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Production process of neopentyl glycol

A neopentyl glycol, production process technology, applied in the preparation of organic compounds, separation/purification of hydroxyl compounds, carbon-based compound preparation, etc., can solve the problems of high product prices, large differences, dark gray or gray color, etc. Achieve the effects of accelerated hydrogenation reaction rate, low equipment requirements, and low production costs

Inactive Publication Date: 2017-11-03
HENGYANG YISHUN CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages: large investment in hydrogenation process, high requirements on external environment, high product price;
Disadvantage: low purity compared to hydrogenation process
The difference between the by-product sodium formate and the methanol method is relatively large, the color is dark gray or gray, and the purity is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The preparation method of neopentyl glycol:

[0031] (1) Mix formaldehyde, isobutyraldehyde and triethylamine at a molar ratio of 1.3:1.2:0.2, and condense for 3 hours at a temperature of 80°C and a pressure of 1.5MPa to obtain a hydroxyvaleraldehyde solution;

[0032] (2) add methyl alcohol and catalyzer in the hydroxyvaleraldehyde solution gained in (1), the addition of formaldehyde is 15% of the hydroxyvaleraldehyde solution weight, the addition of catalyzer is 3% of the hydroxyvaleraldehyde solution weight, at temperature Hydrogenation reaction at 150°C and pressure of 10MPa for 2h to obtain neopentyl glycol solution;

[0033] (3) The neopentyl glycol solution obtained in (2) is purified to obtain the neopentyl glycol finished product.

[0034] Purification method of neopentyl glycol solution:

[0035] (1) The neopentyl glycol solution of gained is extracted with the petroleum ether of 15% of neopentyl glycol solution weight, obtains neopentyl glycol crude product...

Embodiment 2

[0039] The preparation method of neopentyl glycol:

[0040] (1) Mix formaldehyde, isobutyraldehyde and triethylamine at a molar ratio of 1:1:0.1, and condense for 2 hours at a temperature of 75°C and a pressure of 1 MPa to obtain a hydroxyvaleraldehyde solution;

[0041] (2) add methyl alcohol and catalyzer in the hydroxyvaleraldehyde solution gained in (1), the addition of formaldehyde is 15% of the hydroxyvaleraldehyde solution weight, the addition of catalyzer is 3% of the hydroxyvaleraldehyde solution weight, at temperature Hydrogenation at 130°C and pressure of 8 MPa for 1 hour to obtain neopentyl glycol solution;

[0042] (3) The neopentyl glycol solution obtained in (2) is purified to obtain the neopentyl glycol finished product.

[0043] Purification method of neopentyl glycol solution:

[0044] (1) The neopentyl glycol solution of gained is extracted with the petroleum ether of 15% of neopentyl glycol solution weight, obtains neopentyl glycol crude product;

[0045...

Embodiment 3

[0048] The preparation method of neopentyl glycol:

[0049] (1) Mix formaldehyde, isobutyraldehyde and triethylamine at a molar ratio of 1:1:0.2, and condense for 2 hours at a temperature of 65°C and a pressure of 0.5MPa to obtain a hydroxyvaleraldehyde solution;

[0050] (2) add methyl alcohol and catalyzer in the hydroxyvaleraldehyde solution gained in (1), the addition of formaldehyde is 15% of the hydroxyvaleraldehyde solution weight, the addition of catalyzer is 3% of the hydroxyvaleraldehyde solution weight, at temperature Hydrogenation at 100°C and pressure of 2 MPa for 1 hour to obtain neopentyl glycol solution;

[0051] (3) The neopentyl glycol solution obtained in (2) is purified to obtain the neopentyl glycol finished product.

[0052] Purification method of neopentyl glycol solution:

[0053] (1) The neopentyl glycol solution of gained is extracted with the petroleum ether of 15% of neopentyl glycol solution weight, obtains neopentyl glycol crude product;

[005...

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Abstract

The invention relates to a production process of neopentyl glycol. The production process comprises the following steps: (1) mixing formaldehyde, isobutyraldehyde and triethylamine and performing condensation reaction to obtain a hydroxypentaldehyde solution; (2) adding methanol and a catalyst into the hydroxypentaldehyde solution obtained in the step (1) and performing hydrogenation reaction to obtain a neopentyl glycol solution; (3) purifying the neopentyl glycol solution obtained in the step (2) to obtain a neopentyl glycol finished product, wherein the catalyst in the step (2) is a molybdenum and chromium-modified active copper catalyst. The purifying method in the step (3) comprises the following steps: extraction, reduced-pressure distillation twice, gasification and condensation-crystallization. The production process of the neopentyl glycol, provided by the invention, has the benefits that less wastewater is produced, the requirements for equipment are low, the production cost is low, the production process is short, and the product purity can reach 99.7 percent.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a production process of neopentyl glycol. Background technique [0002] Neopentyl glycol, molecular formula C 5 h 12 o 2 , organic compounds, often used in the synthetic production process of chemical fibers, coatings, lubricants, etc. [0003] Mainly used in the production of unsaturated resins, polyester powder coatings, oil-free alkyd resins, polyurethane foams, plasticizers for elastomers, synthetic plasticizers, surfactants, insulating materials, printing inks, polymerization inhibitors additives, synthetic aviation lubricating oil additives, etc. In addition, it is also used in the pharmaceutical industry. At the same time, neopentyl glycol is also an excellent solvent and can be used for the selective separation of aromatics and cycloalkyl hydrocarbons. [0004] Internationally, there are three main schools of neopentyl glycol production: [0005] Hydrog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/141C07C29/76C07C31/20
CPCC07C29/141C07C29/76C07C45/75C07C31/20C07C47/19
Inventor 罗秋
Owner HENGYANG YISHUN CHEM CO LTD
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