Questions tagged [chemical-engineering]

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

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84 views

Contradictory result for mass balance

I solved this problem by doing a mass balance for the mixing chamber and an energy balance for the water heater and the mixing chamber as follows: $\dot{m}_{\text{mix}}=\dot{m}_{\text{Tank}}+\dot{m}_{...
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40 views

Polyurethane with microbial resistance properties

I'm looking for a polyurethane with microbial resistance. Doing some research I found two commercial types: DESMOPAN 9392A and DESMOPAN 2792A. Both are manufactured under GMP conditions and limited ...
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1answer
2k views

Can current passing through a wire potentially ignite gasoline? If not, why?

I am doing some restauration on my old Vespa and since the fuel indicator doesn't work, I took the fuel gauge system out of the tank and tried to understand how it works to repair it. Apparently, 3 ...
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2answers
551 views

How can I vaporize metals?

What are some common ways that I can vaporize Metals into a vacuum chamber? How can I keep these Metals in a gaseous state?
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1answer
37 views

Can chemical vapor deposition chambers be used to lay down thick layers of metal?

Can CVD Chambers be used to lay down thick (~1 mm) layers of metal?
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29 views

How can I convert volume as a function of time to mass or mole as a function of time for a dissolving drug particle?

I have been given a spherical drug particle that dissolves by surface erosion into the bloodstream. The rate of dissolution is proportional to the exposed surface area of the particle. I have to model ...
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1answer
817 views

Entropy change in a throttling process

In an adiabatic throttling process of ideal gas: I understand that mathematically lost work is given by Tsurr * entropy generated. But intuitively I can't understand if there is not heat exchange ...
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1answer
116 views

Modelling gas desorption from a still solution (e.g. a beer)

The common way to model or estimate gas (e.g. CO2) desorption rate from a liquid solution is by using an equation similar to this one $J_{CO_2} = -k_L a(H·C^G_{CO_2} - C^L_{CO_2})$ where $J_{CO_2}$ ...
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55 views

what classes should I take so that I can perform research into finding catalysts to split water into oxygen and hydrogen? [closed]

I am a freshman student and I am very interested in using solar energy to break water into hydrogen and oxygen. So, I want to know which areas are important in this regard..
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37 views

If I replace a flow orifice with a Coriolis flow meter of the same size do I need to worry about pressure drop with the new Coriolis meter?

I have a 3 inch line with a 1.5 inch flow orifice. If I take out the flow orifice and put in a 1.5 inch coriolis meter will the pressure drop be the same or better with the new coriolis meter than ...
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0answers
21 views

How widely used are ethylene receptor inhibitors in fruit packaging & shipping?

Ethylene works as a gaseous "aging" hormone for many fruits. There are lots of papers on ethylene receptor inhibitors (e.g. 1-MCP) to delay this process. I also found out that 1-MCP has been EPA-...
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2answers
780 views

Can Fortran 90 be used with Aspen Plus, or only Fortran 77?

I am attempting to write a user model in Fortran that can be connected to the Aspen Plus process simulator. Can Fortran 90 be used, or does Aspen only work with the older Fortran 77? I have checked ...
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1answer
87 views

Designing a horizontal pressure vessel

The question reads Design a horizontal pressure vessel with hemispherical head supported by saddle support and fitted with 2 nozzles welded to the head. It's used for storing and delivering fuel ...
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16 views

Distribution of turbulent energy dissipation in a stirred tank

Is detailed experimental information on the distribution of energy dissipation in a stirred tank(45o Pitch blade) available? I require this variation in all directions in a standard stirred tank ...
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0answers
22 views

How to quantify adulteration of urea and hydrogen per oxide in cow milk? [closed]

I am very much new in this field and trying to get some information on adulteration of cow milk. I have searched and saw that mostly urea and hydrogen per oxide are mixed with cow milk. I found that ...
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1answer
55 views

How to identify the time delay of manipulated variables which are important to the final quality of polymer product

In a polymer production process, there are a lot of manipulated variables(MV) such as temperature ,pressure , or level of reactor that affect the quality of my polymer product. However, it usually ...
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1answer
96 views

What about the natural convection heat transfer coefficient (*h*) at low Delta-T?

