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
|
|
