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Method for preparing fatty alcohol from fatty acid or fatty acid ester by selective hydrogenation

A fatty acid ester and fatty acid technology, applied in the field of catalytic hydrogenation, can solve problems such as poor catalyst reproducibility, many influencing factors of preparation methods, difficulty in unifying selectivity and conversion rate, etc., to reduce energy consumption and equipment investment, and to simplify the process The effect of green environmental protection and wide application prospect

Inactive Publication Date: 2015-02-25
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this catalyst is a good substitute of CuCr catalyst, the preparation method has many influencing factors, is not easy to control, and the catalyst has poor reproducibility
CN10129805A discloses a copper-zinc catalyst. The catalyst adopts a mesoporous molecular sieve and carries a certain amount of copper-zinc. However, the catalyst is used for the hydrogenation of fatty acid methyl esters. Although the selectivity is better, the conversion rate is slightly low, and the reaction pressure is between Above 12MPa
[0004] In general, so far, there are mainly problems in the preparation of fatty alcohols: CuCr catalysts are mainly used in industry, but the Cr emitted by CuCr catalysts during the preparation process 6+ caused serious pollution to the environment
Other catalysts have some disadvantages such as harsh reaction conditions, difficulty in unifying selectivity and conversion, and complicated reaction process.
The industry uses more hydrogenation of fatty alcohol methyl esters: it is the fatty acid methyl esters generated by transesterification of oil and methanol, and the fatty acid methyl esters are hydrogenated under the action of a catalyst to produce higher fatty acids; the conversion of oils requires A one-step transesterification step, lacking a reaction path for direct conversion of oil

Method used

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  • Method for preparing fatty alcohol from fatty acid or fatty acid ester by selective hydrogenation
  • Method for preparing fatty alcohol from fatty acid or fatty acid ester by selective hydrogenation
  • Method for preparing fatty alcohol from fatty acid or fatty acid ester by selective hydrogenation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The catalyst used in this example is a supported catalyst Ru-Sn / SiO 2 (Ru supporting amount: 5wt%, Sn supporting amount: 5wt%). The loading amount of Ru measured by ICP was 5.28wt%, the loading amount of Sn was 4.83wt%, and the specific surface was measured by nitrogen adsorption to be 243m 2 g -1 , the pore volume is 0.69cm 3 g -1 , see Table 1. figure 1 The transmission electron microscope picture in shows that the particle size of Ru-Sn is about 3nm, figure 2 The SEM image of the surface in the SiO 2 The particle size is 15±5nm. :

[0032] Preparation of Supported Catalyst Ru-Sn / SiO 2 Process: Prepared by the commonly used excessive impregnation method. For specific methods, see Catalyst Carrier Preparation and Application Technology, edited by Zhu Hongfa, Petroleum Industry Press, 2002 edition. Afterwards, the catalyst was calcined at 550° C. in an atmosphere of air for 4 hours, and then at 550° C. in an atmosphere of hydrogen for 4 hours.

[0033] Weigh ...

Embodiment 2

[0039] The catalyst Ru-Sn-Pt / C used in this example was determined by ICP. The Ru loading was 10.13wt%, the Sn loading was 5.08wt%, the Pt loading was 4.91wt%, and the surface area was 529m 2 g -1 , the pore volume is 0.26cm 3 g -1 , see Table 1.

[0040] Catalyst Ru-Sn-Pt / C is prepared by using the commonly used formaldehyde reduction method. For details, see the literature Carbohydrate Research, 2011, 346(11), 1327-1332.

[0041] Weigh 5.0g of palm oil and 1.0g Ru-Sn-Pt / C (Ru loading: 10wt%, Sn loading: 5wt%, Pt loading: 5wt%) and join in the autoclave, add Fill 80mL of dodecane with 3MPa hydrogen, raise the temperature to 220°C, and react for 6h. After the reaction was finished, it was naturally cooled to room temperature, and the liquid product was taken for GC-MS combined with GC quantitative and qualitative detection. GC results showed that the conversion rate of raw materials reached 95.71%, the selectivity of cetyl alcohol reached 35.28%, and the selectivity of st...

Embodiment 3

[0044] The catalyst Ru-Pt / diatomaceous earth used in this example is determined by ICP, the Ru loading is 9.85wt%, the Sn loading is 1.89wt%, and the surface area is 51m 2 g -1 , the pore volume is 0.48cm 3 g -1 , see Table 1.

[0045] The process of preparing supported catalyst Ru-Pt / diatomite: it is prepared by the commonly used excessive impregnation method. For specific methods, see Catalyst Support Preparation and Application Technology, edited by Zhu Hongfa, Petroleum Industry Press, 2002 edition. Afterwards, the catalyst was calcined at 550° C. in an atmosphere of air for 4 hours, and then at 550° C. in an atmosphere of hydrogen for 4 hours.

[0046] Weigh 2.0g of palmitic acid and 0.2g of Ru-Pt / diatomaceous earth (Ru loading: 10wt%, Pt loading: 2wt%, see Table 1) into the autoclave, add 80mL of water, Charge 4MPa of hydrogen, heat up to 200°C and react for 2h. After the reaction, it was naturally cooled to room temperature, and the product was extracted with ethyl...

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Abstract

The invention relates to a method for preparing fatty alcohol from fatty acid or fatty acid ester by selective hydrogenation. In a hydrogen atmosphere, fatty acid or fatty acid ester used as the raw material is subjected to a selective hydrogenation process in a solvent under the catalytic action of a supported catalyst to perform selective conversion, thereby obtaining the corresponding saturated fatty alcohol. In the method, the raw material conversion rate is up to higher than 90%, and the fatty alcohol selectivity is up to higher than 98%. The invention also relates to a supported catalyst for preparing fatty alcohol from fatty acid or fatty acid ester directly by selective hydrogenation. The method has the advantages of high conversion rate, high selectivity, favorable recovery performance of the catalytic system, simple and environment-friendly technique and the like, is suitable for industrial large-scale production, and has wide application prospects.

Description

technical field [0001] The invention relates to the technical field of catalytic hydrogenation, in particular to a method for preparing fatty alcohols from fatty acids or fatty acid esters through selective hydrogenation, and a supported method for preparing fatty alcohols through selective hydrogenation of fatty acids or fatty acid esters catalyst. Background technique [0002] Fatty alcohols are widely used in the production of chemical industry, light industry, agriculture and food industry because of their good biodegradability, good compoundability, high solubility and good low temperature resistance. For example, in the chemical industry, it can be used as a solvent and stabilizer in paints, vitamins, and cosmetics; in agriculture, it can be used as a plant production accelerator, seed germination insulation film, etc.; in the food industry, it can be used for food coating and preservation. It has a large amount and high added value, and plays an important role in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/125C07C29/149B01J23/62B01J23/46B01J23/89B01J29/03
CPCB01J23/464B01J23/626B01J29/0325B01J29/0352B01J2229/18C07C29/149C07C31/125Y02P20/50
Inventor 赵晨孔劼琛
Owner EAST CHINA NORMAL UNIV
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