丁苯橡胶后处理单元长周期运行的技术改进

后处理单元作为丁苯橡胶最后一个生产单元,由凝聚系统、干燥系统、成型包装组成,其具体作用是将胶乳凝聚析出胶粒,胶粒经过洗涤、干燥、自动称重、压块、包装成橡胶产品。对某企业丁苯橡胶后处理单元非计划停工的原因进行分析,对设备及工艺流程进行优化改进以解决生产瓶颈,延长了后处理单元运行周期。     

影响乳聚丁苯橡胶装置凝聚单元平稳运行的因素

介绍了南京扬子石化金浦橡胶有限公司丁苯橡胶装置凝聚单元的简要流程及胶乳的稳定与破乳。详细分析了搅拌、助剂、温度3个方面的因素对丁苯橡胶装置凝聚单元平稳运行的影响,为如何确保凝聚单元的平稳运行提供了参考。     

丁苯橡胶后处理系统风送管线结垢分析与处理

丁苯橡胶装置后处理风送管线结垢,对后处理单元的平稳运行和产品质量产生了严重的影响。通过分析结垢物组成,结合后处理生产实际,采取具体措施,基本消除结垢问题,保证产品质量。     

南京扬金橡胶公司建设10万吨/年顺丁橡胶装置

为增加产品品种，实现规模效益，南京扬子石化金浦橡胶有限公司新建10万吨／年顺丁橡胶装置。该项目位于南京化学工业园长芦二期开发区，装置主要包括配制计量单元、聚合单元（由两条生产线组成）、胶罐单元、凝聚单元（由三条生产线组成）、后处理单元（由三条生产线组成）、回收单元。以1．3-丁二烯为原料，选用QPEC顺丁橡胶生产技术、国际先进工艺路线，     

丁苯橡胶装置单体回收单元长周期运行的探讨

以丁苯橡胶装置为研究对象,分析单体回收单元关键设备易堵聚、运行周期短的原因,通过优化工艺操作条件、进行技术改造、规范操作等手段,延长单体回收系统的运行周期,达到连续平稳生产节能降耗的目的。     

异戊橡胶中试装置危险性分析与安全管理

异戊橡胶生产技术开发中试装置，采用自主研发的稀土催化溶液聚合技术，以异戊二烯为原料，己烷为溶剂，在稀土催化剂作用下合成异戊橡胶。装置由工艺装置及辅助设施组成。其中主装置包括：原料精制回收单元、聚合反应单元、凝聚干燥后处理单元、罐区等。辅助设施有控制室、配电间、空压机间、冷冻机房、循环水系统、消防水系统等。装置大量使用己烷、异戊二烯等危险化学品，存在火灾、爆炸和人员伤害的风险。罐区已经构成四级重大危险源，特别是在检修过程中风险更大。因此针对此风险，采取了针对性的安全措施，使装置本身尽量达到本质安全，在规程、制度及安全管理等方面做了大量细致的工作，经过累计开车700h的运行，实现了安全开车，积累了宝贵经验，为异戊橡胶生产技术开发奠定了坚实基础。     

歧化反应催化剂应用情况分析

歧化反应催化剂性能的优劣是影响芳烃联合装置操作的一个重要因素,它不但影响着本单元的操作而且还影响下游装置的进料组成和装置能耗,文章分析了中海炼化惠州炼化分公司197.9 wt/a歧化及烷基转移单元催化剂在使用周期内反应条件及其反应性能。从保护催化剂的角度出发总结了EM-1000催化剂适宜的使用条件及调整注意事项,为催化剂长周期运行提供了实践依据。     

乳聚丁苯橡胶后处理工艺技术改进

乳聚丁苯橡胶生产中,后处理单元是决定产品质量的关键环节。针对后处理单元非计划停车频繁、运行周期短的状况,从工艺、设备、现场管理等方面进行了分析,找出影响后处理单元稳定运行的主要因素并进行了改进。     

辅助凝聚剂对ABS装置凝聚和脱水系统的影响

在丙烯腈-丁二烯-苯乙烯共聚物生产装置中,凝聚干燥单元易出现凝聚颗粒形态不佳、结构松散、浆液水层浑浊、真空过滤机滤布堵塞、脱水机电流超限和湿粉料含水量高等问题,严重制约了装置的生产能力。在凝聚过程熟化阶段加入辅助凝聚剂,可显著改善凝聚效果。结果表明:加入的辅助凝聚剂占凝聚浆液中固体质量的1.0%~2.0%时,凝聚废水中化学需氧量减少近60%,悬浮物减少97%,湿粉料含水质量分数由23.6%~23.9%降至19.4%~20.1%;辅助凝聚剂的使用对凝聚、脱水、干燥等单元操作的长周期连续稳定运行和最终产品质量无不良影响。     

100 kt/a硫黄回收装置尾气提标单元运行总结

介绍了硫黄回收装置尾气提标单元的工艺原理和特点.详细分析了生产过程中遇到的问题并提出解决办法.通过有针对性地对尾气提标单元进行工艺改造,同时对硫黄回收装置停工过程工艺流程进行优化,实现了联合装置全运行周期内的达标排放,且连续达标运行超过600 d.为同类装置长周期达标排放技术改造提供参考.     

丁苯橡胶生产废水整改的必要性及工艺路线

论述了某化工厂丁苯橡胶生产废水的特性及对厂区污水处理场运行的影响;通过采用各种工艺技术对该废水进行小试并对水质数据比对,得出适合丁苯橡胶生产废水改造的工艺路线,使经预处理后的水质不会对污水处理场生化系统造成冲击。     

丁苯橡胶生产及市场分析

综述了国内外丁苯橡胶的生产及市场情况,对国内丁苯橡胶的市场发展趋势进行了分析。此外,还对国内丁苯橡胶行业存在的不足提出了几点建议。     

高转化率乳聚丁苯橡胶聚合过程中乳液相对分子质量分布与粒径分布考察

采用中石油吉化分公司乳聚丁苯橡胶高转化率大生产配方,考察了实验室聚合反应釜聚合反应单体转化率随反应时间的变化,采用激光粒度分析仪和凝胶渗透色谱仪测定了聚合反应不同单体转化率的胶乳的粒径分布与分子质量分布,结果表明：胶乳粒径呈正态分布,粒径主要集中分布在0.1μm附近,胶乳的平均粒径随反应时间的延长逐渐增大,但是增加的幅度越来越小;聚合反应时间在11 h前（即转化率小于72%）,胶乳的重均分子质量、Z均分子质量一直增大,而数均分子质量变化无明显规律;而分子质量分布宽度指数随反应的进行变小,表明调整的高转化率配方合成的丁苯橡胶可有效改善聚合生成的胶乳粒径分布。     

Synthesis and characterization of ABS resin using in situ transferring from emulsion to suspension polymerization

A novel approach based on an emulsion in situ suspension polymerization process for synthesizing poly(acrylonitrile–butadiene–styrene) (ABS) resin is reported. Experimental results show that the reaction system can be transformed from an emulsion state to a suspension polymerization state steadily with the content of polybutadiene (PB) in the range 0–15 wt% in ABS resin. When PB is replaced by poly(styrene‐co‐butadiene) with the content of rubber particles being kept below 20 wt%, the emulsion system can be easily transferred to the suspension polymerization state through a process of latex coagulation in the forward direction, which means that the emulsion solution was dripped slowly into the suspension reaction system in the presence of coagulating agent. The dispersion status of the rubber particles in the ABS resin was studied using transmission electron microscopy, which indicated that the rubber particles were in a dispersed state in a continuous matrix of poly(styrene‐co‐acrylonitrile) when the content of rubber particles was below 20 wt%. The mechanical properties of the ABS resins obtained are as follows: elongation at break, 9.4–45.7%; yield tensile strength, 35.1–42.2 MPa; impact strength, 98.2–116.3 J m^?1. Copyright © 2006 Society of Chemical Industry     

Softening phenomenon by remilling of styrene–butadiene copolymer rubber–general-purpose polystyrene resin blend

The softening phenomenon by remilling of uncured blends of various commercia styrene—butadiene copolymer rubber (styrene content, 23.5 to 48 wt-%, styrene block 0 to 18 wt-%) with general-purpose polystyrene resin was mainly studied by examining the blend ratio dependence of hardness and compression modulus (in logarithmic form), with special attention to the state of dispersion of the polymers. It was found that the blend of styrene—butadiene copolymer rubber with general-purpose polystyrene resin forms a microheterogeneous polymer blend system and that the hardness and the compression modulus change in S-shaped curves versus blend ratio. However, the degree of softening phenomenon by remilling (roll surface temperature, 70°–90°C) was found to be different for the two blend systems, i.e., random styrene—butadiene copolymer rubber and block styrene—butadiene copolymer rubber. The softening phenomenon is more pronounced in random-type rubbers; and in some block-type rubbers, no softening phenomenon was observed. The influence of the styrene content of the polymer is small. Further discussions have shown us that the strong interaction between the polystyrene block of the copolymer and the styrene homopolymer of the general-purpose polystyrene resin controls the state of dispersion of polymers thereby causing this difference in the softening phenomena among the different kinds of styrene—butadiene copolymer rubbers.     

Toughening and Compatibilization of Acrylonitrile–Butadiene–Styrene/Poly (Ethylene Terephthalate) Blends Using an Oxazoline-Functionalized Impact Modifier

An oxazoline-functionalized core–shell impact modifier was synthesized between aminoethanol and acrylonitrile/butadiene/styrene high rubber powder. According to the Fourier transform infrared spectroscopy test, the nitrile groups were partially converted into oxazoline groups successfully. The oxazoline-functionalized acrylonitrile/butadiene/styrene high rubber powder was used as an impact modifier for acrylonitrile–butadiene–styrene/poly(ethylene terephthalate) blends. The differential scanning calorimeter and rheological tests demonstrated that poly(ethylene terephthalate) was partially miscible with acrylonitrile–butadiene–styrene, because the oxazoline groups of oxazoline-functionalized acrylonitrile/butadiene/styrene high rubber powder reacted with the end groups of poly(ethylene terephthalate). The results of scanning electron microscopy indicated that the morphology of acrylonitrile–butadiene–styrene/poly(ethylene terephthalate) blends with proper oxazoline-functionalized acrylonitrile/butadiene/styrene high rubber powder content was improved significantly. The best mechanical properties were achieved, When 6 wt% oxazoline-functionalized acrylonitrile/butadiene/styrene high rubber powder was added into acrylonitrile–butadiene–styrene/poly(ethylene terephthalate) blends.     

SSBR2530在轮胎胎面胶中的应用

研究溶聚丁苯橡胶(SSBR)2530等量代替乳聚丁苯橡胶(ESBR)1712在轮胎胎面胶中的应用.结果表明,与ESBR1712胶料相比,SSBR2530胶料具有较好的耐磨和耐屈挠疲劳性能,并且生热较低.采用SSBR2530的成品轮胎与采用ESBR的成品轮胎相比,胎面胶物理性能相似,经济效益显著.     

基于BP神经网络优化制备化学改性脱硫灰/丁苯橡胶复合材料

以化学改性脱硫灰取代部分炭黑与丁苯橡胶复合制备化学改性脱硫灰/丁苯橡胶复合材料,运用均匀设计结合BP神经网络建立制备工艺参数与力学性能的BP神经网络优化模型,获得制备最优化学改性脱硫灰/丁苯橡胶复合材料的工艺参数,对最优复合材料进行了表征. 结果表明,最优化学改性脱硫灰/丁苯橡胶复合材料的制备参数为促进剂N-叔丁基-2-苯并噻唑次磺酰胺用量1.2 g、硫磺用量1.3 g、硬脂酸用量1.1 g、氧化锌用量2.4 g、硫化时间27 min,该条件下所制复合材料的拉伸强度为20.31 MPa、撕裂强度为45.68 kN/m、邵氏A硬度为66,最优实测值与最优模型预测值吻合较好,相对误差为3.03%~3.22%.     

NR/SBR乒乓球拍胶皮的制备研究

以天然橡胶（NR）与丁苯橡胶（SBR）并用制造乒乓球拍胶皮。研究了并用比、促进剂、碳酸钙用量对NR/SBR并用胶性能的影响。研究结果表明,NR/SBR质量比为80/20,促进剂二硫化二苯并噻唑（DM）、2-硫醇基苯并噻唑（M）、二苯胍（D）各1.25、1.25、2.5份,共用量5份,并用胶具有最大拉伸强度和扯断伸长率;碳酸钙为260份,胶皮无喷霜。