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Questions tagged [chemical-engineering]

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

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12 views

N2O/Kerosene Rocket Fuel

I am interested in building a small liquid fuel rocket and I have decided to use nitrous oxide and kerosene as the oxidiser and fuel respectively. I would like to know if anyone has any advice ...
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1answer
71 views

Buying Liquid Oxygen in Small Quantities

I am trying to work out costs and order parts for a small liquid fuelled rocket I have designed. My oxidiser is liquid oxygen but I can’t seem to find anywhere to purchase it on the internet. Does ...
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1answer
16 views

Sieve trays used in Liquid liquid extraction tower instead of bubble cap and valve trays?

In an LLE operation pilot plant, i saw that sieve trays are used instead of bubble cap and valve trays... In LLE operation, they require good mixing, so i was shocked why bubble cap and valve trays ...
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25 views

Why is it better to filter off several smaller batches than one large batch in a batch filteration

Why is it better to filter off smaller batches than one large batch for wet cake filtration in a peeler centrifuge?
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1answer
17 views

On partial reboiler and total condenser in distillation column

Why is it that a total condenser and partial reboiler are used in a distillation column and it is not the other way around?
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1answer
21 views

Azeotropic Distillation - Am I interpreting this VLE diagram correctly?

I've been looking at ways to re-concentrate a formic acid-water binary mixture with the VLE diagram below. Am I correct in saying that to concentrate a solution of say , 40% formic acid by weight I ...
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21 views

In oxidising roasting why phosphorus can't oxidising?

In the sinter process of oxidising roasting, why phosphorus can't oxidising?
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16 views

At which stage can borate solutions be injected to metallurgical coke?

Borates are effective to increase CSR of metallurgical cokes so that can be added to the metallurgical coke in the process, which place is best for this belching process? Coke ovens? Coke ovens (...
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8 views

Tg and vitrification

If the particular reaction temperature is lower than the value of Tg at full conversion, Tg∞ = Tg(x = 1), a conversion will be reached where Tg(x) equals T(reaction temperature) and vitrification of ...
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1answer
28 views

chemical reaction engineeing

What is the definition of rate $(−ra)=−\frac{dCa}{dt}$ or $(−ra)=−1/V\frac{dNa}{dt}$ ? I think the general one is the second one and first one is for constant volume reaction system. Is the above ...
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18 views

Can we engineer detergent micelles to pick up Microplastics?

I'd like to know if I could get micelles to pick up microplastics in water. I read that microplastics are sometimes charged, so can we make the lyophobic end to pick up microplastics, so that they can ...
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1answer
25 views

How does reaction rate depends on concentrations in irreversible reactions?

Consider the following consecutive, second order, irreversible reactions are carried out in a batch reactor: A + S Yield(k1) X X + S yield (k2) Y One mole of A and two moles of S are initially ...
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27 views

How to produce aluminium powder by E. J. Hall method

I have watched videos on YouTube producing Aluminum powder by mechanical methods. Like this one. It uses Aluminum foil and coffee grinder: There are similar videos which use the same basic method but ...
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13 views

Difference between RK and SRK equations of state in molar volume calculations

I'm doing a simple paper for my postgrad course in Chem. Eng. In this study, I'm just comparing equations of state and the data found in PH diagrams. For Methane, at 263.15 K and 20000 kPa, the molar ...
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1answer
16 views

What do you think are the difficulties in tissue engineering of complex organs such as the heart and liver, as compared to skin?

What do you think are the difficulties in tissue engineering of complex organs such as the heart and liver, as compared to skin?
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17 views

How to calculate feasibility of %1 CSR increase of metallurgical coke?

We want to increase CSR (Coke Strenght After Reactivity) value of metallurgical coke by adding borate solutions on industrial scale. How to calculate feasibility of % 1 CSR increase of it for 1 ...
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1answer
22 views

Solving a linear mass balance equation in the form of Ax = 0 with variables in vector x

I have been tasked with solving a series of linear equations in the form of Ax = b, where b is the zero vector. Specifically, I have a matrix E which is 4x7 and a column vector r which is 7x1, as ...
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1answer
32 views

What is the effect of different ways to adding liquid materials into a mixing tank?

