| 摘要 |
PURPOSE:To prevent a position of crystals deposited on a vessel wall from going up by attaching a water repellent material to a vessel wall at a position above the liquid surface of an aqueous solution of a compound which is contained in that vessel. CONSTITUTION:A water repellent material 7 (e.g. oil impregnated paper tape) is attached to a wall 4 of a vessel 1 at a position above the liquid surface of an aqueous solution of a compound (e.g. aqueous solution of urea) which is contained in that vessel. By adopting this method, the water repellent material is not wetted by a surface tension of e.g. aqueous solution of urea and deposited crystals do not move upward beyond that water repellent material. |
