CN1917951A - 用于控制固体聚烯烃从连续反应区的回收的方法和设备 - Google Patents
用于控制固体聚烯烃从连续反应区的回收的方法和设备 Download PDFInfo
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Abstract
聚合方法和环流反应器，包括在环流反应器内在液体稀释剂中聚合烯烃以生产包含正常固体聚合物粒子的液体淤浆，使聚合物在沉降腿中沉降，周期性开启位于沉降腿末端的180°旋转产物取出阀以使粒子装料流出沉降腿，产物取出阀由气动双作用驱动器操作，气动系统由包括气动控制阀的系统调节，改进在于使用自动控制阀，它是自动V形球阀。
Description
本发明涉及固体聚烯烃从这样固体物质的淤浆中的取出。在特定的方面，本发明涉及用于控制粒状聚烯烃从其淤浆，例如从在环流反应器中连续流动的聚合混合物流中回收的方法和设备。
US-A-3,242,150公开了环流反应器的改进，该改进在于向环流反应器的底部加入接收区，该接收区从那时以后称为沉降腿(settling leg)，其中固体由重力沉降，并从该接收区取出浓缩固体的级分。
US-A-3,293,000公开了具有几个沉降腿的环流反应器。阀的控制描述于第3栏，2-22行。
US-A-3,374,211公开了脱除聚合物的改进方法。
更近来，US-A-5,183,866涉及与环流反应器的沉降腿的周期性操作结合，采用闪蒸管线加热器(flash line heater)。方法的特征为如下事实：构造伸长区，使得在包括闪蒸管线加热器的伸长限定区中淤浆装料的流动时间等于在沉降腿阀关闭和沉降腿阀下一次开启之间时间的至少约25％。
US-A-5,455,314公开了通过连续调节主流出管线中的V形缺口球阀和在主管线堵塞的情况下自动开启作为主控制阀备用设备，冗余管线中的控制阀，以连续方式控制包含聚合物产物的反应淤浆从聚合反应器中取出的方法。
本发明涉及一种聚合方法，该方法包括在环流反应器内在液体稀释剂中聚合烯烃以生产包含正常固体聚合物粒子的液体淤浆，使该聚合物在沉降腿中沉降，周期性开启位于沉降腿末端的180°旋转产物取出阀以使粒子装料流出沉降腿，产物取出阀由气动双作用驱动器(actuator)操作，气动系统由包括气动控制阀的系统调节，其特征在于控制阀是V形球阀。
本发明还涉及V形球控制阀在调节气动双作用驱动器中的用途，该驱动器操作环流反应器沉降腿的180°旋转产物取出阀。
最后，本发明涉及一种环流反应器，该反应器包括沉降腿、位于沉降腿末端的180°旋转产物取出阀，该180°旋转产物取出阀由气动双作用驱动器操作，气动系统由包括气动控制阀的系统调节，其特征在于控制阀是V形球阀。
优选，控制阀是自动控制阀。
现在参考附图描述本发明：
图1是具有两个沉降腿和它们的控制系统的环流反应器的示意图。
图2是控制系统的示意图。
图3是沉降腿底部的示意图，显示产物取出阀和它的驱动机构。
图4是气动系统的示意图。
图5是电控制系统的示意图。
在图1所示的实施方案中，聚合在环流反应器10中进行。将单体和稀释剂分别通过管线14和16引入，并合并入管线13中，以及将催化剂通过管线17引入。连接到电机M的搅拌叶片(propeller)11循环混合物。当生产聚合物粒子时，它们在沉降腿22中累积。每个沉降腿均具有连接到导管20的产物取出阀(PTO阀或PTO)23。
现在参考图2，显示环流反应器10具有两个沉降腿22a和22b，每个具有由控制单元28控制的PTO阀(分别为23a和23b)。
图3显示沉降腿22的底部，具有将其连接到导管20的PTO阀23。该PTO阀是旋转阀，旋转由机构M控制。
沉降腿22的PTO阀23仅周期性开启，从而沉降腿22中存在的聚合物粒子可进入导管20。应当紧密控制PTO阀23的开启时间，以使沉降腿22中存在的基本所有粒子进入导管20，同时基本没有单体和稀释剂离开反应器10。
使用两种类型PTO阀。最通常依赖于阀移动部件的180°旋转，从而阀从关闭(0°)转变到开启(90°)然后关闭(180°)；在下一个循环期间，阀反向旋转。也使用具有90°旋转的阀，从而移动部件从关闭(0°)转变到开启(90°)然后反向到关闭(0°)。本发明提供用于第一类型PTO阀的改进控制系统。
PTO阀通常由气动驱动。图4a显示每个PTO阀23具有双作用气动驱动器40，该驱动器控制它转动的速率。在180°旋转的情况下，在它直接控制它开启的时间的意义上，PTO转动的速率是特别重要的。
送到双作用气动驱动器40的空气流由双向系统45导引，该系统由螺线管驱动。图4b显示系统45的一部分，其中将来自导管50的空气通过导管42送入驱动器40，通过导管41返回和通过导管51离开。图4c显示系统45的另一部分，其中将来自导管50的空气通过导管41送入驱动器40，通过导管42返回和通过导管52离开。
