A novel phosphorus-containing epoxy with high heat resistance and low hydroxyl was synthesized from naphthoquinone,DOPO,phenolic epoxy and isocyanate.The glass transition temperature Tg and dielectric properties of the resin were measured by differential scanning calorimetry(DSC)and plate capacitance method,respectively.The results showed that the glass transition tempera-ture Tg was higher than 170℃,the dielectric constant and dielectric loss were lower,DK<3.50,Df<0.01,water absorption<0.2%,and the flame retardant was V0.When it was used as copper clad laminate base resin material,it had low dielectric,low dielectric loss,high Tg,low water absorption,V0 flame retardant and other excellent comprehensive properties.
The research progress of metal impurity removal for lithium iron phosphate cathodes were systematically summarized in this paper,the development trend of deep metal impurity removal technology were also put forward via briefly instruction of the principles,advantages and disadvantages of various metal impurity removal methods.Among them,solvent extraction method had some disadvantages such as high production cost in spite of simple operation.Pre-positioned acid pickling method was fit for dealing with the lithium iron phosphate materials containing trace impurities,had the advantages such as simple process,deep impurity removal and so on.However,pre-positioned acid pickling method also had the disadvantages of low selectivity and poor recovery.Dissolution inhibition method was applied for those lithium iron phosphate materials with high impurities,had the drawback of poor impurity removal.The complexation/precipitation method overcomed the shortcomings of dissolution inhibition method and had the advantages of easy control and sufficient impurity removal,indicated the prospect of industrial application.
随着聚烯烃产业的迅速发展,针对新型结构聚烯烃的研究也越来越深入.通过技术创新,采用专有聚合技术制备的长链支化线性低密度聚乙烯产品,各项性能优异,拓展了聚乙烯材料在发泡、高透膜、涂覆等高端领域的应用,同时可满足塑料轻量化和环保可回收等要求.这是国内首次在工业化聚乙烯装置上研发长链支化线性低密度聚乙烯产品,可为聚烯烃的结构调整与性能升级提供思路.
The particle size of CeO2 had a great impact on product performance.The effects of different precipitators,ammonium bi-carbonate concentration,feeding speed,reaction temperature,aging time,stirring speed and calcination temperature on the preparation and particle size of large-particle cerium dioxide were studied.The results showed that when the concentration of ammonium bicarbonate was 2.5mol/L,the droplet acceleration of ammonium bicarbonate was 1mL/min,the reaction temperature was 60℃,the aging time was 20h,the stirring speed was 80r/min,the calcination temperature was 950℃and the calcination time was 1.5h,the large particle CeO2 with D50 of 53.472µm were prepared.This method was simple and suitable for the preparation of other large-particle rare earth oxides.
At present,foam drainage technology was an economical and effective technology to solve the problem of liquid accumulation in gas wells,and foam drainage agent was the most critical part of foam drainage technology.The commonly used foaming agents in gas fields were introduced,the synthesis formulas,application conditions,effectiveness,advantages and disadvantages of conventional and applied foaming agents were discussed in detail.The current research progress on the application of silica particles in foaming agents,as well as the mechanism and advantages and disadvantages of their combination with various types of foaming agents,were reviewed.The problems in the preparation and application of foaming agents were analyzed,and the development trend and prospects of foaming agents in future foaming processes were proposed.
催化裂化是目前石油炼化及二次加工过程中的重要环节,在生产过程中,进料中的部分硫、氮等元素转变为硫氧化物、氮氧化物,部分催化剂磨损、热崩失活后转变为颗粒物粉尘.上述3类污染物随催化裂化再生烟气一起进入尾气处理单元(烟气脱硫、烟气脱硝、PTU),经酸碱中和实现脱硫,在一氧化碳焚烧炉内的高温条件下,氨气和一氧化氮反应实现脱硝,PTU单元通过加入助剂和空气等方法降低污水COD值.本文着重探讨了催化裂化装置停工过程中,在一氧化碳焚烧炉未停运状态下各项环保指标的控制.
