Method for preparing fatty alcohol through fixed bed hydrogenation by using fatty acid methyl ester

A technology of fatty acid methyl ester and fixed bed, which is applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., to achieve the effects of inhibiting the formation of cyclic polymers and alkanes, stabilizing operating temperature, and saving heating costs

Inactive Publication Date: 2010-01-27
上海中远化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The object of the present invention is to provide a method for producing fatty alcohols that overcomes the shortcoming that an adiabatic reactor cannot perform heat exchange, can not only increase the yield of reactants, but also achieve the purpose of effectively saving energy and improving the safety of reaction equipment

Method used

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  • Method for preparing fatty alcohol through fixed bed hydrogenation by using fatty acid methyl ester

Examples

Experimental program
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Embodiment 1

[0024] Methyl n-octanoate with an acid value of 0.70% KOHmg / g and methanol with a purity of 99.81 wt % are mixed into a mixed solution in a volume ratio of 9:1, and the mixed solution is pressurized to 20-25 MPa with a high-pressure pump [1], It is sent to the heat exchanger [2] to be preheated to 180-190 °C. In the heat exchanger [2], the mixed liquid is mixed with the circulating hydrogen separated by the high pressure cyclone from the hydrogenation reactor B[5], and the hydrogen is mixed with fatty acid methyl alcohol. The molar ratio of the ester is 120:1, and the formed two-phase mixture is sent to the heater [3] and heated to 205 to 225° C. After being heated to 205 to 225° C., a composite catalyst of copper oxide and zinc oxide is installed, wherein CuO: Zno=9: 1 (weight). ratio), the top of the circular capsule-shaped fixed-bed hydrogenation reactor A[4] with a particle size of Φ6×6mm enters, and flows through the composite catalyst fixed bed from top to bottom. For 0....

Embodiment 2

[0026] Methyl n-octanoate with an acid value of 0.73% KOHmg / g and methanol with a purity of 99.85% by weight are mixed into a mixed solution in a volume ratio of 12:1, and the mixed solution is pressurized to 20-25MPa with a high-pressure pump [1], It is sent to the heat exchanger [2] to be preheated to 180-190 °C. In the heat exchanger [2], the mixed liquid is mixed with the circulating hydrogen separated by the high pressure cyclone from the hydrogenation reactor B[5], and the hydrogen is mixed with fatty acid methyl alcohol. The molar ratio of the ester is 150:1, and the formed two-phase mixture is sent to the heater [3] and heated to 205 to 225 ° C, and then a composite catalyst of copper oxide and zinc oxide is installed, wherein CuO: Zno=9: 1 (weight). ratio), the top of the circular capsule-shaped fixed-bed hydrogenation reactor A[4] with a particle size of Φ6×6mm enters, and flows through the composite catalyst fixed bed from top to bottom. For 0.1 to 2 hours, the reac...

Embodiment 3

[0028] Use methyl laurate to replace methyl n-octanoate, other conditions and operations are the same as in Example 1, the purity of the obtained lauryl alcohol is 99.6% by weight, and the yield of methyl laurate is 97.0%

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Abstract

The invention provides a method for preparing fatty alcohol through fixed bed hydrogenation by using fatty acid methyl ester, which overcomes the defect that an adiabatic reactor cannot perform heat exchange, has no need of changing the prior device and process, and has the advantages of saving energy and improving the safety of a reaction device. The method comprises the following steps: adding methanol of which the purity is more than or equal to 99.8 weight percent into the fatty acid methyl ester of which the acid value (AV) is less than or equal to 0.8 percent of KOHmg/g, wherein the volume ratio of the fatty acid methyl ester to the methanol is 8-12:1; and using the methanol to release and absorb reaction heat in the process so that the temperature of a fixed bed catalytic hydrogenation reactor is kept relatively constant and side reactions are reduced. The reactants can be fatty acid methyl esters of C8-C18, such as methyl esterification products and the like of natural coconut oil, palm oil and palm nut oil. The fatty acid methyl ester can be obtained through the alcoholysis of the fatty acid and can also be obtained from markets, and the purity of the obtained fatty alcohol is more than 99.7 percent. The yield of the fatty acid methyl ester is more than 96 percent.

Description

technical field [0001] The invention relates to a method for producing fatty alcohol, in particular to a method for preparing fatty alcohol by fixed bed hydrogenation of fatty acid methyl esters. Background technique [0002] Fatty alcohols, also known as higher alcohols, refer to mixtures of monohydric alcohols containing more than six carbon atoms. usually put C 6 ~C 10 range of alcohols are called plasticizer alcohols, while the C 12 The above alcohols are called detergent alcohols. In the early days, animal and vegetable oils were used as raw materials, and in the 1960s, after switching to the route of using petroleum as the main raw material, the output increased year by year. In the mid-1980s, the total output reached more than 5Mt, of which synthetic production accounted for about 65%. Higher fatty alcohols are mainly made into various ester products and used as polymer plasticizers such as rubber and plastics, as well as detergents, especially ethoxy compounds o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/136C07C31/125C07C33/02
Inventor 庄晓伟
Owner 上海中远化工有限公司
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