Hydrolisis of lactose

[SofiaHerrera]

Good day. I am trying to simulate the acid hydrolysis of lactose to produce glucose and galactose. The reaction is: Lactose + Water --> Glucose + Galactose
I am a beginner and in the program I carry this:
How could I go on?

#Hydrolisis of lactose
TITLE DEFINITION OF SUBSTANCES THAT ARE NOT IN THE PHREEQC DATABASE
Lactose       Lactose      0      C12H22O11     342
Glucose       Glucose      0      C6H12O6       180
Galactose     Galactose    0      C6H12O6       180

SOLUTION_SPECIES
Lactose=Lactose
 log_k 0
Glucose=Glucose
 log_k 0
Galactose=Galactose
 log_k 0

SOLUTION 1
units mol/L
Lactose  1 
Water    1

end

[MichaelZ20]

You need RATES and KINETICS blocks

[dlparkhurst]

Here is the simpleminded transformation of half the original mol of Lactose.

Code: [Select]

TITLE DEFINITION OF SUBSTANCES THAT ARE NOT IN THE PHREEQC DATABASE
SOLUTION_MASTER_SPECIES
Lactose       Lactose      0      C12H22O11     342
Glucose       Glucose      0      C6H12O6       180
Galactose     Galactose    0      C6H12O6       180

SOLUTION_SPECIES
Lactose=Lactose
 log_k 0
Glucose=Glucose
 log_k 0
Galactose=Galactose
 log_k 0

SOLUTION 1
units mol/L
Lactose  1
Water    1

REACTION
Lactose -1
H2O -1
Glucose 1
Galactose 1
0.5 mol
END
end

I don't think this model tells you anything, but perhaps as Michael suggests you want to fit a rate equation, in which case you need to change RATES to KINETICS and add a RATES definition.

[MichaelZ20]

By S. Bhattacharjee and D. Sarker (2017). Kinetic Study of Enzymatic Hydrolysis of Lactose in Whey