Abstract
Conventional p-Xylene separation process is comprised of fractionation to separate ethylbenzene, o-Xylene and crystallization for p-Xylene. It requires multistage crystal separation and no pure m-Xylene is obtainable. To increase the p-Xylene yield, high temperature isomerization is used.Japan Gas Chemical Co.(JGCC) process will be summarized as bollows: m-Xylene is completely separated from the feed mixture by HF-BF3 extraction and resulting raffinate which contains no m-Xylene is fractionally distilled to give ethybenzene, p-Xylene and o-Xylene.Desired quantity of m-Xylene is isomerized by HF-BF3 at low temperature to convert it to o- and p-Xylene with least production of ethylbenzene and other by-products. The first commercial plant of 100, 000T capacity started in Desember 1968 at Mizushima, Japan.
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