脱除石脑油中1,2-二氯苯和四氯化碳的研究

发布时间：2018-03-28 05:12

本文选题：分子筛　切入点：吸附　出处：《华东理工大学》2017年硕士论文

【摘要】：近年来,许多炼油厂常常因为石脑油中过量的氯化物造成催化重整装置管路的阻塞和腐蚀。本文采用吸附剂静态吸附法对吸附脱除石脑油中有机氯化物—1,2-二氯苯和四氯乙烷进行研究。测定了吸附剂对1,2-二氯苯和四氯化碳的氯脱除率和平衡吸附量,并通过一系列表征手段对吸附剂进行表征分析,优化了吸附剂的活化条件和吸附过程的吸附条件;同时,通过测定吸附剂对1,2-二氯苯和四氯化碳的吸附等温线并对其进行拟合,计算了相关的热力学参数;又通过动力学模型拟合的方式得到了吸附动力学参数,初步分析了吸附过程的吸附机理。结果表明,在1,2-二氯苯的吸附过程中,分子筛的孔结构影响着分子筛的脱氯性能;金属离子的引入能够极大地提升分子筛的脱氯性能,Cu13X分子筛是吸附1,2-二氯苯的适宜的吸附剂,氯脱除率达到了 87.95%,平衡吸附量为3.88mg/g。Cu13X分子筛吸附1,2-二氯苯的吸附等温线可通过Freundlich等温方程较好的拟合,计算得到了吸附过程的焓变AH=-40.06 kJ/mol,熵变△S=-80.56 J/(mol·K),△G0。拟二级动力学方程可以较好的描述该吸附过程,由拟合结果得到吸附过程的吸附活化能为18.059 kJ/mol。在四氯化碳的吸附过程中,活性炭有较好的吸附效果,但是脱除率也并不高,仅有38%。而活性炭在经过质量分数为20%的硝酸溶液改性之后,对四氯化碳的脱除效果有了比较明显的提高,氯脱除率为60.84%,平衡吸附量是6.13mg/g。同样用Freundlich等温方程和拟二级动力学方程对该吸附过程进行了拟合分析,计算得到了吸附过程的焓变△H=-14.2kJ/mol,熵变AS=-42.68 J/(mol K),△G0,以及吸附反应的活化能为16.114 kJ/mol。
[Abstract]:In recent years, In many refineries, too much chloride in naphtha often causes obstruction and corrosion in the pipeline of catalytic reforming unit. In this paper, adsorbent static adsorption method is used to remove organic chlorides from naphtha from naphtha by desorption of organic chlorobenzene and tetrachloroethylene-2-dichlorobenzene and tetrachloroethylbenzene. Determination of the chlorine removal rate and equilibrium adsorption capacity of the adsorbent for 1h2- dichlorobenzene and carbon tetrachloride, The activation conditions and adsorption conditions of the adsorbent were optimized by a series of characterization methods, and the adsorption isotherms of 1h2- dichlorobenzene and carbon tetrachloride were measured and fitted. The relevant thermodynamic parameters were calculated and the adsorption kinetic parameters were obtained by kinetic model fitting. The adsorption mechanism of the adsorption process was preliminarily analyzed. The results showed that in the adsorption process of 1 ~ (2 +) -dichlorobenzene, The pore structure of molecular sieve affects the dechlorination performance of molecular sieve. The introduction of metal ions can greatly improve the dechlorination performance of molecular sieve. Cu13X molecular sieve is a suitable adsorbent for the adsorption of 1h2- dichlorobenzene. The chlorine removal rate reached 87.95 and the equilibrium adsorption capacity was the adsorption isotherm of 3.88mg/g.Cu13X molecular sieve adsorbing 1h2- dichlorobenzene. The equilibrium adsorption isotherm could be fitted by Freundlich isothermal equation. The enthalpy variation of adsorption process (AH=-40.06 KJ / mol), entropy change (S0 -80.56 J/(mol KN), G0. The pseudo-second-order kinetic equation can well describe the adsorption process, and the adsorption activation energy of adsorption process is 18.059 KJ / mol. in the adsorption process of carbon tetrachloride, the pseudo-second-order kinetic equation can describe the adsorption process well, and the adsorption activation energy of the adsorption process is 18.059 KJ / mol. The activated carbon has a good adsorption effect, but the removal rate is not high, only 38. The removal efficiency of carbon tetrachloride has been obviously improved after the modification of carbon tetrachloride by nitric acid solution of 20% by mass fraction. The chlorine removal rate is 60.84 and the equilibrium adsorption capacity is 6.13 mg / g. The adsorption process is also fitted by Freundlich isothermal equation and pseudo-second-order kinetic equation. The results show that the enthalpy change of the adsorption process H _ (14. 2) KJ / mol, the entropy change of AS=-42.68 J/(mol K ~ (2 +), G _ (0), and the activation energy of the adsorption reaction are 16.114 KJ / mol.
【学位授予单位】：华东理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE626.9;O647.3

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