Preparation method of catalyst for alkyne selective hydrogenation

A technology for selective hydrogenation and catalysts, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc. poor selectivity

Active Publication Date: 2015-06-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Precious metal catalysts have good low-temperature activity and mild reaction conditions, but their disadvantages are that the active components of the catalyst are easy to lose, expensive, difficult to regenerate, and slightly poor in hydrogenation selectivity
During this type of hydrogenation reaction, the semi-hydrogenated free radicals adsorbed on the catalyst react with adjacent alkynes or dienes to form a viscous polymer (commonly known as green oil), which is mainly composed of C 6 The above compound composition, because it covers the surface of the catalyst, blocks the micropores on the surface of the catalyst, reduces the activity of the catalyst, and affects the service life of the catalyst

Method used

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  • Preparation method of catalyst for alkyne selective hydrogenation
  • Preparation method of catalyst for alkyne selective hydrogenation

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Experimental program
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Effect test

Embodiment 1

[0048] Embodiment 1—preparation of catalyst 1

[0049] Firstly, a titania-alumina composite oxide carrier was prepared according to the method in Example 1 of CN1184289C. Take the specific surface area as 160m 2 / g, 90g of clover-shaped alumina with a pore volume of 0.58mL / g and a most probable pore diameter of 130 angstroms, impregnated with 0.557g / mL dilute sulfuric acid solution of 63 ml of titanium sulfate, stirred for 15 minutes, and dried at 120°C for 8 hours Then, it was calcined at 900° C. for 4 hours to obtain a titanium oxide-alumina composite oxide (A-1). The obtained composite oxide had a titanium oxide content of 10% by weight and a specific surface area of ​​144m 2 / g, the pore volume is 0.56mL / g, and the most probable pore diameter is 125 angstroms.

[0050] Prepare 63mL of a mixed aqueous solution containing copper nitrate, ammonium phosphate, and iridium trichloride as the immersion solution. In the immersion solution, the amount of copper nitrate is 10% by...

Embodiment 2

[0051] Embodiment 2—preparation of catalyst 2

[0052] Prepare 63mL of a mixed aqueous solution containing copper nitrate, iridium trichloride, ammonium phosphate, and zirconium nitrate as the impregnating liquid. In the impregnating liquid, the amount of copper nitrate is 8% by weight calculated as copper element, and the amount of iridium trichloride is calculated as iridium element The amount of ammonium phosphate was 0.5% by weight, the amount of ammonium phosphate was 3% by weight as phosphorus element, and the amount of zirconium nitrate was 0.5% by weight as zirconium element. At room temperature, take 100g of titanium oxide-alumina composite oxide (A-1), impregnate it with the previously prepared impregnation solution, dry it at 120°C for 4 hours, then calcinate it at 500°C for 4 hours, take it out and cool it to room temperature . The catalyst prepared in this way is designated Catalyst 2.

Embodiment 3

[0053] Embodiment 3—preparation of catalyst 3

[0054] Prepare 63mL of a mixed aqueous solution containing copper nitrate, iridium trichloride, ammonium phosphate and nickel nitrate as the immersion solution, in the immersion solution, the amount of copper nitrate is 7% by weight calculated as copper element, and the amount of iridium trichloride is calculated as iridium element The amount of ammonium phosphate was 0.3% by weight, the amount of ammonium phosphate was 2% by weight as phosphorus element, and the amount of nickel nitrate was 3% by weight as nickel element. At room temperature, take 100g of titanium oxide-alumina composite oxide (A-1), impregnate it with the previously prepared impregnation solution, dry it at 120°C for 4 hours, then calcinate it at 500°C for 4 hours, take it out and cool it to room temperature . The catalyst prepared in this way is designated Catalyst 3.

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Abstract

The invention relates to a supported copper-base catalyst for alkyne selective hydrogenation. The catalyst comprises a carrier and following components loaded on the carrier: (a) 5 to 15 wt% of copper, (b) 0.5 to 3 wt% of iridium, (c) 0.5 to 3 wt% of phosphor, and optional zirconium and / nickel. The carrier is preferably chosen from aluminum oxide, titanium oxide, silicon oxide, titanium oxide-aluminum oxide, titanium oxide-silicon oxide, or aluminum oxide-silicon oxide, and most preferably, the carrier is titanium oxide-aluminum oxide. The catalyst can be used to eliminate alkyne in C4 fraction through hydrogenation, has the advantages of high catalytic activity, high selectivity, good stability, and long service life, and is capable of preventing sulfur and arsenic poisoning.

Description

technical field [0001] The invention relates to a preparation method of an alkyne selective hydrogenation catalyst, which is used for hydrogenation removal of C 4 Alkynes in fractions. Background technique [0002] 1,3-butadiene as a raw material for synthetic rubber is mainly a by-product of cracking ethylene 4 Separated from the distillate. Synthetic rubber requires that the total content of alkynes in 1,3-butadiene raw materials should be less than 20ppm, of which vinyl acetylene is less than 5ppm, so it is required to start from C 4 While separating 1,3-butadiene from the distillate, alkynes must be removed as much as possible. [0003] There are many methods for removing alkynes and separating 1,3-butadiene, including solvent extraction, solvent absorption, chemical adsorption, catalytic polymerization and catalytic selective hydrogenation. The traditional process is the solvent extraction method. This method undergoes first extraction, second extraction, de-light d...

Claims

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Application Information

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IPC IPC(8): B01J23/89C07C7/167C07C11/167
Inventor 杜周柴忠义纪玉国任玉梅张富春季静
Owner CHINA PETROLEUM & CHEM CORP
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