Unlock instant, AI-driven research and patent intelligence for your innovation.

Catalyst for selectively oxidizing hydrogen sulfide to prepare sulfur and preparation method thereof

A selective oxidation and catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of poor water vapor resistance, low selectivity, excessive oxygen influence, etc. The method is simple and easy to operate, with high activity and high selectivity.

Active Publication Date: 2014-12-31
CHINA PETROLEUM & CHEM CORP
View PDF6 Cites 20 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the catalyst uses titanium dioxide as a carrier, it has poor water vapor resistance and can only be used to treat gases with anhydrous or low water content (less than 5%)
[0012] Existing hydrogen sulfide selective oxidation catalysts have problems such as low selectivity and catalyst activity greatly affected by water vapor and excess oxygen.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Catalyst for selectively oxidizing hydrogen sulfide to prepare sulfur and preparation method thereof
  • Catalyst for selectively oxidizing hydrogen sulfide to prepare sulfur and preparation method thereof
  • Catalyst for selectively oxidizing hydrogen sulfide to prepare sulfur and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044]Mix 187g of silicon dioxide and 10g of β-silicon carbide respectively, add 3g of calcium oxide, mix evenly with 4g of polyvinyl alcohol and 300g of distilled water, knead and extrude into strips of φ3mm, dry at 120°C for 4h, and roast at 600°C for 6h , the specific surface area of ​​the carrier thus prepared is 91m 2 / g, the average pore diameter is 23nm.

[0045] 65.1gFe(NO 3 ) 3 ﹒ 9H 2 O, 7.88gZn(NO 3 ) 2 .6H 2 O. Add 20ml of glycerin to water, mix well, impregnate the carrier prepared in the previous step with the obtained solution in equal volume, impregnate for 3 hours, dry at 120°C for 4 hours, and roast at 450°C for 6 hours. 6% (m), the amount of zinc oxide is 1% (m).

Embodiment 2

[0047] Mix 180g of silicon dioxide and 20g of β-silicon carbide respectively, add 3g of calcium oxide, mix evenly with 4g of polyvinyl alcohol and 300g of distilled water, knead and extrude into strips of φ3mm, dry at 120°C for 4h, and roast at 600°C for 6h , the specific surface area of ​​the carrier thus prepared is 78m 2 / g, the average pore diameter is 28nm.

[0048] 65.1gFe(NO 3 ) 3 ﹒ 9H 2 O, 7.88gZn(NO 3 ) 2 .6H 2 O. Add 20ml of glycerin to water, mix well, impregnate the carrier prepared in the previous step with the obtained solution in equal volume, impregnate for 3 hours, dry at 120°C for 4 hours, and roast at 450°C for 6 hours. 6% (m), the amount of zinc oxide is 1% (m).

Embodiment 3

[0049] Example 3: Mix 140g of silicon dioxide and 60g of β-silicon carbide, add 1g of calcium oxide, mix evenly with 4g of polyethylene glycol and 300g of distilled water, knead and extrude into a φ3mm strip, dry at 110°C for 4h, and Calcined at 500°C for 5 hours, the specific surface area of ​​the carrier thus prepared is 65m 2 / g, the average pore diameter is 31nm.

[0050] 65.1gFe(NO 3 ) 3 ﹒ 9H 2 O, 7.88gZn(NO 3 ) 2 .6H 2 0. Add 20ml of glycerin to water, mix evenly, impregnate the carrier obtained in the previous step with the same volume of the obtained solution, the impregnation time is 3h, dry at 110°C for 6h, and roast at 450°C for 6h, the catalyst thus prepared is oxidized The amount of iron is 6% (m), and the amount of zinc oxide is 1% (m).

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Average pore sizeaaaaaaaaaa
Carrier specific surface areaaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of sulfur recovery technology, and relates to a catalyst for selectively oxidizing hydrogen sulfide to prepare sulfur and a preparation method thereof. The catalyst is prepared by processing a carrier through an active dipping liquid, wherein the carrier is composed of silicon dioxide, beta-silicon carbide and a modifier, the active dipping liquid is composed of an active composition, an active auxiliary agent and a dispersant, the active composition is ferric oxide, and the active auxiliary agent is an oxide of a group II B element. The preparation method comprises: mixing silicon dioxide and beta-silicon carbide, adding a pore-enlarging agent, the modifier and water, performing kneading, extrusion molding, drying and roasting to prepare the carrier, adding the dispersant, the active composition and the active auxiliary agent into deionized water, dissolving to form a solution, using the active dipping liquid to dip the carrier, and then drying and roasting to obtain the product. The catalyst has the advantages of high selectivity, high activity, high in water resistance and excessive-oxygen resistance, high sulfur recovery rate and the like.

Description

technical field [0001] The invention belongs to the technical field of sulfur recovery, and relates to a catalyst for selectively oxidizing hydrogen sulfide into elemental sulfur and a preparation method thereof. Background technique [0002] With the increasingly stringent environmental protection standards, the country has stricter requirements on the emission concentration of air pollutants in the 12th Five-Year Plan, which will bring new opportunities and challenges to the development of selective oxidation technology. The conventional Claus+amine liquid absorption process, as one of the main processes for sulfur recovery, will not be able to meet the new emission standards, and the low-concentration H 2 S for further processing. In addition, many domestic small-scale refineries, coking plants, fertilizer plants, by-product H 2 The S content is low, and the scale of the sulfur recovery unit to be built is small. Generally, there is no tail gas treatment unit, and the S...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B01J27/224
Inventor 刘增让刘剑利刘爱华张义玲陶卫东张玉红张艳松郝国杨
Owner CHINA PETROLEUM & CHEM CORP