Method for preparing trimethylolpropane through hydrogenation with high condensation yield

The invention provides a method for preparing trimethylolpropane (TMP) through hydrogenation with high condensation yield. The method comprises the following steps: reacting a high-concentration formaldehyde aqueous solution with n-butyraldehyde under the action of an organic amine catalyst to obtain a condensation reaction solution of 2, 2-dihydroxybutyraldehyde (DMB), and concentrating and directly hydrogenating the condensation reaction solution containing DMB to obtain TMP. By adopting the formaldehyde aqueous solution and controlling the structure and content of the organic amine catalyst, on one hand, disproportionation reaction of formaldehyde can be effectively controlled, equipment materials are reduced, and the formaldehyde utilization rate is increased; on the other hand, generation of intermediate products of 2-hydroxymethyl butyraldehyde (MMB) and 2-ethyl acrolein (EA) can be effectively controlled, and the yield of TMP is increased. 本发明提供一种高缩合收率加氢制备三羟甲基丙烷（TMP）的方法。该方法将高浓度甲醛水溶液和正丁醛在有机胺催化剂的作用下反应，得到