Page 159 - CW E-Magazine (13-5-2025)

Special Report

A rapid wrap-up of what’s new in Operations,

Processes and Products

Separation Technology

Single-step purifi cation of
p-xylene(PX) from xylene
isomers through a synergistic
combination of two robust
Al-based MOFs

PX is a multi-million tonnes per annum
product required for PTA to make poly-
ester fi bres/fi lms/resins and very high
purity is required. G. Huang et al have
reported that MIL-160 has preferential
adsorption of MX over PX and OX (This

Separation Technology out with the title membranes for the
above separation. Binary and multi-com-
ponent separation was examined. These
Effi cient separation of linear membranes have long term stability. The is uncommon). Theoretical calculations
and mono-branched hexane large-area membrane gave n-hexane were also done. Synergetic mixed beds
isomers using large-area permeance of 2.4 x 10 mol per sq.m of MIL-160 and CAU-23 gave enhanced
-8
silicalite-1 membranes per sec per Pa and the separation factors productivity of PX. Thus, a one-step
with respect to 2 MP and 3 MP were 36 efficient purification of PX from
For steam cracking n-hexane is desirable and 74, respectively. Scaling up was xylene isomers has been realised. (Sepn.
as it gives higher yields of C H /C H . done. (Sepn. Purfn. Technol., 2025, 354, Purfn. Technol., 2025, 354, part-5,
4
2
3
6
By contrast methyl pentane, are desir- Part-5, 19 Feb, 129115; DOI:10.1016/j. 19 Feb., 129129; DOI:10.1016/j.sep-
able in gasoline. K. Yu et al have come seppur.2024.129115). pur.2024.129129).
Nanofi ltration membrane
(NFM) for Mg and Li
separation from salt-lake
brine

L. Zhang et al have reviewed the title sepa-
ration and merits and demerits of NFM
are discussed. Future challenges are out-
lined. Five type of NFM are covered: (1)
Negatively charged NFM; (2) Positively
charged NFM; (3) Mixed-charged NFM;
(4) Size-sieving NFM; and (5) Bionic
NFM. These authors recommend that the
hollow fi bre NFM fabricated via layer-

Chemical Weekly May 13, 2025 159

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