石油石化节能与减排
石油石化節能與減排
석유석화절능여감배
2014年
6期
14-18
,共5页
PTA%稀醋酸%萃取技术%共沸剂%理论板数%相比%节能减排
PTA%稀醋痠%萃取技術%共沸劑%理論闆數%相比%節能減排
PTA%희작산%췌취기술%공비제%이론판수%상비%절능감배
PTA%dilute acetic acid%extraction technology%entrainer%number of the theoretical plate%phase ratio%energy-saving and emission-reduction
针对 PTA 生产过程中产生的稀醋酸，提出采用共沸剂作为萃取剂进行萃取，萃取相进入原有脱水塔，而萃余相进入共沸剂回收塔。利用 Aspen 模拟和实验研究的方法得到了适宜的理论板数和相比，并根据该体系为低界面张力和需要高理论板数的特点，选用筛板萃取塔作为萃取装置。工业应用结果表明，与原有过程相比，能耗降低约25%，醋酸从常压吸收塔气相的排放量也相应降低。
針對 PTA 生產過程中產生的稀醋痠，提齣採用共沸劑作為萃取劑進行萃取，萃取相進入原有脫水塔，而萃餘相進入共沸劑迴收塔。利用 Aspen 模擬和實驗研究的方法得到瞭適宜的理論闆數和相比，併根據該體繫為低界麵張力和需要高理論闆數的特點，選用篩闆萃取塔作為萃取裝置。工業應用結果錶明，與原有過程相比，能耗降低約25%，醋痠從常壓吸收塔氣相的排放量也相應降低。
침대 PTA 생산과정중산생적희작산，제출채용공비제작위췌취제진행췌취，췌취상진입원유탈수탑，이췌여상진입공비제회수탑。이용 Aspen 모의화실험연구적방법득도료괄의적이론판수화상비，병근거해체계위저계면장력화수요고이론판수적특점，선용사판췌취탑작위췌취장치。공업응용결과표명，여원유과정상비，능모강저약25%，작산종상압흡수탑기상적배방량야상응강저。
In this paper a new technology which uses the entrainer (n-propyl acetate) as extractant to extract dilute acetic acid stream coming from the production of PTA is put forward. The extract phase is sent to the existing solvent dehydration column while the rafifnate phase is introduced to the solvent recovery column to recover the entrainer. The appropriate number of theoretical plates and phase ratio of the extraction column are obtained by simulation and experiment. The sieve plate extraction column is chosen due to the low interfacial tension of the system and high theoretical plate number. Industrial application results show that, compared with the existing processes, the new technology can reduce energy consumption by about 25% and decrease the vapor emissions of acetic acid from the atmospheric absorber accordingly.
