煤基石脑油半再生催化重整制芳烃的工艺

摘要

采用工业铂铼双金属重整催化剂 Pt-Re/γ-Al2O3开展了煤基石脑油半再生固定床催化重整单因素实验,并采用响应面法对工艺参数进行了优化与分析,最后对优化工艺条件下实验产物进行了分析.结果表明:加权平均入口温度(WAIT)、压力(P)、液时空速(LHSV)等操作条件对煤基石脑油芳烃型半再生重整产品质量、芳烃收率和C5+液体收率有很大的影响.煤基石脑油重整合适工艺参数区间:WA I T(500~520℃)、P(1.2~1.6MPa)和LHSV(2.0~3.0h–1);最佳工艺条件:WAIT为516℃,P为1.4MPa,LHSV为2.3h–1.优化工艺条件下芳烃收率达到了79.81%,响应面实验操作条件区间内,WAIT、P和LHSV对芳烃收率影响大小顺序为:P>LHSV>WAIT.相比于石油基石脑油重整,煤基石脑油重整不仅纯氢产率和氢气纯度更高,还可获得更高的苯-甲苯-二甲苯(BTX)产率,其中苯收率:甲苯收率:二甲苯收率近似为1:3:2.%The experimental studies of single factor on the semi regenerative catalytic reforming of coal derived naphtha has been made in an adiabatic fixed bed device using new industrial platinum rhenium reforming catalyst(Pt-Re/γ-Al2O3). The process parameters were optimized and analyzed by response surface methodology. Finally,experimental product analyses at optimized process conditions were made.The results show that WA I T(weighted average inlet temperature),P(reaction pressure), and LHSV(liquid hourly space velocity)had a strong influence on the product quality,aromatic yield, and C5+liquid yield of the aromatic type semi regeneration catalytic reforming of coal derived naphtha. The appropriate process parameters intervals were:WAIT 500—520℃,P 1.2—1.6MPa,LHSV 2.0—3.0h–1.The optimal process conditions were determined as follows:WAIT at 516℃,P at 1.4MPa,LHSV at 2.3h–1. Under the optimized process conditions,the yield of aromatics reached 79.81%. In the operating condition intervals of response surface experiments,the order of magnitude of WA I T,P and LHSV on the yield of aromatics was:P>LHSV>WAIT. Compared to petroleum derived naphtha reforming,coal derived naphtha reforming can obtain higher pure hydrogen yield,hydrogen purity,and BTX (benzene-toluene-xylene) yield. The ratios of benzene yield to toluene yield and to xylene yield are approximately 1/3 and 1/2,respectively.