本文对市场上的通用无规共聚聚丙烯产品指标进行分析,结合下游客户的实际应用需求,确定了无规共聚聚丙烯3240R的关键性能指标,进行生产工艺调整和助剂配方优化后,在某公司60万t·a-1聚丙烯装置上成功生产了无规共聚聚丙烯3240R产品.测试了产品的基本物理性能,产品的熔体流动速率为13.8～15.4g·(10min)-1,冲击强度大于5.5kJ·m-2,弯曲模量大于900MPa,雾度可控制在13%以内,负荷变形温度大于85℃,各项性能均达到指标要求.产品具有很好的透明性和韧性,特别是韧性明显优于同类产品,其他性能可满足制品加工的要求.
7-deazapurine was a heterocyclic aromatic compound composed of pyrimidine and pyrrole,which was the pharmacophore of anti-tumor,anti-virus,anti-inflammatory and immunosuppressive drug and so on.In this research,7-deazapurine derivatives were synthesized through five steps.All compounds were characterized by NMR and HRMS.The antimicrobial activity of new derivatives was evaluated.
Reactive brilliant red was widely used in the printing and dyeing industry,and the generated printing and dyeing wastewater had the characteristics of high chromaticity and COD.In this paper,magnetic biochar was prepared from discarded eggshells,and its adsorption effect on active brilliant red was studied.The single factor experimental results showed that the removal effect of magnetic egg shells on reactive brilliant red increased with the increase of dosage,oscillation time,and oscillation rate,while decreased with the increase of temperature,pH,and initial concentration of reactive brilliant red.The orthogonal experimental results showed that when the optimal adsorption conditions were as followed:the dosage of magnetic eggshell was 2.4g,the adsorption temperature was 25℃,the adsorption time was 80min,the oscillation rate was 160r/min,and the pH was 6.At this time,the magnetic eggshell had the highest removal rate of 99.25%for 10mg/L reactive brilliant red simulated printing and dyeing wastewater.The order of importance of experimental influencing factors was initial concentration,pH,and magnetic eggshell dosage.The adsorption was more consistent with the quasi second order kinetic model and the Fredudlich adsorption model,indicating that the adsorption process was mainly chemical adsorption,which was single-layer adsorption.This study demonstrated that eggshell was a potential adsorption material.
Applied Bi(NO3)3·5H2O and Na2WO4·5H2O as raw materials,flower shaped Bi2WO6 photocatalysts were prepared by hydrothermal method.XRD and SEM were used to characterize the crystal structure and micro morphology of samples.Applied ciprofloxacin as the target pollutant,the photocatalytic degradation efficiency of photocatalysts on pollutants was studied.Illuminate with visible light for 2 h,the degradation efficiency of ciprofloxacin by catalyst sample BWO-12 was 84.2%.The obtained photocatalyst had good application prospects in medical wastewater treatment.
本文简要介绍了某石化公司的Unipol聚丙烯工艺流程,分析了氧气对生产过程及产品质量的影响,采取相应的解决措施后,减少了从各环节进入生产工艺系统的氧气量,降低了氧气对装置生产及产品质量的影响.
LiLSX oxygen production molecular sieve was currently recognized as the best performing pressure swing adsorption(PSA)material for separating air for oxygen production.Due to the large-scale application of lithium-ion batteries in the fields of electric vehicles and energy storage,the prices of lithium-related chemical products had rapidly skyrocketed,and LiLSX molecular sieve materials had become very expensive.This was prompted people to continue exploring ways to improve the performance of molecular sieves for PSA oxygen production and reduce costs.In the cell of LiLSX molecular sieve,N2(and O2)molecules could only interact with cations at position 3(SIII/III'),while adsorption with metal ions at other positions was difficult.Based on this discovery,researchers were tried to modify LiLSX molecular sieve by replacing the metal lithium ions at positions 1(SI/SI')and 2(SII/SII')with other ions,in order to reduce the content of metal lithium ions and prepare a large number of modified molecular sieve materials.However,based on the overall cost and performance,a better oxygen production molecular sieve material than LiLSX was still not been developed.
