Method for preparing neopentyl glycol

A technology of neopentyl glycol and hydroxyvaleraldehyde is applied in the reduction and preparation of oxygen-containing functional groups, the separation/purification of hydroxyl compounds, and organic chemistry. The effect of reducing dosage and energy consumption, good product quality and appearance, and small amount of waste water

Inactive Publication Date: 2010-10-20
ZIBO MINGXIN CHEM
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

In 2008, my country's neopentyl glycol output increased to about 66,000 tons, but it was still unable to meet market demand and still needed to be imported
[0004] The neopentyl glycol sodium formate production process can produce a large amount of waste water and poor quality sodium formate, which cannot be compared with the condensation hydrogenation process in terms of product quality, economic indicators and environmental protection requirements
Although the new synthetic diol produced by condensation hydrogenation method has good quality, high yield and less pollution, but the country has not formed its own patented technology and has not broken the monopoly of foreign companies

Method used

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  • Method for preparing neopentyl glycol

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Effect test

Embodiment 1

[0021] According to the molar ratio of isobutyraldehyde (IBD): formaldehyde (FBD): trimethylamine (TMA) = 1.0: 1.2: 0.05, the 10-liter stainless steel reactor is filled with nitrogen, and the formaldehyde solution and trimethylamine are first added to the reactor During the process, the temperature was uniformly raised to 60°C, and then began to continuously add isobutyraldehyde for 0.20 hours. After the addition of isobutyraldehyde was completed, the isobutyraldehyde and formaldehyde were condensed and reacted for 1.5 hours at a temperature of 69°C and a pressure of 0.3MPa. , to obtain a solution dissolved with hydroxyvaleraldehyde; the solution prepared above was subjected to vacuum distillation for 1 hour under the conditions of a temperature of 70° C. and a pressure of -0.095 MPa to obtain a concentrated solution of hydroxyvaleraldehyde; 10% by weight of anhydrous methanol is then transported to a 10-liter tubular high-pressure reactor at a rate of 0.1 liters / minute, and hy...

Embodiment 2

[0023] According to the molar ratio of isobutyraldehyde (IBD): formaldehyde (FBD): trimethylamine (TMA) = 1.0: 1.0: 0.02, the 10-liter stainless steel reactor is filled with nitrogen, and the formaldehyde solution and trimethylamine are first added to the reactor During the process, the temperature was evenly raised to 60°C, and then began to continuously add isobutyraldehyde for 0.25 hours. After the addition of isobutyraldehyde was completed, the isobutyraldehyde and formaldehyde were condensed and reacted for 2.5 hours at a temperature of 60°C and a pressure of 1.0 MPa. , to obtain a solution dissolved with hydroxyvaleraldehyde; the solution prepared above was subjected to vacuum distillation for 1 hour under the conditions of a temperature of 85° C. and a pressure of -0.05 MPa to obtain a concentrated solution of hydroxyvaleraldehyde; 1% by weight of anhydrous methanol is then transported to a 10-liter tubular high-pressure reactor at a rate of 0.07 liters / minute, and hydro...

Embodiment 3

[0025] According to the molar ratio of isobutyraldehyde (IBD): formaldehyde (FBD): trimethylamine (TMA) = 1.0: 1.28: 0.2, fill the 10-liter stainless steel reactor with nitrogen, and first add the formaldehyde solution and trimethylamine to the reactor During the period, the temperature was evenly raised to 60°C, and then began to continuously add isobutyraldehyde for 0.1 hour. After the addition of isobutyraldehyde was completed, the isobutyraldehyde and formaldehyde were condensed and reacted for 1 hour at a temperature of 85°C and a pressure of 1.0 MPa. , to obtain a solution dissolved with hydroxyvaleraldehyde; the solution prepared above was subjected to vacuum distillation for 1 hour under the conditions of a temperature of 73°C and a pressure of -0.08MPa to obtain a concentrated solution of hydroxyvaleraldehyde; 5% by weight of anhydrous methanol is then transported to a 10-liter tubular high-pressure reactor at a rate of 0.05 liters / minute, and hydrogenated in the prese...

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Abstract

The invention discloses a method for preparing neopentyl glycol, which comprises the following steps of: (1) mixing aqueous solution of formaldehyde, isobutyraldehyde and a catalyst, and performing a condensation reaction on the isobutyraldehyde and formaldehyde under the protection of inert gases to obtain solution in which hydroxypentanal is dissolved; (2) distilling the solution prepared by the step (1) under reduced pressure to obtain concentrated solution of the hydroxypentanal; (3) adding absolute methanol and a copper-based catalyst into the concentrated solution, and hydrogenating thehydroxypentanal to obtain a mixture containing neopentyl glycol; (4) purifying the mixture prepared by the step (3) to obtain neopentyl glycol solution; (5) distilling the neopentyl glycol solution prepared by the step (4) under the reduced pressure to obtain a neopentyl glycol crude product; and (6) heating the neopentyl glycol crude product to obtain gaseous neopentyl glycol, and condensing thegaseous neopentyl glycol to obtain the target product. The method has the advantages of small amount of waste water generated, high quality and yield of products, and low energy consumption.

Description

technical field [0001] The present invention relates to the preparation method of neopentyl glycol. Background technique [0002] Neopentyl glycol (2,2-dimethyl-1,3-propanediol, Neo, or NPG), mainly used in the production of saturated polyester resins, unsaturated polyester resins, polyester polyols and synthetic lubricants Esters, polymer plasticizers and alkyd resins, etc., and their derivatives are widely used in the fields of coatings, automobiles, textiles, pesticides, plastics and petroleum. Saturated polyester resin produced from neopentyl glycol, its unique neopentyl structure makes powder coatings and high-solid coatings prepared from it have excellent fluidity, flexibility, chemical stability, and weather resistance performance, chlorine resistance, thermal stability and resistance to ultraviolet radiation. With the strengthening of people's awareness of environmental protection, the rapid development of environmental protection coatings such as powder coatings a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/20C07C29/14C07C29/76
Inventor 魏传明江津河许凤杰刘家强
Owner ZIBO MINGXIN CHEM
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