I am working with body wash products and there is a problem happening with the mixing process. I use a 5000-liter tank to mix all the liquid materials including water, surfactant and preservatives. ...
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18 views

Is it possible to reduce energy consumption of air separation unit by using single column rectification process?

Is it possible to reduce energy (Joule or KW) consumption of air separation unit by using single column rectification process instead of double column rectification? Is there any examples that this ...
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25 views

Is it possible to do purification of Sodium Sulphate and which companies do this? [duplicate]

If Sinter filter generates lots of Sodium Sulphate and then is there a way to make purification of this and which companies are already do this process?
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1answer
52 views

Why do Blast Furnace flue dust generates high rates of Zn (Zinc)?

The Blast Furnace flue dust contains high rates of Zn (Zinc). I'd like to know the reason behind this. The chemical reaction of Zn inside blast furnace dust. Why it's rates becoming high?
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1answer
18 views

How to use a specific list of components in a stream in ASPEN-HYSYS?

In HYSYS it is possible to create multiple lists of components using their proper fluid package to better calculate the properties of very different molecules. Here I defined two lists: List 1 List ...
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18 views

How can I confirm nL Volume Measurement for Pump and Sensor Calibration

I'm dispensing around 1uL of volume with 1% accuracy. Although I'm confident in my pump, I'd like to be able to routinely confirm that I'm getting the exact volume I'm requesting every time. How can ...
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16 views

How do I charge titanium dioxide particles submurged in black-dyed water in home?

My first thought was to charge the titanium dioxide particles by first charging a balloon by rubbing it on my hair and then touching the balloon to the titanium dioxide powder, but that would be ...
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1answer
39 views

Is there an industrial process that makes use of photosynthesis?

When I was in school, photosynthesis was taught as this amazing biological process that took light and water and turned carbon dioxide into oxygen and carbon. It was implied that this was limited to ...
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1answer
22 views

Best reactor for solubility-limited reaction?

I have a reaction where component X is required to react with formic acid producing a solid precipitate. The main problem is that component X has very low solubility in formic acid and the reaction ...
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1answer
31 views

Carefully attaching Pt-wire to mild/carbon steel surface

Problem: I have a near 100% Pt wire (25 AWG / D ≈ 0.45mm) that I would like to attatch to a cold rolled steel (E235 / EN 1.0308) surface. Assume this surface is flat. Goal: Keep wire attached to ...
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1answer
39 views

Does the plant transfer function of a system change with variations in the reference variable?

I am designing a PID controller for a system that requires several step changes in the reference variable (concentration of solute in a tank) over a set period of time. I can find the plant transfer ...
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20 views

Estimating rate of drying by comparing identical process with different ambient humidity

We have a drying process where we take a thin bread product and cool it in a room at 11 C and 90% relative humidity. The product comes in at 80 C and comes out at 22 C. There is air blowing across the ...
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1answer
63 views

Identify plant transfer function to design PID controller

I am trying to find the transfer function of a plant that contains numerous equipment including a heater, several tanks, pumps, membranes etc. I need to design 2 PID controllers: the first one to ...
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1answer
32 views

Custom User Models in Aspen Plus

I'm trying to simulate a purifier in Aspen Plus in a cryogenic system. This purifier is just meant to change the pressure of the outlet stream based on the inlet flow and pressure (we are using the ...
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1answer
22 views

Doubt regarding meta-stable and labile region of a supersaturated solution

I have read in a paper that the for formation of new crystals in a solution the energy released due to formation of solid from solution should be more than the energy needed to overcome solid-liquid ...
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12 views

Which version of the Kozeny-Carman equation is valid?

I am learning fluid mechanics, and I've come across the Kozeny-Carman equation for a packed bed in laminar flow conditions as: $$\frac{\Delta P}{L}=\frac{150\bar{v_0}\mu}{\phi^2D_p^2}\frac{(1-\...
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34 views

What type of pump is recommended for pumping gasoline/petrol in vapor phase?

