一種回收順酐的工藝方法。該方法是以正丁醇與含有順酐生成氣進行酯化反應(yīng)生成單酯，再將單酯分解成正丁醇和順酐。該工藝的特征在于設(shè)置一個熱分解反應(yīng)精餾塔，它以酯化反應(yīng)生成的單酯和一定含量的二酯為原料，在相應(yīng)的工況下在塔內(nèi)進行反應(yīng)蒸餾，塔頂產(chǎn)出正丁醇回酯化反應(yīng)塔循環(huán)使用，塔底產(chǎn)出順酐和二酯去精品精餾塔進行順酐精制。具有吸收快、吸收收率高、不腐蝕設(shè)備、無三廢、、操作可靠特點。
A process method for recovering maleic anhydride. In this method, n-butanol is esterified with the gas containing maleic anhydride to produce monoester, and then the monoester is decomposed into n-butanol and maleic anhydride. The characteristic of the process is to set up a thermal decomposition reaction distillation column, which takes monoester and certain content of diester produced by esterification reaction as raw materials, carries out reactive distillation in the tower under corresponding working conditions, n-butanol is produced from the top of the tower, and the esterification reaction tower is recycled, and maleic anhydride and diester are produced at the bottom of the tower for maleic anhydride refining in the fine distillation column. It has the characteristics of fast absorption, high absorption yield, no corrosion of equipment, no three wastes, energy saving and reliable operation.
正丁醇在室溫無催化劑條件下，與含有順酐反應(yīng)生成氣反應(yīng)生成單酯（ＭＢＭ），再將單酯加熱反應(yīng)，生成正丁醇和順酐的工藝路線回收順酐的新工藝，它由酯化反應(yīng)吸收塔１，正丁醇予處理塔２和冷凝器５，冷卻器６，及精品精餾塔４和冷卻器８所構(gòu)成，其特征在于，設(shè)置一個熱分解反應(yīng)精餾塔３及塔頂冷凝器７。
N-butanol reacts with maleic anhydride to produce monoester (MBM) under the condition of no catalyst at room temperature, and then the monoester is heated to produce n-butanol and maleic anhydride. The new process for recovering maleic anhydride is composed of esterification reaction absorption tower 1, n-butanol pretreatment tower 2, condenser 5, cooler 6, fine distillation column 4 and cooler 8 A thermal decomposition reaction distillation column 3 and a tower top condenser 7 are arranged.
該塔以酯化反應(yīng)吸收塔塔底產(chǎn)出的單酯和一定量的二酯為原料，在進料溫度為５０℃－１２０℃，塔頂真空度為３００－７５０ｍｍＨｇ，回流比為１－３的工況下實行熱分解反應(yīng)精餾，塔頂產(chǎn)出純正丁醇經(jīng)冷凝器７送回酯化反應(yīng)吸收塔１循環(huán)使用，塔底產(chǎn)出順酐與二酯送精品精餾塔４進行順酐精制。
Under the conditions of feed temperature of 50 ℃ - 120 ℃, vacuum degree of 300-750mmhg and reflux ratio of 1-3, pure butanol from the top of the column is sent back to esterification absorption tower 1 for recycling through condenser 7, and maleic anhydride is produced at the bottom of the tower It is sent to refined maleic anhydride with diester in fine distillation column 4.Maleic anhydride was refined
