7月TDI市场报告

正一、市场行情简述本月行情:7月,国内TDI市场报盘行情上行。月初,受7月高挂牌影响,持货商坚挺报价,然市场需求寡淡,持货商存出货压力,报盘相对平稳。月中,受巴斯夫高结算消息支撑,持货商挺市意向明显,报盘向上引导市场,然传统淡季,下游抵触情绪明显,场内货源充足,挺市不易,多数交投僵持。月末,TDI工厂8月挂牌结算出台,高结算超出预期,工厂挺市心态明显,持货商心态消极,报盘调涨,场内低价货源逐渐消失,然下游抵触高价,多有价无市,实质性交投寥寥。下游需求跟进不足,预计TDI市     

7月纯MDI市场报告

正一、市场行情简述本月行情:本月纯MDI市场弱势向下,月初开盘,万华公布结算及挂牌,但下游对于万华挂牌结算反馈平平,按需采购,采购意向一般,持货商心态不稳,积极出货,随后,淡季需求明显萎缩,需求利空依旧延续,贸易商减仓避险,让利走货,中旬,夏季高温来临,受到限电等影响,下游生产积极性不高,且场内利好难寻,商谈重心小幅下挫,临近月末,随着万华公布本月挂牌与结算,与上月持稳,超过市场预期,下游反馈平平,成交重心持续低     

一种氢溴酸普拉格雷醋酸化合物及其制法

正本发明涉及一种氢溴酸普拉格雷醋酸化合物的合成方法。以普拉格雷为中间体,将普拉格雷和水混合搅拌,得悬浊液,然后与氢溴酸和醋酸反应,加入有机溶剂,析出固体,干燥,即得,或者,以氢溴酸普拉格雷为中间体,将氢溴酸普拉格雷和水混合搅拌,得悬浊液,然后和醋酸反应,加入有机溶剂,析出固体,干燥,即得。本发明采用水作为溶剂,更加环保,节能,而且本发明步骤简单,得到的产物纯度高,生产成本低,可工业化生产。公开号:CN103450219A     

张云龙篆隶作品赏析

晚清以来碑学大兴,大篆名家辈出,吴昌硕结体长方,左低右高,取斜势,陶博吾书自石鼓,自得天成,放逸随意,破石鼓文之匀雅,变而奇崛峭拔。大篆取向多样,吸引着学人为之研究,近人罗振玉、丁辅之、董作宾诸人均在此处取得了可贵的成就,张云龙先生所书的大篆有独到之处,《石鼓文》之外,兼擅《散氏盘》、《毛公鼎》、琅邪刻石等,于秦砖汉瓦自有天机处,别开新境。大篆是以形为上,云龙先生取钟鼎之浑圆,玉筋之婉通,或取诏版之方折,不拘泥于原形勾画。其大篆的线条自成一相,方圆错落有致,章法布白高妙,静中有动,动中有静,字距参差有致,行距疏宕有韵,别具生机。     

优化结构有序建设积极促进橡胶工业全面协调和可持续发展

改革开放以来,我国橡胶工业的发展速度是前所未有的,其间有许多成功的经验,特别是入世后,在上世纪末全行业整体亏损的不利情况下,大家认识一致,认真对待,风雨同舟,趋利避害,经受住了考验,不仅行业经济全面复苏,而且取得新的发展。当前,全行业面对的是新一轮的竞争,而且更为激烈     

硫酸氢钠催化合成乙酸乙酯的工艺研究

以硫酸氢钠为催化剂,乙酸与乙醇为原料合成了乙酸乙酯,讨论了酸醇物质的量比、催化剂用量、反应时间、带水剂等因素对酯化率的影响,确定了最佳工艺条件为:以0.2mol乙醇为基准,酸醇物质的量比为1.5∶1,催化剂用量为1.5g,反应时间为2h,带水剂环己烷为10mL,乙酸乙酯的酯化率为85.2%.该催化剂具有催化效果好,使用量少,酯化率高,能够重复使用,环境污染小,腐蚀性小,价格低廉易得等特点,是一种很有发展前景的催化剂.     

SINOSTEEL LUOYANG INSTITUTE OF REFRACTORIES RESEARCH CO.,LTD.

<正>Sinosteel Luoyang Institute of Refractories Research Co.,Ltd.(LIRR)is a science and technology enterprise affiliated to Sinosteel Corporation,China.LIRR,established in 1963,is the only large integrated research institute and the center of technology,science,information and services in refractories industry.Its business scope covers refractory products,testing equipment,processing tools,project design,consultation and turnkey,domestic and foreign trade,products quality inspection,information service,etc.     

