A kind of preparation method of neopentyl glycol

A technology of neopentyl glycol and hydroxypivalaldehyde is applied in the preparation of organic compounds, chemical instruments and methods, preparation of hydroxy compounds, etc., and can solve the problems of reduced yield and purity of neopentyl glycol, cumbersome production process, and the like, Achieve the effect of improving selectivity, shortening process flow, and reducing saponification treatment steps

Active Publication Date: 2015-10-14
BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD +1
View PDF4 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that in the prior art, the ester substances contained in the catalytic hydrogenation product of hydroxypivalaldehyde are treated by saponification, which leads to a reduction in the yield and purity of neopentyl glycol, and the production process is cumbersome, and then provides a A method for producing neopentyl glycol with a simple process capable of simultaneously performing the catalytic hydrogenation of hydroxypivalaldehyde and the hydrogenolysis of by-product esters

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Use 5wt% NaOH solution and 10wt% KOH solution to adjust the pH value of the hydroxypivalaldehyde solution to 10.0. In the hydroxypivalaldehyde solution, in terms of mass percentage, the hydroxypivalaldehyde is 79wt%, and the water is 20wt%, the remainder is impurities;

[0028] (2) Using a fixed-bed reactor as a catalytic hydrogenation reactor, add the hydroxypivalaldehyde solution treated in step (1) into the fixed-bed reactor equipped with a nickel catalyst. 2 In the presence, the liquid space velocity of the hydroxypivalaldehyde solution is controlled to be 0.1h -1 , H 2 The gas space velocity is 300h -1 , reacting at a temperature of 110°C and a pressure of 2.0Mpa to obtain crude neopentyl glycol;

[0029] (3) The crude product of neopentyl glycol obtained in step (2) was subjected to vacuum distillation and purification at an absolute pressure of 0.02 MPa and a temperature of 180° C. to obtain neopentyl glycol.

[0030] After testing, during the operation p...

Embodiment 2

[0032] (1) With 10wt% Na 2 CO 3solution and 5wt% K 2 CO 3 The solution adjusts the pH value of the hydroxypivalaldehyde solution to 9.5. In the hydroxypivalaldehyde solution, in terms of mass percentage, the hydroxypivalaldehyde is 45wt%, water is 52wt%, and the balance is impurities, wherein the impurities include methanol , isobutyraldehyde, neopentyl glycol isobutyrate, triethylamine and other substances;

[0033] (2) Using a fixed-bed reactor as a catalytic hydrogenation reactor, add the hydroxypivalaldehyde solution treated in step (1) into the fixed-bed reactor equipped with a copper catalyst. 2 In the presence, the liquid space velocity of the hydroxypivalaldehyde solution is controlled to be 0.3h -1 , H 2 The gas space velocity is 300h -1 , reacting at a temperature of 120°C and a pressure of 3.5Mpa to obtain crude neopentyl glycol;

[0034] (3) Purify the crude product of neopentyl glycol obtained in step (2) by vacuum distillation under the conditions of an ab...

Embodiment 3

[0037] (1) Use 5wt% KOH solution to adjust the pH value of the hydroxypivalaldehyde solution to 9.0. In the hydroxypivalaldehyde solution, in terms of mass percentage, hydroxypivalaldehyde is 55wt%, methanol is 20wt%, and ether is 20wt% %, the remainder is impurities, wherein said impurities include methanol, isobutyraldehyde, hydroxyvaleric acid-neopentyl glycol ester, isobutyric acid neopentyl glycol ester;

[0038] (2) Using a fixed-bed reactor as a catalytic hydrogenation reactor, add the hydroxypivalaldehyde solution treated in step (1) into the fixed-bed reactor equipped with a copper catalyst. 2 In the presence, the liquid space velocity of the hydroxypivalaldehyde solution is controlled to be 0.5h -1 、H 2 The gas space velocity is 300h -1 , reacting at a temperature of 130°C and a pressure of 4.0Mpa to obtain crude neopentyl glycol;

[0039] (3) The crude product of neopentyl glycol obtained in step (2) is subjected to vacuum distillation and purification under the ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a method for preparing neopentyl glycol, which belongs to the technical field of alcohol preparation. The method includes the following steps: (1) adjusting the pH value of the hydroxypivalaldehyde solution to 7.5-10; (2) the hydroxypivalaldehyde treated in the step (1) is under the action of a hydrogenation catalyst at a temperature of 110-140°C, Under the condition of a pressure of 2.0-5.0Mpa, the crude product of neopentyl glycol is obtained by catalytic hydrogenation; (3) the crude product of neopentyl glycol obtained in step (2) is purified. The content of by-products such as esters in the crude neopentyl glycol prepared by the neopentyl glycol preparation method of the present invention is extremely low, and the yield and purity of the neopentyl glycol are improved. In addition, the hydroxypivalaldehyde raw material system can be directly used for catalytic hydrogenation without any treatment, which reduces the process steps of aldol condensation and catalytic hydrogenation to prepare neopentyl glycol, and improves production efficiency.

Description

technical field [0001] The invention relates to a method for preparing neopentyl glycol, in particular to a method for preparing neopentyl glycol by hydrogenation of hydroxypivalaldehyde, and belongs to the technical field of alcohol preparation. Background technique [0002] Neopentyl glycol (NPG, chemical name: 2,2-dimethyl-1,3-propanediol) is a stable diol. As an important fine chemical product, neopentyl glycol is mainly used in the production of unsaturated resins, polyester powder coatings, oil-free alkyd resins, polyurethane foams, synthetic plasticizers, surfactants, insulating materials, Printing inks, polymerization inhibitors, synthetic aviation lubricating oil additives, etc. [0003] The preparation methods of neopentyl glycol mainly include condensation hydrogenation method and disproportionation method, wherein, the research on the preparation of neopentyl glycol by condensation hydrogenation method began in the 1970s. The steps for preparing neopentyl glyco...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/20C07C29/141C07C29/149
Inventor 王振凡林科王庆明刘玉珍李春伟金凤迟徐蒋红赵新颖
Owner BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap