Method of preparing aromatic vinyl compound-vinyl cyanide compound polymer and apparatus for preparing the same

An apparatus for preparing an aromatic vinyl compound-vinyl cyanide compound polymer, comprising:

• a reactor in which a reaction mixture containing 40 to 80% by weight of an aromatic vinyl compound, 10 to 35% by weight of a vinyl cyanide compound, and 5 to 35% by weight of an organic solvent is polymerized;
• a heat exchanger for condensing the reaction mixture vaporized in the reactor;
• a gas pipe for transferring the vaporized reaction mixture from an upper space of the reactor to the heat exchanger;
• and
• a condensate pipe for transferring the condensed reaction mixture from the heat exchanger to one side of the gas pipe,
• wherein the condensate pipe comprises a spray nozzle.

A method of preparing an aromatic vinyl compound-vinyl cyanide compound polymer, comprising:

• polymerizing a reaction mixture containing an aromatic vinyl compound, a vinyl cyanide compound, and an organic solvent in a reactor;
• and
• transferring the vaporized reaction mixture present in an upper space of the reactor to a heat exchanger via a pipe and condensing the vaporized reaction mixture,
• wherein the condensed reaction mixture is transferred to one side of the pipe and sprayed into the pipe, and
• wherein a temperature of the reaction mixture transferred to the heat exchanger after the spraying is 100 to 140° C., and a temperature of the reaction mixture discharged from the heat exchanger is 15 to 50° C.