(569ah) Systematic Design and Optimization of Acrylonitrile Production | AIChE

Other Sites & Tools

Technical Groups

(569ah) Systematic Design and Optimization of Acrylonitrile Production

Authors 

Leth-Espensen, A. - Presenter, Technical University of Denmark
Müller Christensen, S. - Presenter, DTU
Fedorova, M., Technical University of Denmark






Anna
Marina Fedorova
2
2
2014-05-12T16:52:00Z
2014-05-12T16:52:00Z
1
449
2563
DTU
21
6
3006
14.00







Clean
Clean
false



false
false
false

EN-US
X-NONE
X-NONE

























DefSemiHidden="true" DefQFormat="false" DefPriority="99"
LatentStyleCount="267">
UnhideWhenUsed="false" QFormat="true" Name="Normal"/>
UnhideWhenUsed="false" QFormat="true" Name="heading 1"/>


















UnhideWhenUsed="false" QFormat="true" Name="Title"/>

UnhideWhenUsed="false" QFormat="true" Name="Subtitle"/>
UnhideWhenUsed="false" QFormat="true" Name="Strong"/>
UnhideWhenUsed="false" QFormat="true" Name="Emphasis"/>
UnhideWhenUsed="false" Name="Table Grid"/>

UnhideWhenUsed="false" QFormat="true" Name="No Spacing"/>
UnhideWhenUsed="false" Name="Light Shading"/>
UnhideWhenUsed="false" Name="Light List"/>
UnhideWhenUsed="false" Name="Light Grid"/>
UnhideWhenUsed="false" Name="Medium Shading 1"/>
UnhideWhenUsed="false" Name="Medium Shading 2"/>
UnhideWhenUsed="false" Name="Medium List 1"/>
UnhideWhenUsed="false" Name="Medium List 2"/>
UnhideWhenUsed="false" Name="Medium Grid 1"/>
UnhideWhenUsed="false" Name="Medium Grid 2"/>
UnhideWhenUsed="false" Name="Medium Grid 3"/>
UnhideWhenUsed="false" Name="Dark List"/>
UnhideWhenUsed="false" Name="Colorful Shading"/>
UnhideWhenUsed="false" Name="Colorful List"/>
UnhideWhenUsed="false" Name="Colorful Grid"/>
UnhideWhenUsed="false" Name="Light Shading Accent 1"/>
UnhideWhenUsed="false" Name="Light List Accent 1"/>
UnhideWhenUsed="false" Name="Light Grid Accent 1"/>
UnhideWhenUsed="false" Name="Medium Shading 1 Accent 1"/>
UnhideWhenUsed="false" Name="Medium Shading 2 Accent 1"/>
UnhideWhenUsed="false" Name="Medium List 1 Accent 1"/>

