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A Library of Mixed-Integer and Continuous Nonlinear Programming Instances

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Instance: alkylation

Formats ams gms mod nl osil
Primal Bounds
1768.80696400 p1 ( gdx sol )
(infeas: 7e-15)
Dual Bounds
1768.80696500 (ANTIGONE)
1768.80701500 (BARON)
1768.80699200 (COUENNE)
1768.81518900 (LINDO)
1872.07134200 (SCIP)
References Edgar, T F, Himmelblau, D M, and Lasdon, L S, Optimization of Chemical Processes, McGraw Hill, Boston, 2001.
Source Housam Binous
Added to library 31 Jul 2001
Problem type NLP
#Variables 10
#Binary Variables 0
#Integer Variables 0
#Nonlinear Variables 8
#Nonlinear Binary Variables 0
#Nonlinear Integer Variables 0
Objective Sense max
Objective type quadratic
Objective curvature indefinite
#Nonzeros in Objective 6
#Nonlinear Nonzeros in Objective 2
#Constraints 11
#Linear Constraints 5
#Quadratic Constraints 2
#Polynomial Constraints 2
#Signomial Constraints 0
#General Nonlinear Constraints 2
Operands in Gen. Nonlin. Functions mul div
Constraints curvature indefinite
#Nonzeros in Jacobian 31
#Nonlinear Nonzeros in Jacobian 12
#Nonzeros in (Upper-Left) Hessian of Lagrangian 19
#Nonzeros in Diagonal of Hessian of Lagrangian 5
#Blocks in Hessian of Lagrangian 2
Minimal blocksize in Hessian of Lagrangian 4
Maximal blocksize in Hessian of Lagrangian 4
Average blocksize in Hessian of Lagrangian 4.0
#Semicontinuities 0
#Nonlinear Semicontinuities 0
#SOS type 1 0
#SOS type 2 0
Infeasibility of initial point 0.44
Sparsity Jacobian Sparsity of Objective Gradient and Jacobian
Sparsity Hessian of Lagrangian Sparsity of Hessian of Lagrangian

$offlisting
*  
*  Equation counts
*      Total        E        G        L        N        X        C        B
*         12        4        8        0        0        0        0        0
*  
*  Variable counts
*                   x        b        i      s1s      s2s       sc       si
*      Total     cont   binary  integer     sos1     sos2    scont     sint
*         11       11        0        0        0        0        0        0
*  FX      0
*  
*  Nonzero counts
*      Total    const       NL      DLL
*         38       24       14        0
*
*  Solve m using NLP maximizing objvar;


Variables  x1,x2,x3,x4,x5,x6,x7,x8,x9,x10,objvar;

Equations  e1,e2,e3,e4,e5,e6,e7,e8,e9,e10,e11,e12;


e1.. -0.063*x4*x7 + 5.04*x1 + 0.035*x2 + 10*x3 + 3.36*x5 + objvar =E= 0;

e2..    x1 - 1.22*x4 + x5 =E= 0;

e3.. -98000*x3/(x4*x9 + 1000*x3) + x6 =E= 0;

e4.. -(x2 + x5)/x1 + x8 =E= 0;

e5.. (1.12 + 0.13167*x8 - 0.00667*x8**2)*x1 - 0.99*x4 =G= 0;

e6.. -(1.12 + 0.13167*x8 - 0.00667*x8**2)*x1 + 1.01010101010101*x4 =G= 0;

e7.. 1.098*x8 - 0.038*x8**2 + 0.325*x6 - 0.99*x7 =G= -57.425;

e8.. -(1.098*x8 - 0.038*x8**2) - 0.325*x6 + 1.01010101010101*x7 =G= 57.425;

e9..  - 0.9*x9 - 0.222*x10 =G= -35.82;

e10..    1.11111111111111*x9 + 0.222*x10 =G= 35.82;

e11..    3*x7 - 0.99*x10 =G= 133;

e12..  - 3*x7 + 1.01010101010101*x10 =G= -133;

* set non-default bounds
x1.lo = 1E-6; x1.up = 2000;
x2.lo = 1E-6; x2.up = 16000;
x3.lo = 1E-6; x3.up = 120;
x4.lo = 1E-6; x4.up = 5000;
x5.lo = 1E-6; x5.up = 2000;
x6.lo = 85; x6.up = 93;
x7.lo = 90; x7.up = 95;
x8.lo = 3; x8.up = 12;
x9.lo = 0.01; x9.up = 4;
x10.lo = 145; x10.up = 162;

* set non-default levels
x1.l = 1745;
x2.l = 12000;
x3.l = 110;
x4.l = 3048;
x5.l = 1974;
x6.l = 89.2;
x7.l = 92.8;
x8.l = 8;
x9.l = 3.6;

Model m / all /;

m.limrow=0; m.limcol=0;
m.tolproj=0.0;

$if NOT '%gams.u1%' == '' $include '%gams.u1%'

$if not set NLP $set NLP NLP
Solve m using %NLP% maximizing objvar;


Last updated: 2018-08-07 Git hash: fccdb193
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