聚乙烯工艺描述英文.docx

1、聚乙烯工艺描述英文UNIPOL PE Process DescriptionUNIPOL PE工艺描述Table of ContentsPROCESS DESCRIPTION1.1 Contract Plant Composition 1.1.1 PE Process Unit 1.1.2 Supporting Facilities 1.1.3 Auxiliary Facilities1.2 Process Introduction 1.2.1 Description of PE Process Unit 1.2.2 Description of Supporting Facilities 1

2、.2.3 Description of Auxiliary Facilities工艺描述1.1 装置组成 1.1.1 PE 工艺单元 1.1.2 配套设施 1.1.3 辅助设施 1.2 工艺介绍 1.2.1 PE 工艺单元描述 1.2.2 配套设施描述 1.2.3 辅助设施描述1.1 Contract Plant CompositionThe Contract Plant produces 300,000 TPY of pelleted Linear Low, Medium, and High Density Polyethylene from ethylene, which may invo

3、lve the addition of a comonomer (butene-1 or hexene-1) for some Products. The Contract Plant Battery Limits is represented in the diagram provided in Attachment 11 of this Appendix. The Contract Plant consists of the following systems.1.1 合同装置组成本合同装置是用乙烯为单体，可能会引入丁烯-1 或己烯-1 为共聚单体来生产高、 低、中密度聚乙烯树脂的装置，产

4、能为30 万吨/年。合同装置界区范围见本附件的附录1- 1。本合同装置由下列系统组成：1.1.1 PE Process UnitThe PE Process Unit utilizes Univation Technologies UNIPOL PE Process, a low pressure gas phase polymerization process, and includes the following process systems: Raw Material Supply and Purification Ethylene Purification Reaction (inc

5、ludes catalyst handling and feeding) Resin Degassing Vent Recovery Seed Bed System Resin Additive Handling Pelleting1.1.1 PE 工艺单元 PE 工艺单元采用 Univation 技术公司的 UNIPOL 聚乙烯技术，这是一种低压气相聚合工艺，包括下列工艺系统： -原料供给和精制 -乙烯精制 -反应 （包括催化剂处理和进料） -树脂脱气 -排放气回收 -种子床系统 -树脂添加剂处理 -造粒1.1.2 Supporting FacilitiesThe Supporting Fa

6、cilities for the PE Process Unit include the following process systems: Resin Handling System1.1.2 配套设施 PE 工艺单元的配套设施包括下列系统： -树脂处理系统1.1.3 Auxiliary FacilitiesThe Auxiliary Facilities for the PE Process Unit include the following process systems: Steam and Condensate Recovery System Flare Systems Wast

7、e Water Collection and Pretreatment System Utility Distribution System1.1.3 辅助设施 PE 工艺单元的工艺辅助设施包括下列系统： -蒸汽和冷凝水回收系统 -火炬系统 -废水收集和预处理系统 -公用工程配送系统1.2 Process IntroductionThe design of the PE Process Unit will incorporate the latest UNIPOL PE Process Know-how.1.2 工艺介绍 山西焦化聚乙烯装置的设计将采用最新的UNIPOL PE 工艺技术。 1.

8、2.1 Description of the PE Process UnitThe PE Process Unit comprises a number of process systems, which are described in detail in the following sections: Raw Material Supply and Purification (Part 1) Ethylene Purification (Part 2) Reaction (Part 4) Resin Degassing (Part 5A) Vent Recovery (Part 5B) S

9、eed Bed System (Part 5E) Resin Additive Handling (Part 6) Pelleting (Part 7)Process Flow Diagrams (PFDs) that represent these process systems are provided in Attachment 12 of this appendix.All of the equipment described in the following process description is included in the preliminary equipment li

10、st provided in Appendix 5.1.2.1 PE 工艺单元描述 PE 工艺单元由一系列工艺系统组成，下面对这些系统进行详细描述： 原料的供应和精制 （第1 部分） 乙烯的精制 （第2 部分） 反应 （第4 部分） 树脂脱气 （第5A 部分） 排放气回收 （第5B 部分） 种子床系统 （第5E 部分） 树脂添加剂处理 （第6 部分） 造粒 （第7 部分） 工艺流程图 （PFD）附于本附件的附录1-2。 下面工艺描述中涉及的所有设备见附件5 中的初步工艺设备清单。 Raw Material Supply and Purification (Part 1)Nitrogen and

11、 hydrogen are delivered to the Contract Plant Battery Limits by pipeline.Comonomers, butene1 and hexene1, and Induced Condensing Agent (ICA), isopentane, are supplied to the Contract Plant by pipeline. It has been assumed that sufficient storage capacity is available from the Outside Battery Limits

12、(OSBL) for butene1, hexene1, and ICA.Cocatalyst alkyl is received in shipping containers for use directly in the PE Process Unit.Comonomer PurificationA common purification system is provided for the two comonomers - butene1 and hexene1. Liquid comonomer from the Battery Limits is fed directly into

13、the Comonomer Degassing Column (C1008). The column, which is mounted on the Comonomer Surge Tank (C1007), is equipped with water cooled Comonomer Condenser (E1009) and steam heated Comonomer Reboiler (E1010). A small stream of overhead gas, containing stripped light gas contaminants vents to the fla

14、re. The bottom product from the Comonomer Surge Tank passes through Comonomer Cooler (E1011). The coolers primary purpose is to provide adequate NPSH for the Comonomer Charge Pump (G1002 or G1003, an installed spare). The Comonomer Charge Pump boosts the comonomer pressure to approximately 2,861 kPa

15、g (415 psig) for flow into the Reactor. From the Comonomer Charge Pump, comonomer flows through the Comonomer Dryer (C1004 or C1005) to remove water and other polar impurities from the comonomer stream by physical adsorption. The molecular sieve beds require periodic regeneration with hot nitrogen.

