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Highly active nano iron catalyst for the absorption of hydrogen sulfide

A technology of adsorbent and iron hydroxide, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, iron oxide/iron hydroxide, etc.

Active Publication Date: 2016-02-24
NEW TECH VENTURES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Despite the commercial success of the products covered by U.S. Patent Nos. 7,744,841 and 7,943,105, there remains a need for improved absorbents capable of removing sulfur-containing compounds from liquid and / or gaseous streams, and especially hydrogen sulfide from hydrocarbon streams

Method used

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  • Highly active nano iron catalyst for the absorption of hydrogen sulfide
  • Highly active nano iron catalyst for the absorption of hydrogen sulfide
  • Highly active nano iron catalyst for the absorption of hydrogen sulfide

Examples

Experimental program
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Effect test

Embodiment 2

[0044] 1g siderite (mainly FeCO 3 ) was suspended in 60ml of 1M KOH solution by stirring with a magnetic stirrer and heated to 40-50°C until the color of the solid particles changed from light brown to black. This takes about 10-20 minutes. Once stirring was stopped, black particles settled to the bottom of the flask, showing a clear liquid phase at the top. They also agglomerate around the magnetic stir bar when the magnetic stir bar is not stirring due to its magnetic properties. The resulting suspension was analyzed using transmission electron microscopy, as figure 2 shown in . This demonstrates that the particles are generally in the range of 5-10 nm. This demonstrates that large particles not only react to stable iron(II) oxides and / or hydroxides, but they also deagglomerate to form iron nanoparticles.

[0045] 10 ml of the resulting suspension was introduced into a glass bubbler containing the spent blank caustic solution from Example 1, and 6000 ppm H 2 S / N 2 Th...

Embodiment 3

[0053] After reaching the breakout in Example 2, 10 ml of the adsorbent prepared in the same way as given in Example 2 were added again to the spent caustic solution in the bubbler. 6000ppm H 2 S / N 2 The suspension was passed again according to the procedure stated in Reference Example 1, and the system started to absorb H again 2 S. It is important to note that in this case the lifetime of the adsorbent is 10 h before the jump, which is shorter than the first time. Therefore, it is believed that OH - and Fe +2 The molar ratio between should preferably be at least 4-6:1. Without being bound by theory, it is currently believed that this ratio allows sufficient caustic to be able to convert the ferrous carbonate in siderite to ferrous oxide / hydroxide and to stabilize it so that it can subsequently absorb H 2 S. If the ratio is lower, the caustic is able to react the siderite, but it may not exhibit absorption of H 2 S long life. Furthermore, the fact that the alkaline ...

Embodiment 4

[0055] As discussed above, when the stabilized iron (II) oxide and / or hydroxide is exposed to water, the particle color changes spontaneously from black to brown. According to the Schikorr reaction, Fe 3 o 4 Formed when Fe(II) hydroxide is exposed to water. To probe the adsorption capacity of these iron species, 60 ml of water and 5 ml of stabilized iron(II) oxide and / or hydroxide in the 1M basic solution produced according to Example 2 were added to the bubbler. Then, 20sccm of 6000ppmH 2 S / N 2 feed into the bubbler, and at H 2 Samples lasting approximately 6 hours prior to the S jump were detected by GC in the exit gas. The pH of the sample was 12.6 before absorption and 9.6 after absorption. In this case the used sample was green in color and also showed a black precipitate at the bottom. In this case, again assuming a linear relationship between the initial concentration of KOH and the hours of absorption, 5 ml of 1M KOH would be expected to last 6 h before the jump...

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Abstract

The invention involves the formation of a stable iron (II) oxide and / or hydroxide. Preferably these oxides and / or hydroxides are present as nanoparticles in the 5-10 nanometer range. It has been discovered that such particles can be formed at lower cost and with fewer impurities by using ferrous carbonate (FeC03) from siderite as compared to known processes from various iron salts such as sulfates and chlorides. The novel nanoparticles are particularly adapted to removing sulfur compounds such as H2S from liquid and / or gaseous streams, such as hydrocarbon streams.

Description

technical field [0001] The present invention relates generally to sorbents suitable for the removal of hydrogen sulfide and other sulfur-containing species from liquid and / or gaseous streams, and more particularly to sorbents which are particularly suitable for absorbing sulfide from liquid and / or gaseous streams. Stable iron(II) oxides and / or hydroxides of hydrogen and other sulfur-containing species. Methods of making and using the adsorbent are also disclosed. Background technique [0002] Various liquid and / or gaseous streams, including hydrocarbon streams such as natural gas liquids ("NGL"), crude oil, acid gas mixtures, carbon dioxide gas and liquid streams, anaerobic gases, landfill gas, geothermal gases, etc., are also often Contains significant amounts of sulfur compounds (sulfurcompound). Some of the sulfur-containing compounds commonly found in this stream include hydrogen sulfide, mercaptans, and dimethyl disulfide. In the case of hydrocarbon streams in partic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/52
CPCC01G49/02C01P2004/04C01P2004/64B01D53/8612B01D2255/20738B01D2255/9202B01J20/06B01J23/745C10L3/103B01J20/0229C10L2290/542B01J20/28007C01G49/04C01G49/009C10G25/003Y02E50/30B01J35/23B01J35/27B01D53/04B01J20/3085B01D53/52
Inventor 韦罗尼卡·M·伊鲁尔松弗洛伊德·E·法尔哈
Owner NEW TECH VENTURES
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