have higher added value, especially isobutene. However, the difference between the boiling points of isobutene and butene-1 is only 0.6°C, and the difference in relative volatility is only 0.03. It is difficult to separate the two by general rectification methods. At present, domestic high-purity isobutene is mainly produced by MTBE cracking method (CN1853772). Other methods for producing isobutene include tert-butanol dehydration (CN1609082) and the like. The produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/08C07C11/09C07C7/04C07C7/163C07C7/148B01J23/755
Inventor 刘仲能王建强赵多侯闽渤吴征任杰
Owner CHINA PETROLEUM & CHEM CORP
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