The Study Of The New Solid Base And Its Application In The Synthesis Of Choline Chloride

Choline chloride is a very important feed nutritional additives. Compared tohomogeneous base catalyst, solid base catalyst has an advantage of avoidance ofcorrosive equipment, environmental pollution and product separation difficulties in theproduction process of choline chloride. At present, less research about the processusing a solid base as catalyst was conducted in the industrial production of cholinechloride. Therefore, more and more attention has been paid to the process ofsynthesizing choline chloride by solid base catalyst.Supported solid base is the largest inorganic solid base catalyst in today’sresearch. Common carriers are activated carbon, alumina, molecular sieves, etc.Common precursors are nitrates, hydroxides, and carbonates. Activated carbon is anamorphous carbon from the graphite-like crystallites of different sizes formed. Due toits low price, stability, large surface area, rich pore structure and adjustable surfacechemistry, it becomes a promising catalyst carrier in catalytic reactions. It has beenmore widely used. When the organic metal compound as a precursor, the higheractivity of the catalyst can be prepared. The activated carbon was chosen as the carrier,and the magnesium acetate was chosen as the precursor. In this paper, the supportedcatalyst was prepared and developed for the synthesis of choline chloride.In this paper, both preparation conditions and synthesis process for cholinechloride were studied. To seek a new process of choline chloride preparation, theoptimal synthesis conditions were selected and the reaction mechanism was studied bycomparison of conversion and the yield of products. The main research work andconclusions are as follows.1.The activities of organic solid base, organic and inorganic solid base, oxideeigen solid base and load type solid base were investigated in detail in the process ofsynthesis of MgO/AC catalyst. The magnesium acetate was chosen as the precursor,andthe activated carbon was chosen as the carrier. Then the supported catalyst MgO/ACwas prepared in this paper. 2. According to the yield of choline chloride, the optimum reaction conditions ofMgO/AC catalyst preparation are as follows: magnesium acetate concentration40%，impregnation time10h，calcination temperature250℃,calcination time3h.This method showed some of features including easy operation and mild reactioncondition, and so on.3. Catalyst’s activity is evaluated according to the reaction of synthesizing cholinechloride from ethylene oxide catalyzed by MgO/AC.And factors such as the content ofcatalyst,raw material ratio, reaction temperature, reaction time were studied in detail.4. The catalytic reaction products were qualitatively analyzed by infraredspectrometer(IR), and the objective product choline chloride was confirmedgenerated.The reaction products of synthesis of choline chloride were quantitativeanalyzed, and composition of the by-products were identified by the redwood saltgravimetric method.5. The201x7strong base anion exchange resin was applied in synthesizingcholine chloride. In a flask reactor, ethylene oxide conversion and choline chlorideselectivity reach to99.53%and98.28%, so its yield could be98.25%. The relevant dataof conversion and selectivity show that such activated resin is more suitable for cholinechloride industrial production.