Method for removing propyl propionate in process for preparing normal propyl alcohol by hydrogenating propionaldehyde
A kind of technology of propyl propionate and propyl propionate, which is applied in the field of removing propyl propionate in the process of preparing n-propanol by hydrogenation of propionaldehyde, and can solve the light component that is not shown to be removed, namely the treatment method of head oil and other problems, to achieve the effect of reducing energy consumption, increasing output, and simple process
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Embodiment 1
[0015] Example 1: The water-containing propionaldehyde from the ethylene hydroformylation unit is mixed with hydrogen, and after being gasified, it passes through a tar trap, removes the oil in the reaction gas, and then enters the fixed-bed reactor from the bottom. The inlet temperature is 110~130°C, and the reaction pressure is 0.4 ~0.6MPa, the hydrogenation reaction is carried out under the action of a copper-based catalyst. This reaction is an exothermic reaction. The heat generated by the reaction is taken away by the heat transfer oil to keep the temperature of the hot spot of the reaction at 160~195°C. The material from the top of the reactor is condensed by the condenser to 30~50°C and sent to the separation tank, where the separation of crude propanol and unreacted hydrogen is realized. After the unreacted hydrogen leaves the separation tank, part of it directly enters the hydrogen compressor for pressurization and recycling, and the other part is purified by pressur...
Embodiment 2
[0017] Example 2: The source of crude propanol is the same as in Example 1, except that the content of propyl propionate in crude propanol is 1%.
[0018] The crude propanol is degreased according to the method of the present invention below, the crude propanol and sodium oxide are added to the hydrolysis kettle, the sodium hydroxide concentration formed after the sodium oxide reaction is about 40%, and the sodium hydroxide and propyl propionate mol ratio is 1.6:1, heat and stir the hydrolysis tank, and continue to distill, the temperature of the tank is controlled at 115°C, the temperature of the distillation tower top is at 92°C, and the propyl propionate in the crude propanol undergoes hydrolysis reaction under alkaline conditions to form propionic acid Sodium, the overhead fraction n-propanol is condensed and dehydrated to obtain high-purity n-propanol products. The content of propyl propionate in the final product n-propanol is 0.08%, and the purity of n-propanol is 99....
Embodiment 3
[0019] Example 3: The source of crude propanol is the same as in Example 1, except that the content of propyl propionate in crude propanol is 1.8%.
[0020] The crude propanol is degreased according to the method of the present invention below, the crude propanol and potassium oxide are added to the hydrolysis kettle, the potassium hydroxide formed after the potassium oxide reaction is a saturated solution, and the potassium hydroxide and propyl propionate mol ratio are 1: 1. Heat and stir the hydrolysis tank, and continue to distill. The temperature of the tank is controlled at 110°C, and the temperature at the top of the distillation tower is at 94°C. The propyl propionate in the crude propanol is hydrolyzed under alkaline conditions to form potassium propionate. The n-propanol in the overhead fraction undergoes condensation and dehydration processes to obtain high-purity n-propanol products. The content of propyl propionate in the final product n-propanol is 0.05%, and th...
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