Process for synthesizing 2-methyl-2,4-pentendiol through hydrogenation reduction of diacetone alcohol

Abstract

The invention relates to a process for synthesizing 2-methyl-2,4-pentendiol through hydrogenation reduction of diacetone alcohol, and belongs to the technical field of production processes of the 2-methyl-2,4-pentendiol. In the process, the diacetone alcohol is used as a raw material and is mixed with an aid, and then hydrogen is aerated under pressure under the action of a nickel catalyst to synthesize the 2-methyl-2,4-pentendiol through reduction replacement; and the aid is an alkaline compound, and the alkaline compound can be an alkaline inorganic compound or an alkaline organic compound which does not have a negative effect on hydrogenation reactions. By adding the aid, the disadvantages that the yield of products is low, more other byproducts are produced, the production cost is high, the process is difficult to operate, the separation of the products is difficult and the like existing in the conventional process are overcome, and other byproducts in the reduction process are reduced, so that the product yield of the synthesis of the 2-methyl-2,4-pentendiol is improved; and the purity of the 2-methyl-2,4-pentendiol is 99.5 percent, and the mass yield is improved to 99 percent. The process has the characteristics of simplicity, stable reaction, no pollution and the like, and is easy to operate.

Description

technical field [0001] The invention relates to a production process for synthesizing isohexanediol by hydrogenation reduction of diacetone alcohol, which belongs to the technical field of isohexanediol production process. Background technique [0002] Isohexanediol (MPD for short), Chinese name: 2-methyl-2,4-pentanediol, isohexanediol; [0003] Chinese aliases: hexanediol, hexenediol, hexanediol, α, α, α'-trimethyltrimethylene glycol, hexamethylene glycol; Α, Α, Α`-trimethyl trimethylene diol, dihydroxyhexane, MPD, (±)-2-methyl-2,4-pentanediol. [0004] Molecular Structure: [0005] [0006] Isohexanediol is a colorless transparent slightly viscous liquid with a slightly fresh sweet smell, soluble in water, alcohol, ether and lower aliphatic hydrocarbons. It is completely miscible with water, has strong solubility in high-grade organic solvents, and has good dispersion ability for organic matter. It is an environmentally friendly and safe solvent, penetrating agent an...

AI Technical Summary

Problems solved by technology

The first process uses highly active skeleton nickel as a catalyst, and hydrogenation reduction is performed under a pressure of 1.2-1.5 MPa. This method has the characteristics of simple process, stable reaction, easy operation, and no pollution. The purity of the product obtained by this process can reach 99%, but the product yield only reached 86%

The latter three methods not only have low yield, but also have disadvantages such as high production cost, difficult operation, and difficult product separation.

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