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

A technology of isohexanediol and diacetone alcohol, which is applied in the production process of isohexanediol, can solve problems such as difficult operation, difficult product separation, and high production cost, and achieve the effect of reducing unit consumption

Inactive Publication Date: 2012-01-25
荆州市宇鹏科技有限公司
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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 purit

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

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Embodiment Construction

[0025] A specific example of implementation is given below, but the technical solution protected by the present invention is not limited to this example.

[0026] Using 2000 L of diacetone alcohol as raw material hydrogenation reduction synthesis of isohexanediol, its specific process steps are:

[0027] Step 1: Start the vacuum pump to evacuate the raw material metering tank. When the vacuum is greater than -0.06Mpa, close the pumping valve, open the feeding valve, and mix 2000 L of diacetone alcohol raw material and 200ppm of sodium bicarbonate and pump it in. Raw material metering tank.

[0028] Step 2: Open the vacuum valve on the reduction pot, pump the reduction pot to a vacuum of -0.1Mpa, then open the feed valve on the reduction pot, and add 2000 L diacetone alcohol raw material and 200ppm sodium bicarbonate from the metering tank To reduction pot, start stirrer to stir simultaneously, add the Raney nickel catalyst of 95Kg.

[0029] Step 3: Close the vacuum valve, op...

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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...

Claims

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Application Information

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IPC IPC(8): C07C31/20C07C29/145C07C49/08C07C45/55
Inventor 严圣亮
Owner 荆州市宇鹏科技有限公司
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