苯抽提溶剂劣化对装置的影响及对策

长庆石化公司15万t/年苯抽提装置,采用环丁砜为萃取剂,生产石油苯产品。环丁砜在外界各种因素影响下可能劣化变质,劣化的环丁砜杂质变多、pH值下降、选择性和溶解度变差。通过分析温度、空气、氯离子、水等各因素对环丁砜劣化速度影响,结合溶剂劣化对本装置造成的产品质量下降、设备腐蚀等不良影响的事件,提出了恢复和保持环丁砜性质的相关对策。     

环丁砜-二异丙醇胺复合溶液吸收烟气中CO2实验研究

采用搅拌实验装置,研究环丁砜溶液及不同配比的环丁砜-DIPA复合溶液对烟道气中二氧化碳的吸收和解吸性能,揭示了吸收容量与酸碱度、时间之间的内在联系,并对CO2初始逸出温度、试液再生温度、试液再生率、再生pH下降率进行了细致记录分析.实验结果表明,环丁砜-DIPA复合溶液配比为0.4∶0.6时,吸收效果最佳,吸收量约为0.08 mol,再生温度最低为102.5℃,再生率最高为91.64%.实验结果还表明,环丁砜-DIPA复合体系之间存在弱的正交互作用.     

环丁砜-二异丙醇胺复合溶液吸收烟气中CO_2实验研究

采用搅拌实验装置,研究环丁砜溶液及不同配比的环丁砜-D IPA复合溶液对烟道气中二氧化碳的吸收和解吸性能,揭示了吸收容量与酸碱度、时间之间的内在联系,并对CO2初始逸出温度、试液再生温度、试液再生率、再生pH下降率进行了细致记录分析。实验结果表明,环丁砜-D IPA复合溶液配比为0.4∶0.6时,吸收效果最佳,吸收量约为0.08 mol,再生温度最低为102.5℃,再生率最高为91.64%。实验结果还表明,环丁砜-D IPA复合体系之间存在弱的正交互作用。     

有机胺热稳剂对环丁砜热稳定性的影响

芳烃生产中,抽提剂环丁砜在较高温度会发生劣化导致pH的下降,产生酸性物质,并影响抽提效果,随着劣化程度的加深对抽提设备的腐蚀也越加严重,也会影响芳烃产品的生产效率和质量。为解决这一问题,一般采用加入热稳剂的方法减缓环丁砜的劣化情况,增加芳烃抽提剂环丁砜的使用寿命。本文对环丁砜受热劣化的情况进行了考查,选用了三种不同有机胺化合物及其复配物作为减缓环丁砜劣化程度的热稳剂,利用检测热分解产生的SO₂量来衡量劣化程度和热稳效果。实验结果发现复配热稳剂效果最佳,其中以乙醇胺与不饱和多元胺A的复配比例在2:1,添加量在400mg/L时的热稳效果最好,热稳率超过最好单一热稳剂10%以上。     

环丁砜劣化机理与应对措施研究进展

介绍了近年来国内外对于环丁砜劣化机理的研究情况,以及工业上应对环丁砜劣化所采取的措施。着重介绍了环丁砜热稳定剂的广阔前景,指出目前环丁砜热稳定剂的研究情况和存在的问题,展望了环丁砜热稳定剂的重大应用价值。     

劣质化环丁砜提纯方法探讨

萃取剂环丁砜的纯度对萃取精馏有重要影响,过低的环丁砜纯度不但会影响到产品质量还会造成生产波动使生产不能连续稳定进行。本文提供了一种新的劣质化环丁砜提纯方法,通过在劣质化的环丁砜中加入一定比例蒸馏水进行蒸馏,蒸馏水与环丁砜比例为7:3,控制终馏点温度100～101℃可以得到纯度超过98%的环丁砜。     

关于芳烃抽提溶剂环丁砜保护问题的探讨

叙述了芳烃抽提原理及工艺概况、环丁砜溶剂的特点、环丁砜氧化降解给芳烃生产带来的危害,提出了环丁砜的保护措施。     

环丁砜在石油炼制中的萃取应用研究进展

首先介绍了环丁砜的特点,综述了近几年国内外环丁砜在石油炼制中对饱和烃与芳香烃的萃取及其液液相平衡的研究现状。环丁砜在萃取提取重整油中的苯、甲苯和二甲苯等芳香烃表现出了很好的性能。环丁砜萃取工艺在工业上的应用已经很普遍,但也存在一些问题。因此,需要进一步研发完善环丁砜萃取剂,针对环丁砜在工业萃取方面的应用进行了详细阐述。     

