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The VSPP set up at HWP-Talcher is intended for synthesis of D2EHPA, TOPO, TAPO & DNPPA. In the synthesis of D2EHPA, the entire process is divided into two Groups of operations. Each group operation is carried out in series in two different Reactors. The first set of operations consists of the operation steps 1 & 2 i.e. up to chlorination of DOP and is carried out in the 1st Reactor. After processing as above, the same charge is transferred into 2nd Reactor to take up second set of operation i.e. steps 3 to 5.
The first Reactor is then made ready to take up first set of operation of the next batch parallel with the operation of second Reactor for 1st batch.
The Synthesis process involves mainly five steps as given below:
Reaction medium : n-Hexane
PCl3(l) + 3ROH(l) ---------> (RO)2(O)H(l) + RCl(l) + 2HCl(g)
(Di-Octyl Phosphite, DOP)R = C8H17 ( 2 Ethyl Hexyl radical )
(RO)2(O)H (l) + Cl2 (g) ---------> (RO)2(O)Cl (l) + HCl (g)
(Di-Octyl Phosphochloridate)R = C8H17 (2 Ethyl Hexyl radical)
(RO)2(O)Cl (l) + NaOH ---------> (RO)2(P)(O)OH + NaCl (aq)
(D2EHPA)R = C8H17 (2 – Ethyl Hexyl radical)
Last updated on: 08-Feb-2019