本文简要介绍了某石化公司的Unipol聚丙烯工艺流程,分析了氧气对生产过程及产品质量的影响,采取相应的解决措施后,减少了从各环节进入生产工艺系统的氧气量,降低了氧气对装置生产及产品质量的影响.

采用Unipol气相流化床生产聚丙烯时,原料丙烯的质量对聚丙烯的生产具有重要影响.本文分析了CO、CO2、S等杂质对聚合反应的影响,针对这些问题提出了相应的解决方法.

采用国产CS-1-G型催化剂在200 kt/a的Unipol工艺气相聚丙烯装置上进行工业试生产,生产拉丝级聚丙烯,考察了CS-1-G型催化剂在该装置上使用的可行性.结果表明:CS-1-G型催化剂在Unipol工艺气相聚丙烯装置上具有较强的适应性,整个试用过程装置安全平稳运行,并且产品质量合格,全部为优级品.

在PACROS架构上,针对气相流化床聚丙烯装置先进控制系统设计了国产APC控制器,并将其在某石化企业Unipol聚丙烯装置上投用运行,考察了产品质量的控制情况,装置的平稳性及牌号切换功能等.运行结果表明,国产APC控制器投用后,装置平稳率提高5％,被控变量平稳率平均提高40.56％,聚丙烯单耗降至1.00195 t/t,比未投用APC控制器的装置单耗低;在丙烯充足时,装置的时空产率可提高1.5％以上.投用APC控制器后,产品的熔体流动指数和二甲苯可溶物含量计算精确高,满足在线闭环控制的要求,主要工艺指标计算结果准确可靠,满足指导生产操作的要求;可实现产品牌号自动切换,缩短产品牌号切换时间27％.

在Unipol聚丙烯工艺配套的丙烯精制塔切换过程中,甲基叔丁基醚(MTBE)含量异常增高,导致反应波动.优化工艺操作后初步缓解了精制塔切换过程中MTBE含量增高对聚合反应的影响,并列出了可能导致MTBE含量异常增加的原因.

介绍了ZSK320系列挤压造粒机的结构,讨论了SWZ 7000换网器在换网过程中遇到的问题并提出了解决方法.通过采取调节挤压造粒机负荷、调节筒体及模板温度、清理换网器滑道并涂抹硅油、调整节流阀开度等措施,控制了熔融泵的进出口压差,从而提高了在线自动换网的成功率,保证了挤压造粒机的长周期连续平稳运行.

分析了中国石油广西石化公司UNIPOL工艺聚丙烯装置在整个生产过程中的主要污染源,介绍了针对装置的共性问题采取的主要清洁生产措施,并提出了相应的改进方向.

In order to control the production quali-ty of polypropylene fiber,the melt flow rate(MFR) and molecular weight and distribution of polypropyl-ene were correlated,and the relation curve of charac-terizing molecular weight and its distribution was es-tablished.The results showed that with the increasing of melt flow rate of polypropylene fibre,weight aver-age molecular mass(Mw),Z-average molecular mass (Mz)and molecular mass distribution (Mw/Mn)de-creased gradually. Polypropylene fibre lgMwand lgMz,lgMFR had a good linear correlation, the linear correlation between Mwand MFR was lg Mw=-0.293 77 lgMFR+5.741 19,correlation coefficient was 0. 995. The linear correlation between Mzand MFR was lgMz= -0.432 04 lgMFR+6.575 46,cor-relation coefficient was 0.989. The relationship be-tween Mw/Mnand MFR was Mw/Mn=5.547 95-2.942 65 lgMFR+0.999 88 (lgMFR)2-0.137 93 (lgMFR)3,the correlation coefficient was 0.994.The molecular mass and its distribution estimated by fitted formula was similar with the actual values.

针对某厂聚丙烯车间挤压造粒单元出现的导热油结焦现象,文章分析了结焦的主要原因,并进行了操作优化和相应的技术改造,即在导热油管线上新增了气动控制阀进行排气,并引进惰性气体进行氮封保护,防止导热油结焦.