总是使用控制阀61和62通过手动调节空气出口流控制气动PTO阀。在PTO阀23中的球在每个方向以不同速度转动的情况下，提供对于每个阀61和62的单独控制。
现在令人惊奇地发现通过使用自动控制阀61和62，使PTO阀23的控制得到改善。在优选的实施方案中，使用V形球控制阀。这样的阀使用缺口球部分(segment)的旋转来进行节流，该缺口球部分的形状使得它允许同时具有小开口的气流的非常精确控制，以及当需要时具有完全孔开口。作为V形球阀的例子，可以引用Worcester V-流动控制阀类型V44-66UMPTN90。
由于考虑到驱动器40中空气量相对小，到目前为止测试的所有控制阀不提供空气流动的精确控制，因此，发现适当的控制阀61和62不是显而易见的。更重要地，反应器10的操作更稳定不是显而易见的。
自动控制阀的使用提供关于PTO阀更好可靠性的几个优点。实际上，PTO阀的经常操作(例如每15-90秒)，导致该阀的磨损，之后其操作更缓慢。此效应立即由驱动器所需的空气量的自动增加补偿。对驱动器所需的空气量的自动控制避免PTO阀总是(get stuck in)在开启位置。与手动控制阀相比，自动控制阀的使用还使进入驱动器的空气量得到更精确控制。当使用手动控制阀时，总是存在如下危险：当降低进入驱动器的空气量时，PTO阀最终阻滞(get blocked in)在开启位置，导致反应器的减压。当需要该反应器的PTO阀的长开启时间时，这可在双环流系统的第一反应器中出现。
自动控制阀和180°旋转PTO阀的使用使得能够良好地控制该PTO阀的开启时间。这不能由相同的方式通过使用90°旋转PTO阀达到。
也已经发现必须将导管51和52的内体积降低到不产生对空气流的限制的最大可能值。导管51和52的直径为1.27cm(1/2英寸)到2.54cm(1英寸)，优选该导管的直径为约1.9cm(3/4英寸)。导管51和52的长度小于150cm，优选小于100cm。在最优选的实施方案中，导管51和52的直径为约1.9cm(3/4英寸)且在系统45到自动控制阀61和62之间的长度为约20cm。
现在参考图5，显示控制机构的优选实施方案。PTO阀23具有位于双驱动驱动器(double actuating actuator)中的传感器71和72，它指示阀23的位置。将来自传感器71和72的信息分别通过变送器73和电缆74及75送到计算机76以确定PTO阀的旋转时间。将PTO阀的旋转时间送到旋转控制器79，它也从操作者接收PTO阀的旋转时间81的设定值。依赖于在工作PTO阀的旋转时间和由操作者输入的所需旋转时间之间的差值，将信号82送到受控V形球阀，当旋转时间慢于操作者的设定值时，V形球阀的开启在每个循环增加1％，或当旋转时间快于操作者的设定时间时，每个循环降低1％。
PTO阀的旋转时间的设定值可以由操作者手动调节或由系统控制为在反应器每次开启时反应器压降的函数。
实施例和对比例
环流反应器装配有根据本发明的系统。该环流反应器具有如下特性：
-标称容量：5.5吨/小时
-容积：19m3
-沉降腿的数目：4
-沉降腿的尺寸：20.3cm
-闪蒸管线的尺寸：7.6cm
-PTO阀的尺寸：5cm
PTO阀23的双作用驱动器40每个均具有根据图4的控制系统。导管41和42具有1.27cm(1/2英寸)直径和3m长度。自动控制阀61和62是Cv为8、由1.9cm(3/4英寸)直径和20cm长度的导管连接到系统45的Worcester V-流动控制阀类型V44-66UMPTN90。
根据反应器中测量的压力的变化，测量反应器的操作稳定性。反应器操作非常稳定。实际上，当与装配手动控制类型的控制阀61和62的对比反应器的那些相比时，该变化低25％，对比反应器的其它特性与实施例的那些相同。此外，在对比反应器中，每个沉降腿的容量(capacity)低10％。
Claims (6)
1.一种聚合方法，包括在环流反应器内在液体稀释剂中聚合烯烃以生产包含正常固体聚合物粒子的液体淤浆，使该聚合物在沉降腿中沉降，周期性开启位于沉降腿末端的180°旋转产物取出阀以使粒子装料流出该沉降腿，该产物取出阀由气动双作用驱动器操作，该气动系统由包括气动控制阀的系统调节，其特征在于该控制阀是V形球阀。
2.权利要求1的方法，其中该控制阀是自动控制阀。
3.V形球控制阀在调节气动双作用驱动器中的用途，该驱动器操作环流反应器沉降腿的180°旋转产物取出阀。
4.根据权利要求3的用途，其中该控制阀是自动控制阀。
5.一种环流反应器，包括沉降腿、位于沉降腿末端的180°旋转产物取出阀，该180°旋转产物取出阀由气动双作用驱动器操作，该气动系统由包括气动控制阀的系统调节，其特征在于该控制阀是V形球阀。
