富氧分离膜

由于膜分离过程是一种省能型操作,近年来,气体分离膜的研究受到关注。本文论述了用于从空气中富集氧气的均聚和嵌段共聚物膜、等离子体聚合膜、人工双分子膜、聚合物/液晶复合膜、促进输送膜等的结构与选择透过分离性能之间的关系,以及它们的用途与发展趋势。     

2,7-二甲基-2,4,6-辛三烯-1,8-二醛合成方法概述

2,7-二甲基-2,4,6-辛三烯-1,8-二醛(简称"十碳双醛",简写:C10)为合成类胡萝卜素的关键中间体。对十碳双醛的结构和用途做了简要介绍;对现有专利、文献报道的十碳双醛的合成路线做了全面综述,指出各合成工艺中存在的优缺点,对工艺中需要改进的地方作了简单的说明;提出十碳双醛今后的研究方向,为十碳双醛及类胡萝卜素系列产品的合成提供了重要的参考意义。     

季戊四醇的研制与应用

季戊四醇是具有广泛用途的化工原料。介绍了单季戊四醇、双季戊四醇的研制原理和方法，特别介绍了由单季戊四醇研制双季戊四醇的方法，阐述了双季戊四醇的应用前景。     

过氧化物交联剂和烯丙基系列助交联剂

系统介绍了有机过氧化物交联剂如无臭味交联剂双BP、叔丁基过氧化氢和二叔丁基过氧化物以及烯丙基类助交联剂三烯丙基三聚氰酸酯、三烯丙基异三聚氰酸酯、三羟甲基丙烷三甲基丙烯酸酯和聚三烯丙基异三聚氰酸酯的结构、性质 (包括活性氧量和分解特性 )、用途和合成方法。     

双丙酮醇的制备

本文论述了双丙酮醇的性质、用途及其生产工艺和操作。     

轴手性酰基硫脲催化合成吡唑啉酮衍生物

吡唑啉酮环化合物因具有生物药理活性等多种特性和用途,被认为是极具价值的结构基元之一,吡唑环上易形成氢键等特性使得药物分子中的吡唑啉酮结构能够发挥生理活性.合成了多种以3,3'-二羧酸-1,1'-联萘酚为手性骨架、结构上下对称的新型多活性中心C2轴手性氢键型双酰基硫脲催化剂,将其用于催化合成吡唑啉酮衍生物.实验结果表明:...     

乙撑双硬脂酸酰胺(EBS)的用途与开发

介绍了乙撑双酰胺(EBS)的概念、国内外市场情况、性质、用途,泸天化技术中心对EBS研究的成果。     

塑料行业的新型润滑剂乙撑双硬脂酸酰胺(EBS)的开发研究

介绍了乙撑双酰胺(EBS)的概念、国内外市场情况、性质、用途,公司技术中心对EBS的研究开发。     

乙撑双硬脂酸酰胺的合成及应用

主要介绍了乙撑双硬脂酸酰胺的合成工艺、反应条件、影响因素以及产品的一些用途。     

一类含4,5-二氢噻唑醇酸酯的3,4-二氯异噻唑衍生物及其制备方法和用途

正本发明提供了一类含4,5-二氢噻唑醇酸酯的3,4-二氯异噻唑衍生物及其制备方法和用途。本发明涉及含1,2,3-噻二唑的杂环化合物,它们具有如VI所示的化学结构通式。本发明公开了上述化合物的结构通式、合成方法与用作杀虫剂、杀螨剂、杀菌剂的用途,其与农业上可接受的助剂或增效剂混合用于制备杀虫剂、杀     

对真空喷淋水系统进行杀菌灭藻的实验

分析聚酯生产中真空波动的原因 ,介绍了向真空喷淋水系统循环冷却水中投入杀菌灭藻剂来改善真空能力的实验     

PET/PTT共混体系的非等温结晶动力学研究

采用DSC方法研究了PET/PTT共混体系的非等温结晶动力学,研究发现:PET/PTT共混体系各样品的结晶峰温度和半结晶时间t1/2随着冷却速率的提高而下降;结晶动力学常数Zc随着冷却速率的提高而增加,表明共混体系的结晶速率随着冷却速率的提高而增大;Zc随着PTT含量的增加而逐渐减小,在其含量达40%￣50%时出现了最小值。     

高温辊式破碎机的辊轴冷却计算分析

在熟料冷却工艺中,辊式破碎机中置方案具有更佳的冷却效果,可有效提升热回收效率,同时对辊式破碎机的机械要求也更高,需对辊轴进行强制冷却。对高温辊式破碎机的辊轴冷却进行建模,并利用计算机编程求解非线性方程组,计算分析冷却换热模型,为辊轴的结构设计参数及冷却风机选型提供了理论依据。     