半隐于郊 艺术之调

柳林小径深处,一扇木门掩映的白色建筑,即是王功新林天苗夫妇在宋庄的别墅。从大门进来,前方是白色的月亮门,像一道影壁墙,遮蔽外人的视线,经过一片水竹摇曳的甬道,才入院子。院内,三层小楼房顶上两层主体分别向两侧挑空,蜿蜒的池塘从花园延伸至室内,隔着一面大大的落地玻璃墙,恍惚间分不清哪里是室内,哪里是室外。更不可思议的是,池塘中间竟然是空的,下面就是那个巨大的工作室,鱼儿游过,涟漪荡漾开来,总担心这水会不会溢出……     

6月AA市场报告

<正>一、市场行情简述本月行情:本月AA市场窄幅整理,月初,海力公布挂牌,受到上游原料纯苯强势走势影响,上调500元/吨,对外执行11,500元/吨,贸易商心态得到提振,纷纷上调报盘,刺激下游接货,但端午节后归市下游惯性观望,交投有限,中旬时期,随着下游进入传统行业淡季,需求明显萎缩,贸易商报盘坚挺,但实则成交重心暗降,随着明稳暗降操作,场内低价货源陆续增多,下游采购谨慎,临近月末,上游原料纯苯挂牌上调300元/吨,强势震荡影响市场操作积极性,海力又公布了6月结算价格,对外执行11,500元/吨,提振持货商心态,但实盘成交寥寥,下游需求跟进滞缓。上游原料:     

硫磺供需现状与市场分析(上)

硫磺别名硫、胶体硫、硫黄块,外观为淡黄色脆性结晶或粉末,有特殊臭味.分子量为32.06,蒸汽压是0.13 kPa,闪点为207℃,熔点为119℃,沸点为444.6℃,比重、熔点及其在二硫化碳中的溶解度均因晶体不同而异,工业硫磺呈黄色或淡黄色,有块状、粉状、粒状或片状等.块状硫磺为淡黄色块状结晶体,粉末为淡黄色粉末,能溶于二硫化碳、四氯化碳和苯,不溶于水.     

The Effects of Operating Parameters on Nitrogen Isotopes Separation by Displacement Band Chromatography

Abstract

The separation of nitrogen isotopes by displacement band chromatography was studied under various operating conditions, using columns packed with sulfonated polystyrene-divinyl benzene, cation exchange resins. Average resin size was varied from 10 to 113 μm, operating temperature from 23 to 70°C, displacing solution concentration from 0.3 to 0.9 N, and superficial velocity from 1.0 to 2.0 cm/min. The maximum separative power for nitrogen isotopes was directly proportional to stage velocity (band velocity/height equivalent to a theoretical stage). The effects of operating parameters on the separative power were therefore evaluated in terms of stage velocity. The results indicate that operating temperature and resin particle size have greater effects on the maximum separative power than do displacing solution concentration and flow rate.     

On a Formula to Evaluate the Separative Power of Long Gas Centrifuges

We discuss the possibility of applying the semi-empirical formula derived for evaluating the separative power of the Russian-type optimized gas centrifuge, with a rotor length about 1 m, to centrifugal machines of arbitrary length. It is demonstrated that the formula can adequately describe the dependence of a single gas centrifuge's performance on rotor peripheral rotation, length, and diameter for machines with lengths of up to 5 m. The comparison of the calculated values for separative power, obtained by numerical simulations of flow and diffusion in gas centrifuges with that of the URENCO machines, demonstrates satisfactory agreement.     

The Separative Bioreactor: A Continuous Separation Process for the Simultaneous Production and Direct Capture of Organic Acids

Abstract

The replacement of petrochemicals with biobased chemicals requires efficient bioprocesses, biocatalysis, and product recovery. Biocatalysis (e.g., enzyme conversion and fermentation) offers an attractive alternative to chemical processing because biocatalysts utilize renewable feedstocks under benign reaction conditions. One class of chemical products that could be produced in large volumes by biocatalysis is organic acids. However, biocatalytic reactions to produce organic acids typically result in only dilute concentrations of the product because of product inhibition and acidification that drives the reaction pH outside of the optimal range for the biocatalyst. Buffering or neutralization results in formation of the acid salt rather than the acid, which requires further processing to recover the free acid product.

To address these barriers to biocatalytic organic acid production, we developed the “separative bioreactor” based on resin wafer electrodeionization, which is an electrodeionization platform that uses resin wafers fabricated from ion exchange resins. The separative bioreactor simultaneously separates the organic acid from the biocatalyst as it is produced, thus it avoids product inhibition enhancing reaction rates. In addition, the separative bioreactor recovers the product in its acid form to avoid neutralization. The instantaneous separation of acid upon formation in the separative bioreactor is one of the first truly one‐step systems for producing organic acids.