6.根据权利要求5的环流反应器，其中该控制阀是自动控制阀。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP04100577.8 | 2004-02-13 | ||
| EP04100577A EP1563904A1 (en) | 2004-02-13 | 2004-02-13 | Method and apparatus for controlling the recovery of solid polyolefin from a continuous reaction zone |
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| CN1917951A true CN1917951A (zh) | 2007-02-21 |
| CN100421779C CN100421779C (zh) | 2008-10-01 |
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| US (1) | US8026322B2 (zh) |
| EP (2) | EP1563904A1 (zh) |
| JP (1) | JP5049015B2 (zh) |
| KR (1) | KR101210699B1 (zh) |
| CN (1) | CN100421779C (zh) |
| AT (1) | ATE329686T1 (zh) |
| DE (1) | DE602005000020T2 (zh) |
| DK (1) | DK1596981T3 (zh) |
| EA (1) | EA010471B1 (zh) |
| ES (1) | ES2265640T3 (zh) |
| PT (1) | PT1596981E (zh) |
| WO (1) | WO2005079972A1 (zh) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101864017B (zh) * | 2009-04-15 | 2012-05-30 | 中国石油天然气股份有限公司 | 一种丁二烯聚合反应自动控制方法 |
| CN101842398B (zh) * | 2007-11-05 | 2012-10-31 | 道达尔石油化学产品研究弗吕公司 | 使从一个反应器向另一反应器输送聚合物产物时的堵塞减少的方法 |
| CN114555223A (zh) * | 2020-09-22 | 2022-05-27 | 株式会社Lg化学 | 用于制备低聚物的设备 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3293000A (en) * | 1962-10-05 | 1966-12-20 | Phillips Petroleum Co | Withdrawal of solids from a flowing stream comprising a slurry of same |
| US3374211A (en) * | 1964-07-27 | 1968-03-19 | Phillips Petroleum Co | Solids recovery from a flowing stream |
| JP3220576B2 (ja) * | 1993-08-03 | 2001-10-22 | 信越化学工業株式会社 | 重合装置 |
| US5455314A (en) * | 1994-07-27 | 1995-10-03 | Phillips Petroleum Company | Method for controlling removal of polymerization reaction effluent |
| CN2314202Y (zh) * | 1997-12-12 | 1999-04-14 | 杭唯生 | 位移式阀门－旋转式阀门转换装置 |
| EP1195388A1 (en) * | 2000-10-04 | 2002-04-10 | ATOFINA Research | Process for producing bimodal polyethylene resins |
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2004
- 2004-02-13 EP EP04100577A patent/EP1563904A1/en not_active Withdrawn
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2005
