Method for mitigating HCL generation during 1,1,2,3-tetrachloropropene purification

摘要

This invention is directed to a method for mitigating HCl generation during 1230xa purification, which comprises the steps of; (a) adding a chelating agent into 1230xa crude, and (b) conducting the 1230xa purification in the presence of said chelating agent at a quantity sufficient to reduce or prevent 1230xa decomposition. Examples of chelating agent include tributyl phosphate (TBP), tripropyl phosphate (TPP), and triethyl phosphate (TEP). The concentration of chelating agent in 1230xa crude can range from 0.001 to 20 wt %, preferably from 0.01 to 10 wt %, and more preferably from 0.1 to 5 wt %.

主权项

1. A method for preventing the degradation of 1230xa during its purification, which comprises the following steps:
(a) providing a crude composition comprising 1230xa and one or more Lewis Acid metal ions selected from the group consisting of Fe3+, Al3+, La3+, Cr3+, Ni2+, Cu2+, and combinations thereof; (b) adding at least one chelating agent to the crude composition, wherein the chelating agent comprises a trialkyl phosphate with a generic formula of R3PO4, wherein R is selected from the group consisting of C1, C2, C3, C4, C5, C6 alkyl and combinations thereof; and (c) purifying the crude composition by distillation in the presence of the chelating agent to thereby prevent 1230xa decomposition.