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N-甲基二胺的生產(chǎn)工藝

目前,我國大型石油化工廠、化肥廠、天然氣凈 化廠須進行脫硫及制硫。N-甲基二胺簡稱 MDEA,是一種新興的脫硫、脫碳溶劑,20世紀70年 代國外已開始在工業(yè)上應用,80年代國內(nèi)相繼完成 了脫硫和脫碳工業(yè)化試驗,90年代后期在工業(yè)上應 用,到本世紀初國內(nèi)已獲得廣泛推廣。MDEA由一 甲胺和環(huán)氧乙烷反應而得。

2.1 合成反應

一甲胺和環(huán)氧乙烷分別計量后,進入混合器混 合,在6.3 MPa和135 ℃條件下反應之后,進行聚合 反應。反應初期,反應需要的熱量由蒸汽直接進入 反應器底部。反應過程中,物料反應產(chǎn)生的大量熱 量會使反應溫度急劇上升,為了維持反應溫度不 變,利用反應器的出口處溫度和反應器內(nèi)的氣相溫 度,對反應器頂部冷卻器的循環(huán)水量進行控制。

2.2 脫胺

反應物進入脫胺塔,大部分未反應的一甲胺從 塔頂部出來,經(jīng)塔頂冷凝器冷卻后循環(huán)使用。脫胺 塔底部的胺液至一次閃蒸塔。

2.3 閃蒸

從脫胺塔出來的反應物在一次閃蒸塔內(nèi),閃蒸 出部分一甲胺,再經(jīng)塔頂冷凝器冷卻后進入二次吸 收塔,從一次閃蒸塔底部出來的液體進入二次閃蒸塔,將未反應的一甲胺閃蒸出來。

2.4 吸收

二次閃蒸塔塔頂出來的氣體,進入一次吸收塔 下部,用初餾塔的一部分輕組分作吸收液進行吸 收。一次吸收塔釜出來的液體進入二次吸收塔作 為吸收液。一次閃蒸塔塔頂出來的氣相經(jīng)冷卻后, 進入二次吸收塔下部,用一次吸收塔底出來的吸收 液進行吸收。二次吸收塔塔頂出來的氣體,進行尾 氣處理排放。

2.5 初餾

從二次閃蒸塔底部出來反應產(chǎn)物,進入初餾塔 中部,塔頂蒸出輕組分胺氣體,再經(jīng)塔頂冷凝器冷 卻后,分兩路,一路送到塔頂部作為初餾塔的塔頂 回流液,另一路送至一次吸收塔作吸收液使用。初 餾所需要的熱量由初餾塔底再沸器用蒸汽加熱來 供給。初餾塔的真空系統(tǒng)由初餾塔的真空泵機組 抽真空。

2.6 精餾

脫去輕組分的反應產(chǎn)物從初餾塔塔底出來,經(jīng) 精餾塔進料泵抽出送至精餾塔中部,通過精餾作用,從塔頂出來的氣體經(jīng)精餾塔頂冷凝器用循環(huán)水 冷卻后,分兩路,一路送至精餾塔頂部作為精餾塔 的回流液,另一路作為裝置的主要產(chǎn)品。精餾所需 的熱量用精餾塔底再沸器用蒸汽加熱供給。從塔 底出來的重組分經(jīng)精餾塔底槽,通過殘液輸送泵送 至殘液受槽。

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