The high-density polyethylene (PE-HD) resin was fractionated by different methods,and its branch structure and distribution were investigated.A three-dimensional relationship graph for the short-chain branching content,elution temperature and molecular weight was established by a combination of temperature rising elution fractionation and other cross-fractionation methods,which well reflected the branch-structural distribution characteristics of PE-HD.The results indicated that the PE-HD resin was composed of four parts including a low molecular wax containing a certain amount of branch structure,a part of linear low-density polyethylene with larger short-chain branching numbers,a part of high-density polyethylene with small short-chain branching numbers,and the linear polyethylene almost without any branching chains.It was also found that the fraction of the linear low-density polyethylene increased with an increase of relative molecular weight,whereas the part of the high-density one kept a uniform molecular weight distribution.

This paper reviews the basic properties,application and production capacity of biaxially oriented polypropylene (BOPP)film in China as well as the research and development of the grade,structure and usage of the resin in advanced polyolefin companies.The structural characteristics and properties such as melt flow rate,isotactic index,ash,relative molecular mass and molecular weight distribution are also introduced.It suggests that the BOPP plants and BOPP film manufacturers should cooperate mutually to develop new BOPP film that meets the requirements of the market and reduce the dependence of imported resin according to the properties and demands of the resin in China.

介绍了CUDT外给电子体在某炼厂Unipol工艺聚丙烯生产装置上的工业试验情况。工业试用期间装置运行平稳，分别与国产和进口催化剂匹配生产不同产品，结果显示，与其他国产和进口外给电子体相比，CUDT活性高，定向能力强，产品性能优，经济效益好，在一定领域内可以替代其他外给电子体，在Unipol工艺聚丙烯生产装置上进行工业应用。

Three ether-ester compounds which as internal electron donors were applied to the preparation of solid catalysts for olefin polymerization were synthesized through the esterification reaction between 1,3-dimethoxypropane-2-ol(an intermediate) and aliphatic dicarboxylic acid mono-ester acyl chlorides. The internal electron donor compounds were characterized by means of 1H NMR and thin layer chromatography. The activities of the catalysts in propylene polymerization were evaluated. As ether bonds in these compounds were not introduced by the traditional O-alkylation reaction,using of the highly toxic O-alkylating reagents,such as iodomethane,and very strong basic deprotonating reagents,such as alkoxide or metal hydride,could avoid being used. When the ether-ester compounds were used as internal electron donors,the catalysts showed high catalytic activity in propylene polymerization.

Gel permeation chromatograph, infrared spectroscopy(IR) and scanning electron microscope (SEM) are used to observe the impacts of the relative molecular mass, ethylene content, rubber phase content and phase state structure on the mechanical properties of high fluidity and impact polypropylene copolymer, K7227H, in terms of impact strength fluctuations during its production. When the total mass fraction of ethylene is6.81%, the ambient temperature impact strength of K7227H is increased to11.1 kJ/m2 by adjusting the melt flow rate ratio in the first and second gas phase reactor as well as the mole ratio of hydrogen and ethylene in second gas phase reactor, which realizes high impact strength of K7227H under low ethylene content and ensures the product rigidity based on process control.

以国内引进的第一套DOW化学UNIPOL气相法流化床工艺聚丙烯装置为应用背景,介绍了APC(Advanced Process Control)的功能设计和建模特点,考察了APC(先进过程控制)在中国石油广西石化公司20万t·a-1气相法聚丙烯装置的工业实际应用优点以及存在的问题。结果表明,APC对反应器及产品质量的控制起到了很好的稳定和优化作用.

A new polyethylene catalyst PGE-100 was developed,its kinetics was studied in slurry polymerization and gas phase polymerization respectively,the influences of temperature and time on the catalyst activity were investigated,and the hydrogen response,copolymerization performance and its stability for ethylene/1-butylene of the catalyst were evaluated.The results showed that the kinetics of PEG-100 behaved as the mode of rapid initiation and rapid attenuation,and the catalyst exhibited its higher activity mainly in early reaction stage.Under the conditions of slurry polymerization,the catalyst efficiency increased with extending polymerization time,and first increased and then decreased with raising polymerization temperature,and reached the maximum at 85℃.The hydrogen response and the copolymerization performance of ethylene/1-butylenes of PEG-100 were good and stable,and the repeatability was better for different batches of the catalyst.

With rapidly increase of PP consumption and the fast development of production,the third generation gas-phase process of the most advanced,low cost,low energy consumption,short procedure,easy operation,no deashing,no removing random copolymermore,brands,high value-added grades had been the most widely used.Based on the introduction of polypropylene polymerization process,some major gas phase process,technical features and development status of PP process was summarized,the application of the process gas phase in our country and its prospects were discussed.