Production of Acrylonitrile from the ammoxidation of propylene
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Transcript of Production of Acrylonitrile from the ammoxidation of propylene
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PRODUCTION OF ACRYLONITRILE BY AMMOXIDATION OF PROPYLENE
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GROUP MEMBERS
Waheed Ahmed (2k11-ChE-09) Adnan Rafi (2k11-ChE-16) Ahmed Haroon (2k11-ChE-23) Shahzad Ali Zahid (2k11-ChE-49)
1a
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CONTENTSIntroductionProcess DescriptionSite SelectionHazop study and EIA
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Introduction
Waheed Ahmad (2k11-Che-09)
2a
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INTRODUCTION
It was first prepared in 1893 by the French chemist Charles
Chemical Formula C3H3N. This pungent-smelling colorless liquid It is monomer for the manufacture of plastics. It produce toxic combustion products
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PHYSICAL PROPERTIES
colorless liquid and faint characteristic odor. Other trade names. Acrylonitrile polymerizes explosively.
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3c
Property Value
Molecular weight 53.06
Boiling point, 0C 77.3 At 103.3 kPa
Critical temperature,0C
246.0
Density, g/L 806.0 At 20"C
Explosive limit at 250C, vol%
3.05-17.0
Flash point 0C -5
Freezing point, 0C -83.55
Heat of polymerization, kJ/mol
-72.4
Ignition temperature, °C 481.0
Viscosity at 25°C, cP 0.34
Heat capacity, 2.094
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CHEMICAL PROPERTIES
Reactions of the Nitrile Group
Hydration and Hydrolysis Alcoholysis
NH-HX
CH2=CHCN + ROH + HX XCH2CH2—C—OR
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Reactions of the Double Bond Diels-Alder Reactions Hydrogenation Halogenations Hydrodimerization.
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Reactions of Both Functional Groups Cyanoethylation Reactions (Michael-Type
Additions)
CH2=CHCN + RH RCH2CH2CN
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USES AND APPLICATION
Acrylic Fibers. Copolymer Resin ("Plastics''). Nitrile Rubbers and Resins.
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Shahzad ali zahid
(2k11-Che-49)
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MANUFACTURING PROCESSES
Early Processesa. Passage through ethylene cyanohydrin
The following reactions are involved: CH2-CH2 + HCN CH2OH-CH2-CN
O CH2OH-CH2-CN CH2=CH-CN+H2O
Temperature 200°CYield 90%
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b. Addition of hydrogen cyanide to acetylene
HC ≡ CH +HCN CH2=CH-CN
ΔH0298 ≈ -175 kJ / mol
catalyst consisting of cuprous chloride andammonium chloride in solution in hydrochloric acid temperature of 80 to 90°C molar yield is up to 90 per cent by-products are acetaldehyde, vinyl acetylene,divinyl
acetylene, vinyl chloride, cyano butene, lacto nitrile,methyl vinyl ketone
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C. Passage through lactonitrile
CH3-CHO + HCN CH3CHOH-CN (10-20) °C
CH3CHOH-CN CH2-CH-CN + H2O
Yield 90 percentD. Nitric oxide with propylene
4CH2=CH-CH3+6NO 4CH2=CH-CN + 6H2O + N2
E. From Propionitrile.
CH3CH2CN CH2 = CHCN + H2
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F. From Propionaldehyde.
CH3CH2CHO + NH3 CH2 = CHCN + H20 + 2H2
G. Acrylonitrile Manufacture by ammoxidation of propylene (Sohio Process)
CH2=CH-CH3+NH3+3/2O2 CH2=CH-CN+3H2O
ΔH0298 ≈ -515kJ/mol
Better quality product Economical Its conversion in a single pass is high Energy efficient process
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PROCESS DESCRIPTION
Raw Material
Ammonia (NH3) Air Propylene(C3H6)
FEED RATIO= PROPENE/AMMONIA/AIR=1/1.2/9.5
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the oxygen (air) is introduced below mixed propylene and ammonia through
“spiders” positioned above the grid The operating pressure should be low to prevent
the by-ptoducts The residence time in the reactor is between
2 and 20 s The main reaction isCH2=CH-CH3+NH3+3/2O2 CH2=CH-CN+3H2O
ΔH0298 ≈ -515kJ/mol
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It now appears clear that this overall result can be explained by the production of Acrolein as the main intermediate
CH2 = CH – CH3 + O2 CH2 = CH – CHO + H2O
CH2 = CH – CHO + NH3 CH2 = CH – CH = NH + H2O
CH2 = CH – CH = NH + 1/202 CH2 = CH – CN + H2O
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EFFECT OF DIFFERENT VARIABLES ON CONVERSATION
Effect of residence time Effect of reaction temperature Effect of reaction pressure Effect of Catalyst
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REACTION MECHANISM
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PROCESS FLOW DIAGRAM
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QUENCHER It is used to remove ammonia from the reactor
effluent and low down its temperature using sulphuric acid. It produces ammonium sulphate salt ((NH4)2SO4) at bottom which is used as a fertilizer and the top effluent is sent to absorber.
No. of Stages : 10 Sulphuric acid: 30% concentrated H2SO4 Bottom stream coming out of quencher mainly consists
of ammonium sulphate. This stream is further passed into Crystallizer where crystals of ammonium sulphate are produced which is used as fertilizer.
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ABSORBER Function of Absorber is to remove the residual gases,
containing unconverted propylene, CO2 and other VOC. Random Packing: 5 segments of Raschig rings made up of
ceramic, diameter=0.375in Height of each packing segment=10ft Column Diameter=5ft
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RECOVERY UNIT
Idea is to recover the useful components from the aqueous solution like ACN, AN etc.
No. of stages: 10 Random Packing: Saddles made up of ceramic,
diameter=0.5in Total tower height=40ft Column diameter=5ft
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CATALYST
Sohio, who initially employed bismuth phosphomolybdate in 1967 by a mixture based on oxides of antimony and
uranium In 1972, Sohio then returned to an iron and bismuth
phosphomolybdate doped by additions of cobalt, nickel and potassium
The catalysts used in the process are mostly based on mixed metal oxides such as bismuth-molybdenum oxide, iron-antimony oxide, uranium-antimony oxide, tellurium - molybdenum oxide etc.
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Adnan Rafi
2k11-Che-15
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HAZOP STUDY
A HAZOP survey is one of the most common and widely accepted methods of systematic qualitative hazard analysis.
It is used for both new or existing facilities and can be applied to a whole plant, a production unit, or a piece of equipment
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OBJECTIVES OF A HAZOP STUDY To identify areas of the design. To identify and study features of the design. To familiarize the study team. To ensure a systematic study. To identify pertinent design information. To provide a mechanism for feedback.
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STEPS OF HAZOP STUDY
1. Specify the purpose2. Select the HAZOP study team3. Collect data
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5a
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HAZOP GUIDE WORDS AND MEANINGS
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Guide Words Meanings
No Negation of design Intent
Less Quantitative decrease
More Quantitative increase
Part of Qualitative decrease
As well as Qualitative increase
Reverse Logical opposite of
Other than Complete substitution
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4. Conduct the study5. Write the report HAZOP Study of Storage Tank for Propylene