In different production stages of shale gas fields, various operating conditions and parameters vary widely, and the operating conditions of the triethylene glycol dehydration unit may deviate from the optimal range, which may easily lead to insignificant dehydration effects, which will affect normal production. The HYSYS software was used to simulate the process of a 300.0×10⁴ Nm³/d shale gas triethylene glycol dehydration unit.The influence of the process parameters on the dehydration effect of the triethylene glycol such as the triethylene glycol circulation volume, the mass fraction of the triethylene glycol lean liquid, the flow rate of the feed gas into the tower, and the temperature of the feed gas into the tower,the operating pressure of the absorption tower, the temperature of the lean triethylene glycol liquid entering the tower, the total efficiency of the trays and the number of trays in the absorption tower were quantitatively analyzed.And the reasonable operating range of each process parameter was determined to achieve the best dehydration effect and meet the requirements of dry gas export. The results show that increasing the triethylene glycol circulation, lean liquid mass fraction, absorption tower operating pressure, total tray efficiency and number of absorption trays, as well as reducing the flow and temperature of feed gas into the tower, and the temperature of triethylene glycol lean liquid entering the tower are all helpful to improve the dehydration effect of triethylene glycol; increasing the temperature of the reboiler and the flow of stripping gas are beneficial to increase the mass fraction of the lean triethylene glycol. In addition, the HYSYS simulation calculation results are compared with the on?site production data. The results show that the two are basically consistent, which verifies the accuracy of the simulation calculation results, which can be used to guide actual production. The above research has certain guiding significance for improving dehydration efficiency and reducing investment cost.

As an excellent nucleophile, 1⁃hydroxytryptamine derivatives have been widely used in the synthesis in recent years. With the development of indole alkaloids, 1⁃hydroxytryptamine derivatives will play an important role in the future research. In this paper, 1⁃hydroxytryptamine derivatives were synthesized by tryptamine synthesis method with indole substituted by benzene ring as substrate, protection of nitrogen atom in side chain of tryptamine, reduction of indole ring and oxidation of nitrogen atom in indole ring. Finally, the synthesis of the 1⁃hydroxytryptamine derivative was completed in a medium or higher yield. By this method, we synthesized a series of 1⁃hydroxytryptamine derivatives, and confirmed the accuracy of the structure of the compounds by 1H⁃NMR and 13C⁃NMR.

The aluminum source is made of Al2(SO4)3 solution, and the precipitant is made of NH4HCO3 solution. By modifying the aging step in the preparation process, the structure of the precursor aluminum ammonium carbonate (AACH) and the calcined γ⁃Al2O3 are modulated, and a high specific surface area nano γ⁃Al2O3 with a hierarchical pore structure was prepared. PtSnK/γ⁃Al2O3 long chain alkane dehydrogenation catalyst was prepared with macro⁃mesostructured hierarchical γ⁃Al2O3 as the carrier. C10―C13 long chain alkanes were used as raw materials to evaluate the activity and stability of the catalyst in a small fixed bed reactor. The results of the study indicated that the γ⁃Al2O3 support obtained after secondary modulation had a macro⁃mesostructured hierarchical pore structure, and the pore size distributions of mesopores and macropores were relatively concentrated. The average pore diameter, pore volume, and specific surface area were 25.40 nm, 2.09 cm3/g, and 284.5 m2/g, respectively. The initial conversion of long⁃chain alkanes dehydrogenation over PtSnK/γ⁃Al2O3 catalyst has reached 26.9% under accelerant condition and after 18 hours can still achieve 21.3%, the dehydrogenation conversion rate is higher than that of commercial alumina.

As the main flocculant of flue gas desulfurization wastewater treatment, polyaluminium chloride has the problems of large dosage and high cost in application.By observing the clarity of sewage and determining the concentration of pollutants in sewage, the flocculation effect of polyaluminium chloride, polyacrylamide with different molecular weight and their combination on flue gas desulfurization sewage from catalytic cracking unit is studied by spectrophotometry and chemical titration. The results show that the flocculation of polyaluminium chloride and polyacrylamide was superior to the flocculation of polyacrylamide alone, and the larger the relative molecular mass of polyacrylamide, the better the flocculation effect. At the same time, the effects of flocculant dosage, sewage pH value and stirring time on the flocculation effect were analyzed and optimized. The results showed that 30 mg/L polyaluminium chloride and 1.0 mg/L ultra⁃high molecular weight polyacrylamide were the best flocculation effect on catalytic cracking flue gas desulfurization wastewater at pH 7~8 and stirring time 4~6 minute. The research results also laid a solid foundation for the cost optimization of sewage treatment in the future.

When the gas-liquid two-phase flows through tee pipeline, the distribution of two phase in two branch pipes is always uneven. There may be only gas branch in pipelines when it is serious, while the other export tube may be full of liquid. The numerical simulation on oil-gas two phase fluxion in different time by CFD was made and the oil and gas separation characteristics in branch pipes were get. The results show that there will be gas-liquid separation phenomenon in branch pipe when the oil and gas flow through branch pipe of tee pipeline, and close to the mouth branch the separation phenomenon is obvious. There is almost no separation phenomenon in certain distance of the branch mouth.