In a system I am modeling for personal research, I have a sphere (S) submerged in air (A), initially at the same temperature Ts = Ta. Then the temperature of air is slowly increased (or decreased), ...
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1answer
72 views

Thai Cave Rescue-Using trace gas detection to locate chimney entrances [closed]

One of the potential ideas that was suggested for rescuing the Thai soccer team trapped in the cave is to locate a "chimney" or secondary entrance to the chamber where the team is trapped. However, ...
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0answers
20 views

Phase Change Materials Charge and Discharge [closed]

Is there a way to approximate the charge and discharge time of a PCM. I understand that this is a transient process as a material melts from the outside in, but I was wondering it there a means of ...
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1answer
77 views

specific energy consumption vs plant load [closed]

often we encounter examples where specific energy consumption of a plant(i.e energy consumption/production rate) improves just by increasing the thoroughput or by "pushing" more load through a plant. ...
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1answer
93 views

What is a 'swept path' in a valve system?

I have been doing some research on valve systems for sample analyzers. In many of the valve systems' product documentation they refer to a flow path as 'fully swept'. From the context I can conclude ...
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1answer
622 views

How important is an ABET-accredited Engineering Degree in the EU (like Germany) or other countries that is not in North America?

I have an option to either attend Middle East Technical University - North Cyprus Campus (non-ABET accredited) or Mapua University (ABET accredited) in the Philippines to study Chemical Engineering as ...
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0answers
23 views

Adsorption - what models are used for dry scrubbing?

For scrubbing with activated carbon, air is generally brought through a dry adsorption media, where the contaminant is adsorbed onto the media. I would like to know what mathematical model is used ...
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1answer
28 views

Determination of solid bed fluidisation

How would one determine if a fluidised bed (with liquid flow) is determined to be a stable fluidised bed, which subsequently doesn't form a plug or bed at the top of a column (bounded by frits), when ...
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31 views

How to apply the permeability value found from an experiment?

I have done a permeability experiment on LDPE in the presence of air using a 25mm circular specimen. At 30'C, the permeability was found to be 1.846 barrer. Now I am trying to apply this permeability ...
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2answers
88 views

How to derive volumetric flow rate?

Given the mass flow rate in lbs/min, the specific gravity of a substance, the temperature in F, and the density in lbs/ft^3, what is the equation to derive the volumetric flow in Gallons/Min?
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108 views

Eletrolysis of water

The electrolyser used in the process at 25°C and 10.0 bar exhibits a global yield of 82% with a potential of 1.481 V. Determine the electrical energy that can be electrolyzed by year in order to get ...
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288 views

Chemical Engineering Question using Raoult's Law

A liquid mixture containing 35.0 mole% acetone and 65.0 mole% water is to be partially vaporized to produce a vapor that is 70.0 mole% acetone and a residual liquid that is 30.0 mole% acetone. (a) ...
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1answer
60 views

Question on Phase Change Materials

I am looking at Phase Change Materials as a building fabric option and from reading up on the topic theres something I don’t understand. Hopefully somebody can help explain. I read that when a ...
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1answer
324 views

Will natural gas or propane generators also run off of methane?

I'm looking at building a sustainable energy project that will convert biogas (methane) into electricity. I haven't found any biogas or methane electric generators for sale. It seems that there are ...
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2answers
69 views

Meaning of kWh/tcoal

Can someone explain what this sentence means? "The mean power produced in this plant is 100 MW with a mean productivity of 5100 kWh/tcoal." Specifically what does 5100 kWh/tcoal and 100MW mean?
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17 views

What would make a composite chemical vapor deposition diamond hard to make?