纳尔科水处理技术在循环水冷却系统的应用

介绍了中国石油大庆石化分公司水气厂第一循环水冷却系统,通过采用纳尔科公司的A.Z.Lite水处理方案、HSP高效分散技术及Trasar技术,使循环水浓缩倍数从3倍提高到5倍以上,从而实现了较好的节水效益。     

双曲线冷却塔在煤化工装置中的应用

600kt／a甲醇装置循环冷却水系统选用的双曲线冷却塔采用自然通风,无需动力通风设备,具有冷却效果稳定、能耗低、故障少、易维护、操作人员劳动强度轻、作业环境好等优点。双曲线冷却塔投运后,运行状况良好,节约了大量的电能和水资源,具有明显的经济效益和社会效益。     

Temperature and crystallinity profiles generated in a polycaprolactone/starch blend under different cooling conditions

This work concerns the numerical simulation of the temperature profiles and the degree of crystallinity through the thickness of a part made from a commercial biodegradable material based on caprolactone and starch (Mater‐Bi Z), as a function of the cooling conditions from the melt. The crystallization kinetics during cooling conditions was evaluated experimentally by calorimetry and the Kamal–Chu equation was used to describe the degree of crystallinity developed during constant cooling rate experiments. This equation coupled with the thermal energy equation, through a heat source term, described the heat generated during crystallization of the polymer. The numerical solution of the system of differential equations was obtained using an implicit finite‐difference method. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 3275–3283, 2001     

Programmed cooling crystallization of potassium sulphate solutions

The crystal size distribution from a batch cooling crystallizer is predicted by the numerical solution of a mathematical model which uses empirical kinetics of nucleation and crystal growth. The predictions clearly point out the potential advantages of controlled cooling at a constant nucleation rate for improving the product crystal size over that obtained by either natural or linear cooling.Experimental runs following programmed cooling curves for seeded potassium sulphate solutions showed reasonable agreement with the theoretical predictions. A size dispersion of the crystals was observed which contributes to a slight deviation from theory. Nevertheless, controlled cooling significantly reduced the quantity of nuclei formed and improved the product crystal size distribution.     

焦炉煤气中氨的回收

焦炉荒煤气经初冷后,少部分氨存在于剩余氨水中,大部分的氨仍留在煤气中,这2部分的氨都应加以回收。介绍了初冷煤气中氨以及剩余氨水中氨的各种回收工艺以及其优缺点,并对各种工艺的使用情况作了简单叙述。     

Crystallization kinetics modeling of high density and linear low density polyethylene resins

This paper describes isothermal and nonisothermal crystallization kinetics of a Ziegler‐Natta catalyzed high density polyethylene (HDPE) and linear low density polyethylene (LLDPE) resins. Standard techniques such as differential scanning calorimetry (DSC) and light depolarization microscopy (LDM) techniques were used to measure isothermal kinetics at low supercoolings. DSC was also used to measure nonisothermal crystallization kinetics at low cooling rates. Extrapolation of isothermal crystallization half‐times of Z‐N catalyzed LLDPE resin using the isothermal half‐time analysis led to erroneous predictions, possibly due to Z‐N LLDPE consisting of a mixture of molecules having different amounts of short chain branching (comonomer). However, predicted reciprocal half‐times at high supercoolings, using isothermal half‐time analysis and using nonlinear regression of nonisothermal crystallization kinetics measured at low cooling rates using the differential Nakamura model, of the HDPE were similar to measured reciprocal half times at high supercoolings of a similar HDPE by Patki and Phillips. It is also shown that the differential Nakamura model can be effectively used to model nonisothermal crystallization kinetics of HDPE resins. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

Crystallization and melting behavior of zenite thermotropic liquid crystalline polymers

The crystallization and melting behavior of a DuPont Zenite^TM series, namely, Z 6000 and Z 8000B, thermotropic liquid crystalline polymer (TLCP) have been investigated by differential scanning calorimetry (DSC). Both, non‐isothermal and isothermal crystallizations were carried out. From the non‐isothermal experiments, the crystallization temperature was found to be 234°C for a cooling rate of 10°C/min whereas it was only 228°C for 40°C/min for Z 8000B, and was found to be 296°C and 290°C, respectively, for Z 6000. In the isothermal experiment both the thermal and crystallization behaviors were studied as a function of the annealing temperature and annealing time. Two types of transition processes were evidence in the low temperature region of the isothermal crystallization. One is fast transition, which may be regarded as liquid crystal transition, and is characterized by the enthalpy, which is independent of annealing time. The other is slow process, related to crystal perfection, and it shows increases in the transition temperature and enthalpy, which is dependent on annealing time.