Low-temperature Claus tail-gas hydrogenation catalyst and preparation method thereof

A hydrogenation catalyst, Claus tail gas technology, applied in catalyst activation/preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc. The effect of strong powdering ability, good hydrothermal stability and high lateral pressure strength

Active Publication Date: 2013-06-12
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The low-temperature Claus tail gas hydrogenation catalyst disclosed in Chinese patents CN101108349A and CN101108348 has a NiO content of 20% to 60%, a chromium oxide, copper oxide, and iron oxide content of 0% to 5%, and the remaining alumina is prepared by co-precipitation technology, SO 2 100% conversion to H 2 The minimum reaction temperature of S is 210°C, other sulfides such as CS 2 , COS and S conversion temperatures have not been investigated

Method used

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  • Low-temperature Claus tail-gas hydrogenation catalyst and preparation method thereof
  • Low-temperature Claus tail-gas hydrogenation catalyst and preparation method thereof
  • Low-temperature Claus tail-gas hydrogenation catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The concentration of 35gAl 2 o 3 / L of sodium metaaluminate solution is placed in the gelation tank, the gelation temperature is controlled at 0-25°C, and CO with a concentration of 40% is introduced. 2 The gas is neutralized, the metatitanic acid is beaten, the sodium silicate solution is diluted to a concentration of 5%, and the dry glue contains SiO 2 5% (m / m), TiO 2 30% (m / m), when controlling the pH of the glue solution to be 10, stop gelling. Then filter, wash with deionized water to PH=8-9, after drying, crush to about 180 mesh, the obtained pore volume is 0.82 ml / g, the specific surface area is 347 square meters / g, SiO 2 Content 5% (m / m), TiO 2 Silicon-modified titanium-aluminum composite dry glue with a content of 30% (m / m).

[0023] By changing the addition amount of metatitanic acid and sodium silicate, a series of silicon-modified titanium-aluminum composite dry glues with different titanium and silicon contents can be prepared. The physical and chemi...

Embodiment 2

[0027] Weigh 100 g of the silicon-modified titanium-aluminum composite dry glue prepared in Example 1, add it into a kneader, add 6 g of magnesium oxide, and 5 g of Tianqing powder, and stir evenly. Dissolve 4 grams (65%) of nitric acid in 80 ml of deionized water to make a nitric acid solution, add it into a kneader, and knead it into a block. On the extruder, use a Φ3mm clover-shaped orifice plate to extrude the strip and bake it at 110 ° C. Dry for 4 hours and bake at 550°C for 4 hours to make a series of MgO-SiO 2 -TiO 2 -AL 2 o 3 Composite carrier, its properties are shown in Table 2.

[0028] Table 2 Physicochemical properties of different carriers

[0029] carrier

Embodiment 3

[0031]Add 100g of deionized water and 15g of phosphoric acid into the reaction tank, heat to 70°C, dissolve 45g of ammonium molybdate and 9g of basic cobalt carbonate in deionized water with phosphoric acid, stir and dissolve until the solution is transparent, add 7.5g of nickel carbonate, Stir and dissolve until the solution is transparent, and prepare a purple transparent cobalt, molybdenum, nickel impregnation solution. Calculated based on the water absorption rate of the carrier of 40%, take 4ml of the impregnation solution and impregnate 10g of the A-1 carrier for 1h, then dry at 110°C for 4h, 400 It was calcined at ℃ for 4h to prepare catalyst A-1. The physical and chemical properties are listed in Table 3.

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Abstract

The invention relates to a Claus tail-gas hydrogenation catalyst and a preparation method thereof. The Claus tail-gas hydrogenation catalyst is mainly characterized in that a carrier of the catalyst is made of silicon modified titanium and aluminum composite dry glue, a cementing agent, a chambering agent and an auxiliary agent, wherein the auxiliary agent is one or more of zinc oxide, iron oxide, magnesium oxide or salts thereof; and an active component is a ternary active component consisting of molybdenum or tungsten and cobalt as well as nickel. The Claus tail-gas hydrogenation catalyst is prepared by adopting an immersion method preparation process. The catalyst has the characteristics of no pollution in the preparation process, low temperature SO2 hydrogenation activity, hydrogenolysis activity of organic sulfurs of CS2, COS and the like and good hydrolysis activity, can be used in a Claus tail gas hydrogenation process, and has remarkable energy-saving and consumption-reducing effects because the use temperature of the Claus tail-gas hydrogenation catalyst is lower than over 60 DEG C as comparison with the common Claus tail-gas hydrogenation catalyst.

Description

technical field [0001] The invention relates to a Claus (Claus) tail gas hydrogenation catalyst in the field of sulfur recovery and a preparation method thereof. Background technique [0002] With the increasingly stringent environmental regulations and the further enhancement of people's awareness of environmental protection, the requirements for the emission standards of sulfur compounds in petroleum processing and petrochemical plants are becoming more and more stringent. In order to meet the requirements of the new environmental protection standards, most of the treatment of sulfuric acid gas in refineries and natural gas purification plants adopts the sulfur recovery process, and the total sulfur recovery rate of the device must reach more than 99.80%. The sulfur recovery units all adopt the reduction absorption process. In the Claus+SCOT sulfur recovery process, the sulfuric acid gas enters the hydrogenation reactor after two-stage Claus conversion, and under the acti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/883B01J23/888B01J37/02B01J35/02B01D53/48B01D53/50
Inventor 刘爱华刘剑利陶卫东徐兴忠王建华郝国杨
Owner CHINA PETROLEUM & CHEM CORP
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