UnhideWhenUsed="false" QFormat="true" Name="List Paragraph"/>
UnhideWhenUsed="false" QFormat="true" Name="Quote"/>
UnhideWhenUsed="false" QFormat="true" Name="Intense Quote"/>
UnhideWhenUsed="false" Name="Medium List 2 Accent 1"/>
UnhideWhenUsed="false" Name="Medium Grid 1 Accent 1"/>
UnhideWhenUsed="false" Name="Medium Grid 2 Accent 1"/>
UnhideWhenUsed="false" Name="Medium Grid 3 Accent 1"/>
UnhideWhenUsed="false" Name="Dark List Accent 1"/>
UnhideWhenUsed="false" Name="Colorful Shading Accent 1"/>
UnhideWhenUsed="false" Name="Colorful List Accent 1"/>
UnhideWhenUsed="false" Name="Colorful Grid Accent 1"/>
UnhideWhenUsed="false" Name="Light Shading Accent 2"/>
UnhideWhenUsed="false" Name="Light List Accent 2"/>
UnhideWhenUsed="false" Name="Light Grid Accent 2"/>
UnhideWhenUsed="false" Name="Medium Shading 1 Accent 2"/>
UnhideWhenUsed="false" Name="Medium Shading 2 Accent 2"/>
UnhideWhenUsed="false" Name="Medium List 1 Accent 2"/>
UnhideWhenUsed="false" Name="Medium List 2 Accent 2"/>
UnhideWhenUsed="false" Name="Medium Grid 1 Accent 2"/>
UnhideWhenUsed="false" Name="Medium Grid 2 Accent 2"/>
UnhideWhenUsed="false" Name="Medium Grid 3 Accent 2"/>
UnhideWhenUsed="false" Name="Dark List Accent 2"/>
UnhideWhenUsed="false" Name="Colorful Shading Accent 2"/>
UnhideWhenUsed="false" Name="Colorful List Accent 2"/>
UnhideWhenUsed="false" Name="Colorful Grid Accent 2"/>
UnhideWhenUsed="false" Name="Light Shading Accent 3"/>
UnhideWhenUsed="false" Name="Light List Accent 3"/>
UnhideWhenUsed="false" Name="Light Grid Accent 3"/>
UnhideWhenUsed="false" Name="Medium Shading 1 Accent 3"/>
UnhideWhenUsed="false" Name="Medium Shading 2 Accent 3"/>
UnhideWhenUsed="false" Name="Medium List 1 Accent 3"/>
UnhideWhenUsed="false" Name="Medium List 2 Accent 3"/>
UnhideWhenUsed="false" Name="Medium Grid 1 Accent 3"/>
UnhideWhenUsed="false" Name="Medium Grid 2 Accent 3"/>
UnhideWhenUsed="false" Name="Medium Grid 3 Accent 3"/>
UnhideWhenUsed="false" Name="Dark List Accent 3"/>
UnhideWhenUsed="false" Name="Colorful Shading Accent 3"/>
UnhideWhenUsed="false" Name="Colorful List Accent 3"/>
UnhideWhenUsed="false" Name="Colorful Grid Accent 3"/>
UnhideWhenUsed="false" Name="Light Shading Accent 4"/>
UnhideWhenUsed="false" Name="Light List Accent 4"/>
UnhideWhenUsed="false" Name="Light Grid Accent 4"/>
UnhideWhenUsed="false" Name="Medium Shading 1 Accent 4"/>
UnhideWhenUsed="false" Name="Medium Shading 2 Accent 4"/>
UnhideWhenUsed="false" Name="Medium List 1 Accent 4"/>
UnhideWhenUsed="false" Name="Medium List 2 Accent 4"/>
UnhideWhenUsed="false" Name="Medium Grid 1 Accent 4"/>
UnhideWhenUsed="false" Name="Medium Grid 2 Accent 4"/>
UnhideWhenUsed="false" Name="Medium Grid 3 Accent 4"/>
UnhideWhenUsed="false" Name="Dark List Accent 4"/>
UnhideWhenUsed="false" Name="Colorful Shading Accent 4"/>
UnhideWhenUsed="false" Name="Colorful List Accent 4"/>
UnhideWhenUsed="false" Name="Colorful Grid Accent 4"/>
UnhideWhenUsed="false" Name="Light Shading Accent 5"/>
UnhideWhenUsed="false" Name="Light List Accent 5"/>
UnhideWhenUsed="false" Name="Light Grid Accent 5"/>
UnhideWhenUsed="false" Name="Medium Shading 1 Accent 5"/>
UnhideWhenUsed="false" Name="Medium Shading 2 Accent 5"/>
UnhideWhenUsed="false" Name="Medium List 1 Accent 5"/>
UnhideWhenUsed="false" Name="Medium List 2 Accent 5"/>
UnhideWhenUsed="false" Name="Medium Grid 1 Accent 5"/>
UnhideWhenUsed="false" Name="Medium Grid 2 Accent 5"/>
UnhideWhenUsed="false" Name="Medium Grid 3 Accent 5"/>
UnhideWhenUsed="false" Name="Dark List Accent 5"/>
UnhideWhenUsed="false" Name="Colorful Shading Accent 5"/>
UnhideWhenUsed="false" Name="Colorful List Accent 5"/>
UnhideWhenUsed="false" Name="Colorful Grid Accent 5"/>
UnhideWhenUsed="false" Name="Light Shading Accent 6"/>
UnhideWhenUsed="false" Name="Light List Accent 6"/>
UnhideWhenUsed="false" Name="Light Grid Accent 6"/>
UnhideWhenUsed="false" Name="Medium Shading 1 Accent 6"/>
UnhideWhenUsed="false" Name="Medium Shading 2 Accent 6"/>
UnhideWhenUsed="false" Name="Medium List 1 Accent 6"/>
UnhideWhenUsed="false" Name="Medium List 2 Accent 6"/>
UnhideWhenUsed="false" Name="Medium Grid 1 Accent 6"/>
UnhideWhenUsed="false" Name="Medium Grid 2 Accent 6"/>
UnhideWhenUsed="false" Name="Medium Grid 3 Accent 6"/>
UnhideWhenUsed="false" Name="Dark List Accent 6"/>
UnhideWhenUsed="false" Name="Colorful Shading Accent 6"/>
UnhideWhenUsed="false" Name="Colorful List Accent 6"/>
UnhideWhenUsed="false" Name="Colorful Grid Accent 6"/>
UnhideWhenUsed="false" QFormat="true" Name="Subtle Emphasis"/>
UnhideWhenUsed="false" QFormat="true" Name="Intense Emphasis"/>
UnhideWhenUsed="false" QFormat="true" Name="Subtle Reference"/>
UnhideWhenUsed="false" QFormat="true" Name="Intense Reference"/>
UnhideWhenUsed="false" QFormat="true" Name="Book Title"/>



/* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin-top:0cm; mso-para-margin-right:0cm; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0cm; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-ansi-language:EN-US; mso-fareast-language:EN-US;}







normal">Systematic Design and
Optimization of Acrylonitrile Production

Steen M. Christensen, Anna
Leth-Espensen, Marina Fedorova*

Computer Aided Process Engineering
Center, Department of Chemical and Biochemical Engineering, Technical
University of Denmark, DK-2800 Lyngby, Denmark

*mfad@kt.dtu.dk

Acrylonitrile
is an important starting material for a wide range of polymers and copolymers
and is found in numerous everyday products like conveyer belts, Lego blocks,
and fabric material. In this project, which is part of a MSc Process Design
course at the Technical University of Denmark, a production facility of
acrylonitrile is designed. The objective is to design a process for the
production of 100 000 tons of acrylonitrile per year.  The designed process must be environmentally
acceptable, must apply heat integration and be optimal with respect to cost.

The
production of acrylonitrile is nowadays performed through the Sohio process.
This process is a reaction between ammonia, air, and propene that react through
the catalytic mechanism of ammoxidation.
Other production methods for acrylonitrile including the ethylene
cyanohydrine process and the ammoxidation of propane are also possible. A new
process that could be interesting in the future is the ammoxidation of propane,
because of the lower cost of propane compared to propylene. However, the
selectivity for product in this process is too low. Therefore this project
focuses mainly on designing and optimizing the known Sohio process.

 The design is done systematically from generating
a simple flow sheet to a rigorous model of the plant. The simple flow sheet is
created by the Hierarchical Decomposition Douglas method. The design has then
been optimized to find a more sustainable solution, both with respect to
economics and the environment. Also, heat integration has been performed to
reduce the energy consumption. 

With
respect to the economical optimization especially the by-products have been
taken into account. In the production of acrylonitrile two other saleable
by-products are produced though in considerably smaller amounts than
acrylonitrile. One is hydrogen cyanide which is converted into acetone
cyanohydrin for easy shipping and another is acetonitrile. The purification of
these two by-products and the acrylonitrile is a difficult process, which has
been considered in detail in this project. The separation methods include
neutralization, absorption by water, stripping, decanting, distillation,
reactive distillation and a pressure swing distillation column of which
especially the last two are interesting and crucial in order to obtain the required
purity of the acetonitrile.

Several
alternatives to the base case design were obtained after performing
optimization and sustainability and LCA analyses. With respect to the
environmental optimization especially the recycle of process water and definition
of the optimum pressure and temperature settings for the distillation columns
save energy and resources.

More Conference Links