新型多元复合催化剂液相催化加氢制备1,10-癸二醇

采用共沉淀法、以稀土为助剂制备了Cu-Zn-Fe-La新型多元复合催化剂,并进行了表征;该催化剂不含铬,避免了铬的污染;考察了该催化剂在癸二酸二乙酯催化加氢合成1,10-癸二醇反应中的性能,并对其合成工艺进行了探索。结果表明,在合成1,10-癸二醇中,该复合催化剂的加氢活性达到或者超过目前市场上同类催化剂;优化的加氢工艺条件为:m(催化剂)∶m(癸二酸二乙酯)=0.06,反应温度为220~240℃,反应压力为18~20 MPa;在优化反应条件下,产品收率较高,产品质量较好。该研究为1,10-癸二醇的工业生产提供了技术借鉴。     

茂金属催化剂——双环戊二烯二氯化钛的研究及应用

介绍了茂金属催化剂中双环戊二烯二氯化钛的几种合成方法。并对这些合成方法中的金属钠法、蒽镁法、二乙胺法进行了对比说明。描述了在催化加氢反应过程中的反应机理,介绍了国际国内的市场情况。对双环戊二烯二氯化钛合成技术及催化加氢工艺路线存在的不足和需要完善的地方进行了阐述。     

辛醇合成和醛加氢催化剂研究进展

工业辛醇的主要生产方法有丙烯羰基合成法和乙醛醇醛缩合法,以羰基合成法为主。国内辛醇的生产厂家共有十余家,其中大型企业四家,已全部实现了羰基合成法生产。羰基合成法中,辛烯醛加氢过程十分重要。用于醛加氢的催化剂可归为四类,即铜铬催化剂、铜锌催化剂、镍催化剂和贵金属催化剂,各有其优缺点。液相加氢的反应温度低,因此以加氢活性温度低的镍系催化剂为主;气相加氢则以铜系催化剂为主。国外在醛加氢制醇领域的研究起步较早,国内在此方面的研究还不太多。目前,国内丁辛醇装置上所使用的醛加氢催化剂主要还是依靠进口。加快醛加氢制醇催化剂的开发,将会大大推进制醇工业的发展。     

1,4-丁炔二醇加氢制1,4-丁烯二醇工艺及催化剂研究进展

论述1,4-丁烯二醇发展现状,简述1,4-丁烯二醇BYD加氢法、3,4-环氧-1-丁烯水解法和1,3-丁二烯法3种生产工艺特点.其中,BYD催化加氢法是生产BED技术最为成熟、应用最为广泛的生产工艺.BYD加氢反应是一个多步复杂反应.论述了BYD加氢催化反应过程以及3种催化剂(贵金属催化剂、过渡金属催化剂、骨架型Raney-Ni催化剂)在BYD加氢反应过程中的应用特点,指出Raney-Ni催化剂具有价格低、活性高的优点,开发中压下BYD加氢制备BED的Raney-Ni催化剂具有重要意义.     

γ-丁内酯的催化合成技术进展

评述了γ-丁内酯的催化合成技术进展,重点阐述了1,4-丁二醇催化脱氢法和顺酐催化加氢法及2者耦合等方法催化合成γ-丁内酯催化剂方面的研究成果及合成工艺方面的技术进展,并介绍了广受γ-丁内酯合成企业关注的2种新型合成工艺技术。认为开发高效、高选择性、无毒无害的催化剂及绿色环保的新工艺,将是今后γ-丁内酯合成研究的主要方向。     

硝基苯催化加氢制苯胺的技术概况

介绍了硝基苯加氢制苯胺的技术概况,包括固定床加氢法、液相加氢法和流化床加氢法,对各工艺的优缺点进行了评述,并叙述了硝基苯加氢制苯胺催化剂的发展情况。     

苯甲酸气相加氢合成苯甲醛的催化技术

总结了合成苯甲醛的多种路径,综述了苯甲酸在气相条件下加氢合成苯甲醛催化剂的研究进展,分析了不同种类催化剂(Zr系、Zn系、Ce系)在苯甲酸气相加氢合成苯甲醛反应中的催化性能,从绿色合成工艺和催化剂制备技术等方面提出了今后的研究方向,认为关键是从化学组分优化、催化剂制备技术研究等方面增强无铬催化剂的稳定性,并进一步提高催...     

