Page 173 - CW E-Magazine (13-2-2024)

Special Report

sorption and show the crossover and 50°C and 3 bar. For 50-50 propane-pro- Novel amino acid ionic liquids
this is revealed through single-crystal pylene molar mixture, propylene purity prepared via one-step location
XRD. (Angew. Chem. Intl. Ed.; DOI: of 98.8% was obtained with a recovery hydrolysis for the highly effi-
10.1002/anie.202308438). of 98%. (Ind. Eng. Chem. Res., 2023; cient capture of CO
DOI: 10.1021/acs.iecr.3C01601). 2
Chiral purification of S-methyl- S. Wen et al have, for the first time,
2-chloropropionate from Adsorption of CO 2 made a series of amino acid ionic liquids
enantiomer mixture by three- [This column has covered many papers (AAILs) via one-step hydrolysis of
phase crystallisation (TPC) on this subject, including new amines, cheap lactams for the capture of CO .
2
including hindered amines first sug- The structures of these were determined.
L-D. Shiau and M-H. Hsu have adopted gested by M.M. Sharma in early 1960’s; These AAILs are reversible absor-
TPC from liquid enantiomer mixture ways of speeding CO desorption from bents with very high absorption. These
2
with various initial concentration. TPC loaded absorbents; etc. In view of cli- products have considerable potential.
combines melt crystallization and vapori- mate change and in pursuit of reducing (AIChE Jl, 2023; DOI: 10.1002/aic.
zation to produce the desired crystalline capital cost and energy consumption this 18206).
solid along with the vapour from the subject continues to attract attention.]
liquid feed via a series of three-phase Catalytic absorption pathway
transformation. (Chem. Eng. Technol., Carbonic anhydrase (CA) tex- with kinetically favourable
2023; DOI: 10.1002/ceat.202200587). tile structured packing for dissolution of NO in aqueous
efficient absorption in MDEA absorbents
Propane and propylene separa- solvent
tion with CO at mild tempera- [CA is referred in literature in 1930’s Z. Lian et al have referred to the neces-
2
tures by gas-phase simulated onwards, including its application in sity of taking care of NO from emissions.
moving bed (SMB) in binderless spaceships and submarines and is of It is generally inefficient in aquatic
zeolite 13X relevance in human body. However, it is absorbent. These authors have come
not stable at higher temperatures.] out with sterically hindered imidazole
R. Seabra et al have worked on the title to regulate the gas-liquid interface of
separation (which has been covered in M. Xiao et al have worked on reducing typical K S O solution. This results
8
2
2
this column many times in view of high the need for frequent CA replacement and in increasing the rate of absorption
capital and energy consumption in cryo- to avoid accumulation of inactive CA, a and capacity. Mechanism is explained.
genic, high-pressure based separation) strategy of immobilization is given where (AIChE Jl, 2023; DOI: 10.1002/aic.
using CO as a desorbent and binder- CA is fixed in a second-generation design 18197).
2
less Zeolite BX as adsorbent, at 50°C. of textile structured packing (CATS2)
Equilibrium data were obtained from modules. This will allow column size to One ethane-selective MOF with
50°C to 150°C and pressure up to 5 bar. be reduced and reduce capex. (AIChE Jl, customized pore size and specific
Breakthrough experiments were done at 2023; DOI: 10.1002/aie.18191).
binding sites for efficient
purification of C H
2
4
[This column has covered many papers
for the separation of C H /C H and
2
4
6
2
C H /C H by adsoptive methods and
6
3
3
8
this continues to attract attention to
reduce capex and energy cost.]
P. Guo et al have worked on the difficult
problem of C H (an impurity in C H )
2
6
4
2
separation, which becomes challenging
as C H and has smaller kinetic dia-
2
4
meter and larger quadrupole moment.
An ultra-microporous MOF (PCP-bdc)
with customized pore size and specific
Chemical Weekly February 13, 2024 173
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