16、The spare Comonomer Dryer is used while the other is being regenerated, thus allowing uninterrupted comonomer flow.Nitrogen PurificationNitrogen from the Battery Limits passes through the Nitrogen Preheater (E1108) before entering the Nitrogen Deoxo Vessel (C1109 or C1111). The Nitrogen Deoxo Vessel

17、 contains a fixed bed of free copper catalyst which removes oxygen from the nitrogen stream by oxidation of copper to copper oxides. The catalyst bed requires periodic regeneration with a stream of hydrogen diluted in hot nitrogen. Nitrogen leaving the Nitrogen Deoxo Vessel is fed to the Nitrogen Dr

18、yer (C1112). The Nitrogen Dryer contains molecular sieves which remove water and other polar impurities from the nitrogen stream by physical adsorption. The molecular sieve bed requires periodic regeneration with hot nitrogen. The spare Nitrogen Dryer is used while the other is being regenerated, th

19、us allowing uninterrupted nitrogen flow.High pressure purified nitrogen is utilized in the Reaction System, while low pressure purified nitrogen is supplied to various places throughout the PE Process Unit. Purified nitrogen to be compressed for use in the Reaction System is taken from the outlet of

20、 the Nitrogen Dryer. The pressure is boosted by Nitrogen Compressor Package (K1102) to a pressure of about 3,309 kPag (480 psig). The high pressure purified nitrogen then passes through Purified Nitrogen Filter (Y1114) and flows on to the Reaction System.Hydrogen PurificationHydrogen supply from the

21、 Battery Limits is preheated in the Methanator Heater (E1204) before entering the Methanator (C1205). The Methanator contains a fixed bed of catalyst which converts carbon monoxide and carbon dioxide in the presence of hydrogen to form methane and water. Hydrogen leaving the Methanator is cooled in

22、the Methanator Aftercooler (E1206) to approximately 40 deg C and is fed to the Hydrogen Dryer (C1207). The Hydrogen Dryer contains molecular sieves which remove water from the hydrogen stream by physical adsorption. The molecular sieve bed requires periodic regeneration with hot nitrogen. The Hydrog

23、en Dryer is bypassed while being regenerated, thus allowing uninterrupted hydrogen flow.Hydrogen from the Hydrogen Dryer is fed to the Reaction System or to the deoxo vessels within the Purification System.ICA PurificationThe UNIPOL PE Process uses isopentane as an Induced Condensing Agent (ICA) wit

24、hin the Reaction System to enhance heat removal. Isopentane from the Battery Limits is fed directly to the ICA Degassing Column (C1421). The column, which is mounted on the ICA Surge Tank (C1406), is equipped with water cooled ICA Condenser (E1422) and steam heated ICA Reboiler (E1415). A small stre

25、am of overhead gas, containing stripped light gas contaminants is vented to flare. The bottom product from the ICA Surge Tank passes through the ICA Cooler (E1423). The primary purpose of the cooler is to provide adequate NPSH for the ICA Charge Pump (G1412 or G1413, an installed spare). The ICA Cha

26、rge Pump boosts ICA pressure to approximately 3,137 kPag (455 psig) for flow into the Reactor. From the ICA Charge Pump, the ICA flows through the ICA Dryer (C1419 or C1420) to remove water and other polar impurities from the ICA stream by physical adsorption. The molecular sieve beds require period

27、ic regeneration with hot nitrogen. The spare ICA Dryer is used while the other is being regenerated, thus allowing ICA flow to continue through the ICA Purification System.AlkylAdditive T2, an alkyl, is used in Ziegler-Natta catalyzed polymerization and is considered to be a hazardous material in so

28、me locations because of its reactive nature. Purified nitrogen is used to pressure the alkyl from the shipping container to the T2 Feed Pot (C1505) and then to the T2 Charge Pump (G1503 or G1504, an installed spare). These pumps pressure the alkyl to approximately 3,137 kPag (455 psig) for feed to t

29、he Reaction System.All vents from the Additive T2 System are routed to the Seal Pot (C1502) and combined with mineral oil to produce a less reactive solution. Periodically, the Seal Pot contents are drained to a disposal tank for disposal by an offsite disposal contractor.Mineral oil is pumped from

30、supply drums by Mineral Oil Drum Pump (G1514) to the Seal Pot for dilution of alkyl. Alternately, the Mineral Oil Drum Pump may be used to transfer mineral oil from the supply drums to the Mineral Oil Blow Tank (C1512). Mineral oil from the Mineral Oil Blow Tank is used for flushing the Additive T2 System for maintenance.原料的供应及精制 （第1 部分） 氮气和氢气由管道输送至装置界区内。 共聚单体 （丁烯-1、己烯-1 ）及诱导冷凝剂 （ICA） （异戊烷）由界区内的配套设施提供。假定装置界区外有足够的丁烯、己烯及诱导冷凝剂 （ICA）储存。 助催化剂烷基铝用钢瓶直接运至PE 工艺单元。 共聚单体的精制 两种共聚单体丁烯-1 和己烯-1 共用一个精制系统。来自界区的液相共聚单体直接送入共聚单体脱气塔 （C-1008 ）。脱气塔位于共聚单体缓冲罐 （C-1007 ）之上，塔顶有一个水冷的共聚单体冷凝器 （E-100