1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Shtirlitz [24]
3 years ago
8

In the manufacture of paper, logs are cut into small chips, which are stirred into an alkaline solution that dissolves several o

f the chemical constituents of wood but not cellulose. The slurry of undissolved chips in solution is further processed to recover most of the original solution constituents and dried wood pulp. In one such process, wood chips with a specific gravity of 0.640 containing 45.0 wt% water are treated to produce 2000.0 tons/day of dry wood pulp containing 85.0 wt% cellulose. The wood chips contain 47.0 wt% cellulose on a dry basis. Estimate the feed rate of logs (logs/min), assuming that the logs have an average diameter of 8.00 inches and an average length of 9.00 feet. 21.67 Ulogs/min
Chemistry
2 answers:
timama [110]3 years ago
8 0

Answer:

The estimate amount of feed rate is 15 logs/min as illustrated by calculations.

Kitty [74]3 years ago
7 0

Answer:

The estimated feed rate of logs is 14.3 logs/min.

Explanation:

The product of the process is 2000 tons/day of dry wood pulp, of 85 wt% of cellulose. That represents (2000*0.85)=1700 tons/day of cellulose.

That cellulose has to be feed by the wood chips, which had 47 wt% of cellulose in its composition. That means you need (1700/0.47)=3617 tons/day of wood chips to provide all that cellulose.

Th entering flow is wood chips with 45 wt% of water. This solution has an specific gravity of 0.640.

To know the specific gravity of the wood chips we have to write a volume balance. We also know that Mw=0.45*M and Mc=0.55*M.

V=V_c+V_w\\\\M/\rho=M_c/\rho_c+Mw/\rho_w\\\\M/\rho=0.55*M/\rho_c+0.45*M/\rho_w\\\\1/\rho=0.55/\rho_c +0.45/\rho_w\\\\0.55/\rho_c=1/\rho-0.45/\rho_w\\\\0.55/\rho_c=1/(0.64*\rho_w)-0.45/\rho_w=(1/\rho_w)*(\frac{1}{0.64}-\frac{0.45}{1}  )\\\\0.55/\rho_c=1.1125/\rho_w\\\\\rho_c=\frac{0.55}{1.1125}*\rho_w= 0.494*\rho_w

The specific gravity of the wood chips is 0.494.

The average volume of a log is

V_l=(\pi*D^{2} /4)*L=(3.1416*\frac{8^{2}  \, in^{2} }{4} )*9ft*(\frac{12 in}{1ft})= 21714 in^{3}=12.57 ft^{3}

The weight of one log is

M=\rho*V=0.494*\rho_w*12.57  ft^{3}\\\\M=0.494*62.4\frac{lbm}{ft^{3} }*12.57ft^{3}\\\\M=387.5lbm

To provide 3617 ton/day of wood chips, we need

n=\frac{supply}{M_{log}}=\frac{3617 tons/day}{387.5 lbm}*\frac{2204lbm}{1ton}\\\\n=20573 logs/day=14.3 logs/min

The feed rate of logs is 14.3 logs/min.

You might be interested in
What is the chemical formula for ammonium carbonate?
xenn [34]

(NH4),CO

(NH₄)₂ CO₃  

Explanation:

The chemical formula for ammonium carbonate is (NH4),CO

Ammonium carbonate is made up of:

  Ammonium ion

  Carbonate ion

Ammonium ion is represented by NH₄⁺

Carbonate ion is represented by CO₃²⁻

Now to write the formula, we are going to use their combining powers;

                   

                              NH₄⁺                     CO₃²⁻  

Combining

power                       1                             2

Exchange

of power                    2                            1

  Formula of compound              (NH₄)₂ CO₃  

learn more:

Chemical compound brainly.com/question/10585691

#learnwithBrainly

3 0
3 years ago
The diagram below represents the organizational levels of living things.
Tasya [4]

Answer: its vein

Explanation:

3 0
3 years ago
Read 2 more answers
Calculate the internal energy of 2 moles of argon gas (assuming ideal behavior) at 298 K. Suggest two ways to increase its inter
Dominik [7]
I hope this helps you.

5 0
3 years ago
_____________________ are trying to create better batteries that can store more energy, so that electric cars can travel further
lidiya [134]

Answer:

options?

Explanation:

i mean scientists fits so if any of the options have a scientist thats it

8 0
2 years ago
Read 2 more answers
Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the
Aleks04 [339]

Answer:

A = True

B = False

C = True.

I think this is the answer

8 0
3 years ago
Other questions:
  • Which of the following will increase the pressure of a gas in a closed container? I. part of the gas is removed II. the containe
    7·2 answers
  • What two elements of the Linnaean system make up an organisms scientific name
    11·1 answer
  • What structures allow small particles to cross the cell membrane
    12·1 answer
  • Does everything that you can see fit the definition for matter
    5·1 answer
  • What happens when a oceanic crust and a continent crust collide? What forms ? Which is more denser? What type of boundary?
    14·1 answer
  • How much of a sample remains after five half-lives have occurred?
    7·1 answer
  • A group of students used the instructions below to make a model of a watershed. When water washes over the water-soluble ink, th
    5·1 answer
  • Predict whether each reaction proceeds predominately by substitution, elimination, or whether the two combined. Write structure
    5·1 answer
  • What is the correct Lewis structure for a molecule of ammonia, NH3?
    6·1 answer
  • Help! question in picture!
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!