Asynchronous switching three-zone-belt simulation moving bed
A simulated moving bed, asynchronous technology, applied in the field of separation engineering, can solve the problems of increasing the dead volume of the system, large solvent consumption, etc., and achieve the effect of improving utilization rate, product purity or processing capacity, and improving product purity
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[0023] Example 1. Asynchronous switching three-zone simulated moving bed separation of vanillin and syringaldehyde
[0024] Vanillin (4-hydroxy-3-methoxybenzaldehyde) is an important fragrance, which is widely used in the production of food, cosmetics and medicines. In the process of hydrolyzing lignin to produce vanillin, the product contains it The structural analog of syringaldehyde (4-hydroxy-3,5-dimethoxybenzaldehyde) is difficult to separate. The asynchronous switching three-zone simulated moving bed system of the present invention can be used for separation. The stationary phase uses 750μm C18 packing, packed into 4 preparative columns with an inner diameter of 1cm and a length of 15cm, and the mobile phase uses a 33% ethanol aqueous solution. Product analysis adopts 5μm C18 filler, 250mm×4.6mm analytical column, and the detection wavelength is 310nm.
[0025] Firstly, the adsorption isotherm of vanillin and syringaldehyde on C18 filler was determined by frontier analysis....
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