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Hello All: I have a Glass vacuum trap that is immersed in a liquid nitrogen dewar. I am interested in the vapors that are condensed inside the trap. This trap is in line with a vacuum pump that generates 1.5 torr of vacuum. The problem is I am not able to disconnect the body of the trap from...

UTChemE, Try koch membranes, MTR.. We have earlier bought TFC membrane that we used for our RO project from KOCH.. Good luck, RW

Hello: Can anyone suggest where I could buy cold trap that can be used for pervaporation (lab scale) unit. I will be using it for condensing vapors of ethanol/water. Thanks in advance RW

Dear All: I am working on a bench scale pervaporation unit, directed towards separating water from ethanol using a polymer dehydration membrane. As of now, I am having extreme difficulty in collecting all the permeate vapors and condensing it. Although my experimental time is long enough...

PVmem, Thanks for the explaination. In my system, I am having a moderate upstream pressure (<25psi) that varies with the flow rate. I see flux value increasing with increase in flow rate i.e, inturn the upstream pressure. At that point i was thinking if this could be a pressure driven...

Dear Katmar and 25362, thanks for the help... Regards and good luck RW

Dear 25362 Again thanks for the link, its exactly what I wanted. But still, I would like to ask your suggestion, since a website cannot be quoted as a reference, is there any standard data book that could provide this kind of data? Regards, RW

Dear All: 1) Does upstream pressure have any effect on pervaporation flux? 2) Will higher upstream pressure create higher driving force ? Please let me know your suggestions. Thanks RW

Dear Katmar, Thanks for your valuable suggestion. It did help me but its a commercial software that i have to buy. 1) I am actually looking for some data reference book, like Perry in which the conversions are listed. 2) can you suggest any other method that can be developed on our own to...

hi I am in need of data for ethanol that relates concentration (% v/v) and density at various temperatures. I have looked into Chemical engineering hand book, they have the density data at wt%. If anyone can suggest any reference material to get density data for ethanol concentrations in % v/v...

Dear All: Thanks for your response. I apologize for not providing sufficient information. 1)I have a pervaporation unit from which I collect concentrated ethanol. This is a lab scale unit. 2)I use 90% v/v ethanol as my feed. The retentate that I collect is concentrated ethanol, which I would...

Hello: I have a process that generates ethanol concentration varying from (90 to 98 % v/v). I would like to recycle this i.e., to use it at lower concentrations such as 80,70 % v/v etc. Can any one suggest suitable procedure to achieve this such that the purity of ethanol is retained. My...

Hello, I have few questions related to pervaporation process. 1)Can pervaporation experiments be conducted at isothermal process? If so how? 2) I am using a polymeric membrane to separate water from alcohol at a temperature of 60C. But during the process of experiments the temperature rises...