The seat material shall be one of the following materials: ethylene-propylene-diene monomer or fluoroelastomer with polytetrafluoroethylene bearing support at the top and bottom.
阀座材料应该是下列材料之一：乙烯-丙烯-二烯系单体或氟橡胶，在顶部和底部配置聚四氟乙烯轴承支撑。
Macquarie has seen a sharp increase in demand from big companies for bespoke hedging products for polypropylene and propylene.
麦格里银行已经观察到大公司对定制的针对聚丙烯和丙烯的对冲产品的需求有显著的增长。
The trouble is that the ethane route to making ethylene produces virtually no propylene.
问题在于这种用乙烷制作乙烯的生产流程几乎不会伴有丙烯产生。
Technologies do exist to manufacture propylene as an end in itself, rather than as a by-product.
科技确实可以将丙烯自身当作最终产物而不是作为一种副产品来制造。
Polypropylene is derived from propylene, which is in turn a by-product of a specific way of producing ethylene, a particularly useful hydrocarbon.
聚丙烯来自丙烯，而丙烯又是生产乙烯（一种特殊用途的碳氢化合物）所使用特殊工艺的副产物。
Many of the raw materials used in the petrochemical industry are unsaturated hydrocarbons, such as ethylene, propylene, butene and butadiene.
在石油化学工业中所用的许多原料是不饱和烃类，如乙烯、丙烯、丁烯和丁二烯。
Label Statement: Contains flavor, propylene glycol and ethyl alcohol.
标签声明：本品含有香精，丙二醇和乙醇。
A new correlation which predicts propylene yield is presented.
介绍一个新的预测丙烯产率的关联式。
Label Statement: Contains flavor, propylene glycol, ethyl alcohol and Caramel Color.
标签声明：本品含有香精，丙二醇，乙醇和焦糖色素。
Compares the main propylene carbonyl synthesis processes and the development of relative catalyst at home and abroad, and analyzes several methods of recovering waste Rhodium catalysts.
比较国内外丙烯羰基合成主流技术以及羰基合成催化剂的研究进展情况。
Polypropylene derived from a single monomer propylene.
由唯一的丙烯单体衍生的聚丙烯。
Optimization with HYSYS system on depropanizer operation for cracking unit can reduce propylene loss and ensure the high quality C4 product.
通过HYSYS模拟系统，来优化裂解装置脱丙烷塔的操作，减少丙烯损失，保证C4产品质量。
Chitosan was modified with propylene oxide in the presence of sodium hydroxide.
在碱性条件下用环氧丙烷对壳聚糖进行了改性研究。
In addition, the commercial application of newly developed DCC catalyst with high propylene selectivity was also summarized.
另外对新开发的高丙烯选择性催化裂解催化剂的工业应用情况进行了总结。
Synthesis technology and property of hydroxypropyl starch by using potato starch as raw material, propylene oxide as etherization reagent and sodium hydroxide as catalyst, were studied in this paper.
本文以马铃薯淀粉为原料，环氧丙烷为醚化剂，氢氧化钠为催化剂对低取代度羟丙基淀粉的制备工艺进行了研究。
It was found that the import polypropylene copolymers were random ethylene and propylene copolymers with long line chain polyethylene.
结果表明，进口共聚聚丙烯涂覆料是含有聚乙烯长直链的乙丙无规共聚聚丙烯。
If the synthesis of isopropyl acetate was manufactured by acetic acid and propylene, it would be a perfect atom economical technical route.
如果能以乙酸与丙烯直接酯化一步合成乙酸异丙酯，则是一条理想的原子经济反应工艺路线。
These enamel matrix proteins when suspended in a thickening agent (propylene glycol alginate - PGA) are retained on root surfaces for up to two weeks.
当材料悬浮于增稠剂(海藻酸丙二醇酯)时，这些釉质基质蛋白可以在牙根表面滞留长达两周。
The liquid phase bulk propylene polymerization in loop reactor was simulated based on the polymerization mechanism.
采用机理建模方法，研究了丙烯在环管反应器中的液相本体聚合过程。
Design and application of carbide slag in propylene oxide production were summarized.
总结了电石渣生产环氧丙烷工艺中的设计与应用。
The production of propylene by propane dehydrogenation has become the third source of propylene to meet the continuously increasing demand of propylene and its derivatives in the world.
针对目前全球丙烯及其衍生物需求量不断增长的趋势，丙烷脱氢制丙烯已成为第三位的丙烯来源。
And ethylene propylene diene monomer has been in the automotive sealing industry, widely used.
而三元乙丙橡胶已在汽车密封条行业中得到广泛的应用。
Improved tensile strength and elongation of ethylene propylene diene monomer compounds used for wire and cable.
提高电线电缆用三元乙丙橡胶材料的拉伸强度和伸长率。
Based on the preparation process of original catalyst for propylene polymerization, a new catalyst for the propylene polymerization was prepared by adding some modifier.
在原聚丙烯合成催化剂的基础上，通过在制备过程中加入调节剂，制备了一种新型催化剂。
This article analyzes the increasing trends of domestic propylene demand from 1983 to 1997 and forecasts domestic propylene demand in future several years by 5 methods.
分析了我国1983 - 1997年丙烯需求的增长趋势，用5种方法对我国未来几年的丙烯需求进行了预测。
This paper introduced briefly developing trend of propylene rectification technology in gas separating unit and analyzed theoretically the middle reboiler used in propylene rectification column.
简述了气分装置丙烯精馏技术的发展趋势，对丙烯精馏塔增设中间重沸器进行了理论分析。
This paper introduced briefly developing trend of propylene rectification technology in gas separating unit and analyzed theoretically the middle reboiler used in propylene rectification column.
简述了气分装置丙烯精馏技术的发展趋势，对丙烯精馏塔增设中间重沸器进行了理论分析。
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