过磷酸钙折流混合器的改进

由于绿原化工有限公司过磷酸钙装置生产能力由 6 70 t/ d(实物量 )提高到 84 0 t/ d,折流混合器负荷增大 ,出现折流环磨损加快等问题。采用若干技改措施 :扩大折流环内径、改变折流混合器喷射方向、采用新材料制作折流环 ,使折流混合器能满足 84 0 t/ d过磷酸钙生产的需要     

用RAP法引上技术生长KCL晶体

用RAP法(reactivo atmosphere process)处理KCl熔体,在不改变生长气氛和RAP继续处理的情况下,提拉生长KCl晶体,以解决高纯、大尺寸、生长速度快、成品率高和有较大经济效益的问题。     

Synthesis of tertiary poly(amido-amine)s with amido- and amino-groups randomly arranged along the macromolecular chain

A new synthesis of poly(amido-amine)s from bis (secondary amine)s and acryloyl chloride has been studied, leading to polymers in which the amido- and amino-groups are randomly arranged along the macromolecular chain. A poly(amido-amine) based on piperazine, chosen as the mother compound, has been fully characterized by ¹³C n.m.r. as well as by identification and quantitative evaluation of its hydrolysis products.     

新型植物杀菌剂--苯并噻二唑类植物抗病诱导剂

植物抗病诱导剂是近年来发现的一种新型植物杀菌剂，苯并噻二唑类(BTH)就是其中重要的一类。对近年来BTH研究情况作一简要综述。     

茂金属乙烯/苯乙烯假无规共聚物(ESI)的研究进展

乙烯／苯乙烯假无规共聚物（ESI）是一类新型的茂金属聚合物，通常苯乙烯质量分数可达80％，随苯乙烯的质量分数增加，ESI由半晶态的弹性体材料过渡到非晶态的热塑性塑料，笔者综述了近年来国外茂金属乙烯－苯乙烯假无规共聚物（ESI）研究与开发的新进展，重点介绍了ESI的物理性能，合成工艺，共混性能，填充性能，膜塑性能及发泡性能，并论述了ESI的应用现状和发展趋势。     

双－（p－N，N－二甲氨基苄叉）酮／二苯基碘鎓盐复合体系的电子转移光显色

不同的双－（ｐ－Ｎ，Ｎ－二甲氨基苄叉）酮ＤＭＢＫ和二苯基碘盐（ＤＰＩＯＦ）复合，组成一种新型的电子转移光显色体系，ＤＭＢＫ／ＤＰＩＯＦ复合体系在暗处有良好的热稳定性。在光作用下很快发生从激发态ＤＭＢＫ至ＤＰＩＯＦ的电子转移，并伴随ＤＭＢＫ染料的褪色，测得ＤＭＢＫ光褪色速度的次序为：ＤＭＢＡ＞ＤＭＢＰ＞ＤＭＢＨ。与此同时，电子转移又引起新的光显色反应，对ＤＭＢＡ化合物，在７００ｎｍ处出现新吸收峰。其光密度随光照时间而增长，然而，ＤＭＢＰ和ＤＭＢＨ体系这种光显色现象并未观察到，这可能由于它们的中间产物不能共平面的缘故，ＤＭＢＡ的光显色速度和最大密度明显取决于浓度和溶剂性质。本文对这种短波区光褪色和长波区光显色的光化学反应过程作了讨论。     

国内外邻苯二甲酸酯类增塑剂的现状和展望

对邻苯二甲酸酯类增塑剂的国内外现状作了评述,并对我国提高DOP和高分子量邻苯二甲酸酯类增塑剂的比例、降低DBP的比例、开发高性能的复合增塑剂提出了积极的建议。     

Selective gas transport in miscible PPO-PS blends

The permeation rates of He, CO₂ and CH₄ though miscible blends of polystyrene and poly(phenylene oxide) at 35°C are reported as a function of pressure. Sorption isotherms for CO₂ and CH₄ are also presented. By using ratios of the permeabilities of the pure gases the separation factors for the gas pairs He---CH₄ and CO₂---CH₄ can be estimated. For both pairs the estimated separation factor goes through a prominent maximum, thus indicating that these blends are more permselective than expected from the behaviour of polystyrene and poly(phenylene oxide). This stems from mobility considerations rather than solubility effects and a qualitative free volume argument is proposed as an explanation. The sorption and transport data have been interpreted and correlated using the dual sorption-mobility models developed previously for glassy polymers. Since the commercial polystyrene used contained a small amount of mineral oil to improve flow behaviour, the effect of this additive on polystyrene properties was explored in some detail.     

聚甲基丙烯酰氧乙基二甲基丁烷基溴化铵共振光散射法测定核酸

通过光谱法研究聚甲基丙烯酰氧乙基二甲基丁烷基溴化铵(PMDB)和核酸的作用。结果表明通过共振光散射法用PMDB检测微量的DNA可靠、准确和简单。     

低位真空冷却装置在磷酸系统中的应用

葛丰化工厂磷酸萃取槽反应热不能有效移出,限制了生产能力的提高,通过采用低位真空冷却装置移走反应热,并同时改造水循环系统。改造后,投矿浆量达16t/h〔矿浆w(H2O)35%〕,生产能力从技改前2.67tP2O5/h提高到4.56tP2O5/h,萃取温度稳定控制在83～85℃。由于结晶状况改善,萃取率、洗涤率分别提高达96.33%、99.04%,能耗从181.3kW·h/tP2O5降低到149.8kW·h/tP2O5,含氟废气排放量从30000m3/h减少到小于6000m3/h。