| 摘要 |
A process and an apparatus for the separation of a homogeneous catalyst solution from crude monoethylene glycol (MEG) and for purifying MEG is disclosed. The process comprises separating catalyst solution by evaporating crude MEG and feeding crude MEG to a rectification section, a stripping section, and thence to a pasteurisation section, each section operated at subatmospheric pressure of 0.5×105 Nm−2 or less, the rectification and pasteurisation sections being at pressure less than that of the catalyst separation section, wherein the process provides a pressure differential across the catalyst separation and rectification sections and wherein vapour phase crude MEG from the catalyst separation section is fed as substantially vapour phase feed to the rectification section. The apparatus comprises a catalyst separation section, an MEG rectification section, a stripping section and a pasteurisation section, wherein the MEG rectification and pasteurisation sections are located within a MEG purification column, and the catalyst separation section is either located in the MEG purification column or in a separate upstream vessel, and wherein the separation section provides a crude MEG feed inlet to the MEG rectification section and an outlet for separated catalyst, wherein the crude MEG feed inlet to the MEG rectification section is a vapour feed inlet. |