I am exploring whether a diamond based capacitor could be made for powering a drone. From my initial research, it has the right material properties (thermal conductivity, strength to weight ratio, ...
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1answer
45 views

Elution from an Ion Exchange Column

I am using concentrated NaCl(10%) to elute Cobalt (II) ions from a cationic exchange column. How would I determine the volumetric flowrate of regenerant needed to completely elute the cobalt ions from ...
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1answer
138 views

Problems regarding aspen simulation

I am trying to model water gas shift reactor on Aspen using an Rgibbs reactor. Unfortunately whenever i pass the stream into the reactor(HTS) the amount of CO and H2 both are increasing and C in the ...
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1answer
83 views

Up flow vs down flow through a porous fixed bed

How do I analyse for, or what do I need to consider, when comparing gravity-opposed vs gravity assisted flow in a tube containing a porous bed that partially shrinks (through partial mass loss) over a ...
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1answer
335 views

Von Karman mixing length $l=k \frac{du/dy}{d^2u/dy^2}$

In a fully developed turbulent flow of an in-compressible fluid inside a pipe of radius $R$, velocity at the center is $U_m$. If we define $U^*=\sqrt{\tau_0/\rho}$, where $\tau_0$ is the wall shear ...
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1answer
545 views

Material balance without chemical reactions

This is a practice question that I am trying. I am a student learning about material balance- I am trying to find the mass composition of stream D. The one written in pencil is the values that I ...
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1answer
54 views

Can CO2 produce energy to drive a bot

I am planning to design an autonomous bot that takes power from a chemical reaction.i was thinking if CO2 produced via some chemical reaction can drive small wheels so as to generate electricity which ...
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0answers
65 views

position of feed stream discharge in the fractionating column

In the book 'Chemical Engineering' by Coulson and Richardson (Volume 2, 5th edition), in the section 'Fractionating Column')(page-560), it's said that,'The feed stream is introduced on some ...
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2answers
412 views

Why lead was chosen as the metal for lead-acid batteries?

I was always curious why lead was chosen as the default for metal acid batteries. This article describes lead-acid battery operation and there are plenty of resources like this on how lead acid ...
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1answer
112 views

Convolution with RTD laminar flow

I have laminar flow in a tube. Consider the tube to be 0.2 m long and with an average velocity of 0.05 m/s. The analytical expression for my transfer function is: $E(t)= \frac{\tau^2}{2*t^3}$ for $t$>=...
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2answers
143 views

Failure of N.R.T.L method to model Phenol / Methylcyclohexane / Toluene system in AspenPlus. Why?

I have an extractive distillation column set up in AspenPlus. Methylcyclohexane (MCH) is expected to come out from the top (in the distillate stream) and the bottoms stream is mostly Toluene/Phenol, ...
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1answer
77 views

Concept on material balance

I am a chemical engineering student learning about material balance, so the problem below will not be a ‘real’ one , but just an exercise for me to understand better. This system below is not a ...
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1answer
1k views

Draft of a fired heater

I’m a chemical engineer learning about fired heaters. I’m learning about draft and I picked this out of a textbook- For example - Drafts: Just above the burners = $-0.3\text{in H}_2\text{O}$ At the ...
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3answers
86 views

Metering pump that is either computer compatible or microcontroller compatible?

I'd like to write something in Python to automate and maintain a specific dosing formula for a couple of our processes. We need a dosing pump that either has a USB port that can interact with a ...
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0answers
73 views

Design review needed for novel ion trap air scrubber / purifier concept [closed]

As a side kick I came up w/ a wet scrubber / air purifier design using trapped charged water droplets. I'm thinking about building a proof of concept but would like the community's feedback. ...
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1answer
731 views

Process fluid flow in a fired heater

While I’m studying about a fired heater (furnace) in chemical engineering , I learnt that the process fluids enters from the convection section and leaves at the radiant section of the furnace. Why ...
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2answers
87 views

How can i obtain heat from conductive paint using dc current

I have been searching for a material that can heat up when we supply dc current. Many give me a suggestion for use nichrome wires. Or carbon rich paste paint(conductive paint). I want a sheet of such ...
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1answer
821 views

Mass balance of a recycle stream

I'm a chemical engineer student and I have just started to learn about mass balance without reaction. This is my problem - I want to find Out the mass composition and mass flowrate of stream Y (...
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1answer
1k views

Calculate the radius of iridium atom, given that Ir has an FFC crystal structure, a density of 22.4 g/cm3 and atomic weight of 192.2g/mol [closed]

Calculate the radius of iridium atom, given that Ir has an FFC crystal structure, a density of $22.4\text{g/cm}^3$. and atomic weight of $192.2\text{g/mol}$. Everyone whom I asked this question ...