I would really like to know your input, perhaps there are regulations on this that I'm not aware of that can help out regarding the overall safety of the process.
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22 views

Are there any books which show how to design electrical coil heat exchangers?

I need to design an electrically powered gas heater, but i need to do so in detail. I'm looking for a guide similar to the shell and tube heat exchanger design guide in coulson and richardson's ...
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1answer
31 views

What is the mechanism of adsorption-desorption on biochar obtained from slow pyrolysis/ torrefaction?

Biochar is a major by-product from pyrolysis along with bio-oil and it is considered an important chemical feed-stock because of many light oxygenates. I have read some papers on using bio-char use ...
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34 views

How to calculate flow rate and direction in system with multiple blowers

I have an odour control system where foul air is being extracted from multiple sources and then pushed into a scrubber vessel. Normally, all my designs look something like this: https://ibb.co/...
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1answer
44 views

How to control precisely the wall temperature of a tubular reactor?

I have modelled a multi-tubular reactor performing a Fischer-Tropsch synthesis of alkanes and I was wondering about the stability of such a reactor. Even a very tiny deviation of the wall temperature ...
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38 views

When teaching separation processes, which one should be introduced first? Distillation or absorption?

I am preparing a basic course on Separation Processes (5th semester, BSc Chemical Engineering). I can see that many well-known textbooks (e.g. Seader & Henley, Wankat) start by teaching in detail ...
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1answer
26 views

Doubt in proof of condition dG<=0

I tried proving the condition dG<=0 where G is Gibb's free energy and instead ended up proving dB<=0 where B is exergy. Can someone please explain what went wrong with my derivation. I have ...
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1answer
27 views

the volume in hydraulic retention time is of reactor/container or liquid

I have a tiny reactor, and the volume I need is 425ml. If there is no/few other reactants, then the volume in hydraulic retention time is clear: reactor/container's ...
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1answer
42 views

Magnetic treatment of hard water to prevent scale and corrosion? How does this work?

I ran across this company at their booth at a Tradeshow (2018). They claim to have a chemical free (and as far as I can tell - a power free) treatment method for hard water to minimize scale and ...
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2answers
57 views

Systems In “Thermodynamic Equilibrium”

I'm trying to find an answer to a question in one of my thermodynamics textbooks. (Undergraduate chemical engineering is the context). It is a conceptual question, asking, "Do all systems in ...
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3answers
48 views

Flaring System in Industries

Why is Flaring done in industries? Why can't the same gases be used for production of energy (Thermal energy)? Or why can't the excess gas be recycled in the previous stream from which it came?
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1answer
37 views

equivalent deduction of Non-mechanical thermodynamic work

"Work (as in Thermodynamics) is said to be done by a system if sole effect on the surroundings could be the raising of a weight." So, how is non mechanical work like : Chemical work, Magnetization ...
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32 views

performances of a continuous flow reactor

How can we know the evolution of the oulet concentration of a perfectly well-mixed continuous flow reactor taking into account the residence time distribution function called $E(t)$? I have heard ...
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40 views

Eulerian description of fluid flow

In Eulerian description of fluid flow, we observe how the properties of the fluid are changing at a point. Since a point has zero dimension hence a zero area, how can we make sense of the 'finite ...
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43 views

Enthalpy vs Heat

If we have a closed cylinder filled with a gas and we heat it, by $1^{st}$ law we have: $\Delta q=\Delta U$ (?) since $\Delta V$ = 0. But $\Delta H= \Delta U+ V. \Delta P$. What does that difference ...
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1answer
25 views

Entrainers to distill MTBE from Methanol? - Chemical Engineering Question

What have you found to be some effective entrainers to distill MTBE from Methanol, given the azeotropic conditions at 67%. I have tried to simulate 1-butanol, as well as ethanol, and numerous other ...
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16 views

calculating amount of oxygen in feed when there is excess oxygen

problem: In the Deacon process for the manufacture of chlorine, hydrochloric acid, $\text{HCl}$, and oxygen, $\text{O}_2$, react to form chlorine, $\text{Cl}_2$, and water, $\text{H}_2\text{O}$. ...