催化加氢技术在氟化工中的应用

综述了催化加氢技术及加氢催化剂在新型替代品HFOs、HFCs产品的合成、氯氟烃及哈龙类物质的绿色转化、特种含氟单体和特种含氟化学品的合成等领域的重要应用。认为随着环保法规的日益严格,催化加氢绿色技术将在氟化工生产领域扮演越来越重要的角色。     

氢化丁腈橡胶的技术进展

介绍了氢化丁腈橡胶的两种制备方法，即溶液加氢法和乳液加氢法的技术进步。对溶液加氢法中的非均相载体催化技术和均相配位催化技术进行了详细论述，同时预测了ＨＮＢＲ制备技术的发展方向。     

我国草酸酯加氢合成乙二醇专利技术进展

正20世纪80年代以来,随着C1化学化工的发展,草酸酯法合成乙二醇成为研究的热点。草酸酯合成法主要原料为NO、CO、H2和醇类,反应原理是NO与O2反应生成N2O3,再利用醇与N2O3反应生产亚硝酸酯,CO与亚硝酸酯在催化剂作用下氧化偶联得到草酸二甲酯,草酸二甲酯再经过催化加氢制得乙二醇。近年来,我国在草酸酯加氢合成乙二醇技术开发方面取得了长足进展。本文从催化剂、生产工艺、设备以及产品纯化等方面概述了近年来我国草酸酯加氢合成乙二醇专利技术研究进展。     

Morphology of polymer of ethylene sulfide and its block copolymer with styrene

It has been found that poly(ethylene sulfide) obtained by anionic polymerization in tetrahydrofuran assumes the shapes of platelets, microhedrites, microspherulites, or particles of irregular structure, depending upon the molecular weight of poly(ethylene sulfide). In the case of block copolymers of ethylene sulfide and styrene, the morphological form has been found to be dependent upon the composition of the copolymer.     

PET synthesis in the presence of new aluminum catalysts

A new polycondensation catalyst (ethylene glycol aluminum) was synthesized and applied in PET synthesis. It has been characterized by spectral studies (IR, NMR). The catalytic activity of organic aluminum compound was discussed in this paper. In this investigation, the synthesis of poly(ethylene terephthalate) (PET) is presented using ethylene glycol (EG) and terephthalic acid (TPA). The result proved that ethylene glycol aluminum was the real catalytic material. And it was proved to be the most efficient catalyst for the polycondesation reaction among the organic aluminum compounds. Similar catalytic activity has been observed for ethylene glycol aluminum compared to ethylene glycol antimony. The esterification reaction was monitored by measuring the distilled water as a function of time and the modeling of this process was carried out from these data. The received PET samples were characterized by viscometry, carboxyl end-group content and diethylene glycol (DEG) content. A mechanism of aluminum catalysis has been proposed to explain these observations.     

空气预热器在KBR13万t／a乙烯裂解炉上的应用

乙烯生产的能耗,其中80％以上消耗为裂解炉的燃料气消耗,因此裂解炉燃料气消耗成为决定乙烯生产能耗高低的重要因素,裂解炉的节能在乙烯装置生产过程中具有非常重要的意义,兰州石化460kt／a乙烯装置裂解炉增加空气预热器,合理利用资源,达到节能目的。     

Polarity index of surface-active ethylene oxide adducts

The polarity indexes of surface-active ethylene oxide adducts with varying lipophilic parts and varying content of ethylene oxide have been studied. An interesting relationship has been found between the fraction of ether groups and polarity index, which gives a polarity index line for every type of ethylene oxide adduct. It permits the calculation of polarity indexes of all ethylene oxide adducts of known composition with known polarity index of the lipophilic part. It also gives valuable information for evaluating different lipophilic substances as raw materials for ethylene oxide adducts.     

