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Method for continuously producing neopentyl glycol

A technology of neopentyl glycol and hydroxypivalaldehyde, applied in chemical instruments and methods, preparation of organic compounds, preparation of aldehyde redox, etc., can solve the problems of strict process conditions, many side reaction products, and adverse effects of HPA continuous process and other problems to achieve the effect of ensuring stable operation, reducing the generation of by-products, improving the conversion rate and product quality and yield

Active Publication Date: 2018-10-09
LIHUAYI GROUP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The object of the present invention is to provide a kind of method of continuous production neopentyl glycol, to solve prior art in HPA synthesis and hydrogenation process side reaction product is many, process condition is strict, and the instability of HPA is to continuous process Adverse effects and other problems, the method converts the intermediate product HPA into more stable hydroxypivalic acid neopentyl glycol monoester (HPNE), and finally HPNE is hydrogenated into NPG

Method used

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  • Method for continuously producing neopentyl glycol
  • Method for continuously producing neopentyl glycol
  • Method for continuously producing neopentyl glycol

Examples

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Embodiment 1

[0027] A method for continuous production of neopentyl glycol, comprising the steps of:

[0028] 1. Mix isobutyraldehyde, formaldehyde and triethylamine in a molar ratio of 1:0.8:0.01, add them into the reactor, and carry out condensation reaction at a temperature of 70°C and a pressure of 80kPa.

[0029] 2. Pass the resulting mixed solution into a tank containing Mg(OH) 2 The catalyst is condensed in a fixed-bed reactor, and the resulting solution containing 80% wtHPNE is passed into a storage tank.

[0030] 3. Use the feed pump to send the HPNE solution into the reflux reactor containing NPG, the catalyst is Raney nickel (the nickel content in the catalyst is 80%wt), and the hydrogenation reaction is carried out at 150 ° C and 6 MPa until the circulating liquid NPG content 98%wt.

[0031] 4. The reaction product is separated by a cross-flow filter, the mass ratio of the circulating liquid and the clear liquid of the filter is controlled at 80, the circulating liquid contai...

Embodiment 2

[0033] A method for continuous production of neopentyl glycol, comprising the steps of:

[0034] 1. Formaldehyde, isobutyraldehyde and triethylamine are mixed and added into the reactor at a molar ratio of 1:1:0.03, and the condensation reaction is carried out at a temperature of 50°C and a pressure of 60kPa.

[0035] 2. Pass the resulting mixed solution into a Ca(OH) 2 The catalyst is condensed in a fixed-bed reactor, and the resulting solution containing 75% wtHPNE is passed into a storage tank.

[0036] 3. Use the feed pump to send the HPNE solution into the reflux reactor containing NPG, the catalyst is Raney nickel (the nickel content in the catalyst is 75%wt), and the hydrogenation reaction is carried out at 180 ° C and 10 MPa until the circulating liquid NPG content 95%wt.

[0037]4. The reaction product is separated by a cross-flow filter, the mass ratio of the circulating liquid and the clear liquid of the filter is controlled at 90, the circulating liquid containin...

Embodiment 3

[0039] A method for continuous production of neopentyl glycol, comprising the steps of:

[0040] 1. Formaldehyde, isobutyraldehyde and triethylamine are mixed into the reactor at a molar ratio of 1:0.9:0.02, and the condensation reaction is carried out at a temperature of 70°C and a pressure of 90kPa.

[0041] 2. Pass the resulting mixed solution into a tank containing Mg(OH) 2 The catalyst is condensed in a fixed-bed reactor, and the resulting solution containing 73% wtHPNE is passed into a storage tank.

[0042] 3. Use the feed pump to send the HPNE solution into the reflux reactor containing NPG, the catalyst is Raney nickel (the nickel content in the catalyst is 90%wt), and the hydrogenation reaction is carried out at 160 ° C and 7 MPa until the circulating liquid NPG content 93%wt.

[0043] 4. The reaction product is separated by a cross-flow filter, the mass ratio of the circulating liquid and the clear liquid of the filter is controlled at 50, the circulating liquid c...

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Abstract

The invention discloses a method for continuously producing neopentyl glycol. The method comprises the following steps: performing a condensation reaction on isobutyraldehyde and formaldehyde under the catalysis of tertiary alkylamine to obtain hydroxypivalaldehyde (HPA); condensing the HPA into a mixed hydroxylpivalic neopentyl glycol monoester (HPNE) liquid through a Tishchenko reaction under the action of an alkali catalyst in a fixed-bed reactor; continuously adding the synthesized mixed HPNE liquid into a loop reactor containing a hydrogenation catalyst and an NPG solution for a hydrogenation reaction, separating a reaction product by using a cross-flow filter, refluxing a circulating liquid containing the catalyst into the loop reactor, and rectifying a clear liquid to obtain the neopentyl glycol (NPG). According to the continuous production method of the neopentyl glycol, the HPA is basically converted into the more stable HPNE, cyclic hydrogenation is performed by using the loop reactor, and byproduct production is reduced, therefore, the product quality is improved and the product yield is increased; by the method, the stable operation of a continuous industrial productiontechnology and a continuous industrial production device of the neopentyl glycol can be guaranteed.

Description

technical field [0001] The invention relates to a production method for preparing neopentyl glycol, in particular to a method for continuous production of neopentyl glycol. Background technique [0002] Neopentyl glycol (NPG, 2,2-dimethyl-1,3-propanediol), as a diol, is an important raw material for the production of resins, powder coatings, plasticizers and lubricating oils, and has great economic significance. At present, disproportionation and condensation hydrogenation are widely used in industry to prepare neopentyl glycol. Among them, the condensation hydrogenation method is that formaldehyde and isobutyraldehyde are condensed under amine catalyst conditions to generate hydroxypivalaldehyde (HPA), and then hydroxypivalaldehyde is hydrogenated under the action of nickel-based, copper-based and other catalysts to obtain the final product neopentyl di alcohol. Aiming at this synthetic route, many achievements have been made in the development of high-efficiency catalyst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/20C07C29/149C07C67/44C07C69/675C07C45/75C07C47/19
CPCC07C29/149C07C45/75C07C67/44C07C47/19C07C69/675C07C31/20
Inventor 王海峰王延坤闫志广祝红广
Owner LIHUAYI GROUP CO LTD
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