알칼리 금속염의 제조 방법

• Main Authors: KOIWA MASAKAZU, MINEHARA HIROKI
• Format: Patent
• Language: Korean
• Published: 01.09.2021
• Subjects: CHEMISTRY; COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM,RUBIDIUM, CAESIUM, OR FRANCIUM; COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS; FERROUS OR NON-FERROUS ALLOYS; INORGANIC CHEMISTRY; METALLURGY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; SEPARATION; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

본 발명은, 0.75MPa의 조작 압력에서 25℃, pH 6.5의 1000ppm 글루코오스 수용액 및 25℃, pH 6.5의 1000ppm 이소프로필알코올 수용액을 각각 투과시켰을 때의 글루코오스 제거율 및 이소프로필알코올 제거율이 하기 식 (1) 및 (2)를 동시에 만족하는 분리막으로, 알칼리 금속염 수용액으로부터 정제 저해 물질을 제거하는 전처리 공정과, 상기 전처리 공정 후의 알칼리 금속염 수용액으로부터 알칼리 금속염을 회수하는 회수 공정을 포함하는 것을 특징으로 하는, 알칼리 금속염의 제조 방법: 90％>글루코오스 제거율≥50％· · · (1) 글루코오스 제거율-이소프로필알코올 제거율≥50％· · · (2) 에 관한 것이다. The present invention relates to an alkali metal salt manufacturing method that is characterized by including: a pretreatment step in which a refining-inhibiting substance is removed from an aqueous solution of an alkali metal salt, using a separation membrane that has a glucose removal rate and an isopropyl alcohol removal rate simultaneously satisfying expressions (1) and (2) below when a 1000ppm aqueous solution of glucose with a temperature of 25°C and a pH of 6.5 and a 1000ppm aqueous solution of isopropyl alcohol with a temperature of 25°C and a pH of 6.5 have respectively been made to pass therethrough using an operating pressure of 0.75MPa; and a recovery step in which the alkali metal salt is recovered from the aqueous solution of the alkali metal salt after the pretreatment step. (1): 90% > glucose removal rate ≥ 50%. (2): glucose removal rate - isopropyl alcohol removal rate ≥ 50%.