Mohammed Rafiq was convicted on December 12 of inflicting grievous bodily harm on Vikki Horsman, who is now 20.
Horsman was left scarred by the attack in April, when she was still 19.
Rafiq paid two men 50 pounds to attack her after she ended their relationship, Wolverhampton Crown Court heard.
Shannon Heaps, 23, and Steven Holmes, 25, were also found guilty of plotting to attack Horsman at a house in Tividale, West Midlands.
During the trial, the court heard Horsman had entered into a relationship with "controlling" Rafiq when she was 18.
He became angered when she broke up with him, and arranged for Heaps and Holmes to attack her with the corrosive liquid.
On April 15, she opened the door of the house and was met by a hooded figure who threw acid in her face.
She suffered "horrific" burns as a result, requiring specialist surgery to her face, neck, shoulders, and upper leg, police said.
They said Rafiq, who suffered minor burns himself when he was splashed with liquid, was initially treated as a victim but later charged.
Rafiq was convicted of a further charge of perverting the course of justice, the report said.
