Influence of MEA and piperazine additives on the desulfurization ability of MDEA aqueous for natural gas purification

Abstract

The influence of monoethanolamine (MEA) and piperazine added into methyldiethanolamine (MDEA) aqueous solution on the desulfurization of natural gas was investigated by the method of equilibrium data determination in this paper. Four kinds of equilibrated systems, i.e. H 2 S-NG-MEA-water, H 2 S-NG-MDEA-water, H 2 S-NG-(MEA-MDEA)-water, H 2 S-NG-(MEA-MDEA-PZ)-water at the temperature ranging from 298.15 to 333.15 K were measured in a glass-jacketed gas absorption cell with a double-drive impeller device. The results show that the H 2 S partial pressure increases with the increase of H 2 S loading in liquid phase along an isotherm. The addition of MEA and PZ is beneficial for improving the desulfuration ability of MDEA. The ability of H 2 S absorption for the four mixed alkanolamine systems is MEA [ (MEA-MDEA-PZ) [ (MEA-MDEA) [ MDEA according to the order of size. The four equilibrium data can be well correlated with the Soave-Redlich-Kwong equation of state and electrolyte-NRTL activity coefficient model. The overall mean relative errors of total pressure and H 2 S partial pressure between the calculated and experimental data of the four systems are 3.30 and 3.07 %, respectively. The experimental and calculated results are very useful for desulfuration and purification process of natural gas or other industrial gases.

Unveiling the Quantitative Relationships between Electron Distribution and Steric Hindrance of Organic Amines and Their Reaction Rates with Carbonyl Sulfur: A Theoretical Calculation Investigation

“…For example, the molecule constructed by adding the methyl group to the α position of molecule A (hexane) was labeled as A-α-1. Three industrially applied compounds, − 1-amino-3-hexanol (A-γ-10), piperazine (B-β-19), and p -xylylamine (C-γ-1), were selected to represent linear aliphatic amines, cyclic aliphatic amines, and aromatic amines, individually.…”

Latest technological advances and insights into capture and removal of hydrogen sulfide: a critical review

“…Nguyen et al 65 and Dash et al 66 reported that the blends of amines and PZ possess lower volatility than the amines alone as the blends typically form non-ideal solutions. On the other hand, Yunhai et al 15 evaluated the performance of MEA, MDEA, a mixture of MEA and MDEA and a mixture of MEA, MDEA and PZ for H 2 S capture from natural gas streams. They reported that the performance of MEA was the highest followed by the mixture of MEA, MDEA and PZ, the mixture of MEA and MDEA and MDEA, respectively.…”

Hydrogen sulfide capture and removal technologies: A comprehensive review of recent developments and emerging trends

“…Yunhai et al [106] compared aqueous solutions of MEA, MDEA, MEA + MDEA, and MEA + MDEA + PZ for H 2 S absorption from pipeline natural gas that was supplemented with H 2 S during experiments. The ability of H 2 S absorption for the four systems is MEA > (MEA-MDEA-PZ) > (MEA-MDEA) > MDEA, demonstrating that addition of PZ increases the loading of H 2 S. However, this is not the case when both CO 2 and H 2 S are present in the feed gas.…”