Industrial evaporation apparatus

An industrial evaporation apparatus in which a liquid containing a material having a lower boiling point than that of said liquid is made to flow down along an external surface of a guide that does not themselves have a heat source, during which time said lower boiling point material is evaporated, wherein improvement comprises:

• (1) said evaporation apparatus comprising a liquid receiving port;
• a liquid feeding zone for feeding said liquid via a perforated plate to said guide provided in an evaporation zone;
• said evaporation zone having a plurality of guides that extend downward within a space enclosed by said perforated plate, a side-wall casing, and a bottom-wall casing;
• an evaporated material outlet provided in said evaporation zone;
• and a liquid discharge port provided in a lowermost portion of the bottom-wall casing;
• (2) a flow path controlling member which has a function of making said liquid fed onto the perforated plate from said liquid receiving port flow mainly from a peripheral portion toward a middle portion of the perforated plate being provided in said liquid feeding zone;
• (3) an internal sectional area A (m2) taken through a horizontal plane of the side-wall casing of said evaporation zone satisfying the following formula (1):
• 0.7≦A≦300 (1);
• (4) a ratio between said A (m2) and an internal sectional area B (m2) taken through a horizontal plane of the liquid discharge port satisfying the following formula (2):
• 20≦A/B≦1000 (2);
• (5) the bottom-wall casing constituting the bottom portion of said evaporation zone being connected at an internal angle C (°) to said side-wall casing on said bottom-wall casing, wherein said angle C (°) satisfies the following formula (3):
• 110≦C≦165 (3);
• (6) a length h (cm) of each of said guides satisfying the following formula (4):
• 150≦h≦5000 (4);
• (7) a total external surface area S (m2) of said guides satisfying the following formula (5):
• 2≦S≦50000 (5).