Advanced Materials Research Vols. 1004-1005

Abstract: In acid fracturing, the fast acid-rock reaction limits live acid penetration distance. Many kinds of acids were developed to reduce the acid-rock reaction rate. Acid effective consumption time in the fracure is a key factor for accurate prediction of live acid penetraiton distance in acid fracturing designs. In this paper, we developed a new method for measuring acid effective consumption time in the fracture and did experimental result matching to obtain effective acid diffusion coefficient with a acid flow-reaction model. Firstly, we designed a apparatus and corresponding experimental procedure. Then used the new method to measure the effective consumption time for gel acid and crosslinked acid. The new method uses reservoir core samples and is convenient to heat all the fluid as well as pipe lines to the reservoir tempeature, which reflects in-situ conditions more reliably. In the experiment, the rock mass loss with time was measured, based on which the acid consumption time is predicted. Under the experiment conditoins, the gel acid has a effecive consumption time about 17-minute, and the crosslinked acid has about 22-minutes at 130°. Finally, a model of acid flow-reaction in a fracture was used to match experimental results to obtained the acid diffution coeffecient. The results from this study help improve accuracy in acid fracturing designs.

Abstract: A series of Li/MgO/Al₂O₃/FeCrAl monolithic catalyst with different Li contents were prepared by a wetness impregnation method. The effects of Li contents in the catalysts and reaction conditions such as GHSV and CH₄/O₂ on the OCM reaction were investigated. The results show that the conversion of CH₄ and selectivity of C₂ was 38.3% and 27.1%, respectively, which were obtained on the 5%Li/MgO/Al₂O₃/FeCrAl monolithic catalysts at 850 ^oC with a GHSV of 24000 mL·g^-1·h^-1 and CH₄/O₂ of 2.

Abstract: At present, most oilfields in our country has entered the mid-late development, water-flooding technology is widely accepted, multi-layer hybrid mining and multi-layer hybrid conveying process. If no compatibility between injected water and formation water or different horizon produced water is poor, it can form various types of oil field scale.Scale reservoir caused by congestion, not only can bring damage to reservoir, also can give bring different degree of corrosion of equipment and pipeline, reduce the heat transfer rate of equipment and pipeline. The scale formation, fouling hazards, scaling trend prediction and antiscale technology in oilfield produced water are introduced. It as the basis of the theory of compatibility experiments has a certain realistic guiding significance in mixed mining, mixed transportation and reinjection process.

Abstract: The technical solutions integrating the purification systems of normal pressure reaction tank, filtration, refrigeration and water removal, is proposed to trial-produce efficient hydrogen-generating model according to the mechanical structure design of integration and modularization, using efficient chemical hydrogen-generating agent. The practical test shows that the purification purity of hydrogen is up to 99.99%, average rate is over 15slpm, and the system pressure is less than 1.0MPa so that no leakage happens. The system meets the design requirements and indicators and it guarantee the safety usage of hydrogen, which can be used for supplying hydrogen and warming outdoor for its easy operation and convenience.

Abstract: Synthesis and characterization of a novel hexabenzocoronene (HBC) derivative bearing swallow-tailed fluorinated alkoxy chains are described. The six peripheral fluorinated chains, well known for their low van der Waals forces, should result as expected in reduced inter-columnar interactions. The UV−vis absorption spectra of this compound appeared in 230-390 nm region. The thermal properties are waiting for the follow-up study.

Abstract: The ZnO powder was successfully obtained by calcining the basic zinc carbonate, which was synthesized from clinker digestion solution of zinc oxide ore using analytical Na₂CO₃. The factors of mol ratio of Na₂CO₃ to ZnSO₄ and reaction temperature were discussed at stirring intensity 400 rpm. Both the obtained basic zinc carbonate and ZnO powders were characterized using XRD, EDS and SEM. The thermal decomposition of basic zinc carbonate was also investigated below 600°C. The results show that the ZnO powder was wurzite hexagonal structure and the well-crystallized ZnO powder was uniformly spherical particles and distributed in a narrow range.

Abstract: Polystyrene microspheres with 120nm diameter were synthesized by emulsion polymerization and three-dimensionally ordered colloidal crystal templates were obtained by centrifugal sedimentation.Three dimensionally ordered nanopore (3DON) manganese oxide lithium ion-sieve was prepared after filtration, two heated roasting and acid modified by using precursor solution filling the colloidal crystal templates, which was prepared by Lithium salt, manganese salt and citric acid. SEM, XRD, and saturated exchange capacity test were used to characterize the roasting condition, appearance, structure, and ion exchange performance of the oxide. The results showed that, the optimum roasting condition of preparing lithium ion-sieve precursors were found as follows: heating rate at 2°C/min, 300 °C roasting 4h and 800 °C roasting 8h, The 3DON Li₄Mn₅O₁₂ lithium ion sieve precursor has the shape of three-dimensional cross-linked connected into the network structure. Li₄Mn₅O₁₂ was regularly arranged and the hole wall was integrity,average pore size of approximately 90nm.3DON Li4Mn5O12 showed good stability for acid and the retrofit of lithium ion-sieve showed a high selectivity for Li⁺. The saturated exchange capacity of Li⁺ is 51.98mgLi⁺/g.

Abstract: In this paper, the exothermal efficiency and exothermal rate were employed to evaluate and optimize the composition of the self-heating material, and the effects of each component were discussed. The final optimized composition as below: reduced iron powder (20%), potassium permanganate (60%), sodium chloride (10%), activated carbon (10%). Under the optimized conditions, the temperature of this self-heating material could up to 100 °C within 2 min and maintain for 20 min, which should be suitable for flameless fast food self-heating or providing heat source for physiotherapy equipment in the medical field.

Abstract: The stabilizer content of aging combustible cartridge case (CCC) was measured by gas chromatography and chemical method. And the test results under different experimental conditions were analyzed. The results showed that the stabilizer content of the CCC decreased gradually with the aging time increased, which is in line with changes of stability of CCC. It is feasible to determine CCC stability by using gas chromatography.

Abstract: The complexation abilities of 5,11,17,23,29,35-hexacarboxy-37,38,39,40,41,42- hexa-methoxy-hydroxamic calix[6]arene extraction of metal ions (Cu2+, Ni2+, Na+, Fe3+, Cd3+, Mn2+, Pb2+) were studied. And the complexation ration of Cu2+ and Pb2+ were obtained by Job's method. The selective removal of Cu2+ (Pb2+) coexisting with alkali metals ions (Na+, K+) and alkaline earth metal ions (Ca2+, Mg2+), heavy metal ions (Zn2+, Mn2+, Pb2+(Cu2+), Ni2+) and anions (CO32-, C2O42-, SO42-, NO3-) were studied separately . The results revealed that the percent of Cu2+(Pb2+) removal in the presence of alkali metals ions and alkaline earth metal ions was over 83.8% (90%) and in the presence of anions was over 90.1% (81.3%) while the percent of Cu2+(Pb2+) removal in the presence of heavy metal ions was lower than 70.6% (70.0%), and the minimum percent of Cu2+(Pb2+) removal in the presence of heavy metal ions was 32.7% (61.2%).