Preparation method used for preparing catalyst of polyglycerol and application thereof

Abstract

The invention discloses a preparation method used for preparing a catalyst of polyglycerol and application thereof, belonging to the technical filed of catalysts. The catalyst comprises at least a super basic material with alkali strength larger than 26 and a reductive phosphoric material. The preparation method comprises the following steps of taking gamma-Al2O3 as a carrier, dipping in a super-alkali solution, roasting, reacting with metallic Na for preparing the super basic material, and then mixing with the reductive phosphoric material to obtain the catalyst. The catalyst is used for polymerization reaction of glycerol and preparing the polyglycerol with light color and polymerization degree ranging from 2-20, and has the advantages of high catalytic activity, short reaction time, and high application value.

Description

technical field [0001] The invention belongs to a preparation method and application of a catalyst composition, in particular to a preparation method and application of a catalyst used for glycerin polymerization to prepare polyglycerol, and belongs to the technical field of catalysts. Background technique [0002] Polyglycerol belongs to polyhydroxy ether organic compounds, which can be used as humectants, tackifiers, plasticizers and hydrophilic modifiers, and is also an intermediate for the preparation of polyglycerol fatty acid ester surfactants. Polyglycerol is formed by intermolecular polymerization of glycerol or glycidol under the action of heating and catalysts. As far as the industrial preparation of polyglycerol is concerned, the following methods are known: [0003] (1) A method of recovering from the distillation residue of glycerin. [0004] (2) The method of dehydration polymerization with glycerol under the action of a catalyst. [0005] (3) Direct polymeri...

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Problems solved by technology

[0007] From an economic point of view, the preparation of polyglycerol with a large degree of polymerization is still the method of dehydration polymerization of glycerol under the action of a catalyst, and the catalysts used are mostly common alkaline substances, such as KOH, NaOH, K 2 CO 3 and Na 2 CO 3 Etc., as the degree of polymerization of the polyglycerin produced increases, the color of the product changes from yellow to dark brown, even black, and the smell becomes stronger and stronger, which cannot meet the quality requirements of the application.

[0008] In order to overcome the shortcomings of the above-mentioned catalysts, U.S. Patent No. 4,551,561 discloses a phosphate catalyst. Although the color of polyglycerol is obviously improved, the reaction speed is too slow to make the method uneconomical.

[0009] European Patent No. 732,318 discloses a metaaluminate catalyst, which can improve the color of polyglycerol and shorten the reaction time, but the polymerization activity is low, and only 2 to 3 polyglycerols can be prepared.

[0010] In view of the above-mentioned status quo, a catalyst for polyglycerol with high catalytic activity, short reaction time, and light color of polyglycerol with a degree of polymerization of 2 to 20 has not been found yet.