A large amount of oily sludge were generated in the exploitation,transportation and refining of natural gas and oil,which had complex composition,high emulsification and strong stability,so it was difficult to achieve effective reduction treatment only by single mechanical separation.In order to minimize the ecological risk of high emulsified oily sludge,a green and efficient quenching and tempering and demulsification process was urgently needed.In this paper,an efficient oxidation-ultrasonic combined conditioning and demulsification(O-UCCD)process was proposed,and the effects of conditioning and demulsification were evaluated by sludge specific resistance and liquid holdup.At the same time,a variety of microscopic characterization methods were used to monitor the stability of the emulsion.The experimental results showed that the treatment effect of O-UCCD method was better than that of single oxidation or ultrasonic treatment.After treatment,the sludge specific resistance was reduced from 130.30×1012 m/kg to 2.77×1012 m/kg,and the liquid holdup of filtered sludge was reduced from 89.23%to 68.71%,which was much lower than the national quality standard(80%)for oily sludge reduction treatment,and also lower than most reported results.From the detection results of micro-morphology of the oily sludge emulsion,three-phase contact angle,oil-water interfacial tension,emulsion droplet size and Zeta potential,it was known that the stable structure of the modified emulsion was destroyed,and the droplets agglomerated and led to instability.
The impeller was the core part of a high-speed pump,the flow rate,head,efficiency,and anti cavitation performance of the high-speed pump were all closely related to the structural design of the impeller.The Influence factors of blade fracture caused by insufficient mechanical strength of impeller blades were analyzed in this study.Orthogonal experiments were carried out according to experiment statistic data of rotating speed,inlet width and blade thickness.Effect law and trends of rotating speed,inlet width and blade thickness on mechanical strength of impeller were illustrated.Study results indicated that rotating speed was the most important factor affecting the mechanical strength,and followed by the inlet width,influence of blade thickness was the least.The study results also indicated that impeller equivalent stress increased with the increases of rotating speed and blade thickness,and decreased with the increases of inlet width.
Traditional composite materials in today's society were difficult to meet the application needs,and people had started to focus on biomimetic functional gradient structure composites.Researchers had found that many biomaterials had obvious cross-scale,hierarchical complex gradient structures with high strength and toughness,which brought important inspiration for the artificial preparation of new biomimetic functional gradient materials.This paper reviewed the complex gradient structure and performance characteristics of biomaterials,and then summarized the research progress in the preparation of bionic functional gradient structure composites using powder metallurgy,3D printing technology and freeze casting method,focused on the relationship between structure and performance of bionic functional gradient structure composites and looked forward to their development.
Applied medical material Poloxamer 127(Poloxamer F127)as a raw material,the near-infrared dye IR780 as a functional molecule,N,N'-carbonyldiimidazole molecule was used to activate the terminal hydroxyl group of the poloxamer molecule in a mild environment protected by nitrogen.The amination reaction of ethylenediamine with activated poloxamer was carried out.The water-soluble near-infrared new material was prepared by the substitution reaction of active chlorine and aminohydrogen in IR780 structure,and its structure was characterized by infrared spectroscopy and hydrogen spectroscopy.The performance test found that the maximum absorption wavelength of the aqueous solution of the structural substance was 624 nm,and the blue shifted 110nm compared with IR780,also confirmed the molecular structure of the poloxamer-IR780.
In the oil and gas field,hytpaulic fracturing was the most effective method to increase the recovery of oil wells.Polymers played an important role in the fracturing process as one of the additives in fracturing fluids.In this paper,the drag reduction mechanism of polymers as drag reducing agents in water-based fracturing fluids was reviewed,the drag reduction structures was analyzed,their viscosity increasing mechanism was discussed,the viscosity increasing mechanism of polymeric polyacrylamide cross-linked metals and the improvement and application of polymers as proppant coatings to the performance of fracturing systems were described.The challenges faced by polymers in fracturing fluids and future perspectives were discussed.
赤峰某化工厂年产1万t三羟甲基丙烷项目,废水产生量为336 m3·d-1,为高COD、高甲醛废水.为了降低废水毒性对后续生化处理系统的影响,采用"中和调节+UASB厌氧反应器+沉淀池"工艺,对三羟甲基丙烷废水进行预处理.处理后,废水的COD浓度从原水的8000mg·L-1降低至3200mg·L-1,甲醛浓度从2000mg·L-1降低至300mg·L-1,表明采用此工艺处理废水,两类污染物的去除率分别达到60%和85%.同时,对各构筑物的运行参数和运行效果做了详细分析.
在四甲基氢氧化铵碱胶的催化作用下,不同比例的八甲基环四硅氧烷和环氧双封头发生反应,生成不同分子量的端环氧基硅油.本文考察了反应温度、时间、催化剂加入量、环氧双封头加入量及脱低时间等因素对端环氧基硅油的影响,并确定了最佳的反应条件.
