- METHOD FOR PRODUCING HIGHER LINEAR FATTY ACIDS OR ESTERS
-
The present invention relates to a method of producing linear fatty acids comprising 7 to 28 carbon atoms or esters thereof using a combined biotechnological and chemical method. In particular, the present invention relates to a method of producing dodecanoic acid (i.e. lauric acid), via higher alkanones, preferably 6-undecanone.
- -
-
-
- Synthesis method of Guerbet acid
-
The invention discloses a synthesis method of Guerbet acid, and belongs to the technical field of chemical synthesis. The synthesis method comprises the following steps: adding long-chain saturated fatty acid ester, alkali and a solvent into a reaction kettle, slowly adding an alkylation reagent, heating to react, cooling, and carrying out reduced pressure distillation to remove the solvent, thereby obtaining dialkyl acetate; adding alcohol, water and a catalyst into the reaction kettle, heating for reaction, and performing reduced pressure distillation to remove the solvent; and adding waterinto the reaction kettle, adjusting the pH value of the system to 3-4, separating the liquid, dissolving the organic phase in petroleum ether, washing, decolorizing, and carrying out reduced pressuredistillation to obtain Guerbet acid. The method has few steps and is easy to operate and has low requirements on equipment; reaction selectivity is high, the conversion rate is high, impurities are few, and yield and purity are high; the main chain and branched chain structures of the product Guerbet acid can be flexibly regulated and controlled, and the raw materials are diversified; and the method is short in time consumption, less in generated waste, environment-friendly, safe and suitable for industrial production.
- -
-
Paragraph 0031-0035
(2020/07/02)
-
- Method for preparing Guerbet acids by taking malonate as raw material
-
The invention discloses a method for preparing Guerbet acids by taking malonate as a raw material. The method comprises the following steps: using the malonate as the raw material, and carrying out alkylation reaction under the action of alkali to obtain dialkyl malonate; sequentially carrying out hydrolysis reaction and decarboxylic reaction on obtained dialkyl malonate to obtain the Guerbet acid, wherein the malonate is dimethyl malonate or diethyl malonate; the alkali of the alkylation reaction is selected from one or more of potassium carbonate, sodium hydroxide, potassium hydroxide, sodium methylate and sodium ethoxide; an alkylating reagent is haloalkane with 2 to 20 carbons. According to the method disclosed by the invention, the Guerbet acids are prepared by taking the malonate as the raw material for the first time; related three reactions are easily operated, high temperature or high pressure is not needed, and high yield is realized; by means of the alkylation reaction disclosed by the invention, a main chain structure and a branched chain structure of the Guerbet acids can be flexibly regulated and controlled, and further the Guerbet acids with different properties are obtained.
- -
-
-
- Improved synthesis and low-temperature performance of a series of saturated α-branched fatty acids
-
Five saturated α-branched fatty acids, also known as Guerbet acids, including α-propylhexyl acid (G 1 ), α-butylhexyl acid (G 2 ), α-propyloctyl acid (G 3 ), α-butyloctyl acid (G 4 ), and α-hexyloctyl acid (G 5 ), were synthesized in high yields by four-step reaction. Colorless, almost odorless, and oily products were obtained with high purity, whose structures were confirmed by GC, 1H/13C NMR, and ESI-MS characterization. G 1, G 3, and G 4 had pour points lower than -60 °C, while G 2 and G 5 showed higher pour points (-42 °C and 6 °C, respectively) because of their molecular symmetry. Considering the low-temperature properties, G 1, G 3, G 4, and even G 2 held great potential applications in the lubricant and oilfield.
- Jiang, Yang,Hu, Wenjing,Xu, Jian,Li, Jiusheng
-
p. 2359 - 2363
(2017/10/06)
-