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A kind of supported solid base catalyst and its preparation method and application

A solid base catalyst and supported technology, which is applied in the direction of chemical instruments and methods, preparation of organic compounds, physical/chemical process catalysts, etc., can solve the problems of low weight percentage of crude ester, high cost of purification and separation, etc., to improve product quality, Good selectivity and low energy consumption

Active Publication Date: 2020-08-07
广州美晨科技实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantages of its technology are: the weight percentage of crude ester is low, generally the weight percentage of monoglyceride fatty acid ester is 40-50%, and the high temperature reaction in the presence of alkali catalyst will cause glycerin to polymerize and generate impurities such as polyglycerol, so the purification The cost of separation is higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Heat, melt and filter 1000kg of stearic acid, and add 500kg of glycidol into the metering tank.

[0035] 2. Pump stearic acid into the reaction kettle, start stirring, add 1.5kg KF-SnCl 2 / Al 2 o 3Solid base catalyst, heated to 100 ° C, then slowly add glycidol to the reactor, and the feeding speed is controlled at 2.5kg / min.

[0036] Among them, KF-SnCl 2 / Al 2 o 3 The preparation method of solid base catalyst is:

[0037] (1) KF, SnCl 2 and Al 2 o 3 Add water at a weight ratio of 0.4:0.25:1;

[0038] (2) Stir and heat to 60°C, heat and stir for 30 minutes, stop stirring and heat preservation, and let stand for more than 8 hours;

[0039] (3) Filter the catalyst after standing to remove water, grind it into powder, and bake it at 500°C for 4 hours to get KF-SnCl 2 / Al 2 o 3 Supported solid base catalyst.

[0040] 3. After adding glycidol, keep warm for 4 hours to obtain crude ester; the weight percentage of monoglyceride fatty acid ester in the crude e...

Embodiment 2

[0051] 1. Heat, melt and filter 1000kg stearic acid. Add 400kg of glycidol to the metering tank.

[0052] 2. Pump stearic acid into the reaction kettle, start stirring, add 6kg KF-SnCl 2 / Al 2 o 3 Solid base catalyst, heated to 80°C, then slowly add glycidol to the reaction kettle, and the feeding speed is controlled at 1.5kg / min.

[0053] Among them, KF-SnCl 2 / Al 2 o 3 The preparation method of solid base catalyst is:

[0054] (1) KF, SnCl 2 and Al 2 o 3 Add water at a weight ratio of 0.5:0.2:1;

[0055] (2) Stir and heat to 60°C, heat and stir for 30 minutes, stop stirring and heat preservation, and let stand for more than 8 hours;

[0056] (3) Filter the catalyst after standing to remove water, grind it into powder, and bake it at 400°C for 6 hours to get KF-SnCl 2 / Al 2 o 3 Supported solid base catalyst.

[0057] 3. After adding glycidol, keep warm for 6 hours to obtain crude ester. The weight percentage of monoglyceride fatty acid ester in the crude ester...

Embodiment 3

[0068] 1. Heat, melt and filter 1000kg of palmitic acid. 285 kg of glycidol was added to the metering tank.

[0069] 2. Pump palmitic acid into the reaction kettle, start stirring, add 2kg KF-SnCl 2 / Al 2 o 3 Solid base catalyst, heated to 120°C, then slowly added glycidol to the reaction kettle, the feeding speed was controlled at 4kg / min.

[0070] Among them, KF-SnCl 2 / Al 2 o 3 The preparation method of solid base catalyst is:

[0071] (1) KF, SnCl 2 and Al 2 o 3 Add water at a weight ratio of 0.5:0.3:1;

[0072] (2) Stir and heat to 60°C, heat and stir for 30 minutes, stop stirring and heat preservation, and let stand for more than 8 hours;

[0073] (3) Filter the catalyst after standing to remove water, grind it into powder, and bake it at 600°C for 3 hours to get KF-SnCl 2 / Al 2 o 3 Supported solid base catalyst.

[0074] 3. After adding glycidol, keep warm for 3 hours to obtain crude ester. It can be seen from the test that the weight percentage of monog...

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PUM

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Abstract

The invention discloses a supported solid base catalyst as well as a preparation method and application thereof. In the invention, a KF-SnCl2 / Al2O3 supported solid base catalyst is adopted; glycidol and fatty acid react under certain conditions according to particular proportion to obtain coarse ester; then, three-level molecular distillation and purification is performed to obtain monoglycerin and diglycerin fatty acid ester products. The method reduces the reaction temperature and energy consumption, overcomes the problem of traditional technology that many impurities are generated since thefatty acid is easily decomposed and glycerin is easily polymerized in high-temperature reaction; coarse ester with high weight percentage of monoglycerin fatty acid ester is obtained, and difficultyin separation and purification is lowered; the monoglycerin fatty acid ester accounts for a remarkably high weight percentage of the final product, and industrial production can be carried out.

Description

technical field [0001] The invention relates to the field of fine chemical industry, in particular to a supported solid base catalyst and its preparation method and application. Background technique [0002] Food emulsifiers are the most widely used food additives in the food industry. At present, the amount of food emulsifiers used in the world exceeds 400,000 tons, and mono- and diglyceride fatty acid esters (referred to as monoglycerides) are the most used varieties of food emulsifiers. . my country's monoglyceride output has reached 100,000 tons, accounting for about 50% of food emulsifiers. Monoglyceride is a water-in-oil emulsifier. Due to its unique emulsifying properties, it can also be used as an oil-in-water emulsifier. The HLB value In 3~4, it is stipulated in the national standard GB2760 that it can be used in various foods according to production needs, and is "generally recognized as safe" (GRAS), the Food and Agriculture Organization of the United Nations and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/135C07C69/33C07C67/08C07C69/58
CPCY02E50/10
Inventor 胡道华郑自健张思源杨菁
Owner 广州美晨科技实业有限公司
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