w********h 发帖数: 12367 | 1 寄信人: ukliaoliao (ll) [WWW MAIL]
标 题: need suggestion
实验需要一些颗粒,放在流化床中研究其运动性质。最好的材料是玻璃颗粒,glass
beads,但玻璃密度太大,2500kg/m3,所以就考虑用空心玻璃颗粒,但颗粒直径不能太小
,要大于50微米吧,找了半天没有结果。现在在考虑是否可以用polymer颗粒,因为polym
er比较容易得到尺寸一致的颗粒,而且密度也比玻璃小的多,但第一,不知道是不是透明
或半透明,或白色的,因为要用激光测量技术,要求颗粒具备一定的光学性能refractive
index,第二有机物颗粒好像容易带静电,尤其在流化床中,如何消除静电又是新问题。
有什么polymer particles推荐,如何消除静电等,亦或烦请转贴至高分子俱乐部,谢谢
。 | b**s 发帖数: 589 | 2 I used to work on the subject of gas phase fluidized bed olefin
polymerization, so I think polymer颗粒 fludization is not a big deal. you can
easily do it.
Try Polystyrene (because it can be polymerized directly into particle
form), But I think all the polymers are 透明或半透明,或白色的 if they are
pure.
静电, in my opion , is not a problem if you use steel fluildized bed
小
,要大于50微米吧,找了半天没有结果。现在在考虑是否可以用polymer颗粒,因为polym
明
或半透明,或白色的,因为要用激光测量技术,要求颗粒具备一定的光学性能refractive
。
谢
【在 w********h 的大作中提到】 : 寄信人: ukliaoliao (ll) [WWW MAIL] : 标 题: need suggestion : 实验需要一些颗粒,放在流化床中研究其运动性质。最好的材料是玻璃颗粒,glass : beads,但玻璃密度太大,2500kg/m3,所以就考虑用空心玻璃颗粒,但颗粒直径不能太小 : ,要大于50微米吧,找了半天没有结果。现在在考虑是否可以用polymer颗粒,因为polym : er比较容易得到尺寸一致的颗粒,而且密度也比玻璃小的多,但第一,不知道是不是透明 : 或半透明,或白色的,因为要用激光测量技术,要求颗粒具备一定的光学性能refractive : index,第二有机物颗粒好像容易带静电,尤其在流化床中,如何消除静电又是新问题。 : 有什么polymer particles推荐,如何消除静电等,亦或烦请转贴至高分子俱乐部,谢谢 : 。
| w********h 发帖数: 12367 | 3 Ghasem NM
Effect of polymer growth rate and diffusion resistance on the behavior of
industrial polyethylene fluidized bed reactor
CHEM ENG TECHNOL 24: (10) 1049-1057 OCT 2001
Kim JY, Choi KY
Modeling of particle segregation phenomena in a gas phase fluidized bed olefin
polymerization reactor
CHEM ENG SCI 56: (13) 4069-4083 JUL 2001
Fernandes FAN, Lona LMF
Fluidized-bed reactor modeling for polyethylene production
J APPL POLYM SCI 81: (2) 321-332 JUL 11 2001
Fernandes FAN, Lona LMF
Heterogeneous
【在 w********h 的大作中提到】 : 寄信人: ukliaoliao (ll) [WWW MAIL] : 标 题: need suggestion : 实验需要一些颗粒,放在流化床中研究其运动性质。最好的材料是玻璃颗粒,glass : beads,但玻璃密度太大,2500kg/m3,所以就考虑用空心玻璃颗粒,但颗粒直径不能太小 : ,要大于50微米吧,找了半天没有结果。现在在考虑是否可以用polymer颗粒,因为polym : er比较容易得到尺寸一致的颗粒,而且密度也比玻璃小的多,但第一,不知道是不是透明 : 或半透明,或白色的,因为要用激光测量技术,要求颗粒具备一定的光学性能refractive : index,第二有机物颗粒好像容易带静电,尤其在流化床中,如何消除静电又是新问题。 : 有什么polymer particles推荐,如何消除静电等,亦或烦请转贴至高分子俱乐部,谢谢 : 。
| u********o 发帖数: 258 | 4 thanks a lot for ur suggetion and experience!
I am using a 2-D glass fluidized bed, maybe I will change two narrow walls to
be metal material to eliminate some chages? Because I will use laser to
measure the particle inside the bed, so the main sides of the bed have to be
glass.
I am interesting in Geldart A group particles (refer to
http://www.erpt.org/012Q/rhod-04.htm) because they are ideal for fluidization,
for some polymer beads they are too large(mm).
anyway, i think there should be some p
【在 b**s 的大作中提到】 : I used to work on the subject of gas phase fluidized bed olefin : polymerization, so I think polymer颗粒 fludization is not a big deal. you can : easily do it. : Try Polystyrene (because it can be polymerized directly into particle : form), But I think all the polymers are 透明或半透明,或白色的 if they are : pure. : 静电, in my opion , is not a problem if you use steel fluildized bed : : 小 : ,要大于50微米吧,找了半天没有结果。现在在考虑是否可以用polymer颗粒,因为polym
| u********o 发帖数: 258 | 5 thanks you very much, wonder. maybe i didn't explain my problem clearly.
I don't want to study polymer reaction, but I am interested in using polymer
as filled material in fluidized bed, currently i focus on cold-model experiment
I used Web of Science(ISI) and searched almost the same results as u
recommended, most paper discuss about polymerization, in fact this is not my
field, hehe.
anyway, you gave me many good hints, they are useful.I will have a quick look
of these papers, there should be
【在 w********h 的大作中提到】 : Ghasem NM : Effect of polymer growth rate and diffusion resistance on the behavior of : industrial polyethylene fluidized bed reactor : CHEM ENG TECHNOL 24: (10) 1049-1057 OCT 2001 : Kim JY, Choi KY : Modeling of particle segregation phenomena in a gas phase fluidized bed olefin : polymerization reactor : CHEM ENG SCI 56: (13) 4069-4083 JUL 2001 : Fernandes FAN, Lona LMF : Fluidized-bed reactor modeling for polyethylene production
| b**s 发帖数: 589 | 6 Which is good Refractive Index?
I used to use laser to measure the PE particle size, It's fine.
to
fluidization,
800-2000kg
can
能太
,要大于50微米吧,找了半天没有结果。现在在考虑是否可以用polymer颗粒,因为polym
是透
或半透明,或白色的,因为要用激光测量技术,要求颗粒具备一定的光学性能refractive
问题
,谢
【在 u********o 的大作中提到】 : thanks a lot for ur suggetion and experience! : I am using a 2-D glass fluidized bed, maybe I will change two narrow walls to : be metal material to eliminate some chages? Because I will use laser to : measure the particle inside the bed, so the main sides of the bed have to be : glass. : I am interesting in Geldart A group particles (refer to : http://www.erpt.org/012Q/rhod-04.htm) because they are ideal for fluidization, : for some polymer beads they are too large(mm). : anyway, i think there should be some p
| u********o 发帖数: 258 | 7 like glass, say 1.5 or near
btw, should we consider adsorption when we use laser to shine
the sample? when I used FCC catalysts, the adsorption is so
strong that there is no light pass through the 8mm fluidized bed,
it is terrbile because I can get nothing from the transmission geometry,
the detector(PMT) only receive few signals from backscattering.
【在 b**s 的大作中提到】 : Which is good Refractive Index? : I used to use laser to measure the PE particle size, It's fine. : : to : fluidization, : 800-2000kg : can : 能太 : ,要大于50微米吧,找了半天没有结果。现在在考虑是否可以用polymer颗粒,因为polym : 是透
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