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Amine treating process for acid gas separation by using blends of amines and alkyloxyamines

A technology for acidic gases and mixtures, applied in separation methods, chemical instruments and methods, separation of dispersed particles, etc., can solve problems such as limited commercial utility, load capacity reduction of gas content, etc.

Inactive Publication Date: 2015-01-14
EXXON RES & ENG CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

reported that the tertiary amine MDEA has the ability to interact with CO 2 Compared to H 2 High selectivity of S absorption (Frazier and Kohl, Ind. and Eng. Chem., 42, 2288 (1950)), but its commercial utility is limited because of its limited H 2 S load capacity and its limited CO reduction gas 2 content capacity

Method used

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  • Amine treating process for acid gas separation by using blends of amines and alkyloxyamines
  • Amine treating process for acid gas separation by using blends of amines and alkyloxyamines
  • Amine treating process for acid gas separation by using blends of amines and alkyloxyamines

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] By containing 10%v / v CO at 40°C (absorbent and gas), 138kPag (20psig) 2 , 1%H 2 S, margin N 2 The gas mixture was bubbled through a stirred 2.17 mole aqueous amine mixture at a gas flow rate of 600 mL / min to test two ether amines in various ratios: tert-butylaminoethoxyethanol (EETB) and methoxy-triethylene glycol -Absorption characteristics of a mixture of tert-butylamine (MEEETB, tert-butylamino-ethoxyethoxyethyl methyl ether). The five gas ratios tested are (EETB / MEEETB): 100 / 0; 95:5; 90 / 10; 80 / 20 and 50:50.

[0095] The gas is introduced into the solvent solution under the dip tube, where the outlet is immersed just below the surface of the solvent (8mm). These parameters were found to provide stable and reproducible data on MDEA and other solutions. The test gas is saturated with water before entering the test unit. The variable speed paddle mixer circulates the solvent through the dip tube at a controlled rate. The unit operates at atmospheric pressure. The gas d...

Embodiment 2

[0098] Other studies conducted in the same way with ether amines and ether amine mixtures show that the mixture has H 2 The potential advantages of S selectivity and load are shown in Table 1 below:

[0099] Table 1

[0100]

[0101] Bis-SE = Bis-(tert-butylamino)-diethylene glycol

[0102] TEGTB=Triethylene glycol-tert-butylamine

[0103] TEG(TB) 2 =Bis-(tert-butylamino)-triethylene glycol

[0104] Load = H 2 The molar amount of S / the molar amount of absorbent

[0105] Capacity = H absorbed by the solution 2 Molar amount of S / H after desorption from solution 2 S molar amount

[0106] Therefore, even if TEGTB and TEG(TB) 2 Compared with MEEETB (219.32), the mixture has a molecular weight disadvantage (weight-average molecular weight of 241.61), but results in the purchase of fewer moles of absorbent per unit weight and the increased H generated by the two reaction sites on the two amine groups 2 S selectivity and load, approximately twice that of MEEETB, make the use of the mixture attrac...

Embodiment 3

[0108] Use the same method to use MDEA, EETB, MEEETB and a mixture of TEGTB and TEG(TB)2 (57.8% / 35%, unreacted TEG as the balance) continue to evaluate to show H 2 The relationship between S selectivity and a wide range of loads. The results are shown in image 3 in. MDEA has approximately the same selectivity as EETB, but only at very low loads, after which the selectivity deteriorates sharply at a higher rate. EETB has the advantage of linear selectivity under all loads. MEEETB and TEG mixtures are significantly more selective than EETB at low to medium loadings, where MEETB has marginal advantages, but a given loading doubling is provided by the bis-(amino) derivatives in the mixture (see Example 2), the mixture has Compared with other materials, obvious selectivity advantages.

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Abstract

A process for absorbing H2S and CO2 from a gas mixture containing both these gases comprises contacting the gas mixture with an absorbent combination of (i) primary absorbent component comprising a severely sterically hindered tertiary etheramine triethylene glycol alcohol or derivative of such an alcohol and (ii) secondary absorbent component for acidic gases comprising a liquid amine such as methyldiethylamine (MDEA), monoethanolamine (MEA), 2-amino-2-methyl-1-propanol (AMP), piperazine (PZ), diethanolamine (DEA), triethanolamine (TEA), diglycolamine (aminoethoxyethanol, DGA) and diisopropylamine (DIPA) another etheramine alcohol or diamine. By using the combination of amine absorbents, the overall selectivity of CO2 pickup can be maintained while retaining good H2S sorption selectivity; the selectivity of the combination for H2S and CO2 may be controlled over a range of gas loadings in the absorbent.

Description

Invention field [0001] The present invention relates to the absorption of acid gas from a mixed gas stream containing acidic and non-acidic components. [0002] Cross reference to related applications [0003] This application relates to the priority benefit of US Patent Application Serial No. 61 / 610,599 filed on March 14, 2012 under 35 USC 120 requirements. Background of the invention [0004] Well-established treatment of acidic gases such as CO with amine solutions 2 , H 2 S, CS 2 , HCN, COS and C 1 -C 4 The sulfur derivatives of hydrocarbons are gases and liquids to remove these acid gases. Amine is usually contacted with acid gas and liquid in the absorption tower as a solution containing amine, wherein the amine aqueous solution enters countercurrently with the acid fluid. In typical cases, common amine sorbents such as monoethanolamine (MEA), diethanolamine (DEA), methyldiethanolamine (MDEA), diisopropylamine (DIPA) or hydroxyethoxyethylamine (DGA) are used. The liquid amin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14C07C217/08
CPCB01D2252/20447B01D2252/20489B01D2252/502B01D2252/20405B01D2252/2026B01D2252/504B01D2252/20421C07C217/08Y02C10/06B01D2252/20431B01D2252/20484B01D53/1493B01D2252/2041B01D53/1462B01D2252/20426Y02C20/40
Inventor M·达格R·B·费迪施M·西什金
Owner EXXON RES & ENG CO
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