Rare earth hydroxide catalyst for moderate/low temperature carbonyl sulfur hydrolysis and preparation method thereof

A technology of rare earth hydroxides and rare earth oxides, applied in the direction of metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of low COS content and low space velocity in feed gas , decreased activity, and the need for regular regeneration, etc., to achieve the effect of simple preparation method, high activity at medium and low temperature, and large operating flexibility

Inactive Publication Date: 2005-03-16
TONGJI UNIV
View PDF6 Cites 22 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] USP 4,455,446 discloses a γ-Al 2 o 3 The COS hydrolysis catalyst loaded with platinum chloride has the disadvantage of high catalyst cost and the need for periodic regeneration
[0005] Chinese patent CN 1069673 discloses a normal temperature organosulfur hydrolysis catalyst, which is made of spherical γ-Al 2 o 3 2-5% K on load 2 CO 3 , the disadvantage of this catalyst is that the COS content and space velocity of the raw gas processed are relatively low, respectively 1-5mg/m 3 and 2,000hr -1
[0007] Chinese patent CN 1134312 discloses a kind of by 4-20wt% TiO 2 and γ-Al 2 o 3 Composed of organosulfur hydrolysis catalysts, the disadvantage of this catalyst is that the space velocity is only 1,800hr -1
[0008] Chinese patent CN 1189394 discloses a COS hydrolysis catalys

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0028] Example 1

[0029] (1) Weigh La 2 O 3 Sample 10g, add 100ml deionized water, hydrothermally heat at 95°C for 2.5 hours to a colloidal shape, let it stand for 2 hours, then dry at 110°C for 24 hours, compress and sieving a sample of 40-60 mesh lanthanum hydroxide;

[0030] (2) Put the lanthanum hydroxide in a fixed-bed quartz reactor (Φ8×300mm) at a temperature of 100℃ and a space velocity of 5,000hr -1 , Under the condition of 150ppm COS content, the COS conversion rate is 94%.

Example Embodiment

[0031] Example 2

[0032] (1) Weigh 0.25 g of KOH sample and dissolve it in 30 ml of deionized water, add the KOH solution to La(OH) prepared according to Example 1. 3 In the colloid, stir for 2 hours, let it stand for 2 hours, then dry at 120°C for 24 hours, and take a 40-60 mesh sample after tableting and sieving;

[0033] (2) Install the two-component catalyst in the reactor as described in Example 1, at a temperature of 80°C and a space velocity of 5,000hr -1 Under the condition of COS content of 150ppm, the COS conversion rate is 92.2%.

Example Embodiment

[0034] Example 3

[0035] Take the La(OH) prepared in Example 1 3 , At a temperature of 125°C and a space velocity of 5,000-40,000hr -1 , Under the condition of 150ppm COS content, the conversion rate of COS is shown in Table 1:

[0036] Table 1 Airspeed vs. La(OH) 3 Effect of catalyst COS hydrolysis activity

[0037] Airspeed, hr -1 5,000 10,000 20,000 30,000 40,000

[0038] COS conversion rate,% >99.0 98.6 98.0 97.5 97.2

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

No PUM Login to view more

Abstract

The invention relates to a kind of rare-earth hydroxide catalyst with medium-low carbonyl sulfur hydrolysis and its manufacturing method. The catalyst of the invention is rare earth hydroxide, and chemical molecular formulas of it are: Re(OH)3, on which Re is stood for La, Pr, Nd, Sm, Eu, Gd. Compared with the existing COS hydrolysis catalyst, the catalyst of the invention has the advantages of \ high medium-low activity, great operating elasticity, excellent resistibility of oxygen and sulfur, simple manufacturing method and so on. When the concentration of oxygen in virgin gas is less than 2%, the catalyst activity has no influence; furthermore, when the virgin gas contains oxygen and hydrogen sulfide at the same time, the influence of catalyst activity can be neglected.

Description

technical field [0001] The invention belongs to a catalyst for removing organic sulfur, in particular to a catalyst for hydrolysis of carbonyl sulfide and a preparation method thereof. Background technique [0002] Carbonyl sulfide (COS) widely exists in the chemical production process using coal, natural gas and petroleum as raw materials. Its existence not only pollutes the environment, but also causes catalyst poisoning, equipment corrosion and product quality degradation in the subsequent production process. COS hydrolysis is the most practical method for removing organic sulfur, and its process is: <chemistry num="001"> <chem file="200410025468_cml001.xml" / > < / chemistry> , under the action of a hydrolysis catalyst, use the water vapor in the tail gas or raw gas to convert COS into easier-to-handle inorganic hydrogen sulfide, and finally recover the sulfur element in the form of sulfur. [0003] U.S. Patent USP 4,455,446 discloses a 2 o 3 The disa...

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): B01D53/48B01D53/86B01J23/10
Inventor 马建新周伟邬敏忠
Owner TONGJI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap