乳聚丁苯橡胶装置生产工艺的优化

总结了近年来兰州石化公司合成橡胶厂丁苯橡胶装置技术进步的情况。对乳化剂歧化松香酸钾皂中的“有效皂”成分实施有效监控 ,可使工艺更加平稳 ;适当提高脂肪酸皂的用量并使其与歧化松香酸钾皂保持合理的配比 ,可提高聚合效率并有利于产物的 30 0 %定伸应力。用乙二胺四乙酸铁钠盐替代硫酸亚铁体系作引发剂应是今后的趋势 ,聚合系统 pH值的控制范围亦为 11.2± 0 .2。采用控制各个聚合釜温度或几台釜组合调节温度的方法可较好地控制转化率 ,而通过调节单体加料量则可以控制反应时间 ,从而优化工艺控制。将闪蒸槽用湿润蒸汽加热 ,并对脱气系统实行加热梯度控制以及增加关键部位的阻聚剂用量 ,都能使装置的运行周期得以极大地延长。     

丁苯橡胶装置生产线运行优化研究

介绍中国石油独山子石化公司乙烯厂年生产能力为18万t的丁苯橡胶(SBR)装置生产线的运行优化措施。针对生产中存在的设备故障和设计缺陷问题,通过对聚合釜搅拌器底部轴承、后处理干燥机筒体设计,如材质、压力控制系统和引发剂插底管等进行改造,SBR装置生产线运行优化,有效避免装置非计划停工、循环等异常情况,检修频率降低,实现了装置长周期运行,增产增效。     

丁苯橡胶装置后处理凝聚系统优化改造

后处理系统是丁苯橡胶装置的最后一个生产单元,其运行状况的好坏直接决定着橡胶的品质及装置的运行周期。其中凝聚工序在整个后处理单元中占有重要地位,装置开工以来,通过对凝聚原理和工艺操作条件的摸索优化,找到最佳的凝聚条件、操作方法,从而达到提高产品质量,降低劳动强度,延长后处理运行周期的目的。     

乳聚丁苯橡胶成套技术创效近亿元

以吉林石化为主体开发的“乳聚丁苯橡胶成套技术”日前摘得2008年中国石油10项重大科技进展和中国石油集团公司科技进步一等奖两项桂冠,这是中国石油下游板块第一项有影响力的成套技术开发成果。开发这项技术投入并不多,但大幅度提高了装置产能,节能减排效果明显,年可获得直接经济效益近亿元。     

万吨级溶聚丁苯橡胶装置投产

万吨级溶聚丁苯橡胶装置投产北京燕山石化公司研究院经过十几年研究开发的年产万吨级溶液聚合丁苯橡胶装置，日前投产成功，填补了国内空白。经检测，产品主要性能指标达到设计要求，其物理机械性能完全达到国外同类产品水平。它的投产改变了此胶种长期依赖进口的局面，可...     

普利斯通惠州的丁苯橡胶装置投产

普利斯通公司旗下的普利斯通（惠州）合成橡胶公司宣布,该公司在广东惠州的合成橡胶装置投产,新装置生产丁苯橡胶（SBR）,产能为5万吨／年。     

丁苯橡胶装置回收系统存在问题的探讨

丁苯橡胶装置回收系统存在问题的探讨周加伦（齐鲁石油化工公司橡胶厂，淄博，２５５４３８）１问题及原因分析１．１苯乙烯回收系统废水中苯乙烯含量超标８万ｔ／ａ丁苯橡胶装置苯乙烯回收系统废水中苯乙烯含量设计值为２００×１０－６，实际值严重超标。其原因是：（１...     

丁苯橡胶装置VOCs废气治理方案探讨

某企业丁苯橡胶装置化学品配制厂房配料时散发的异味,通过厂房轴流风机经除尘后直排大气,混合槽、凝聚工段散发的废气直排大气,干燥箱排放的废气通过碱洗后也直排大气,不但造成环境污染,车间异味严重,严重危害操作人员的身体健康,不能满足现行排放标准,需对装置涉VOCs物料的化工生产过程的废气进行收集,并且输送至VOCs治理装置,以满足环保、安全卫生要求。根据《重点行业挥发性有机物综合治理方案》的规定和实际情况,在诸多治理方法中比选出除尘+电加热蓄热催化燃烧工艺方案,并在尾气排放口增设在线监测系统。上述废气经过VOCs治理装置处理后,非甲烷总烃（NMHC）去除率≥97%,苯乙烯、1,3-丁二烯等有机特征污染物排放浓度均达到规范要求的排放标准。     

Effects of rubber/filler interactions on deformation behavior of silica filled SBR systems

Effect of rubber/filler interactions on the stress-strain behavior for silica filled styrene-butadiene rubber (SBR) vulcanizates were studied in relation to the chain scissions of rubber molecules during deformation. The rubber/filler interactions were controlled by the modification of silica surface using several kinds of silane coupling agents. Information on the chain scission was obtained by the electron spin resonance (ESR) measurements. The combination of ESR results and stress-strain data revealed that, at a given strain, the tensile stress increased with increasing the interfacial interactions between rubber molecules and silica surface, and simultaneously the chain scission became remarkable. Further, the degree of chain scission was closely related to the mechanical energy applied to the vulcanizates. The cyclic tests of stress-strain measurements suggested that the chain scissions contributed to the Mullins effect.     

Structure and mechanical properties of rare-earth complex La-GDTC modified silica/SBR composites

A rare-earth complex, La-GDTC, is investigated as novel interfacial modifier for SBR/SiO₂ composites. According to model compounds, it is found that the chemical structure of La-GDTC toward silica is originated from hydrogen bonds and coordination bonds. The La-GDTC can effectively facilitate the fine dispersion of silica particles into the SBR matrix. Moreover, a jump in the normalized heat capacity ΔC_pn at the glass transition region and about 1.6-10.9% of the weight fraction of immobilized polymer layer χ_im in the SBR/La-GDTC/SiO₂ composites are revealed. The La-GDTC can tune the origin polymer main chain into a softer one by endowing side chains, leading to a decrease in tan δ, as well as the glass transition temperature, of SBR/La-GDTC/SiO₂ composites. Mechanical properties of SBR/La-GDTC/SiO₂ vulcanizates are largely improved and better than those of the SBR/ZDC/SiO₂ vulcanizates. Thus, a reinforced mechanism of the La-GDTC system is proposed, which can account for the experimental observation well.     

优化乙烯石脑油提高乙烯收率

介绍广泛分公司加工原油的特点和乙烯石脑油组成与乙烯收率的关联情况，分析了影响乙烯收率的主要原因，并着重论述了优化乙烯石脑油的具体措施。     

Modification of starch for high performance elastomer

Because conventional filler carbon black (CB), used for elastomer reinforcement, is wholly dependent on the non-renewable petroleum resource, a novel starch modification for filler-reinforced elastomer is developed using two types of modifiers, i.e. resorcinol-formaldehyde (RF) and a silane surfactant (S). Originally used as a curing agent for rubber vulcanization, the RF is here designed to interact with starch and rubber, and thus improve the interface. The S is expected to improve the dispersion of starch particles and enhance the compatibility. The RF achieved much higher reinforcement than the S. When the starch was co-modified by both, the mechanical property improvement of styrene-butadiene rubber (SBR) was superior to that reinforced by CB. Modification mechanism was explained as that (a) the RF forms oligomer, and (b) the oligomer then undergoes condensation/crosslinking, which combines starch particles and SBR macromolecules firmly. This mechanism was subsequently proved by a suspension experiment, which refers to the experiment that measures the compatibility of modified starches with SBR in solutions of dissolved compounded SBR. Transmission electron microscopy shows that most of the modified starch particles are dispersed on nano-scale; scanning electron microscopy indicates fine morphology achieved by the modification.     

MEK wiping prior to chlorination to improve the adhesion of vulcanized SBR rubber containing paraffin wax

In this study, it was shown that the degree of effectiveness produced by halogenation with trichloroisocyanuric acid (TCI) was influenced by previous methyl ethyl ketone (MEK) wiping of a synthetic vulcanized styrene-butadiene rubber (R2) surface. The MEK wiping of the R2 rubber surface prior to chlorination with TCI removed the paraffin wax layer from the surface, which favoured the chlorination and oxidation reactions of the rubber. Chlorination with TCI decreased the contact angle values (increased the wettability) mainly due to the creation of C–Cl and C=O moieties, as well as roughness. The amount of these chemical moieties increased when the MEK wiping was applied prior to chlorination, so higher degrees of chlorination and oxidation were obtained on the R2 rubber surface. T-peel strength values increased more markedly if the MEK wiping was carried out before chlorination with TCI, in agreement with the higher degree of modifications produced in the R2 rubber surface. In fact, a cohesive failure in the R2 rubber was obtained in the adhesive joint produced with MEK wiped + TCI chlorinated R2 rubber.     

New fabricate of styrene-butadiene rubber/montmorillonite nanocomposites by anionic polymerization

Styrene-butadiene rubber/montmorillonite (SBR/MMT) nanocomposites were successfully synthesized by in situ living anionic polymerization with n-BuLi as initiator. The results from kinetics study and ¹H NMR indicated that the addition of organophilic montmorillonite (OMMT) did not changed the living copolymerization and the components of the copolymer on the whole when OMMT content was lower than 3 wt %. However, gel permeation chromatography showed that the introduction of OMMT resulted in small amount of high-molecular weight fraction of SBR in the composites, leading to an increase in the weight-average molecular weight and polydispersity index, but the unchangeableness of the number-average molecular weight. The result from transmission electron microscopy and X-ray diffraction revealed that a completely exfoliated structure existed in the nanocomposite with 25 wt % styrene and OMMT content from 1 to 4 wt %, and styrene played an important role in the expanding of OMMT layers. Moreover, the nanocomposites possessed higher glass-transition temperature, thermal stability, tensile strength and elongation at break than SBR when the OMMT content ranged from 2.5 to 4 wt %. A schema was proposed to illustrate the formation of the nanocomposite and the exfoliation structure with physical cross-linking between SBR chains and OMMT.     

氨制冷系统在丁苯橡胶装置的作用及注意事项

以某石化企业丁苯橡胶装置为研究对象,分析了氨制冷压缩机重要参数的设定及其意义,并针对氨系统开停工过程中常见问题提出注意事项及对策,对类似橡胶装置氨系统具有较强的借鉴意义。     

Optimization of the chain transfer agent incremental addition in SBR emulsion polymerization

The incremental addition of chain transfer agent (CTA) in an emulsion styrene‐butadiene polymerization reaction was optimized, using a chemometric approach that involves (a) an experimental design, in which the amount of CTA in each addition were the factors; (b) an artificial neural network modeling to obtain responses for each required processability property (i.e., Mooney viscosity and number‐ and weight‐average molecular weight); and (c) a simultaneous desirability response, due to several properties had to be optimized at a time. As a result, an 8% increase in productivity was accomplished, and some relationships were derived among CTA additions and polymer evolution, Mooney viscosity and molecular weights. The study was carried out to further apply this strategy in the production plant. The challenge was to keep the quality of the produced polymer, particularly in terms of processability. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

环化丁苯橡胶的表征

在ＳＢＲ中加入环化试剂ＡｌＥｔ２Ｃｌ－Ｃ６Ｈ５ＣＨ２Ｃｌ,在１２０℃,２０ｍｉｎ条件下制备了环化ＳＢＲ,并借助ＩＲ,＾１Ｈ－ＮＭＲ,ＤＳＣ,ＧＰＣ等方法对产物性能进行了表征。结果表明,二国本溶剂参与了环化反应,且随环化度增加,参与反应的二甲苯量也逐渐增加,并确定了环结构的形成。利用＾１Ｈ－ＮＭＲ谱图导出了环化ＳＢＲ的环化度和溶剂参与量的计算公式。