Ground roasted coffee contains 10% soluble solids, 30 % water, and the balance inertinsoluble solids. In order to obtain an extract with high soluble solids content withouthaving to concentrate it for spray drying, a countercurrent extraction process is to be usedto prepare the extract. It is desired that the final extract contains 0.26 kg soluble/kg waterand that the soluble of the spent coffee grounds not to exceed 0.013 kg/kg dry inertsolids. The coffee grounds carry 1kg water per kg of soluble free inert solids and thisquantity is constant with the solute concentration in the extract. Determine the number ofextraction stages needed for this process.

To determine the number of extraction stages needed for the process, we can use the concept of the…

Answered: Ground roasted coffee contains 10%…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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1.2048 g of impure Na₂CO3 is dissolved and allowed to react with a solution of Cach. The resulting CaCO; after precipitation, filtration, and drying was found to weigh 1.0362 g. Assuming that the impurities do not contribute to the weight of the precipitate, Calculate the percent purity of Na₂CO3.
L-serine is produced by fermentation and recovered and purified by crystallization at 10oC. To increase the yield of the crystallization step, methanol is added to the system. An aqueous solution containing 27wt% L-serine is added with methanol to a batch crystallizer and cooled to 10oC. The crystals are then recovered by filtration. Draw a flowchart for this process showing the key unit operations with appropriate stream labels and composition.
4. tests on solid G Tests were carried out and the following observations made. tests on solid G observations test 1 A flame test was carried out on solid G. red colour test 2 Dilute nitric acid was added to solid G. rapid effervescence The gas produced was passed through limewater. limewater turned milky (e) Identify solid G. [2]
In the process of drying carrots using a parallel flow drying system, the material with a moisture content of 85% enters the drying system at a rate of 500 Kg / hour to produce dry carrots with a moisture content of 20%. If it is known that hot air used as the drying medium has a humidity ratio of 0.006 Kg of water per Kg of dry air and the flow of hot air enters the system at a rate of 200 Kg of air for each dry matter produced, calculate the ratio of humidity to air leaving the system assuming that the system is under steady state conditions.
1) Maintaining the proper level of Amine in the contactor and reactivator is essential for stable operation for avoiding reboiler overload. Select one: True False 2) Natural gas usually contains several impurities for example, sweet gases that need to be removed from natural gas to meet the gas pipelines specifications. Select one: True False 3) Natural gas is considered “wet” when moisture is present in the hydrocarbon gas mixture. Select one: True False
6) Flash Distillation Model ... Suppose we decide to distill the same 1000 moles of the 82 mole% cyclohexane and 18 mole% toluene mixture (see the Batch distillation problem) over a ten hour period (one day) using a flash distillation. In this case we would have a feed stream of 88.3 moles/hr and a bottoms flow rate of 11 moles/hr in order to achieve the same overall material result. A cyclohexane-toluene xy-equilibrium figure is provided for your use if needed. 0 a) For the flash option, determine the distillate and bottoms compositions. b) What would you recommend - batch or flash? Why? F=√+L zF=Y₂V*XBL F= = 1000 moles x=0.82 d=0.883 Xb= 0.117 BUF 0.020 SE301 2ACT 32581 2.12 S884
2) Determine the minimum mass of ethylene glycol (C2H6O2) that must be dissolved in 14500 g water to prevent the solution from freezing at -12.0 °F.
An aqueous solution containing 60% Na2S2O3 and 1% soluble impurities is diluted with water andfed to a crystallizer where it is cooled in order to crystallize Na2S2O3-5H2O. The crystals carry0.05 kg of solution (excluding impurities) per kg of crystals. The free water present in the adheringsolution is removed on drying the crystals. The final dried product contains not more than 0.1%impurity. The solubility of the hydrate is 1.5 kg Na2S2O3-5H2O/kg free water. On the basis of 100kg of 60% solution, calculate the following:a) the amount of water in kilograms before coolingb) the amount of crystals in kilograms formedc) the percentage recovery of Na2S2O3 in the dried hydrated crystals Show solution step-by-step
A wet paper pulp is found to contain 70% water. 61% of the original water was removed by drying. What is the concentration of water in the dried paper pulp? (use as the basis, 1 pound of wet pulp).
Silver is used in different applications that result in contact with skin and mucosal surfaces (e.g., jewelry, wound dressings, or eye drops). Intact skin poses an effective barrier against the absorption of silver. Mucosal surfaces are observed to be less effective barriers and compromised skin is often a poor barrier. Silver can deposit as particles in the human body causing a blue-gray discoloration known as argyria. Silver metal can be produced by reduction of silver nitrate using copper. Cu + AgNO3 Cu(NO3)2 + Ag Calculate the theoretical mass and the percent yield of the silver if we used 5.804 g of copper and silver nitrate.
Magnesium metal, a gray solid, is heated in a crucible in the presence of oxygen. A white powder is collected from the crucible. This is an example of A) a chemical change B) a separation C) a mixture D) a physical change
1.) How does the purity of coconut wine obtained from distillation is being tested? 2.) A mixture contain BENZOIC ACID, SALT, POWERDERD SILICA (white sand) and CONTAMINATED with COLORING. The aim of the experiment is to recover the PURE BENZOIC ACID and SALT , make a schematic diagram or sketch on what method is applied to separate each component from the mixture to obtain the desired product.

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