- 2005-02-09 DE DE602005000020T patent/DE602005000020T2/de active Active
- 2005-02-09 JP JP2006552619A patent/JP5049015B2/ja not_active Expired - Fee Related
- 2005-02-09 CN CNB200580004871XA patent/CN100421779C/zh not_active Expired - Fee Related
- 2005-02-09 DK DK05707983T patent/DK1596981T3/da active
- 2005-02-09 EP EP05707983A patent/EP1596981B1/en not_active Not-in-force
- 2005-02-09 AT AT05707983T patent/ATE329686T1/de active
- 2005-02-09 WO PCT/EP2005/050566 patent/WO2005079972A1/en active Application Filing
- 2005-02-09 EA EA200601483A patent/EA010471B1/ru not_active IP Right Cessation
- 2005-02-09 ES ES05707983T patent/ES2265640T3/es active Active
- 2005-02-09 US US10/589,306 patent/US8026322B2/en not_active Expired - Fee Related
- 2005-02-09 PT PT05707983T patent/PT1596981E/pt unknown
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101842398B (zh) * | 2007-11-05 | 2012-10-31 | 道达尔石油化学产品研究弗吕公司 | 使从一个反应器向另一反应器输送聚合物产物时的堵塞减少的方法 |
| CN101864017B (zh) * | 2009-04-15 | 2012-05-30 | 中国石油天然气股份有限公司 | 一种丁二烯聚合反应自动控制方法 |
| CN114555223A (zh) * | 2020-09-22 | 2022-05-27 | 株式会社Lg化学 | 用于制备低聚物的设备 |
| US11904291B2 (en) | 2020-09-22 | 2024-02-20 | Lg Chem, Ltd. | Apparatus for preparing oligomer |
Also Published As
| Publication number | Publication date |
|---|---|
| DE602005000020D1 (de) | 2006-07-27 |
| EP1596981A1 (en) | 2005-11-23 |
| EA010471B1 (ru) | 2008-10-30 |
| CN100421779C (zh) | 2008-10-01 |
| WO2005079972A1 (en) | 2005-09-01 |
| JP5049015B2 (ja) | 2012-10-17 |
| ATE329686T1 (de) | 2006-07-15 |
| DK1596981T3 (da) | 2006-10-09 |
| EP1563904A1 (en) | 2005-08-17 |
| JP2007522316A (ja) | 2007-08-09 |
| US20070282082A1 (en) | 2007-12-06 |
| KR20060126592A (ko) | 2006-12-07 |
| US8026322B2 (en) | 2011-09-27 |
| EA200601483A1 (ru) | 2007-02-27 |
| EP1596981B1 (en) | 2006-06-14 |
| DE602005000020T2 (de) | 2006-11-30 |
| KR101210699B1 (ko) | 2012-12-10 |
| PT1596981E (pt) | 2007-07-23 |
| ES2265640T3 (es) | 2007-02-16 |
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