摘要:
Processes for producing polytrimethylene ether glycol and copolymers thereof are provided wherein, by condensing and recycling at least a portion of the vapor phase produced as the reaction progresses, the yield loss and polymer color are reduced.
摘要:
Processes for reducing the color of polytrimethylene ether glycol or copolymers thereof are provided. The processes include polycondensing diols in the presence of an acid catalyst and adding base continuously over a period of the polycondensation reaction. The invention also relates to the polytrimethylene ether glycol thereof produced by these processes.
摘要:
This invention relates to a temperature adjustment device that executes an absorption cooling or heating cycle in which a lithium halide, typically a lithium bromide, absorbent is used.
摘要:
This invention relates to a process for preparing polytrimethylene ether glycols or copolymers thereof having a number-average molecular weight of at least about 250 g/mole by a polycondensation reaction using at least one acid catalyst.
摘要:
Processes for reducing the color of polytrimethylene ether glycol or copolymers thereof are provided. The processes include polycondensing diols in the presence of an acid catalyst and adding base continuously over a period of the polycondensation reaction. The invention also relates to the polytrimethylene ether glycol thereof produced by these processes.
摘要:
This invention relates to a temperature adjustment device that executes an absorption cooling or heating cycle in which a lithium halide, typically a lithium bromide, absorbent is used.
摘要:
Processes for producing polytrimethylene ether glycol and copolymers thereof are provided wherein, by condensing and recycling at least a portion of the vapor phase produced as the reaction progresses, the yield loss and polymer color are reduced.
摘要:
This invention relates to a process for preparing polytrimethylene ether glycols or copolymers thereof having a number-average molecular weight of at least about 250 g/mole by a polycondensation reaction using at least one acid catalyst.