工业环丁砜的纯化

介绍了工业环丁砜的主要物理性质和含有的杂质，详细叙述了纯化工业环丁砜的方法。     

环丁砜生产技术与市场分析

介绍了环丁砜的合成与精制生产工艺技术进展,并通过国内外技术与市场应用分析,指出了环丁砜产品发展方向。     

Competitive adsorption of sulfolane and thiolane on clay materials

Groundwater samples directly beneath a waste disposal site have been shown to contain a higher concentration of sulfolane and a relatively low concentration of thiolane. The sulfolane is a source compound of thiolane, a reduced form of sulfolane. In subsequent analyses of groundwater samples, these compounds have been detected from all of the monitoring wells in the study area. Since these compounds are present together in an aquifer, a possible competition, that can happen in such a system, has been investigated. Thiolane is a nonpolar heterocyclic organic compound whereas sulfolane is a weakly acidic dipolar solvent. As expected, thiolane adsorbs more strongly onto clay than sulfolane in a single solute system. For regression of bisolute system using Matlab to obtain Q (maximum number of moles of solute adsorbed per unit weight of adsorbent), k₁ (constants related to the energy of adsorption for sulfolane), and k₂ (constants related to the energy of adsorption for thiolane), the k₁ value (sulfolane) is smaller than the k₂ value (thiolane) which reflects that thiolane is more strongly adsorbed than sulfolane. This is strongly consistent with the result obtained from single solute system. The Q for the sulfolane and combined data is the same that indicates that the sulfolane data is dominantly fitted because the concentrations of sulfolane are much greater than those of thiolane in the experiments. In combined data regression, the suppression of sulfolane adsorption on clay was also observed by the presence of thiolane.     

UOP660气相色谱法测定水或烃中的环丁砜方法的改进

将ＵＯＰ６６０气相色谱法测定水或烃或环丁砜的方法进行了改进,采用开口管柱代替原方法中的填充柱,色谱操作条件也作了相应的改变。改进的方法与原方法比较具有基线稳定,水的干扰峰不拖尾、水峰和环丁砜的峰完全分开等优点。该新方法准确度高,重复性好,完全能满足生产的需要,具有较大的实用性。     

添加剂对环丁砜热稳定性的影响研究

考察了加热温度和加热时间及添加剂对环丁砜热稳定性的影响,以SO2的释放量作为环丁砜热稳定性的最终评价指标。结果表明,在水气吸收、氮气保护2、30℃加热2 h的实验条件下,添加剂E的使用效果最好,加入量为环丁砜的0.04%时,环丁砜分解产生的硫酸钡沉淀量与SO2释放量最少,释放量为10.99 mg。     

聚苯硫醚树脂纯化工艺研究

用三种高沸点极性非质子溶剂N-甲基吡咯烷酮（NMP）、六甲基磷酰三胺（HMPA）、环丁砜（SL）对自制聚苯硫醚（PPS）树脂进行纯化处理,结果发现环丁砜的纯化效果优于其他两种。运用正交试验对环丁砜纯化PPS树脂的工艺进行优化,得到最佳组合工艺条件为：5g PPS树脂加入11.5ml环丁砜,在160℃纯化4h。结果表明,这种方法可将原粉中灰分含量降到0.17%,能有效降低树脂中无机成分总量。     

环丁砜生产新技术

环丁砜是一种性能优良的有机硫溶剂,广泛用于芳烃抽提、气体净化、萃取蒸馏等方面。文章对国内外环丁砜的生产现状进行了评述,并介绍了新的连续化生产工艺;同时介绍了两种新型环丁烯砜加氢催化剂:Ni/Al-MoS2催化剂和非晶态合金催化剂。新型加氢催化剂既可以有效地解决固体废弃物污染环境的社会问题,也降低了环丁砜生产成本。     

Enhancement of kinetic rates of CO2 in aqueous solutions of piperazine and methyldiethanolamine with addition of sulfolane

Measurements of kinetics rates of CO₂ in aqueous solutions of methyldiethanolamine (MDEA), piperazine (PZ), and mixtures of (MDEA + PZ), (PZ + sulfolane) and (MDEA + sulfolane) were carried out using the stopped flow technique, and reported in terms of pseudo-first-order rate constants (k₀). When possible, the second-order reaction rate constants (k₂) were regressed from the data. Experiments were performed over new concentration ranges of (10–60), (200–800), (200–800, 10–40), (10–40, 10–200), and (200–800, 10–200) mol/m³ for the above-mentioned five systems, respectively, and at temperatures varying from (298.15–313.15 K). When sulfolane was added to the amine solution, pseudo-first-order rate constants in the mixed solvents were higher than in aqueous MDEA and PZ solutions at all temperatures. The kinetic rates were highest at 298.15 K and decreased at higher temperatures for aqueous (MDEA + sulfolane) solutions but increased with temperature for aqueous (PZ + sulfolane) systems. Reaction orders for both PZ and MDEA were practically one at all sulfolane concentrations and temperatures. The base catalysis mechanism was used to regress very well data for aqueous MDEA and (MDEA + sulfolane + water) and the termolecular mechanism was used for (PZ + sulfolane + water) system. Both the zwitterion and termolecular models were able to fit the experimental data for the aqueous PZ system well. Finally, the termolecular and a hybrid model based on the combination of the Zwitterion and base catalysis mechanisms were able to successfully correlate the experimental data for the mixed aqueous (MDEA + PZ) systems.