正丁烷氧化法顺丁烯二酸酐生产工艺尾气的循环利用

为回收利用尾气中的未反应原料并减少环境污染，中国石油吐哈油田公司石油天然气化工厂对２万ｔ／ａ正丁烷氧化法顺丁烯二酸酐生产装置进行了尾气循环利用技术改造。计算结果表明，装置的尾气极限循环率为４５．２％，首次技术改造后只实现了１５．０％的循环利用，潜力尚较大。１５．０％尾气循环利用后，正丁烷单耗［ｍ（正丁烷）／ｍ（顺丁烯二酸酐）］由１．１７０ｔ／ｔ下降到１．１４５ｔ／ｔ，正丁烷节约量为３３５ｔ／ａ。

Tail gas recycling technology of n -butane oxidation to maleic anhydride

In order to recycle the unreacted n -bu- tane in tail gas and to reduce environmental pollution, the tail gas recycling revamping was conducted in the 20 kt/a n- butane oxidation to maleic anhydride unit of Petroleum ＆ Natural Gas Chemical Plant in Turpan Hami Oilfield Company, PetroChina. The calculation showed that the limit recycling percent of tail gas in the unit was 45.2% ,while only 15% tail gas was recy- cled in this revamping;there was more tail gas to be left for recycling. After this revamping, the unit con- sumption of n - butane [m（n - butane ）/m （ maleic anhydride） ] decreased from 1. 170 t/t to 1. 145 t/ t, saving n -butane 335 t/a.