SOLVENT SEPARATION METHOD

• Main Authors: KANAMARU JUNICHI, OTOYO TAKEHIKO, SHIOZAKI SHUJIRO
• Format: Patent
• Language: English; Japanese
• Published: 31.08.2017
• Subjects: CHEMISTRY; METALLURGY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TRANSPORTING; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

PROBLEM TO BE SOLVED: To provide a method for using, in a forward osmosis process, a thermally-induced phase separation substance which has a high osmotic pressure in thermally-induced phase separation, thereby concentrating supply flow to have high concentration and efficiently collecting water from the supply flow.SOLUTION: A solvent separation method includes: a step 1 of causing counter flow or parallel flow of supply flow 2 containing a solvent 1 for thermally-induced phase separation substance flow 3 containing a thermally-induced phase separation substance through a semipermeable membrane 4, thereby moving the solvent 1 to the thermally-induced phase separation substance flow 3; and a step 2 of heating the thermally-induced phase separation substance flow 3, to which the solvent 1 has been moved, to not less than the cloud point of the thermally-induced phase separation substance, to separate the thermally-induced phase separation substance flow into solvent rich flow 8 and thermally-induced phase separation substance rich flow 3. In the solvent separation method, the thermally-induced phase separation substance is a certain hydrophobic group-modified alkylene oxide polymer, and the number of carbon atoms included in the hydrophobic group is 1 to 3.SELECTED DRAWING: Figure 1 【課題】熱相分離したときの浸透圧が高い熱相分離物質を正浸透プロセスに用いることにより、供給流を高濃度に濃縮し、供給流から効率的に水を回収するための方法を提供する。【解決手段】溶媒１を含有する供給流２を、熱相分離物質を含有する熱相分離物質流３と、半透膜４を介して向流又は並流させることによって溶媒１を熱相分離物質流３に移動させる工程１と、溶媒１が移動した熱相分離物質流３を前記熱相分離物質の曇点以上に加熱して、溶媒リッチ流８と熱相分離物質リッチ流３とに分離する工程２と、を有する溶媒分離方法であって、前記熱相分離物質が、特定の疎水基修飾アルキレンオキシドポリマーであり、前記疎水基の有する炭素数が１〜３個である、溶媒分離方法。【選択図】図１