مولوی محمد شفیع
افسوس ہے کہ گذشتہ مہینہ پاکستان کے نامور فاضل مولوی محمد شفیع صاحب سابق پرنسپل اورینٹل کالج لاہور نے انتقال کیا، ان کی وفات علمی دنیا کا بڑا حادثہ ہے، وہ ہندو پاک کے نامور فضلاء و محققین میں تھے، انگریزی کے ساتھ عربی و فارسی کے بھی ماہر تھے، ان کا علمی پایہ بہت بلند تھا، ان کے علمی و تحقیقی کارنامے بڑے متنوع ہیں، بہت سے فاضلانہ علمی مقالات کے علاوہ انھوں نے عربی و فارسی کی متعدد اہم اور نادر کتابوں کو تصحیح و تحشیہ کے ساتھ مرتب کرکے شائع کیا، اپنی پرنسپلی کے زمانہ میں علمی حیثیت سے اورینٹل کالج میگزین کا معیار بہت بلند اور اپنے تلامذہ میں سنجیدہ علمی تلاش و تحقیق کا ایک عام ذوق پیدا کردیا تھا، چنانچہ لاہور کے موجودہ فضلاء اور محققین میں بیشتر انہی کے تربیت یافتہ ہیں، ادھر چند سال سے لاہور یونیورسٹی اردو انسائیکلوپیڈیا کی تالیف و اشاعت کا کام ان کی نگرانی میں شروع ہوا تھا، اور اس کے بعض اجزا شائع بھی ہوئے لیکن ابھی یہ کام ابتدائی منزل میں ہے، اس قحط الرجال کے زمانہ میں علمی ذوق و طلب میں ان کی ذات علمائے سلف کا نمونہ تھی اﷲ تعالیٰ اس شیدائے علم کو رحمت و مغفرت سے سرفراز فرمائے۔ (شاہ معین الدین ندوی، اپریل ۱۹۶۳ء)
Purpose of the study was to reflect great contributions of Dar ul Uloom Deouband. After the end of Independence War 1857, three factors endangered the Muslims of India religiously and educationally. Firstly, the Christian missionaries who thought that after the political downfall Muslims would convert themselves to Christianity. Secondly, the missionaries were proclaiming blasphemy about Islam and the Holy Prophet Muhammad Sallalaho Alaha Wasalam. In this regard, William Mure wrote a notorious blasphemous book about which Sir Syed said, “Alas! We like to die.” Thirdly, in these circumstances the doubts of Muslims were increasing that Muslim may not be converted to Christianity but it may create hatred from Islamic ideology. Just to cope up with these dangers, various educational movements came into being; one of them is Deouband Movement. As a result of the efforts by Dar ul Uloom Deouband, Muslims were able to save their Din and eman.
Fossil fuels are a major contributor to the today’s world energy demand as well as greenhouse gases causing global warming. The idea to reduce the dependence on fossil fuels for a green future needs a stepwise transition from fossil fuels to renewable sources. Among the various renewable sources hydrogen is probably the most promising alternative due to its availability, high heating value per unit weight, and zero emissions. The only challenge associated with hydrogen is its safe and feasible storage. The methylcyclohexane-toluene-hydrogen (MTH) system is the one that is considered safe and economical option for hydrogen production, storage and transportation, and utilization. The dehydrogenation reaction of the MTH system is highly endothermic and requires considerable amount of heat energy at a fast rate to have high equilibrium conversions. The successful utilization of hydrogen economy based on the MTH system therefore requires a highly active, selective, and stable dehydrogenation catalyst with its associated reaction kinetics. An intensified dehydrogenation reactor design that supplies high rates of heat transfer to the catalyst bed is also desired. A comprehensive review of the literature regarding kinetics of the methylcyclohexane (MCH) dehydrogenation over Pt containing catalysts has revealed that there is no consensus among the researchers on describing the reaction mechanism, rate-determining step, and inhibition offered by a product. Different researchers have suggested different reaction chemistry and developed different kinetic rate equation. There is hardly a study on the design and simulation of an intensified dehydrogenation reactor that is capable of being used on commercial scale applications. In the present study, an attempt is made to address the discrepancies in the kinetics of the MCH dehydrogenation that exist in the literature. The experimental data of 5 different Pt containing catalysts over a wide range of operating conditions is used to conduct a detailed kinetic study of the dehydrogenation reaction. Various kinetic models are developed based on the power law, Langmuir-Hinshelwood-Hougen-Watson (LHHW), and Horiuti-Polanyi reaction mechanism. The developed kinetic model equations are analyzed both kinetically and statistically and the best fitted kinetic model for each of the catalysts is worked out. The kinetic model based on single-site LHHW kinetics where loss of first hydrogen is the rate limiting step is found appropriate in representing the data of all the catalysts. This leads to report a unified kinetic model for the methylcyclohexane dehydrogenation reaction over any Pt containing catalyst. In addition to that, a new reaction mechanism called associative adsorption of methylcyclohexane is proposed and a kinetic model equation developed based on this mechanism is found successful in representing the relevant experimental data. A 2.0 MW power plant, working on the methylcyclohexane dehydrogenation reaction to yield hydrogen gas as fuel for the power production, is proposed and simulated in Aspen Hysys. The operating conditions such as stream flowrates, temperatures, pressures, and thermal efficiency are worked out. It is found that 17.4148 kmol/h methylcyclohexane are required to produce 2.0 MW net power output. Also, it is found that there is enough energy in the exhaust gases of the turbine that can carry out the dehydrogenation reaction. Using the best-fit kinetic model and the simulation data obtained for 2.0 MW power plant, a novel reactor-heat exchanger design is mathematically modeled and simulated. The proposed reactor configuration is found highly appropriate in carrying out the dehydrogenation reaction.