Questions tagged [chemical-engineering]

Use this tag for questions within the problem domain of chemical engineering.

Filter by
Sorted by
Tagged with
1
vote
0answers
35 views

Corrosion of a galvanic couple made with silver and gold

If a bangle is made out of gold and silver, connected with each-other would there be a corrosion happening? If so can it be explained using the galvanic series? Also do those metals undergo oxidation ...
2
votes
0answers
131 views

What are the best materials to use for producing drinking water from the Air?

There are several companies producing equipment that produce drinking water from the air. They use dessicants, hygroscopic brine, or deliquescent salts, to adsorb water from atmospheric humidity. ...
3
votes
1answer
2k views

Filter Area for given flow rate

Background For a washing process after a crystallization we want to know how much filter area we would need and if said area will work for our fixed volume flow. Calculation $\dot{V_F}$ has a ...
12
votes
3answers
452 views

Exploiting fluid dynamics for the optimal design for gas mixing in a furnace

Background This is the standard design for a thermal furnace used in the Clauss process, which converts H2S to SO2. The main problem with the furnace is that gas mixing is rather poor and results in ...
10
votes
1answer
651 views

Steam sterilization of whey in a bioreactor

I'm trying to design a bioreactor to produce citric acid with whey and Aspergillus Niger. The first step in the process would be to put whey into the reactor with some dextrose (approx. 10%). Then, ...
10
votes
1answer
1k views

What liquid crystals are used most frequently in displays?

Is there a specific chemical that is used frequently in the production of liquid crystal displays? During my internet research so far, it seems as if the specific chemical composition of the liquid ...
4
votes
2answers
454 views

What relationship is there between mass of water vapour produced in combustion and the energy lost through producing this water?

I am performing a number of simple heat transfer experiments with the application of a magnetic field around the fuel line to evaluate the effects. To attempt to quantify some of the heat losses in ...
7
votes
2answers
1k views

What are the advantages of chemical oxygen generation over compressed tank storage?

Chemical oxygen generation (COG) is used in commercial airliners to supply emergency oxygen to passengers and crew if the plane is depressurized. Weight for weight it produces far more oxygen than ...
3
votes
1answer
321 views

Ratio between heat transfer coefficient and thermal conductivity

Consider the Robin boundary condition for the diffusion/heat equation $\mathrm{u_t=a(t)u_{xx}+f(x,t)}$: $$\mathrm{-k(t)u_x(0,t)=h(t)u(0,t)}$$ or $$\mathrm{u_x(0,t)+\frac{h(t)}{k(t)}u(0,t)=0}$$ ...
8
votes
1answer
482 views

Degassing silicone solution with negative pressure

I am planning to use polydimethylsiloxane (PDMS) to create a phantom for mimicking tissue for imaging. For this, I plan on using SYLGARD® 184, which is a viscous liquid. When adding other components ...
4
votes
1answer
517 views

Which component of vehicle tailpipe emissions has the greatest social cost?

Emissions Emissions from vehicles have an associated social cost for everyone. We hear a lot about CO2, but CO2 is not the only thing that comes out of a tailpipe. From Wikipedia, emissions ...
4
votes
1answer
434 views

How to separate isotopes of Plutonium?

In case of Uranium, things are lot easier, because $UF_6$ is gaseous from around 60 $\,^{\circ}\mathrm{C}$. I know, that in most cases, plutonium isotope separation is not needed, because there is no ...
3
votes
0answers
532 views

What is the longest self support length a chain one molecule wide can be?

Self-support length is the maximum length of a vertical column of the material (assuming a fixed cross-section) that could suspend its own weight when supported only at the top this is an important ...
4
votes
2answers
193 views

Understanding redundant pharmaceutical packaging

I ran across an interesting combination of packaging for some medicine the other day. The medicine in question was a prescription migraine medication. The exterior, cardboard package that it came in ...
5
votes
4answers
1k views

Why do rechargeable Lithium Ion & Lithium Polymer batteries explode or catch fire?

There are many Lithium Ion and Lithium Polymer rechargeable battery related accidents. Are some of these accidents are battery design related? Are some of them misuse of rechargeable batteries. What ...
13
votes
1answer
789 views

What causes rechargeable batteries to age? What can be done to extend life of these batteries?

These days most of modern electronics use rechargeable batteries as a power source. Also, these days most modern rechargeable batteries are Lithium Ion or Lithium Polymer based. Like any other devices,...
5
votes
1answer
476 views

Baffle vs Bottom Temperature Measurement/Control

In an industrial jacketed reactor, we have two temperature probes: one on a baffle the extends down about to the 50% fill line one built into reactor, very close to the bottom valve. When is it ...
14
votes
1answer
579 views

What are some cost-effective metal substances that can wet glass?

A highly desirable property of metals like gallium and indium is that they are able to wet glass. Normally, as metals, they wouldn't be able to form an airtight seal when in contact with glass. But ...

1 2 3 4 5
6