C级以上F4绝缘套环

技术类型：新材料项目简介：该产品采用先进独特的工艺方法，使F4环具有定量的热收缩率、张力，并使其表面具有可粘性，并配套提供高强耐高温粘接剂。目前具体应用场合——静电水处理装置中绝缘套；高速列车及地铁列车的系列电机上；多种压缩机、泵等封闭密封套环等。该产品在国内生产历史较短，尚在不断完善之中，绝大部分尚需进口，国内生产厂家有3家，并具有出口创汇的能力。     

氟乙烷(C2H5F,EtF)制备研究进展

本文着重介绍了氟乙烷的各种制备方法,对各种工艺进行了比较,以期从中选出适合于工业生产的工艺方法;文中也对氟乙烷的各种性质和用途进行了简单的介绍.     

Unraveling the cooperative effects of acid sites and kinetics for pyrolysis of CHF3 to C2F4 and C3F6 on SO42−/ZrO2-SiO2

The treatment or upgrading of waste trifluoromethane (CHF₃, R23), which has a significant greenhouse effect, is of great importance in industry. Herein, series of SO₄²⁻/ZrO₂-SiO₂ catalysts with different Brønsted and Lewis acid site densities and ratios were prepared for pyrolysis of R23 to tetrafluoroethylene (C₂F₄, TFE) and hexafluoropropylene (C₃F₆, HFP). The effects of impregnation concentration of (NH₄)₂SO₄ on specific surface area, crystal phase, and Brønsted and Lewis acid site densities and ratios were respectively demonstrated. The Brønsted and Lewis acid sites were observed to have cooperative effects on R23 transformation and up to 94.6% selectivity of (TFE + HFP) could be achieved at 750°C. The kinetic studies revealed the decomposition of R23 into CF₂ carbene and HF was the rate-determining step, and a deactivation behavior was found due to the site coverage and pore blockage by the oligomers of TFE and HFP.     

加热炉(F1101,F1102, 1203,F1501)

(一)概述(1)石脑油过热炉(F1101)作予脱硫石脑油加热用,即石脑油+弛放气混合经 E1101 A,B,C,D 四组热交换器后,使温度达310℃,进入加热炉使其过热到380℃送第一Co—Mo 加氢反应     

C20B4和C20B2N2的量子化学研究

用Hartree-Fock（HF）方法优化了C24及其异质富勒烯C20B4和C20B2N2几何构型,分析了C20B4和C20B2N2的相对稳定性与前线轨道性质。结果表明,B原子和N原子的取代使C24的稳定性降低,前线轨道能级升高,这对它的氧化还原活性产生了影响。     

In situ ESR of CrH-ZSM-5 up to 500°C in flowing gas containing O2, H2O,CCl4, NO,NO2, and C3H6

A flow cell was used for the in situ ESR monitoring of the state and reactivity of chromium ions in Cr-ZSM-5. Calcination of Cr(NO₃)₃/NH₄-ZSM-5 in air at 500°C is accompanied by migration of chromium ions inside the zeolitic channels and stabilization ofisolated Cr⁵⁺ cations near lattice A1³⁺ ions. Calcination of Cr-ZSM-5 at 750°C leads to a gradual disappearance of the isolated Cr⁵⁺ cations and formation of -Cr₂O₃ microcrystals. All the Cr⁵⁺ cations are accessible to gas-phase molecules: O₂ strongly broadens the dipole-dipole signal; H₂O sorption increases the local crystal field symmetry; admission of CCl₄ results in a small change of the Cr⁵⁺ local coordination; strongly stabilized complexes on Cr-ZSM-5 are observed upon sorption of either NO or NO₂. The sorption of C₂H₆ on Cr-ZSM-5 at 20°C is accompanied by a gradual reduction of the Cr⁵⁺ sites. At 500°C in [C₃H₆ + O₂ + He] flow, even at a large excess of oxidant, the reduction of a noticeable part of Cr⁵⁺ ions takes place. At 400°C, in the same gas mixtures, a deeper reduction of Cr⁵⁺ occurs. Closer to stoichiometric conditions, in a [C₃H₆ + NO + He] flow with 120% excess of oxidant the Cr⁵⁺ is completely reduced at 500°C. The oxidation of propene is accompanied by coke deposition on the surface of the catalyst. The implications of the results are discussed.     

乙烯联产混合C4,C5烃的利用

本文主要介绍了国内外对乙烯联产混合Ｃ４、Ｃ５烃的利用。并由此转化为高值化产品，降低乙烯生产成本，提高经济效益     

煤化工C4生产2-丙基庚醇

简要介绍了2-丙基庚醇(2-PH)生产技术及生产工艺,2-PH的市场需求和应用前景。2-PH装置作为对煤化工副产混合碳四的综合利用装置,分析其技术经济性,并对项目建设提出建议。     

试析C4钢N2O4冷凝器腐蚀原因

试析Ｃ４钢Ｎ＿２Ｏ＿４冷凝器腐蚀原因宋尔应（淮南化工总厂安徽省淮南市２３２０３８）我厂于１９９０年８月将浓硝酸生产设备Ｎ２Ｏ４冷凝器的材质由高纯铝更新为Ｃ４钢（００Ｃｒ１４Ｎｉ１４Ｓｉ４），结构如图１所示。该设备运行到１９９２年７月１日，在浓硝酸停车...     

