Process for preparing high-purity molecular distillation monoacylglycerol

Abstract

The invention relates to a process for synthesizing high-purity molecular distillation monoacylglycerol. The process comprises the following steps of: (1) mixing glycerol and a catalyst A, vacuumizing, stirring for heating, adding hydrogenated oil added with a catalyst B into a reaction system in batches to perform ester exchange reaction, after the ester exchange reaction is finished, keeping temperature, adding phosphoric acid for neutralizing, cooling and standing a reactant for demixing, wherein an upper layer is a crude glyceride layer, a lower layer is materials which are not reacted completely and impurities generated in the reaction process; (2) dehydrating and degassing the crude glyceride layer by primary distillation; (3) performing secondary distillation on the product, and removing free fatty acid and excessive glycerol; and (4) performing third-level distillation on the product to obtain a distillment and a distillation remnant, wherein the distillment is the high-purity molecular distillation monoacylglycerol, and the distillation remnant is diglyceride and triglyceride. By the process, the content of total monoester in crude ester can be improved obviously, the abrasion of equipment in subsequent molecular distillation process is reduced, the energy consumption of distillation is reduced, and the economic benefit is improved obviously.

Description

technical field [0001] The invention belongs to the field of preparation of food emulsifiers, and in particular relates to a novel energy-saving and consumption-reducing preparation process of molecular distillation monoglycerol (fatty monoacylglycerol). Background technique [0002] Monoglyceride is a widely used non-ionic emulsifier. As an excellent W / O emulsifier, it has good emulsifying, soft, antistatic and lubricating effects, and is widely used in daily chemical / food / medicine / Textile / polymer materials and other fields. In the food industry, monoglyceride is an important food emulsifier, and its consumption accounts for 2 / 3 of the total consumption of food emulsifiers. It is also widely used in other non-food industries. For example, in the polymer industry, monoglycerides can be used in cutting oil emulsifiers, textile softeners, lubricants, EPS, PE, PP, thermosetting resin plastics, and printing inks. Because of its excellent solubility in PVC, it is used as an i...

AI Technical Summary

Problems solved by technology

[0007] The main disadvantages of the existing molecular distillation monoglyceride production process are: (1) The transesterification reaction is an equilibrium reaction, and due to the poor solubility of glycerol in hydrogenated oil, the monoglyceride content in the crude product is only 35-40%, which is very low. Difficult to break through 60%

On this basis, using molecular distillation to obtain high-purity (>95%) monoglycerides generally requires 3 tons of 40% monoglyceride raw materials to obtain 1 ton of high-purity monoglycerides. The distillation device requires ultra-high vacuum (1~0.5Pa), consumes a lot of energy (about 200°C), and the scraping film of the equipment is easy to wear. Therefore, under the traditional process, the equipment loss is serious and the economic benefit is poor

(2) In order to increase the total monoester content in the crude ester, the original process often increases the proportion of glycerin in the system, but the excess glycerin is prone to polymerization in the presence of a basic catalyst, and it is difficult to distill it out in the subsequent distillation process. Residues in di- and tri-glycerides cannot be returned to the reaction system, and the utilization rate is low, which reduces the economic benefits of the enterprise

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