专利详情

专利名称	Method for preparing polyoxymethylene dimethyl ethers by acetalation reaction of formaldehyde with methanol
申请号	US201113164677	专利类型	US
公开（公告）号	US8987521(B2)	公开（授权）日	2015.03.24
申请（专利权）人	中国科学院兰州化学物理研究所	发明（设计）人	Xia Chungu;Song Heyuan;Chen Jing;Li Zhen
主分类号	C07C41/14	IPC主分类号	C07C41/14;C07C41/56;C07C41/58
专利有效期	Method for preparing polyoxymethylene dimethyl ethers by acetalation reaction of formaldehyde with methanol 至Method for preparing polyoxymethylene dimethyl ethers by acetalation reaction of formaldehyde with methanol	法律状态
说明书摘要	It is disclosed a method for preparing polyoxymethylene dimethyl ethers by continuous polymerization and acetalation reactions. The method may include two steps: performing a polymerization reaction of an aqueous formaldehyde solution under catalysis of an ionic liquid IL I to obtain a mixed aqueous solution of trioxymethylene and formaldehyde; and an acetalation reaction of the mixed aqueous solution of trioxymethylene and formaldehyde with methanol is performed under catalysis of an ionic liquid IL II to prepare polyoxymethylene dimethyl ethers. The method may use an aqueous formaldehyde solution as a starting material to prepare polyoxymethylene dimethyl ethers by continuous polymerization and acetalation reactions, achieving a high use ratio of formaldehyde. A film evaporator is used in the invention, realizing a rapid separation and recycling of the light components, with a high separation efficiency. The separation of the catalyst is simple, thereby realizing recycling of the catalyst.