Simultaneous synthesis of dimethyl carbonate and ethylene glycol dimethacrylate using homogenous basic catalyst

A novel method simultaneously to prepare dimethyl carbonate and ethylene glycol dimethacrylate from ethylene carbonate and methyl methacrylate has been demonstrated in the presence of catalyst sodium methoxide and polymerization inhibitor ZJ-705. The effect of reaction parameters such as catalyst loading, polymerization inhibitor loading, concentration of reactants, reaction time, etc., on synthesis of dimethyl carbonate and ethylene glycol dimethacrylate was investigated. A reaction mechanism has been discussed with catalyst sodium methoxide.     

Tensile behaviour of homogeneous ethylene copolymers

The tensile behaviour of homogeneous ethylene–butene copolymer and heterogeneous ethylene–butene copolymer has been compared in uniaxial tension. The homogeneous copolymer exhibits a more marked double yield behaviour. Composition distribution and heat treatment greatly influence the double yield behaviour of ethylene copolymer. A more homogeneous composition distribution has the same effect as rising draw temperature and decreasing draw rate on the double yield behaviour of ethylene copolymers. It is found that the occurrence of the double yield phenomenon is distinguished by the difference between two yield strains. Metallocene‐based ethylene copolymer shows better tensile break properties than conventional ethylene copolymer. © 2002 Society of Chemical Industry     

高效载体催化剂下改性HDPE的合成

研究了TiCl_4/SiO_2—MgCl_2载体高效催化剂作用下的乙烯/己烯共聚,发现共聚合的催化效率高于乙烯均聚,从非均相Ziegler—Natta催化聚合的非稳态扩散动力学观点解释了这一现象。研究了所合成的改性HDPE范围的共聚物样品的热性能和拉伸性能,结果表明其性能与商品牌号样品性能相近。     

降低乙二醇中醛含量的研究

以回归分析方法和模拟工艺参数试验方法所得的数据和结论，探索出乙二醇中醛含量高的影响因素，得出了具有参考价值的操作规律。应用于实际生产中，明显降低乙二醇中醛含量，提高了产品质量。     

Acidity and corrosivity of the volatile distillates in the synthesis of polyethylene terephthalate from dimethyl terephthalate and ethylene glycol

Conclusions The acidity and aggressive properties of volatile distillates in the synthesis of polyethylene terephthalate from ethylene glycol and dimethyl terephthalate have been studied on industrial technological lines. It has been shown that the acidity of the distillates increases as the synthesis process approaches completion. The composition of some of the acidic impurities in the distillates has been identified. It has been shown that the aggressive properties of distillates are determined by their content of strong acids.The effect of the acidity of the original ethylene glycol on the aggressive properties of distillates has been described. It has been shown that the use of neutral ethylene glycol sharply reduces the aggressive properties of the distillates.Measures have been recommended for reducing the aggressive action of distillates and of their distillation products on apparatus and pipelines of nonalloyed steels or cast iron.Translated from Khimicheskie Volokna, No. 2, pp. 12–14, March–April, 1988.     

Kinetics of the melt – Form II phase transition in isotactic random butene-1/ethylene copolymers

The kinetics of formation of the Form II mesophase from the melt has been investigated as a function of the concentration of ethylene chain defects in isotactic random butene-1/ethylene copolymers, using standard and fast scanning chip calorimetry. Presence of ethylene co-units in the butene-1 chain leads to a distinct reduction of the melt – Form II phase transformation rate which has been quantified by evaluation of the critical cooling rate to suppress ordering, and by isothermal analysis of half-times of Form II mesophase formation. For the first time, the temperature-dependence of the rate of Form II mesophase formation has been evaluated for butene-1/ethylene random copolymers and the butene-1 homopolymer. This study needs to be considered as a complementary addendum to former work about the Form II to Form I polymorphic transformation in isotactic random butene-1/ethylene copolymers.