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公开(公告)号：EP4417581A1
公开(公告)日：2024-08-21
申请号：EP22880682.4
申请日：2022-09-08
发明人： OKUYAMA Hiroki , HARUTA Tomoaki , OGAWA Ayako
摘要： A method (40) for producing a cobalt sulfate crystal, which is performed for obtaining crystals of a cobalt sulfate heptahydrate from a cobalt sulfate-containing aqueous solution, the method includes a crystallization step (10) of subjecting a cobalt sulfate-containing aqueous solution (11) to evaporative concentration to obtain a slurry (12) containing cobalt sulfate crystals, a separation step (20) of subjecting the slurry (12) obtained in the crystallization step (10) to solid-liquid separation to obtain a dewatered cake (21) of the cobalt sulfate crystals, and a drying step (30) of drying the dewatered cake (21) obtained in the separation step (20) by a flash drying of bringing the dewatered cake (21) into direct contact with a drying medium (31) to obtain the cobalt sulfate crystals (41).
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公开(公告)号：EP4365161A1
公开(公告)日：2024-05-08
申请号：EP22833328.2
申请日：2022-07-01
发明人： NISHIZAWA Daisuke , OGAWA Ayako , FUJIWARA Taku , SUZUKI Kenji
摘要： A method for producing crystals of bis-2-hydroxyethyl terephthalate of the present invention includes performing a step of, with use of a crystallizer (10) that performs a crystallization operation of an aqueous solution including 20% to 30% by weight of BHET and a vacuum apparatus (32) that depressurizes the inside of the crystallizer (10), obtaining a slurry (13) including crystals of BHET in the crystallizer (10) by adiabatically cooling the aqueous solution by evaporating water which is a solvent of the aqueous solution; and a step of obtaining the crystals of BHET and a mother liquid by supplying the slurry (13) discharged from the crystallizer (10) to a solid-liquid separator (20).
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