The separative bioreactor was demonstrated with two systems. In the first demonstration, the enzyme glucose fructose oxidoreductase (GFOR) was immobilized in the reactor and later regenerated in situ. GFOR produced gluconic acid (in its acid form) continuously for 7 days with production rates up to 1000 mg/L/hr at >99% product recovery and GFOR reactivity >30 mg gluconic acid/mg GFOR/hour. In the second demonstration, the E. coli strain CSM1 produced lactic acid for up to 24 hours with a productivity of >200 mg/L/hr and almost 100% product recovery.     

Analysis of Feed Effects on a Single-Stage Gas Centrifuge Cascade

Abstract

The Onsager pancake model for the fluid dynamics of the countercurrent flow of gas in a centrifuge is used to study the separation performance of a single-stage gas centrifuge cascade. Based on the fluid dynamic solutions, Cohen-Onsager theory is used to calculate the separative performance. The separation considered is the enrichment of natural ²³⁵U to 3%. The effects of the introduction of the feed gas on the separation performance are studied, and this work is compared to similar work by Rätz who used a much simpler model. The present work agrees well with the simpler model on predictions of separative performance but not on parameters such as the axial location of the feed stream.     

Batch separations with tails recycle

This study develops material balance calculation techniques for repetitive batch separation processes in which the tails stream is collected in fractions which are recycled to the next batch at appropriate intervals. Criteria for selecting the fraction sizes which minimize total separative work per unit of products are determined. In the electrolytic rectification of a D₂O-H₂O mixture from 20 to 99.8% D₂O at a separation factor of 11, for example, three fractions thus selected are adequate and the separative work is considerably less than that of the more conventional cascade system.     

Optimal operation of simulated-moving-bed reactors for nonlinear adsorption isotherms and equilibrium reactions

An explicit design procedure for simulated-moving-bed reactors (SMBRs) is presented, incorporating a nonlinear, competitive isotherm, and an equilibrium reaction involving three species, e.g., A⇔B+C. This design procedure is based on an equilibrium theory model of a true-moving-bed (TMB) reactor and it is in close analogy to the well-known design procedure for purely separative SMB-units, the so-called ‘triangle theory’ (Journal of Chromatography A, 769, 3 (1997)). It allows an easy determination of the optimal point of operation and can also evaluate the robustness of an operation point. The operating region of full conversion and complete separation for the TMBR is compared to the one of a purely separative TMB unit, to which only the products are fed. The underlying explicit relations for the new design procedure are presented and their reliability is validated by comparison with experimental data of a SMBR for the synthesis of methyl acetate.     

基于热质传递解耦特性的溶液除湿过程传热传质系数(Ⅱ)实验与Le-hD分离测量法应用

对采用规整波纹填料结构的溶液除湿器除湿过程进行了实验研究,空气与溶液流型组织形式为叉流,基于Le-hD分离测量法得到空气入口流量、温度、含湿量以及溶液入口质量分数、温度对耦合传质系数的影响,并采用数据回归的方法对传质系数与Lewis数进行拟合,得到该类结构除湿器除湿过程的传质系数与Lewis数的关联式,并进行了74组稳态实验对该关联式进行误差分析与验证,结果表明根据关联式计算得到的进出口参数变化与实验进出口参数变化之间相对误差很小,进出口空气温度变化、含湿量变化误差分别仅在6%、10%以内,进出口溶液温度变化相对误差不超过12%,表明Le-hD分离测量法的准确性和可接受性。     

基于热质传递解耦特性的溶液除湿过程传热传质系数(Ⅱ)实验与Le-hD分离测量法应用

对采用规整波纹填料结构的溶液除湿器除湿过程进行了实验研究,空气与溶液流型组织形式为叉流,基于Le-h_D分离测量法得到空气入口流量、温度、含湿量以及溶液入口质量分数、温度对耦合传质系数的影响,并采用数据回归的方法对传质系数与Lewis数进行拟合,得到该类结构除湿器除湿过程的传质系数与Lewis数的关联式,并进行了74组稳态实验对该关联式进行误差分析与验证,结果表明根据关联式计算得到的进出口参数变化与实验进出口参数变化之间相对误差很小,进出口空气温度变化、含湿量变化误差分别仅在6％、10％以内,进出口溶液温度变化相对误差不超过12％,表明Le-h_D分离测量法的准确性和可接受性。     

天然香料提取分离技术研究进展

简单介绍了我国天然香料分布情况及其应用领域。综述了高速逆流色谱分离（HSCCC）、超声萃取、超临界二氧化碳、生物催化、分子蒸馏、树脂吸附等技术应用于天然香料提取分离的原理、特点以及在天然香料提取方面的应用。最后对天然香料的提取技术进行展望并提出今后天然香料的发展趋势。