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Synergistic H2S/mercaptan scavengers using glyoxal

A kind of technology of dialdehyde and thiol, applied in the field of removing H2S and/or thiol

Active Publication Date: 2013-12-18
BAKER HUGHES HLDG LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Acrolein is an effective scavenger, but operators dislike the use of this highly toxic substance

Method used

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  • Synergistic H2S/mercaptan scavengers using glyoxal
  • Synergistic H2S/mercaptan scavengers using glyoxal
  • Synergistic H2S/mercaptan scavengers using glyoxal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Such as figure 1 as shown, figure 1 It is used to remove H from oil under the conditions of 1 atmospheric pressure (0.1MPa) and 25°C 2 Normalization H of S as a function of time 2 Graph of S concentration where the oil contains 3000ppm H 2 S and 5% CO 2 . The curve (triangle) for glyoxal (40% in water) alone shows that at about 18 minutes H 2 The amount of S decreased to the lowest level and then gradually increased with the consumption of glyoxal. The curve (dots) of glyoxal and alkali (KOH) in a weight ratio of 90 / 10 (total 100 ppm) (glyoxal in 36% water) shows H 2 S decreased more and faster with a minimum slightly above 0.6, which shows that the presence of H 2 S is reduced even more. In addition, even after treatment with a composition as described herein, the presence of H 2 S gradually increased, but did not reach the levels obtained with glyoxal alone over a period of 90 minutes.

Embodiment 2

[0040] Such as figure 2 as shown, figure 2 is shown as a function of various weight ratios of base (KOH) / glyoxal (100 ppm total each time, where glyoxal is still in a 40% by weight aqueous solution) at 1 atmosphere (0.1 MPa) and 25°C h 2 Graph of S absorption test results showing the greatest reduction in hydrogen sulfide where the oil contained 3000 ppm H 2 S and 5% CO 2 , and express the cleared H in ppm 2 S. It can be seen that the best performance is obtained when the weight ratio is 10 / 90. image 3 Displays H in ppm / min under the same conditions 2 S Clearance rate. It can be clearly seen that when alkali / glyoxal weight ratio is 10 / 90, compared with only using alkali ( figure 2 with image 3 to the left of ) and using only glyoxal ( figure 2 with image 3 with an unexpected clear H 2 The peak of S ( figure 2 ) and clearance rate ( image 3 ). The dashed lines in both figures represent the expected smooth change from base alone to glyoxal alone (additive...

Embodiment 3

[0042] Such as Figure 4 as shown, Figure 4 is shown as nitrogen-free surfactant (ethoxylated C12 alcohol) / glyoxal at 1 atmosphere (0.1 MPa) and 25°C in various weight ratios (total of 100 ppm each time, where glyoxal remains H as a function of 40% by weight aqueous solution) 2 Graph of S absorption test results showing substantial absorption where the oil contains 3000 ppm H 2 S and 5% CO 2 , and express the cleared H in ppm 2 S. In this graph, the synergistic effect of including nitrogen-free surfactants in different weight ratios can be seen. Figure 5 Displays H in ppm / min under the same conditions 2 S Clearance rate. It can be clearly seen that the surfactant / glyoxal weight ratio of 20 / 80 has an unexpected H 2 S cleared peak ( Figure 4 ), and unexpected H at a surfactant / glyoxal weight ratio of 10 / 90 2 The peak of S clearance rate ( Figure 5 ). The dashed lines in both figures represent the expected smooth change from using only nitrogen-free surfactants t...

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PUM

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Abstract

The use of neutral aqueous solutions of glyoxal (pH approximately 6 to 8.5) scavenges H2S that is present in natural gas and in oil better than glyoxal alone or base alone. The resulting scavenger combination significantly increases the reaction rate and the overall scavenging efficiency, i.e. capacity over glyoxal used alone. A buffer may be optionally used. In another embodiment, the combination of non-nitrogen-containing surfactants and glyoxal results in a significant increase in the reaction rate and the overall scavenging efficiency, i.e. capacity as compared to glyoxal used alone.

Description

technical field [0001] The present invention relates to the removal of H from fluids 2 Methods and compositions of S and / or thiols, more specifically, in one non-limiting embodiment, involve the use of glyoxal and base and / or nitrogen-free surfactants to scavenge H from fluids 2 Methods and compositions of S and / or thiols. Background technique [0002] H 2 S and / or thiols. Exist H 2 S and mercaptans are objectionable because they often react with other hydrocarbons in the fuel system composition. h 2 Another reason S and mercaptans are objectionable is that they tend to be highly corrosive. H is not expected to exist 2 Another reason for S and mercaptans is that they have a very noxious odor. H is also known to be sensed by the human nose at relatively low concentrations 2 S and mercaptan odor. For example, mercaptans are commonly used to add odor to natural gas as a repellent for skunks and other animals. [0003] Main H for natural gas and crude oil 2 S and thi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G29/24C10G29/02C10L3/10C07C7/20
CPCC09K8/52C09K2208/20C10G19/02C10G29/04C10G29/06C10G29/20C10G29/22C10G29/24C10G2300/202C10G2300/207
Inventor S·拉玛钱德兰V·乔范西塞维克K·C·卡塔纳克M·P·斯奎克查里尼
Owner BAKER HUGHES HLDG LLC
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