發(fā)布時間：2018-05-07 12:50

  本文選題：碳五分離裝置 + 長周期運行　； 參考：《北京化工大學》2015年碩士論文

【摘要】：中國石化北京燕山分公司新建碳五分離裝置采用中石化自主知識產(chǎn)權(quán)技術(shù)建成,以燕山石化乙烯裝置副產(chǎn)碳五餾份為原料,設計負荷15萬噸/年,主要產(chǎn)品為異戊二烯、間戊二烯和雙環(huán)戊二烯。利用好碳五資源是降低乙烯成本的重要措施之一,也為燕山石化異戊橡膠裝置提供原料,支持了燕山石化核心業(yè)務的發(fā)展,改善了燕山石化的產(chǎn)品結(jié)構(gòu)。本文針對燕山石化碳五分離裝置在建成后首次運行期間出現(xiàn)的問題,主要包括系統(tǒng)聚合嚴重,第二萃取塔運行周期短,溶劑二甲基甲酰胺(DMF)水解嚴重,異戊二烯損失偏高等影響裝置長周期運行的問題,闡明了原因并進行了機理分析,進而提出了相應的解決方法,并對改造后再次運行的情況進行了分析。在保證產(chǎn)品質(zhì)量、收率的前提下,首要延緩異戊二烯的聚合速率,降低脫重塔(C102塔)以及萃取系統(tǒng)的聚合程度；其次隨著裝置運行時間的延長,裝置內(nèi)聚合物難免會增加,因此也要保證裝置在較長時間的運行后依然能穩(wěn)定運行;最后還要維持循環(huán)溶劑DMF的品質(zhì),降低水解程度和排放損失,以保證循環(huán)溶劑系統(tǒng)穩(wěn)定運行。針對上述問題逐一改進之后,碳五分離裝置在第二次運行期間產(chǎn)品質(zhì)量均達標,能耗最低為218.7千克標油/噸原料,低于設計值226.8千克標油/噸原料。萃取系統(tǒng)聚合程度明顯減輕,使異戊二烯收率達到84%,較首次開車大幅提高14個百分點,但低于90%的設計值；間戊二烯收率達到92%,超過設計值3個百分點：雙環(huán)戊二烯收率達到87%,超過設計值1個百分點。循環(huán)溶劑(DMF)品質(zhì)得到改善,溶劑中水含量在500mg/kg以內(nèi)。總之,本次技改達到了預期目的,確保了裝置長周期穩(wěn)定運行。
[Abstract]:The newly built carbon 5 separation unit in Beijing Yanshan Branch of Sinopec was built using Sinopec's independent intellectual property technology. The by-product of Yanshan Ethylene Plant was used as raw material and the design load was 150000 tons / year. The main product was isoprene. M-pentadiene and dicyclopentadiene. Making good use of C _ 5 resources is one of the important measures to reduce ethylene cost, and also provides raw materials for Yanshan Petrochemical isoprene rubber plant, which supports the development of Yanshan Petrochemical's core business and improves the product structure of Yanshan Petrochemical. In this paper, the problems occurred during the first operation of the C _ 5 separation unit in Yanshan Petrochemical Company were discussed, including serious system polymerization, short operation period of the second extraction column and severe hydrolysis of solvent dimethylformamide (DMF). The problems affecting the long period operation of the plant such as high loss of isoprene are explained, the cause and mechanism are analyzed, and the corresponding solutions are put forward, and the reoperation after revamping is analyzed. On the premise of ensuring the product quality and yield, the polymerization rate of isoprene is mainly delayed, the polymerization degree of the extraction system is reduced and the polymerization degree of the descaling tower C102) is reduced. Secondly, with the increase of the operating time of the unit, the polymer in the unit will inevitably increase. Therefore, it is necessary to ensure that the unit can still operate stably after a long period of operation. Finally, it is necessary to maintain the quality of the circulating solvent DMF and reduce the degree of hydrolysis and emission loss in order to ensure the stable operation of the circulating solvent system. After improving one by one of the above problems, the product quality of the carbon-5 separation unit is up to standard in the second operation period, and the lowest energy consumption is 218.7 kg / ton feedstock, which is lower than the design value of 226.8 kg / ton feedstock. The degree of polymerization in the extraction system was obviously reduced, and the yield of isoprene reached 84%, which was 14 percentage points higher than that of the first start-up, but less than 90% of the design value. The yield of m-pentadiene was 92%, which exceeded the design value by 3%. The yield of dicyclopentadiene reached 87% and exceeded the design value by 1%. The quality of circulating solvent (DMF) was improved and the water content in the solvent was within 500mg/kg. In a word, this technical reform has achieved the expected purpose and ensured the long-period stable operation of the device.
【學位授予單位】：北京化工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TQ221.22

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本文編號：1856989