CaC2O4—H2C2O4—H2O体系相平衡研究

测量了25 C时CaC_2O_4-H_2C_2O_4-H_2O三元系的固液平衡数据,实验数据用Pitzer模型进行了关联。     

C1-C2醇合成C4醛醇的研究进展

C_4醛、醇包括异丁醛、异丁醇以及正丁醇等在工业上具有广泛的应用,如异丁醛可以制备异丁醇、新戊二醇、甲基丙烯酸、异丁酸等许多下游产品;正丁醇可用于制备邻苯二甲酸以及磷酸的正丁酯类增塑剂,广泛用于各种塑料和橡胶制品。本文综述了近年低碳醇(C_1-C_2醇)合成的C_4醛、醇的研究进展,并且对催化剂的収展进行了展望。     

[（C2H5）N4]2{FeS4[S2CN（C2H5）2]4}的晶体和分子结构

本文报导含类立方烷型簇核Ｆｅ４Ｓ４的金硫配位化合物「（Ｃ２Ｈ５）４Ｎ２「Ｆｅ４Ｓ４」Ｓ２ＣＮ（Ｃ２Ｈ５）２」４」的合成,晶体和分子结构测定的结果。     

CH4+C2H4气体混合物的水合物相平衡

实验考察了CH_4 C_2H_4 THF 水混合体系在一定温度(276.15～282.15K)、压力(2.0～3.0MPa)和THF水溶液浓度(THF摩尔分数60％～12.0％)范围内的气体-水合物相平衡情况。结果表明:富水相中THF的加入大大地阻碍了水合物孔穴中C_2H_4的进入,使得乙烯在气、固两相中的分配发生了逆转,乙烯在气相中被提浓,而无THF存在时乙烯则是在水合物相中得到富集。     

TiO_2对制备Al_4SiC_4-Al_4O_4C复合材料的作用

将焦宝石粉、活性炭粉和铝粉按质量比39:27.6:33.4配料作为基料,再分别加入占基料总质量0、3%、6%和9%的TiO2粉末(锐钛矿型),加入<10%的酚醛树脂为结合剂混匀后,压制成型,坯体试样干燥后,置于刚玉管式炉中,通入流动氩气,分别于1 300、1 400、1 500、1 600和1 700℃保温2 h制备了Al4SiC4-Al4O4C复合材料.利用热重分析、化学分析、XRD和SEM等测试技术,研究了TiO2加入量对材料物相组成和显微结构的影响.结果表明:试样中的Ti在烧成过程中有少量损失,残余的TiO2在1 300 ℃前全部反应转变为TiC,生成的TiC在1 300～1 700 ℃稳定存在;Tio2加入量对材料物相组成没有明显影响,但TiO2加入量超过3%时,Al4SiC4和Al4O4C的生成温度将由1 500℃提升至1 600℃;随着材料中Ti4+浓度增加,Ti4+更容易与Al4SiC4形成有限置换固溶体而导致晶格缺陷,促使Al4SiC4在1 700℃分解,形成更多的Al4O4C短纤维,同时使试样表面生成片状Al2O3层.     

(SiC,TiB2)/B4C复合材料的微观结构及性能

以B4C与Si3N4和少量SiC,TiC为原料,Al2O3和Y2O3为烧结助剂,烧结温度为1 800～1 880℃,压力为30 MPa的热压条件下制备(SiC,TiB2)/B4C复合材料.用透射电子显微镜、扫描电子显微镜和能谱分析进行显微结构分析.结果表明:在烧结过程中反应生成了SiC,TiB2和少量的BN.复合材料的主晶相之间有长棒状架构弥散相和束状弥散相,在部分B4C晶粒内部出现了内晶结构.结合对复合材料性能的分析表明:新形成相、均匀细晶和棒状结构对提高材料的性能具有重要作用.通过对材料断口形貌和裂纹扩展模式分析认为,复合材料的断裂机制主要为裂纹偏转.     

(NH4)2C2O4·H2O和NH4HC2O4·0.5H2O 单晶的培养研究

利用六次甲基四胺缓慢水解产生的NH3和草酸反应,扩散法培养出(NH4)2C2O4·H2O和NH4HC2O4·0.5H2O两种单晶.     

Enhanced Production of C2–C4 Olefins Directly from Synthesis Gas

An attempt made for the selective production of C₂–C₄ olefins directly from the synthesis gas (CO + H₂) has led to the development of a dual catalyst system having a Fischer–Tropsch (K/Fe–Cu/AlOx) catalyst and cracking (H-ZSM-5) catalyst operate in consecutive dual reactors. The flow rate (space velocity) and H₂/CO molar ratio of the feed have been optimized for achieving higher CO conversions and olefin selectivities. The selectivity to C₂–C₄ olefins is further enhanced by optimizing the reaction temperature in the second reactor (cracking), where the product exhibited 51% selectivity to C₂–C₄ hydrocarbons rich in olefins (77%) with a stable time-on-stream performance in a studied period of 100 h.